Name Date Designation
Prepared
JF 05.07.13
Service Manual BB 150
Index Name Date
Document No. Page
File
50078923_04_CN 50 079 823 25/ 25
4.7.4 CO
2
METERING AND REGULATION CIRCUIT
Short description:
The replaceable, connector-compatible, thermal conductivity detector (TCD with
auto-zero or infrared (IR) sensor) is integrated in the sensor block. CO
2
regulation
is μP-based .
CO
2
gas input is metered by a solenoid. The gas flowrate is also restricted by a
capillary opening with a diameter of 0.7 mm, integrated in the valve block. Before
entering the unit, the gas passes through a sterile filter that can be accessed from
outside the unit for replacement.
Circuit diagram:
See circuit diagrams in Chapter 3.
Technical specifications:
Gas flowrate: ~ 5 l/min
Gas input pressure: 1 bar
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