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4194HA, HB, HC Controllers
July 2018
Section 2
2‐2‐
Installation, Mounting, and Connections
WARNING
To avoid personal injury or property damage resulting from the sudden release of pressure:
D Always wear protective clothing, gloves, and eyewear when performing any installation operations.
D Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and
preventive measures are not taken. Preventive measures may include, but are not limited to, one or more of the
following: Remote venting of the unit, re‐evaluating the hazardous area classification, ensuring adequate ventilation,
and the removal of any ignition sources. For information on remote venting of this controller, refer to page 11.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
D If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section of this
instruction manual.
Controller Mounting Orientation
Mount the controller with the housing vertical, as shown in figure 2‐1, so the vent points down.
Pipestand Mounting
A 4194H controller mounts on a pipestand. Install with the vent opening facing down. Secure the mounting coupling
to the pipestand by three set screws as shown in figure 2‐1.
Pressure Connections
WARNING
To avoid personal injury or property damage resulting from the sudden release of pressure, do not install any system
component, including the differential pressure unit, where service conditions could exceed the limits given in this manual.
Use pressure‐relieving devices as required by government or accepted industry codes and good engineering practices.
CAUTION
Do not use sealing tape on pneumatic connections. This instrument contains small passages that may become obstructed
by detached sealing tape. Thread sealant paste should be used to seal and lubricate pneumatic threaded connections.
Refer to figures 2‐1, 2‐2, and 2‐3 for the location of all input and output connections for the controller and differential
pressure unit. Also, refer to the differential pressure unit instruction manual for specific information about
connections and piping.
Supply, output, vent, and remote set point connections are 1/4 NPT. Use 1/4 or 3/8‐inch pipe or tubing for supply,
output, vent, and remote set point piping.
8
Instruction Manual
D200156X012
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