Single-Acting Relays - Fisher FIELDVUE DVC6200 Instruction Manual

Calibration
February 2017
Figure 4‐1. Relay A Adjustment (Shroud Removed for Clarity)
ADJUSTMENT DISC
W9034
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
For Instrument Level ODV only:
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.
44
FOR SINGLE‐ACTING DIRECT
RELAYS: ROTATE ADJUSTMENT
DISC IN THIS DIRECTION UNTIL IT
CONTACTS THE BEAM
FOR DOUBLE‐ACTING RELAYS:
ROTATE ADJUSTMENT DISC IN
THIS DIRECTION TO DECREASE
OUTPUT PRESSURE
FOR DOUBLE‐ACTING RELAYS:
ROTATE ADJUSTMENT DISC IN
THIS DIRECTION TO INCREASE
OUTPUT PRESSURE
Instruction Manual
D103605X012