ABB SCK, Системное руководство

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130 System Manual SCK Gas Sampling System 42/23-81 EN Rev. 4
The electric heating of probe H is driven by a fixed voltage generated by the trans-
former installed in the control cabinet. Excessively long supply lines or incorrectly
chosen cross-sections of the supply lines can lead to massive voltage drops en
route to the gas sampling probe. This leads to reduced heating output and prob-
lems with probe operation.
Proceed as follows:
Step Procedure
1
Check voltage between Ground and the probe-side terminal con-
nections
(1) or (2) .
2
The following minimum values must be reached:
Probe length / m 1,5 2 2,5 3 3,5
Minimum voltage / V 24 26 26 28 30
If these values are not reached, the system must not be put into
operation in this set-up as adequate heating of the integrated metal
filter cannot be guaranteed and this may lead to condensation and
clogging of the probe.
Check the following possibilities for adequate supply:
 Lay larger cross-sections
 Reduce lengths of supply lines
Checking the probe H
heating power supply