Emerson ROSEMOUNT OCX 8800 - Manual (Page 38)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
2-18
Figure 2-10. Piping Arrangement,
Blowback with Autocalibration
38850004
Pressure regulator with 1/8” inlet port is factory
set for 35 or 45 psig. Regulator with 1/4” inlet port
is factory set for 55 psig. If regulators are not
installed in correct locations, the OCX 8800 will
not work.
Check Valve
Blowback Valve,
Air Operated
*Normally
Closed
Solenoid
Valve
Electronics
Housing
Eductor Air In
Sensor
Housing
Dilution Air In
Reference
Air In
Cal Gas Flow Meter
7 scfh, 20-30 psig
Recommended
Dilution
Air Flow Meter
0.1 scfh
Instrument
Air Supply
Pressure Regulator/Filter
35 psig - General Purpose
45 psig - Hazardous Area
(
(
CAL Gas Out
Instrument Air
Pressure
Regulator/Filter
55 psig
*Normally
Open
Solenoid
Valve
2-Stage
Regulators
CO
HI O
2
LO O
2
CAUTION
NOTE: Wall mount the air-operated blowback
valve on a suitable mounting plate.
*NOTE: During blowback operation, states of
both solenoid valves change.
Check
Valve
Tee - (3 x 1/4 in.
Tube Unions)
Vacuum
Gage