Establishing A Gas Flow Through The Oxygen Cell - GE moisture.iq User Manual

Chapter 1. Installation

1.10 Establishing a Gas Flow Through the Oxygen Cell

CAUTION! Establish a gas sample flow through the Delta F Oxygen Cell before you power up the
system or damage may occur to the oxygen cell.
Note: If you are not using a Delta F Oxygen Cell in your system, skip this section and proceed to the following
chapters to configure your system.
The Delta F Oxygen Cell requires a gas flow rate of 2 to 2.5 SCFH through the cell. The oxygen cell inlet pressure
should be between 0.2 and 1.0 psig. Refer to Figure 22 on page 27 when establishing a gas sample flow.
CAUTION! 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 moisture.IQ is in operation. If
exposure is unavoidable, either disconnect the oxygen cell from the moisture.IQ or equip the sample
system with a valve that allows the cell to be switched to a purge gas.
1. Close the flow control valve and adjust the upstream pressure as required. BHGE recommends a
pressure of about 2 to 10 psig pressure upstream from the flow control valve, depending on what type
of valve is installed in the sample system.
2. To safeguard against over pressurizing the oxygen cell, install a relief valve rated at 10 psig in the gas
flow system. There should be no restrictions downstream from the oxygen cell. Use 1/4 inch tubing or
larger on the oxygen cell outlet and the relief valve outlet. Both outlets should vent to atmosphere if
possible.
CAUTION! Do not connect the relief valve and oxygen cell outlets 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.
26 moisture.IQ User's Manual