Analytical-industries GPR-1600 Series Trace PPB Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 50)

Advanced Instruments Inc.

Symptom Possible Cause Recommended Action

Erratic O

reading

No O

reading

Change in sample pressure

Dirty electrical contacts in upper section of

sensor housing

Corroded solder joints on sensor PCB from

corrosive sample or electrolyte leakage from

sensor

Corroded spring loaded contact in upper

section of sensor housing from liquid in

sample or electrolyte leakage from sensor

Liquid covering sensing area

Improper sensor selection

Presence of interference gases

Unauthorized maintenance

Sensor nearing end of life

Sensors without PCB use mV setting.

Calibrate the analyzer (calibrate at pressure and

temperature of sample)

Clean contacts with alcohol (minimize exposure time

of MS sensor to ambient air to extent possible)

Replace sensor and return sensor to the factory for

warranty determination

Upper section of sensor housing: Clean contacts

with alcohol, flow sample or zero gas for 2-3 hours

to flush sample system and sensor housing

Sensor: Replace if leaking and return it to the

factory for warranty determination

Wipe with alcohol and lint free towel or flow sample

or zero gas for 2-3 hours to flush

Replace GPR/PSR sensor with XLT sensor when CO

or acid gases are present. Consult factory.

Replace sensor and install scrubber

Consult factory.

Replace sensor

Erratic O

reading

Negative O

reading

No O

reading

accompanied by

electrolyte leakage

Pressurizing the sensor by flowing gas to the

sensor with the vent restricted or SHUT OFF

valve closed and suddenly removing the

restriction draws a vacuum on the sensor

partially opening the valves upstream of the

analyzer when using a pump downstream of

the analyzer to draw sample from a process at

atmospheric pressure or a slight vacuum.

Placing a vacuum on the sensor in excess 4”

of water column is strongly discouraged.

A premature adjustment of the ZERO OFFSET

potentiometer is a common problem

Zero the analyzer. If not successful replace the

sensor

Avoid drawing a vacuum on the sensor, a

pressurized sensor may not leak but still produce

negative readings.

From MAIN MENU select DEFAULT ZERO

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Analytical-industries GPR-1600 Series Trace PPB Oxygen Analyzer Manuel d'utilisateur Page 50

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