Teledyne Computer Monitor 460H User Manual

INSTRUCTION MANUAL  
MODEL 460H NEMA  
OZONE MONITOR  
© Teledyne Instruments  
Advanced Pollution Instrumentation Division  
(T-API)  
6565 Nancy Ridge Drive  
San Diego, CA 92121-2251  
TOLL-FREE: 800-324-5190  
TEL: 858-657-9800  
FAX: 858-657-9816  
03662  
Rev. D  
1/8/04  
 
TABLE OF CONTENTS  
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I.0 INTRODUCTION  
1.1 Preface  
Teledyne API is pleased that you have purchased the Model 460H NEMA. Included is a  
full one-year warranty (see Section 1.2) and we at Teledyne API will be pleased to  
provide you with any support required so that you may utilize our equipment to the  
fullest extent.  
The Model 460H is a microprocessor based high concentration ozone monitor for  
monitoring process streams in water treatment, food processing, and research  
applications. The Model 460H has been designed to give accurate and stable readings  
over long time periods with little or no maintenance or calibration.  
The flexibility of the software as well as the analog and digital I/O allow the Model 460H  
to interface with a broad range of devices for process control and data logging.  
We hope you will not experience any problems with the Teledyne API Model 460H but if  
you do, our full time customer service department is always available to answer your  
questions.  
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1.2 WARRANTY POLICY  
ADVANCED POLLUTION INSTRUMENTATION DIVISION  
02024c  
Prior to shipment, Teledyne API equipment is thoroughly inspected and tested. Should equipment  
failure occur, Teledyne API assures its customers that prompt service and support will be available.  
COVERAGE  
After the warranty period and throughout the equipment lifetime, Teledyne API stands ready to  
provide on-site or in-plant service at reasonable rates similar to those of other manufacturers in the  
industry. All maintenance and the first level of field troubleshooting are to be performed by the  
customer.  
NON- TELEDYNE API MANUFACTURED EQUIPMENT  
Equipment provided but not manufactured by Teledyne API is warranted and will be repaired to the  
extent and according to the current terms and conditions of the respective equipment manufacturers  
warranty.  
GENERAL  
Teledyne API warrants each Product manufactured by Teledyne API to be free from defects in  
material and workmanship under normal use and service for a period of one year from the date of  
delivery. All replacement parts and repairs are warranted for 90 days after the purchase.  
If a Product fails to conform to its specifications within the warranty period, Teledyne API shall  
correct such defect by, in Teledyne API's discretion, repairing or replacing such defective Product or  
refunding the purchase price of such Product.  
The warranties set forth in this section shall be of no force or effect with respect to any Product:  
(i) that has been altered or subjected to misuse, negligence or accident, or (ii) that has been used in  
any manner other than in accordance with the instruction provided by Teledyne API or (iii) not  
properly maintained.  
THE WARRANTIES SET FORTH IN THIS SECTION AND THE REMEDIES  
THEREFORE ARE EXCLUSIVE AND IN LIEU OF ANY IMPLIED WARRANTIES  
OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE OR OTHER  
WARRANTY OF QUALITY, WHETHER EXPRESSED OR IMPLIED.  
THE  
REMEDIES SET FORTH IN THIS SECTION ARE THE EXCLUSIVE REMEDIES  
FOR BREACH OF ANY WARRANTY CONTAINED HEREIN. TELEDYNE API  
SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL  
DAMAGES ARISING OUT OF OR RELATED TO THIS AGREEMENT OF  
TELEDYNE API'S PERFORMANCE HEREUNDER, WHETHER FOR BREACH OF  
WARRANTY OR OTHERWISE.  
TERMS AND CONDITIONS  
All units or components returned to API should be properly packed for handling and  
returned freight prepaid to the nearest designated Service Center. After the repair, the  
equipment will be returned, freight prepaid.  
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1.3 Principle of Operation  
The detection of ozone molecules is based on absorption of 254 nm UV light due to an  
internal electronic resonance of the O molecule. The Model 460H uses a mercury lamp  
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constructed so that a large majority of the light emitted is at the 254nm wavelength. Light  
from the lamp shines through an absorption cell through which the sample gas being  
measured is passed. The ratio of the intensity of light passing through the gas to a  
reference measurement which does not pass through the gas forms the ratio I/I . This  
o
ratio forms the basis for the calculation of the ozone concentration.  
The Beer-Lambert equation, shown below, calculates the concentration of ozone from the  
ratio of light intensities.  
106  
Τ
14.695psi  
Ι
Ιo  
CO = −  
×
×
× ln  
α × l 273o Κ  
Ρ
3
Where:  
I = Intensity of light passed through the sample  
Io = Intensity of light through sample free of ozone  
α = absorption coefficient  
l = path length  
CO = concentration of ozone in parts per million  
3
T = sample temperature in degrees Kelvin  
P = pressure in pounds per square inch (absolute)  
As can be seen the concentration of ozone depends on more than the intensity ratio.  
Temperature and pressure influence the density of the sample. The density of the gas  
changes the number of ozone molecules in the absorption cell which impacts the amount  
of light removed from the light beam. These effects are addressed by directly measuring  
temperature and pressure and including their actual values in the calculation. The  
absorption coefficient is a number that reflects the inherent ability of ozone to absorb 254  
-1  
-1  
nm light. Most current measurements place this value at 308 cm atm at STP. The  
value of this number reflects the fact that ozone is a very efficient absorber of UV  
radiation which is why stratospheric ozone protects the life forms lower in the  
atmosphere from the harmful effects from solar UV radiation. Lastly, the absorption path  
length determines how many molecules are present in the column of gas in the absorption  
cell.  
The intensity of light is converted into a voltage by the detector/preamp module. The  
voltage is converted into a number by a voltage-to-frequency (V/F) converter capable of  
80,000 count resolution. The digitized signal, along with the other variables, are used by  
the CPU to compute the concentration using the above formula.  
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1.4 Specifications  
Measurement Principle  
Ranges  
UV Absorption (Beer Lambert Law)  
0-5%, 0-10%, 0-15% w/w, 0-20% w/w  
0-100 g/Nm3, 0-200 g/Nm3, 0-300 g/Nm3, 0-  
400g/ Nm3  
Measurement Units  
Accuracy  
wt%, g/Nm3  
± 1% of Full Scale  
Precision/Repeatability  
Resolution  
Response Time (95%)  
Compensation  
±0.5% of Full Scale Range  
0.1 % w/w or .01 g/Nm3  
<5 sec to 95%  
Pressure, Temperature (NTP = 273.15K,  
760mmHg)  
Gas Inlet Pressure Range  
Gas Flow Rate  
Temperature Range  
Dimensions (H x W x D)  
3.0 – 30.0 psig  
0.2 – 2.0 LPM  
o
5-45 C  
12.64" x 11.19" x 6.08"  
(321mm x 284mm x 154mm)  
9.40lb (4.27kg)  
Weight  
Power  
110-240V~, 50/60Hz, 2.5A  
Installation Category (Overvoltage Category) II  
Pollution Degree 2  
Environmental Conditions  
Maximum Operating Altitude  
Analog Output Voltage  
Isolated Analog Output 4-20mA  
Mode*  
2000 meters  
0-5V, 4-20mA (Optional)  
Maximum voltage between outputs and ground  
60V peak  
Degree of Protection (IP Code)  
IPX65  
*Optional  
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2.0 Installation  
Upon receiving the Model 460H please verify that there is no apparent shipping damage.  
(If damage has occurred please advise shipper first, then Teledyne API.)  
2.1 Mechanical Installation  
1. Mount the enclosure securely to a vertical surface. Figure 2-1 below shows the  
locations of the four mounting holes. All four mounting holes should be used to  
secure the monitor.  
6.050 [153.67]  
10.700 [271.78]  
Figure 2-1 Mounting Hole Locations  
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2.2 Pneumatic Connections  
1. Connect a ¼” exhaust line to the fitting labeled ‘Exhaust.’ This line should be vented  
to an outside area, since the exhaust gas may still contain trace levels of ozone that may  
not be completely removed by the built-in the ozone scrubber.  
CAUTION  
Exhaust gas from the M460H may contain dangerous levels of  
ozone!  
2. Connect the ozone delivery line to the ¼” inlet fitting labeled “Ozone Inlet” on the  
bottom face of the enclosure (See Figure 2-2.) The ozone delivery should be  
regulated to no more than 30psig. All tubing used should be made of ozone resistant  
material such as PTFE(Teflon) or FEP. API can supply appropriate tubing for  
connecting the ozone supply line.  
3. Connect the oxygen or other zero gas source to the ¼” tube fitting labeled ‘Zero Gas  
Inlet.’ Zero Gas supply pressure should be regulated between 5 and 30 psig.  
4. The gas flow rate through the monitor should be established between 0.5 and 2.0  
L/min.  
OZONE INLET  
ZERO GAS INLET  
WARNING - DO NOT EXCEED  
30 PSIG GAS DELIVERY  
PRESSURE  
WARNING - DO NOT EXCEED  
30 PSIG GAS DELIVERY  
PRESSURE  
Figure 2-2 Pneumatic Connections  
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2.3AC Power Connection  
Connect AC power to the instrument. A hole is provided on the bottom face of the  
enclosure for installing a ½” conduit fitting for routing the electrical wiring into the  
instrument. In order to maintain the IP (NEMA4X) rating of the enclosure, an  
appropriate sealed conduit connector should be used. Figure 2-3 below shows the  
location of the three terminal connector for the AC power. It is recommended that if  
multi-strand wires are used to make the AC connections, the wire ends should first be  
“tinned” with solder to ensure that the screw terminals can make a reliable connection to  
the wires.  
CAUTION!  
Disconnect power to the AC mains before making any electrical  
connections to the Model 460H.  
IMPORTANT!  
A proper earth ground connection must be made to the receptacle  
labeled “Earth Ground” on the 3 pin AC connector. Failure to do  
so may result in a shock hazard and malfunction of the  
instrument.  
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I/O CONNECTOR  
EARTH GROUND  
AC LINE  
AC NEUTRAL  
AC POWER CONNECTOR  
Figure 2-3 Electrical Connections  
2.4 Electrical I/O Connections  
All user I/O connections are available on the 16 pin connector on the mainboard (See  
Figure 2-3 for location.) This connector can be unplugged from the header on the  
mainboard for easier access when wiring. To disconnect from mainboard, loosen the two  
retaining screws at either end of the connector.  
When connecting multi-strand wire to this connector, the wire ends should be “tinned”  
with solder to ensure a reliable connection. This is not necessary if solid-core wire is  
used.  
2.4.1 Analog Output  
The analog output is located on the two pins labeled ‘Analog Out +’ and ‘Analog Out –‘  
The analog output can be configured for voltage or current output. The standard output is  
a 0-5 volt output. The analog output can also be optionally configured for a 4-20mA  
Current output. Check the serial number tag on the instrument to determine Analog  
Output configuration.  
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2.4.2 Digital Status Outputs  
The M460H has four digital status outputs for indicating error and operational status  
conditions. These outputs are in the form of opto-isolated open-collector transistors.  
They can be used to drive status LED’s on a display panel or interface to a digital device  
such as a Programmable Logic Controller (PLC).  
Figure 2-4 shows the most common way of connecting the digital outputs to an external  
device such as PLC. Note: Most devices, such as PLC’s, have internal provision for  
limiting the current that the input will draw from an external device. When connecting to  
a unit that does not have this feature, external dropping resistors must be used to limit the  
current through the transistor output to 50mA or less.  
See Chapter 7 for details on using the Status Outputs for diagnosing sensor and system-  
level malfunctions.  
Table 2-1 below describes the function of the status outputs.  
Table 2-1 Digital Status Output Pins  
Label  
Name  
Sensor O.K.  
Invalid Reading  
Lamp Low  
Cell Dirty  
Auto-Zero Error  
Spare  
Operation  
Normally On  
Normally Off  
Normally Off  
Normally Off  
Normally Off  
Undefined  
STATUS OUT 1  
STATUS OUT 2  
STATUS OUT 3  
STATUS OUT 4  
STATUS OUT 5  
STATUS OUT 6  
STATUS COM  
Common Pin for  
all Status Outputs  
N/A  
Programmable Logic  
M454  
Controller or other device  
+5V  
Digital Output #1-4 (Collector)  
Digital  
Input  
Digital Output Common (Emmiter)  
Ground Provided  
by PLC  
Opto-Isolator  
Figure 2-4 Digital Output Connections  
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2.4.3 Control Inputs  
There are 2 digital control inputs on the I/O connector; they are labeled ‘Zero Input’ and  
‘Aux Input.’ The control inputs are used for remote control of the M460H by a device  
such as a PLC. These inputs are triggered by providing a contact closure or low  
impedance current path between the Input and the Gnd pin. This can be done by using a  
mechanical switch or isolated transistor type output from another device, such as a PLC.  
Never connect a voltage level output from another device to these contacts. The  
functions of the control inputs is summarized below in Table 2-2:  
Table 2-2 Control Inputs  
Input  
Zero Input  
Aux Input  
Description  
Zero Calibration  
Pressure Display  
Zero Calibration Input:  
The zero calibration input is used to initiate zero calibration from an external device.  
This input performs exactly the same function as the ‘Zero’ buttons on the front panel.  
Pressure Display Input:  
The pressure display input is used to display the pressure on the front panel. This input  
performs exactly the same function as the ‘Pressure’ buttons on the front panel.  
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2.4.4 RS232/RS485 Serial Communications Port  
A bi-directional RS232/485 Serial Port Interface is provided that can be used for data  
acquisition and instrument control. All that is required to use this interface is a computer  
with a serial communications port (COM port) and terminal software. Three pins are  
provided on the I/O connector for serial communications as shown in Table 2-3.  
Table 2-3 Serial Port Pins  
Label  
Description  
Serial Transmit (RS485 – A)  
Serial Receive (RS485 – B)  
Serial Ground (RS232 Only)  
SERIAL TX  
SERIAL RX  
SERIAL GND  
The Serial Port can be configured for either RS232 or RS485. The standard factory  
configuration is RS232. For direct connection to a PC or Laptop, RS232 should be used.  
For a permanent connection into a data acquisition system, RS485 is recommended  
because it has better noise immunity and is more reliable when communicating over  
longer distances. See Appendix A for details on changing the Serial Port configuration.  
Figure 2-5 below shows typical connections using RS232 and RS485. Note that the  
RS485 connection does not use the SERIAL GND pin.  
DB9-FEMALE  
SERIAL GND  
SERIAL RX  
SERIAL TX  
RS232  
SERIAL TX  
SERIAL RX  
RS485-A  
RS485-B  
RS485  
Figure 2-5 Typical RS232 and RS485 Connections  
See Chapter 5 for information on the Serial Communications protocol used by the  
M460H.  
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3.0 Startup  
Perform the following steps when fist installing the M460H ozone monitor or when  
bringing the monitor back into service.  
1. Turn on power to the monitor. The display will briefly display the “API” logo  
followed by the software version. The display will then begin showing ozone  
concentration.  
2. Establish a flow of zero gas to the monitor. Zero gas can be oxygen or clean, dry air.  
If monitor cannot be disconnected from an ozone generator, then establish flow  
through the generator and monitor with the generator turned off. Flow rate through  
monitor should be between 0.5 – 2.0 LPM (Liters per minute.)  
3. Let monitor warm up and purge for a minimum of 5 minutes. Zero the monitor by  
simultaneously pressing the Zero buttons on the front panel. The display should  
momentarily show dashes (‘----‘) after which the display should go quickly to zero.  
4. Check Status LED’s on front panel; Sensor OK led should be ON, all other LED’s  
should be OFF. If the Status LED’s are not in this state, refer to Chapter 7 for  
troubleshooting information.  
5. Observe the monitor for several more minutes at zero to ensure that it is stable.  
6. The monitor is now ready to measure ozone.  
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4.0 Operation  
The M460H has been designed for simple and trouble-free operation. The Sections  
below detail the operational features of the M460H.  
4.1 Front Panel Display  
4.1.1 O readout  
3
The current ozone concentration is displayed in the 4 digit readout in the center of the  
display. The concentration is displayed in the currently selected units, either wt% or  
g/Nm3.  
4.1.2 Pressure Display  
The pressure inside the measurement cell can be displayed on the readout by pressing and  
holding the ‘Pressure’ key on the front panel. The pressure is displayed in units of psia  
(pounds per square inch absolute.) The normal ambient pressure at sea level is about  
14.7psia. Ambient pressure at higher elevations will be somewhat less.  
The M460H can accurately measure ozone at cell pressures of 12 - 20psia. Care should  
be taken in setting up the monitor to avoid over-pressurizing the cell, as this will result in  
erroneous readings.  
4.1.3 Zero Calibration  
A Zero Calibration can be performed on the monitor at any time by simultaneously  
pressing the two ‘Zero’ buttons on the front panel. The monitor will briefly display  
dashes (‘----‘) after which the concentration should quickly go to zero.  
The Zero Calibration is calculated based on the current measurement in the cell; so care  
must be taken to ensure that all ozone is purged from the cell before pressing the ‘Zero’  
buttons.  
If the Auto-Zero option is not used, API recommends performing a manual Zero  
Calibration on the monitor once a week.  
4.1.4 Status LED’s  
The four status LED’s to the right of the display indicate the general status of the Model  
460H Monitor. During normal operation, after the monitor has warmed up, the green  
‘Sensor OK’ LED should be on and all other Status LED’s should be off. For  
information on troubleshooting using the Status LED’s, see Chapter 7.  
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4.2 Auto-Zero Operation  
The Auto-Zero feature allows the monitor to operate unattended for extended periods of  
time. This feature automatically performs a Zero Calibration at specific intervals (default  
interval is 12hrs.) The monitor does this by opening a solenoid valve to allow externally  
supplied Zero Gas to purge the monitor and then automatically performs a Zero  
Calibration.  
4.2.1 Auto-Zero Installation  
In order for this feature to function properly, external, pressurized zero gas must be  
supplied to the monitor as detailed in Section 2.2.  
4.2.2 Auto-Zero Function  
When the Auto-Zero function is triggered, the monitor performs the steps outlined in  
Table 4-1 below.  
Table 4-1 Auto-Zero Function  
Step Function  
Display Reads  
1
2
3
4
5
Switch Auto-Zero valve on  
N/A  
Purge cell for 20 seconds  
Perform Zero Calibration  
Switch Auto-Zero valve off  
Hold-Off for 3 sec to return  
Measurement Gas to cell  
Holds and Flashes Concentration Value  
Dashes: ‘----‘  
Dashes: ‘----‘  
Dashes: ‘----‘  
6
Return to Measurement Mode Normal Concentration Display  
4.2.3 Auto Zero Error  
When performing an Auto-Zero Calibration, the monitor checks to make sure the ozone  
concentration is near zero before calibration. If the ozone concentration is above 0.5wt%  
or 5.0 g/Nm3, the monitor will not perform the calibration and will display a “ZERO  
ERR” message on the display. The monitor will also turn on the Auto-Zero Error status  
signal (See Section 2.4.2 Digital Status Outputs.) This Status Signal will remain on until  
another Auto-Zero Calibration is successfully performed or a Manual Zero Calibration is  
performed.  
If an Auto-Zero error is detected, a manual Zero Calibration should be performed (See  
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5.0 Serial Communications  
The M460H comes equipped with a powerful digital Serial Communications Port that  
can be used for Data Acquisition and for changing instrument configuration. This port  
can be configured for either RS232 or RS485(half-duplex) operation. See Section 2.4.4  
for details on connecting the port to a computer or Data Acquisition system.  
5.1 Serial Port Configuration  
The Serial Port of the device being used to communicate with the M460H should be  
configured as follows:  
Table 5-1 Serial Port Configuration  
Parameter  
Baud Rate  
Data Bits  
Stop Bits  
Parity  
Value  
9600 bps  
8
1
None  
5.2 Command Syntax  
All characters sent and received are standard Ascii characters and all numbers are  
decimal numbers converted to Ascii text.  
All commands are sent using the following syntax:  
<address><command>:<data1>,<data2>#<checksum><CR>  
Where:  
address is the instrument address(default =1)  
command is the command string being sent  
: (colon) is the data separator and is only included if data is being sent as part of the  
command (See Command Details below to see if a command requires data or  
not)  
data1  
data2  
#
is the first data parameter, if required.  
is the second data parameter, if required.  
is the Checksum separator, sent only if optional checksum is included  
checksum is an Ascii checksum of all characters up to the # character. The checksum is  
optional, commands sent without the checksum(and checksum separator,) are  
also valid.  
CR  
is a carriage return, Ascii 13.  
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Examples of valid Commands with no data:  
Checksum Included:  
1O3#179<CR>  
No Checksum:  
1O3<CR>  
Examples of valid Commands with data:  
Checksum Included:  
1VSET:1,20#620<CR>  
No Checksum:  
1VSET:1,20<CR>  
5.3 Command Summary  
Table 5-2 below lists the commands available and a summary of their function.  
Table 5-2 Serial Port Command Summary  
Command  
CAUTO  
CZERO  
Description  
Perform an Auto-Zero Calibration (if option is installed)  
Perform a manual zero calibration (zero calibration is  
computed based on current O3 reading in cell)  
Analog Output Test Mode, Step Function  
Returns current O3 concentration  
Set communications address  
Returns a compact list of current measurement parameters  
Returns all current measurement parameters  
Get Single VAR value  
DACSTEP  
O3  
SETADDR  
TDUMP  
TLIST  
VGET  
VLIST  
VSET  
Lists all internal VARS  
Sets value of internal VAR  
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5.4 Command Reference  
5.4.1 CAUTO  
Syntax  
<address>CAUTO<CR>  
Description  
Perform an Auto-Zero Calibration. Valid only if Auto-Zero option is installed in  
monitor.  
Data Parameters Sent  
None  
Response  
<address>:<success_flag>#<checksum><CR>  
Example  
Command:  
1CAUTO<CR>  
Response:  
1:OK#261<CR>  
- Calibration Successful  
1:FAIL#391<CR> - Calibration Failed  
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5.4.2 CZERO  
Syntax  
<address>CZERO<CR>  
Description  
Perform a Zero Calibration. Note that calibration is performed based on concentration  
currently in measurement cell. Instrument should be sufficiently purged with zero gas  
before issuing this command.  
Data Parameters Sent  
None  
Response  
<address>:<success_flag>#<checksum><CR>  
Example  
Command:  
1CZERO<CR>  
Response:  
1:OK#261<CR>  
- Calibration Successful  
1:FAIL#391<CR> - Calibration Failed  
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5.4.3 DACSTEP  
Syntax  
<address>DACSTEP<CR>  
Description  
Puts instrument in the Analog Output setup mode. The Analog Output steps from zero to  
full-scale in 20% increments, pausing for 4 seconds at each level. This repeats 5 times,  
after which the instrument returns to normal operation. This mode is useful for testing  
the Analog Output and the operation of any equipment measuring the Analog Output.  
Data Parameters Sent  
None  
Response  
<address>:<success_flag>#<checksum><CR>  
Example  
Command:  
1DACSTEP<CR>  
Response:  
1:OK#261<CR>  
- Calibration Successful  
1:FAIL#391<CR> - Calibration Failed  
Notes  
Note that the DACSTEP function takes some time to complete. When the command is  
sent to the monitor, it will immediately respond with the <address> and colon ‘:’ as an  
acknowledgement that the message was received. After the function is complete the rest  
of the response will be sent. No additional commands should be issued to the monitor  
until the function completes.  
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5.4.4 O3  
Syntax  
<address>O3<CR>  
Description  
Returns the current ozone concentration measured by the monitor.  
Data Parameters Sent  
None  
Response  
<address>:<o3_conc>#<checksum><CR>  
Example  
Command:  
1O3<CR>  
Response:  
1:12.01898#518<CR>  
- Current O3 Concentration (reading 12.02 wt%)  
Notes  
Note that the concentration value returned shows more digits after the decimal than the  
front panel display. Concentration values should only be considered valid to 4 significant  
digits.  
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5.4.5 SETADDR  
Syntax  
<address>SETADDR:<new_address><CR>  
Description  
Changes the communications address to a new value.  
Data Parameters Sent  
new_address is the new address for the monitor; Range for new_address is 1-9.  
Response  
<address>:<success_flag>#<checksum><CR>  
Example  
Command:  
1SETADDR:2<CR> - Change address from 1 to 2  
Response:  
1:OK#261<CR>  
- Change Address Successful  
1:FAIL#391<CR> - Change Address Failed  
Notes  
Note that monitor response is from previous address, but any further commands must be  
at new address. In the example above, after sending back the OK response, the monitor  
will no longer respond to commands with address 1.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 27  
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5.4.6 TDUMP  
Syntax  
<address>TDUMP<CR>  
Description  
Returns the current measured parameters: O3 Concentration, Cell Pressure(psia,) Cell  
Temperature (K,) Lamp Temperature (K,) Measure Detector (mV,) Calibrated  
Refererence Detector (mV,) Reference Detector (mV)  
Data Parameters Sent  
None  
Response  
<address>:<o3_conc>,<pressure>,<cell_temp>,<lamp_temp>,<measure>,<cal_ref>,<ref  
erence>#<checksum><CR>  
Example  
Command:  
1TDUMP<CR>  
Response:  
1:0.0282144,14.77461,300.7179,324.7713,2881.437,2940.903,4412.52#3228  
<CR>  
Notes  
Note that the concentration value returned shows more digits after the decimal than the  
front panel display. Concentration values should only be considered valid to 4 significant  
digits.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 28  
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5.4.7 TLIST  
Syntax  
<address>TLIST<CR>  
Description  
Returns a verbose list of the current measured parameters with labels for each parameter:  
O3 Concentration, Cell Pressure(psia,) Cell Temperature (K,) Lamp Temperature (K,)  
Measure Detector (mV,) Calibrated Reference Detector (mV,) Reference Detector (mV)  
Data Parameters Sent  
None  
Response  
Test Parameter List (See Below)  
Example  
Command:  
1TLIST<CR>  
Response:  
O3 = 0.0226168  
Press = 14.7753  
Cell Temp = 300.7116  
Lamp Temp = 324.7965  
Ref = 2881.52  
Meas = 2941.092  
Raw Ref = 4412.646  
Notes  
Note that the concentration value returned shows more digits after the decimal than the  
front panel display. Concentration values should only be considered valid to 4 significant  
digits.  
Also, note that no checksum is sent in the response to the TLIST command.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 29  
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5.4.8 VGET  
Syntax  
<address>VGET:<var_index><CR>  
Description  
Returns value of an internal configuration variable (VAR.)  
Data Parameters Sent  
var_index  
is index number for internal VAR as follows:  
Var  
Index  
0
Name  
Description  
Allowable Range  
analog_range  
Full-Scale concentration  
range for Analog Output  
scaling  
5.0 – 400.0 (Units are  
current unit of measure,  
wt% or g/Nm3)  
0 = Off  
1
azero_enable  
Auto-Zero Enable VAR.  
(only valid if Auto-Zero  
hardware is installed)  
Period for Auto-Zero  
Calibration timer  
Mol weight of carrier gas  
for wt% calculations (32.0  
= O2)  
1 = On  
2
3
azero_period  
5.0 - 86400.0 Seconds  
27.0 – 32.0 mol weight  
carrier_weight  
4
5
comm_mode  
iir_filt  
Not Used  
Digital Concentration  
filter  
N/A  
0.05 – 1.0  
(1.0 = No Filtering, lower  
values increases filtering)  
6
conc_units  
O3 Concentration  
measurement units  
0 = wt%  
1 = g/Nm3  
Response  
<address>:<var_value>#<checksum><CR>  
Example  
Command:  
1VGET:0<CR>  
- Request analog_range value  
Response:  
1:15.0#303  
- analog_range returned as 15.0 (wt%)  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 30  
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5.4.9 VLIST  
Syntax  
<address>VLIST<CR>  
Description  
Returns a verbose list of an internal configuration variables (VARs.)  
Data Parameters Sent  
None  
Response  
Var List (See Below)  
Example  
Command:  
1VLIST<CR>  
Response:  
#0 analog_range = 15.0  
#1 azero_enable = 0.0  
#2 azero_period = 720.0  
#3 carrier_weight =32.0  
#4 comm_mode = 0.0  
#5 iir_filt = 0.4  
#6 conc_units = 0.0  
Notes  
Note that no checksum is sent in the response to the VLIST command.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 31  
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5.4.10 VSET  
Syntax  
<address>VSET:<var_index>,<new_value><CR>  
Description  
Sets value of an internal configuration variable (VAR.)  
Data Parameters Sent  
var_index  
new_value  
is index number for internal VAR (See VGET for index list)  
new value for VAR.  
Response  
<address>:<var_value>#<checksum><CR>  
Example  
Command:  
1VSET:0,15.0<CR> - Set analog_range VAR to 15.0 (wt%)  
Response:  
1:OK#261<CR>  
- VSET Successful  
- VSET Failed  
1:FAIL#391<CR>  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 32  
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6.0 Maintenance  
6.1 Replacing the gas filter element  
The Model 460H is equipped with a gas filter on the ozone inlet. These filters accept  
25mm diameter glass fiber elements. Only filter elements of borosilicate glass or quartz  
fibers should be used. When the instrument is first installed, the sample filters should be  
checked at least once a week for particulate loading and replaced if necessary. Once the  
replacement frequency is determined, a regular schedule for filter replacement should be  
instituted.  
For replacement 25mm filter elements, please contact API’s sales department and request  
part number 02851.  
Filter Replacement Procedure:  
1. First ensure that the gas delivery line is not under pressure and has been purged of  
ozone.  
2. Remove the four screws securing the gas filter assembly.  
3. Remove the bottom half of the filter housing  
4. Examine the internal sealing o-ring and replace if necessary.  
5. Pull out the stainless steel screen securing the filter element.  
6. The element can now be removed and replaced. When re-assembling filter, make  
sure that the top stainless steel screen is pushed into the filter cavity, securing the  
element in place.  
7. After re-assembly, the gas line should be pressurized with oxygen or dry air and  
checked for leaks using a bubble solution.  
6.2 Cleaning Exterior Surfaces of the M460H  
If necessary, the exterior surfaces of M454H can be cleaned with a damp cloth. Do not  
attempt to clean any of the other surfaces of the instrument. Do not submerge any part of  
the instrument in water or cleaning solution.  
6.3 Degree of Protection  
The Model 460NEMA has a water ingress rating of IPX65 which indicates that it can  
withstand strong jets of water and is totally protected against dust.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 33  
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7.0 Sensor and System Troubleshooting  
This chapter gives guidelines for diagnosing system and sensor malfunctions using the  
five digital Status Outputs provided by the M460H. All troubleshooting should be done  
after the M460H has been turned on and allowed to warm up for at least 15 minutes.  
7.1 Status Output Summary  
Table 7-1 below gives a summary of the operation of the five Status Outputs on the  
M454H. See 2.4.2 Digital Status Outputs for information on connecting these outputs.  
Table 7-1: Digital Status Outputs  
Output  
Name  
On State  
Off state  
#
1
Sensor O.K.  
Normal State  
Reference or  
Measure > 4995mV;  
Reference < 1000mV  
Normal State  
2
Invalid Reading  
Pressure > 45 psia,  
Negative Ozone  
Concentration,  
Concentration Over-  
Range  
3
4
5
Lamp Low  
Cell Dirty  
Reference  
Normal State  
Normal State  
Normal State  
Detector<2500mV  
Measure/Reference  
ratio < 0.5 (zero gas)  
Auto-Zero Failed  
Auto-Zero Error  
7.2 Sensor OK  
The normal state for the Sensor OK output in ON. During the warm-up period on start-  
up this output will stay off until the UV lamp reaches a minimum intensity. If this output  
remains off after the 15 minute warm-up period, or goes off during normal operation,  
then the M460H is in need of servicing.  
If the Sensor O.K. output turns off AND the Lamp Low output is on, this indicates that  
the lamp intensity has below the minimum level required for proper operation.  
If the Sensor O.K. output turns off and the Lamp Low output is also off, then one of the  
analog voltages in the sensor has exceeded the range of the internal A/D converter.  
Adjustment by qualified service personnel is required.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 34  
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7.3 Invalid Reading  
The normal state for the Invalid Reading output is OFF. If this output turns on, this  
indicates that the M460H is still operational, but a system fault or calibration fault exists  
that may make the current ozone reading invalid.  
The Invalid Reading output is turned on for any of the following conditions:  
1. When the measured pressure in the measurement cell exceeds 45 psia.  
2. When the measured concentration has exceeded the full-scale concentration  
range of the sensor. Check the serial number tag for the full-scale concentration  
range.  
3. The sensor is indicating an excessive negative reading.  
7.4 Lamp Low  
The normal state for the Lamp Low output is OFF. If this output turns on, this indicates  
that the UV lamp intensity as measured by the reference detector has dropped below  
2500mV.  
If the Lamp Low output turns ON and the Sensor O.K. output is ON, this indicates that  
the lamp intensity is still adequate for measurement, but adjustment should be made  
when possible.  
If the Lamp Low output turns ON and the Sensor O.K. output is OFF, this indicates a  
failure condition and measurement is no longer possible.  
7.5 Cell Dirty  
The normal state for the Cell Dirty output is OFF. If this output turns on, then the ratio  
of the measure detector to the reference detector (at zero) is < 0.5. This value is  
calculated when the zero calibration is performed.  
When this output is on, it indicates a loss of optical transmission through the windows in  
the absorption cell or a calibration fault.  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 35  
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7.6 Status Output Summary Table  
Table 7-2 below is a logic truth table summarizing the recommended actions based on the  
states of the four status outputs. A ‘1’ indicates the output is ON, a ‘0’ indicates the  
output is OFF, and ‘X’ indicates the output is in either state.  
Table 7-2: Status Output Truth Table  
Sensor  
OK  
1
Invalid  
Reading  
0
Lamp  
Low  
0
Cell  
Dirty  
0
Actions  
Normal operation, no action  
required  
0
1
X
1
X
X
X
X
Service required  
Check Pressure > 45 psia  
Verify that concentration has  
not exceeded full scale range  
of sensor.  
Calibrate at Zero.  
1
1
X
X
1
X
1
Lamp adjustment useful,  
though not required  
Calibrate at zero  
X
Clean Cell  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 36  
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Appendix A – Serial Port  
Configuration  
To configure the com port for RS232 or RS485, move the 4 shunts on JP3 of the  
Controller PCA (#03492) to the proper position as shown in Figure A-1.  
RS232  
RS485  
Figure A-1 RS232/RS485 Jumpers (Controller PCA#03492)  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 37  
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Appendix B – Pneumatic Diagram  
O3 Gas In  
Flow-Meter  
Filter  
Flow Control  
Orifice  
Azero Valve  
O3 Destruct  
O3  
Measurement  
Cell  
Zero Gas In  
Exhaust Out  
P/N 03662D Teledyne API Model 460H O Monitor Operator Manual - Page 38  
3
 

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