Emerson OCX 8800 Instruction Manual download pdf (Page 37)

Instruction Manual

IM-106-880 Original Issue

February 2005

OCX 8800

2-19

Figure 2-11. Piping Arrangement,

Blowback without Autocalibration

37390005

Check Valve

Blowback Valve,

Air Operated

*Normally

Closed

Solenoid

Valve

*NOTE: During blowback operation, states of

both solenoid valves change.

Electronics

Housing

Eductor Air In

Sensor

Housing

Dilution Air In

Reference Air In

CAL Gas 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

(

2-Stage

Regulators

HI O

LO O

Instrument Air

Pressure

Regulator/Filter

55 psig

*Normally

Open

Solenoid

Valve

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.

(

NOTE: Wall mount the air-operated blowback

valve on a suitable mounting plate.

CAUTION

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Emerson OCX 8800 Instruction Manual Page 37

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