Installation
Manual CWD 2005
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Manual CWD2005.doc
4.5.2. Pressure Regulators
Good pressure regulation is very important for measurement stability. Four different
pressure regulators for different applications (and markets) are recommended as
options and short description is provided for each regulator in the following section.
The outlet pressures range
between 20 mbar and 55 mbar. (10”-24” H
2
O) depending
on type. Gas pressures higher than 6 bars (90 PSI) need a primary regulator to
reduce the pressure to the inlet of the pre-pressure regulator.
The standard analyzer consists of one process gas inlet and one calibration gas inlet
and both inlet ports require a pre-pressure regulator. All connectors are mm or inch.
Adjust the process gas and calibration gas regulator outlet pressures to read the
same pressure when gases are switched, this is important for measurement stability.
The first pre-pressure regulator < 6 bar (90 PSI) has a zinc die-cast body and internal
parts are made of steel and elastomers. Two control springs are available.
12 -
25 mbar. (10” H
2
O) orange
30 mbar
(20” H
2
O) blue.
Figure 11: Fisher 912 pre-pressure regulator < 6 bars (90 PSI).
1
Inlet ¼(6 mm) Gyrolok tube
2
Outlet ¼(6 mm) Gyrolok tube
3
Control spring
4
Vent
The next unit is a primary regulator < 250 bars (3600 PSI) type GO PR1 has a 316
SS body and gauges. The outlet (2) pressure is adjustable from 0
– 3.4 bar. A pre-
pressure regulator is still necessary and acts as a second stage inlet pressure control
for the CWD 2005.