Analytical-industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 29)

29

Symptom Possible Cause Recommended Action

O

2

reading doesn’t

agree to expected

O

2

values

Pressure and temperature of the sample

is different than span gas

Abnormality in gas

Calibrate the analyzer (calibrate at

pressure and temperature of sample)

Qualify the gas (use a portable analyzer)

Erratic O

2

reading

or

No O

2

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

2

or acid gases are present

Consult factory

Replace sensor and install scrubber

Replace sensor, obtain authorized service

Replace sensor

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