CALIBRATION CHECK
TheRP920 is factory calibrated.
If
the
controller does not
operate properly, check the calibration as follows,
OPERATING POINT (RP920A AND B)
1.
Pipe the connections (Fig. 5). Install Barb Fitting
14003755-001 in Port 8.
2.
Set the internal restriction to the blocked position.
Adjust the setpoint knob to 50 percent. On the
RP920B, adjust the compensation startpoint knob to
30 percent and set to negative compensation.
3.
Adjust the proportional band to 50 percent and set for
direct acting.
4.
If the BLP is 8 psi (55 kPa), go to Step 5. If
not, remove
the setpoint knob (Fig. 6) and turn the operating point
screw with a 5/64-inch Allen wrench until this value
is matched,
5.
Reinstall the self-tapping screw in Port 8.
Fig. 5. Connections for Operating Point Check-RP920A
and B.
OPERATING POINT SCREW
M O D U L E
KNOB
Fig. 6. Operating Point Screw Location.
OPERATING POINT AS MAXIMUM LIMIT
(RP920C and D)
1.
Pipe the connections (Fig. 7). Install Barb Fitting
14003755-001 in Port 8 and in the top of the integral
module. Connect the mainline to the integral module.
This procedure requires 20 psi (138 kPa) minimum
MLP_
2.
Adjust the setpoint to 50 percent. On the RP920D
adjust the compensation module to negative compen
sation and set the compensation startpoint to 30 per
cent.
3.
Adjust the proportional module to direct acting and
set the proportional band to 50 percent.
4.
Adjust the reset time to 15 minutes.
5.
If the BLP is 17.5 psi (120 kPa), go to Step 6. If not,
remove the setpoint knob and turn the operating point
screw with a 5/64-inch Allen wrench until this value
is matched.
6.
Reinstall the self-tapping screws in Port 8 and in the
top of the integral module.
Fig. 7. Connections for Operating Point Check (RP920C
and
SETPOINT
1.
Pipe the connections (Fig. 8). Install Barb Fitting
14003755-001 in Port 8.
2.
Apply MLP.
3.
Adjust the setpoint knob or screw until the gage
reading is 9 psi (62 kPa).
4,
The setpoint knob setting should be 50
percent. If
not, remove the setpoint knob and replace it oriented
to 50 percent.
5.
Reinstall the self tapping screw in Port 8.
85-0142
