Analytical-industries GPR-1200 MS ATEX Portable PPB Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 27)

Symptom Possible Cause Recommended Action

Erratic O

reading

No O

reading

Test sensor independent from analyzer

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

Presence of sulfur gases

Unauthorized maintenance

Sensor nearing end of life

Remove sensor from housing. Using a volt-meter set

to uA output; apply the (+) lead to the outer ring of

the sensor PCB and the (-) lead to the center circle

to obtain the sensor’s output in air. Contact factory

with result.

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

Replace sensor, obtain authorized service

Replace sensor

Erratic O

reading

Negative O

reading

No O

readin

possibly

accompanied by

electrolyte leakage

Pressurizing the sensor by flowing gas to

the sensor with: the vent restricted

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.

A pressurized sensor may not leak but

still produce negative readings.

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.

Placing a vacuum on the sensor in excess 4” of

water column is strongly discouraged.

From MAIN MENU select DEFAULT ZERO

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Analytical-industries GPR-1200 MS ATEX Portable PPB Oxygen Analyzer Manuel d'utilisateur Page 27

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