Instruction Manual
D103557X012
Calibration
April 2016
42
Figure 4‐1. Relay A Adjustment (Shroud Removed for Clarity)
ADJUSTMENT DISC
FOR DOUBLE‐ACTING RELAYS:
ROTATE ADJUSTMENT DISC IN
THIS DIRECTION TO INCREASE
OUTPUT PRESSURE
FOR DOUBLE‐ACTING RELAYS:
ROTATE ADJUSTMENT DISC IN
THIS DIRECTION TO DECREASE
OUTPUT PRESSURE
FOR SINGLE‐ACTING DIRECT RELAYS:
ROTATE ADJUSTMENT DISC IN THIS
DIRECTION UNTIL IT CONTACTS THE
BEAM
LOW BLEED RELAY DOES
NOT HAVE BLEED HOLES
W9305
Relay A may also be adjusted for use in single‐acting‐ direct applications. Rotate the adjustment disc as shown in figure
4‐1 for single‐acting direct operation.
CAUTION
Care should be taken during relay adjustment as the adjustment disc may disengage if rotated too far.
Single‐Acting Relays
WARNING
If the unused port is monitoring pressure, ensure that the pressure source conforms to ISA Standard 7.0.01 and does not
exceed the pressure supplied to the instrument.
Failure to do so could result in personal injury or property damage caused by loss of process control.
Single‐Acting Direct Relay
The single‐acting direct relay is designated by “Relay C” on a label affixed to the relay itself. Relay C requires no
adjustment.
Single‐Acting Reverse Relay
The single‐acting reverse relay is designated by “Relay B” on a label affixed to the relay itself. Relay B is calibrated at the
factory and requires no further adjustment.
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