Instruction Manual

Instruction Manual

D103557X012

Calibration

January 2015

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.