Sensor Cleaning; Troubleshooting - WatchGas NEO User Manual

User Manual

9.2 SENSOR CLEANING

1. Disconnect the battery.
2. Unscrew the Sensor Cap and pull the sensor straight out, using a slight rocking
motion if necessary.
3. Put the sensor into a beaker and cover with pure methanol or ethanol.
4. Put the beaker into an ultrasonic cleaning bath and turn on for 5 minutes. Then
replace the alcohol with distilled water and turn on for 2 minutes. Lastly, take out sen-
sor and dry it. If possible, use a gentle stream of clean air to blow the residual liquid
out of the sensor.
5. Plug in the completely dried sensor and screw on the sensor cap.
6. Re-connect the battery
Always re-calibrate the PID after cleaning the sensor.

10. Troubleshooting

Problem
Cannot turn on power after
charging the battery
Reading abnormally High
Reading abnormally Low
Buzzer inoperative
Inlet flow too low
"Lamp" alarm on during operation Lamp drive circuit.
PC does not recognize instrument
NEO Photoionization Detector
Possible reasons
Defective battery
Dirty Filter
Dirty sensor module
Excessive moisture or water
condensation
Incorrect calibration
Dirty Filter
Dirty sensor module
Weak or dirty lamp
Incorrect calibration
Buzzer disabled
Bad buzzer
Pump diaphragm damaged or has
debris.
Flow path leaks.
Weak or defective PID Lamp.
Wrong cable
29
Solutions
Call WatchGas service center to replace
battery
Replace filter
Clean or replace sensor module
Blow-dry the sensor module
Calibrate the unit
Replace filter
Clean or replace sensor module
Clean or replace lamp
Calibrate the unit
Check that buzzer is not turned off
Call WatchGas service center
Call WatchGas service center
Check flow path for leaks; e.g., sensor
mo-dule O-ring, tube connectors, Teflon
tube compression fitting
Turn unit off and back on
Replace UV Lamp
Use WatchGas USB cable N / P M-011-3003-
W00
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