Installation - Honeywell 7866 Operation And Maintenance Manual

Appendix A 7872 Gas Sampling Panel
9.3

Installation

1
See Figure 9-1 for mounting dimensions of the Gas Sampling Panel. Mount the Analyzer after
mounting the Gas Sampling Panel. The three stainless steel tubing connections made to the bottom
of the analyzer housing must not be overly tightened. The seal is made by an O-ring in each
analyzer fitting that grips the OD of the stainless steel tubing. If the fittings are too tight, O-ring
damage may occur.
2
All panel connections along the right side are 1/4 OD tube compression fittings. These connections
along the right side are 1/4 OD tube compression fittings. These connections can be tightened one
and one quarter turn to affect a seal upon installation of sample, calibration gas and vent-lines.
3
The bypass valve is included to prevent pressure build-up in the sensor housing. The bypass valve
is preset at 5 psig. During normal panel operation, the bypass valve remains closed and the bypass
flowmeter indicates no flow. If the bypass flowmeter indicates flow, check for clocked sample vent
and/or abnormally high pressure setting on sample regulator or calibration gases. (If the bypass
valve is to be replaced, note flow direction arrow stamped on valve body.)
4
The reference air regulator and sample regulator should be set at a pressure sufficient to allow
control of flow using the flowmeter valves (REF. AIR FLOW, CO
flowmeter settings should be approximately 2 SCFH.
5
Before adjusting the Ref. Air Regulator or Sample Regulator, unlock the adjustment knob by
pulling up on the yellow lock ring. After adjustment is made, push down on the lock ring to
maintain the setting. For 7866 explosion-proof applications, set regulator pressure no higher
than 2 psig
The four-way selector valve is used to select from ZERO gas, SPAN gas or SAMPLE gas inlets.
The outlet of the four-way valve feeds into the three-way selector valve. The three-way valve is
used to direct the gas flow to either the CO
sample or calibration gases contain a high content of H
flow to the H
consumption of pure H
76 7866 Triple Range Digital H
flowmeter for accurate flow determination. This will avoid unnecessary
2
gas.
2
and CO Analyzer/Indicator - Operation and Maintenance
2 2
/AIR FLOW, H
2
/AIR Flowmeter or the H
2
, adjust the 3-way selector valve to direct
2
FLOW). The
2
Flowmeter. Whenever
2
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