Error In Co Metering And Regulation Circuit - Thermo Scientific BB 150 User Manual

4.7.5 ERROR IN CO
(Unit display)
Error
Test
code
equipment /
Test at the
unit
CO Gas: on LED
200
2
continuously lit.
CO Gas: off LED
201
2
always off.
CO display reads
204
2
99.9.
Name
Prepared
Index Name
50078923_04_CN
File
METERING AND REGULATION CIRCUIT
2
Inspections and tests
Check the initial gas
pressure.
Check the flow through the
sterile filter.
Perform the solenoid
functional test (FL 3).
Check the flow through the
solenoid.
Check the tubing to the
detector.
Initial gas pressure far too
high.
Perform the solenoid
functional test (FL 3).
Check the set value (against
the direction of regulation).
For TCD
Check the cross-
compensation (see Sec.
4.14.3)
Measure voltage P1/P2 or
P3/P4:
U=0 V or U=VCC (~5V),
detector defective.
U=2.0 - 2.5 V, thermistors
are OK.
Date
JF 05.07.13
Date
Possible corrective
actions
Adjust the correct initial
gas pressure.
Replace any defective
parts.
Replace the main
board as required.
Adjust the correct initial
gas pressure.
Replace any defective
parts.
Replace the main
board as required.
Remove excess gas.
Replace the measuring
cell, as required.
Designation
Service Manual BB 150
Document No.
50 079 823
Page
26/ 26