3-6 | Thermox TM 2000 Oxygen Analyzer
Special requirements if sample under vacuum
If your sample is under vacuum, the inlet sample negative-pressure limit
is 10 inches of water (vacuum). If sampling from a negative pressure, you
must enter this negative pressure value using the Setup/Process Pressure
menu option from the control unit front panel. This allows the software
to compensate for the cell outlet being at other than atmospheric pressure
(below atmospheric pressure because of the vacuum created). The same
concept applies if you restrict the outlet of the sensor, creating a positive
pressure on the outlet of the sensor. In general, as long as you vent the
sample to atmospheric pressure, you do not need to compensate for pres-
sure.
Plumbing options
If you ordered the factory-provided Remote Calibration Unit (RCU)
option, proceed to the “Clean Gas RCU Installation” section for help on
how to mount the RCU and plumb your sample and calibration gases to
the RCU and to the sensor. If you did not purchase the factory-provided
RCU, you must provide a way to switch between your sample gas and the
calibration gases.
Sensor mechanical setup - no sample bypass
Figure 3-3 shows the mechanical setup for the standard TM2000 sensor
without the sample bypass option. Figure 3-1 shows the location of the
sample inlet for the standard TM2000 sensor, which also serves as the inlet
for calibration gases. You can either insert a control valve that switches
between your sample and calibration gases, or you can manually switch
tubing. If using a valve and measuring in the low PPM ranges, use a pack-
less valve - it will prevent leaks that could affect readings.
Sensor mechanical setup - sample bypass
Figure 3-4 shows the mechanical setup for the TM2000 sensor with the
sample bypass option. See Figure 3-2 for the location of the sample inlet
with this sample bypass option installed. You can either insert a control
valve that switches between your sample and calibration gases, or you can
manually switch tubing. If using a valve and measuring in the low PPM
ranges, use a packless valve - it will prevent leaks that could affect read-
ings.
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