Analytical-industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 30)

Symptom Possible Cause Recommended Action

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 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

A pressurized sensor may not

leak but still produce negative

readings.

Placing a vacuum on the sensor

in excess 4” of water column is

strongly discouraged. The front

sensing membrane is .000625

thick, heat sealed to the sensor

body and subject to tearing

when vacuum is suddenly

applied.

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

From MAIN MENU select DEFAULT ZERO

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Analytical-industries GPR-1100 ATEX Portable Trace PPM Oxygen Analyzer Manuel d'utilisateur Page 30

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