Ametek Thermox CEM O2/TM, User Manual

Page: 29 / 168

Installation
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3-7
Do the following to plumb the RCU (see Figure 3-4):
1. Connect the zero gas to the zero gas inlet on the RCU.
2. Connect the span gas to the span gas inlet on the RCU.
3. Connect tubing between the calibration gas outlet on the RCU and the
control valve used to switch between the process gas and your calibra-
tion gases.
Figure 3-5 provides a flow diagram for the RCU setup.
Figure 3-5.
RCU flow diagram.
Figure 3-4.
RCU calibration
gas connections.
Instrument air inlet
1/4"NPT(F)
Zero gas inlet
1/8"NPT (F)
regulated to
10 psi by
RCU - LEFT SIDE
Calibration gas outlet
(to sensor cal
gas inlet)
1/8"NPT(F)
Purge Air Inlet
1/4"NPT (F) 30-100PSI
Purge Air Regular
(Set @ 10 psig)
Purge Air Flowmeter
(Set in accordance
with Warning tag on
enclosure)
customer
15-30 psi
Calibration
Gas
Zero
Regulator
a minimum
kept to
To be
Gas
Calibration
1/4" OD
Calibration
Valve
Solenoid
Valve
Solenoid
Flowmeter
Gas line
O2 span gas
Remote Calibration
Box
CEM O2
Sensor
Sample Gas
Process/Cal
Control Valve