GE Moisture Image Series 1 Startup Manual page 42

Establishing a Gas
Flow Through the
Oxygen Cell
Installation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Establish a gas sample flow before you power up or
damage may occur to the oxygen cell.
If you are using an oxygen cell, you must establish a gas flow through
the cell before powering up. If you are not using an oxygen cell,
proceed to Chapter 2, Initial Setup.
The oxygen cell requires a flow rate of 2 to 2.5 SCFH through the
cell. Oxygen cell inlet pressure should be between 0.2 and 1.0 PSIG.
Refer to Figure 1-21 on page 1-34 when establishing a gas sample
flow.
Do not operate the Delta F oxygen cell for extended
periods of time at oxygen concentrations that are over
range. Trace and low percent range sensors may be
damaged if exposed to high levels of oxygen, such as
air, for long periods (>1 hour) while the Series 1 is on. If
exposure is unavoidable, either disconnect the oxygen
cell from the Series 1 or equip the sample system with a
valve that allows the cell to be switched to purge gas.
Close the flow control valve and adjust the upstream pressure as
required. We recommend about 2 to 10 PSIG upstream of the flow
control valve, depending on which valve is installed in the sample
system.
To safeguard against over pressurizing the oxygen cell, install a relief
valve rated at 10 PSIG into the gas flow system. If the pressure
exceeds 10 PSIG, the relief valve will open; therefore, there should be
no restrictions downstream of the oxygen cell. Use 1/4 inch tubing or
larger on the oxygen cell outlet and relief valve outlet. Both outlets
should vent to atmosphere if possible.
Do not tie the relief valve and oxygen cell outlet to a
common outlet line smaller than 1/4 inch. This pressure
restriction will damage the oxygen cell. In addition, a
relief valve should be installed in the oxygen sample
system. If either of these conditions are not met, the
Delta F Oxygen Cell warranty will be voided.
Caution!
Caution!
Caution!
April 2004
1-33