Teledyne 3000TA-XLEU - Trace oxygen analyzer - Manual (Page 104)

Appendix 3000TA-XL-EU
Teledyne Analytical Instruments 88
damage may occur. For cell pressures above atmospheric, caution must
be exercised to avoid over pressuring the cell holder.
FLOW CONTROL VALVE:
All 3000XL series analyzers have a flow control device. This
device is a needle valve, and serves two functions in the sample path:
1. It limits the flow rate of the sample through the analyzer. The
needle valve is chosen to operate over a specific range of
pressures and provide a useable flow rate over that range.
2. The needle valve provides a pressure drop. This device is
selected to provide the only significant pressure drop in the
sample path.
BYPASS:
To improve the system response, a bypass can be added to increase
the sample flow rate to the analyzer by a factor of ten. A by-pass
provides a sample flow path around the analyzer of 2 - 18 SCFH
typically.
CONVERSIONS:
1 PSI = 2.04 INCHES OF MERCURY (in. Hg.)
1 SCFH = 0.476 SLPM