The OMD-625 can accept either a TO2-133 or TO2-233 (CO2 Applications - Natural Gas) oxygen sensor for
trace oxygen analysis. For Percent measurement, the OMD-625 can accept either a PO2-160 or PO2-24
(CO2 Applications - Natural Gas) oxygen sensor. For help selecting a sensor, contact your local sales rep
or the factory.
Prior to installing the sensor, it is important to make sure that the analyzer gas lines are hooked up and
the unit is ready to purge with a zero or process gas. Connect the zero gas line and set your flow be
-
tween 0.25 - 2.0 SCFH.
To Install the Sensor:
- Open up the square enclosure which will give you access to the sensor housing.
- Remove the cell holder cap by unscrewing the stainless steel collar.
- Lift up on the top of the sensor housing and set to the side.
- Inspect O’ring for cracking, replace if necessary. Always lube your O’rings!
- Remove the sensor from its box. With scissors, open nitrogen purged packaging
and remove the sensor.
- Visually inspect sensor for damage, if damaged notify the factory immediately.
- Remove the shorting tab across the back of the sensor circuit board (red tape).
- Place the sensor inside the housing with the metal screen mesh facing down and
the circuit board contacts facing up.
- Return upper portion of the sensor housing to the stainless steel bottom. Tighten
collar. Hand tight is acceptable to create an airtight seal.
- Immediately start purge of zero gas.
- If the analyzer has not been calibrating, refer to section 4.1 for more information.
** Sensor should be exposed to ambient air for no more than 2 minutes. Extended periods of exposure
can damage the low end sensitivity and response time.
CAUTION: Prior to installing the oxygen sensor. Read section 4.1 on performing a
span calibration.
Oxygen Sensor Front and Rear View
Gas Connections are made via 1/4” Compression Tube Fittings. The gas connections are located below
the sample system on the bottom right. Sample connection is designed for your process gas. Span con
-
nection is designed if you are using a certified bottle of calibration gas (optional). Vent is the outlet, typi
-
cally designed to vent to atmosphere, a flare stack or per your local regulations.
Designed, Tested and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
2.4
Gas Connections
Installation
OMD-625 Oxygen Analyzer
2.5
Installing the Oxygen Sensor
