Installation Instructions
Document No. 129-125
Rev. 5, June, 2000
RL 147 Positioning Relay Calibration
Page 1 of 5
Product Description
This sheet provides the instructions to calibrate the
RL 147 Positioning Relay after it has been mounted
on an actuator.
Product Number
147-2000
Required Tools
•
Medium flat-blade screwdriver
•
Tubing, pressure gauge, and squeeze bulb
(Part of Calibration kit 832-177)
•
Two 5/8-inch open end wrenches
•
Two 7/16-inch open end wrenches for valve
stems of 1/4-inch diameter
Expected Installation Time
10 Minutes
Prerequisites
•
For field installed relays, mount the
positioning relay on the actuator according
to the instructions that are packaged with
the mounting kit.
•
Check that you have the correct feedback
spring(s) attached.
−
If the positioning relay is mounted on a
valve, see
Tables 4 and 6.
−
If the stroke of the No. 6 damper
actuator has been adjusted, see
Table 1
.
Identify the desired operating span and the start
point pressure.
NOTE: In some cases, the actuator stem travel or
stroke is not identical to the nominal value
of the relay feedback spring. See
Calculating The Span Setting
to determine
the span setting on the feedback arm.
Installation
Setting the span (See Figure 1)
The positioning relay operating span can be set for
spans of 3 to 12 psig (21 to 83 kPa).
For spans of 3 through 10 psig (21 to 69 kPa)
1.
Check that the feedback spring is attached to
the spring guide in the hole across from the
span adjustment screw. This is identified as the
standard location in
Figure 1.
2. With a screwdriver, loosen the span adjustment
screw. Move the spring guide on the feedback
arm until the span adjustment tab is at the
desired span setting reference number.
NOTE:
The line to the left of the number is the
setting.
3.
Tighten the span adjustment screw.
4.
The feedback spring must be parallel to the
actuator shaft or valve stem. Use the open end
wrenches to loosen the hex nuts holding the
spring arm in position on the shaft or stem.
Align the feedback spring and tighten the hex
nuts.
5.
The feedback spring should have no slack or no
stretch in it. Adjust the wing nuts and
adjustment nut, if necessary.
