Figure 2-14: Pneumatic installation, Rosemount OCX8800 with reference air
set, solenoids, and autocalibration, with COe zero function
A. Sensor housing
B. Eductor air in
C. Electronics housing
D. Reference air in
E. Dilution air in
F. Dilution air flow meter, 0.1 scfh
G. Instrument air
H. Calibration gas flow meter (7 scfh, 20 to 30 psig [1.3 to 2.1 barg] recommended)
I. Two-stage regulators
J. Instrument air supply
K. Pressure regulator/filter
• General purpose: 35 psig (2.4 barg)
• Hazardous area: 45 psig (3.1 barg)
L. Calibration gas out
M. Check valve
N. Actuating air
O. Normally open solenoid valve
(1)
P. Normally closed solenoid valve
(1)
Q. Blowback valve, air operated
R. 2-in. pressure gauge, 0 to 60 psig (0 to 4.1 barg)
S. Combination filter/regulator, 0 to 60 psig (0 to 4.1 barg)
T. Flow meter, 1-10 scfh
(1)
During blowback operation, states of both solenoid valves change.
Manual Install
00809-0500-4880 December 2022
Rosemount OCX8800A 51
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