Analytical-industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer Manuel d'utilisateur télécharger pdf (Page 32)

Advanced Instruments, Inc.

32

Symptom

Possible Cause

Recommended Action

Response time slow

Air leak, dead legs, distance

of sample line, low flow rate,

high volume of optional filters

and scrubbers

Leak test entire sample system, reduce

dead volume or increase flow rate

H

2

S reading doesn’t

agree to expected

values

Pressure and temperature of

the sample is different than

span gas

Error in calibration

Abnormality in gas

Calibrate the transmitter (calibrate at

pressure and temperature similar to that of

sample)

Repeat calibration

Qualify the integrity of the sample gas (use

a portable analyzer as a secondary check)

Erratic H

2

Sreading

or

No H

2

S reading

Sudden Changes in sample

pressure

Loose sensor cable and or

sensor PCB

Incorrect polarity of ribbon

cable

Corroded sensor PCB

Liquid covering sensing area

Sensor nearing end of life

Calibrate the transmitter (calibrate at

pressure and temperature similar to that of

sample)

Maintain sample pressure to within

recommended range

Secure ribbon cable firmly by fully inserting

the ribbon cable into its mating socket on

the sensor PCB

Ensure that sensor PCB is firmly secured

on sensor

Ensure that the conductors of ribbon cable

align with COND on sensor PCB

Replace sensor PCB

Replace sensor

.

Replace sensor

Cannot span

calibrate

Cannot zero

calibrate

Incorrect span gas

Span gas pressure too high

Span flow rate too high

Incorrect sensor

Sensor nearing end of life

Zero offset outside of

recommended range

High sample/zero gas flow

causing back pressure on

sensor

Defective sensor

Check span gas with a secondary analyzer

Set span gas pressure within

recommended range

Set flow rate within recommended range

Replace sensor

Allow enough time for sensor to settle with

zero gas

Set sample/zero gas flow within

recommended range

Replace sensor

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