Sensor Cleaning; Sampling Pump - WatchGas NEO User Manual

7.2 SENSOR CLEANING

1. Unscrew the sensor cap.
2. Pull the sensor straight out, using a slight rocking
motion if necessary.
3. Put the sensor into a beaker and cover it with pure
methanol or ethanol.
4. Put the beaker into an ultrasonic cleaning bath
and sonicate for 5 minutes. Then replace the alcohol
with distilled water and sonicate for 2 minutes. Lastly,
take out sensor and dry it. If possible, use a gentle
stream of clean air to blow the residual liquid out of
the sensor.
Note: Always re-calibrate the PID after cleaning the sensor.

7.3 SAMPLING PUMP

The flow rate should be roughly 250-350 cc/min at low pump speed and 350-450 cc/
min at high pump speed when there is no air leakage. When approaching the end of its
useful operating life, the pump will consume more energy and draw significantly lower
flow. Also, if excessive dust or particles enter the pump, the flow will be reduced. A strong
pump should stall and/or nearly stop when a finger is used to block the inlet. If the pump
does not stall but the flow is weak, it is likely that particles are trapped in the pump
diaphragm. When this occurs, it is necessary to replace or rebuild the pump, or clean the
diaphragm. Repair of the pump requires removal of the circuit board and is preferably
done by an authorized service center.
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