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Emerson Process Management GmbH & Co. OHG8-14
Instruction Manual
HASAxE-IM-HS
05/2006
8-4 Troubleshooting on Components
Measuring Point: X8
Measuring instrument: DVM
Signal: approx. 0 ± 500 mV DC
(at ambient temperature)
Failure: Signal not within stated range
Potential cause:
- IR measurement or paramagnetic
Oxygen measurement
a) sensor not connected
b) sensor defective
c) sensor cable broken
d) BKS board defective
- electrochemical Oxygen measurement:
a) sensor not connected
b) OXS board defective
c) BKS board defective
8-4-3-1-4 Temperature sensor
a) connect temperature sensor
b) replace OXS board
c) replace BKS board
8-4-3-1-3 Negative reference voltage
Measuring Point: X5, pin 4
Measuring instrument: DVM
Signal: inverse positive
reference voltage
Failure: Both reference voltages differ by
more than 10 mV
(U
ref. pos.
+ U
ref. neg.
< 10 mV) !
How to solve:
Replace BKS board
How to solve:
a) connect temperature sensor
b) replace temperature sensor
c) replace temperature sensor
d) replace BKS board