Instruction Manual
D200158X012
4194S Controllers
July 2018
9
Pressure Connections
WARNING
Overpressuring any system component, including the capsular sensing element, could result in personal injury or property
damage due to fire and explosion caused by venting or leakage of a hazardous supply pressure medium or process medium.
To avoid such injury or damage, provide suitable pressure‐ relieving or pressure‐limiting devices if supply pressure or
process pressure is capable of exceeding the maximum allowable pressures in tables 1-3 and 1-4.
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 figure 2-5. Supply, output, and vent connections are 1/4 NPT. Process pressure connections are 1/4 or 1/2 NPT
(optional).
Figure 2-5. Location of Connections
46A9765‐A
A3001
REMOTE SET POINT
CONNECTION
SUPPLY PRESSURE
CONTROLLER OUTPUT
PRESSURE
LOW
PRESSURE (A)
HIGH
PRESSURE (B)
VENT
TOP VIEW
BOTTOM VIEW
Process Pressure
Process pressure is piped to the connection marked A and B on the bottom of the case (see figure 2-5). The high
pressure line is piped to connection B, and the low pressure line connects to A.
When installing process piping, follow accepted practices to ensure accurate transmission of the process pressure to
the controller. Install shutoff valves, vents, drains, or seal systems as needed in the process pressure lines.
If the instrument is located such that the adjacent process pressure line will be approximately horizontal, the line
should slope downward to the instrument for liquid‐filled lines and upward toward the instrument for gas‐filled lines.
This will minimize the possibility of air becoming trapped in the sensor with liquid‐filled lines or of condensate
becoming trapped with gas‐filled lines. The recommended slope is 80 millimeters per meter (1 inch per foot).
