Adjustments - Co; -Metering And Regulation Circuit - Thermo Scientific BB 150 User Manual

4.12.2 PERFORMING ADJUSTMENTS CO
CIRCUIT
The following steps can be performed for units equipped with either a thermal
conductivity or an infrared detector.
In general, a comparative measurement should be made, unless the actual value is
known, e.g., CO display deviation at 0.0 % CO
2
Adjustment routine activation: Refer to the example in the operating instructions
(Chapter 6: Switch Function, Manual Zero-point Adjustment of the CO
System)
Comparative
measurement:
Perform the comparative measurement at the user's normal CO
5.0 %. Make sure the unit has adequate time to reach equilibrium before taking a
reading:
- For test addition: No sooner than 45 min. after all regulating circuits have reached
- For units at
operating temp.,
with gas, stable
humidity:
Comparative measurement
procedure:
Extract three gas samples through the metering opening in the gas
diaphragm/glass door.
Read and average the values, then compare with the displayed value.
Deviation:
Name
Prepared
Index Name
50078923_04_CN
File
Performing adjustments:
CO regulating circuit
2
equilibrium.
The measurement can be made immediately.
< ± 0.5 % CO
2
> ± 0.5 % CO
2
Date
JF 05.07.13
Date
METERING AND REGULATION
2
.
2
(Portable IR meter or hand pump w. sample
tube 0..10 % CO )
2
No adjustment necessary.
Refer to Section 10.6 of the operating
instructions.
Service Manual BB 150
Metering
2
concentration, e.g.,
2
Designation
Document No.
50 079 823
Page
35/ 35