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Emerson Process Management GmbH & Co. OHG8-16
Instruction Manual
HASAxE-IM-HS
05/2006
8-4 Troubleshooting on Components
8-4-3-1-6 Analog Preamplifier
a) Paramagnetic Oxygen Measurement
Measuring Point: X 25 (channel 1)
Measuring instrument: DVM
Signal when connected to
zero gas: 0 V dc (± 50 mV)
ambient air (approx. 21 Vol. - % O
2
):
100 % O2 sensor: approx. 840 mV
25 % O2 sensor: approx. 3.36 V
(Type of sensor: see separate nameplate label)
Failure: No signal or wrong measuring values
Potential cause:
a) Oxygen sensor not connected
b) Oxygen sensor defective
c) BKS board defective
How to solve:
a) Connect Oxygen sensor
b) Replace Oxygen sensor
c) Replace BKS board
b) IR Measurement
Measuring Point:
X 25 (channel 1; not for instruments with
Oxygen measurement)
X 27 (channel 2)
Measuring instrument: DVM
Signal when connected to
zero gas: 0 V dc (± 100 mV)
Zero point voltage and span voltage must differ
at least by 600 mV (at ranges < 1000 ppm
difference should be 500 mV min.)
Failure: No signal or wrong measuring values
Potential cause:
a) Detector not connected
b) Detector defective
c) BKS board defective
How to solve:
a) Connect detector
b) Replace detector
c) Replace BKS board