Watlow Calibrating Watlow Series 988 Family Process Controls - Manual (Page 10)

10
WATLOW Series 988 Calibration Manual
RTD
RTD Input Procedure
Equipment Required
•
1K

precision decade box with 0.01

resolution
Setup and Calibration
1. Connect the AC voltage L1, L2 and ground to the proper terminals on the
Series 988. See Chapter 2 in the user's manual.
2. For Input #1 calibration: Connect the decade box to terminals #8, 9
and 10 on the 988 terminal strip, see below. Use 20 to 24 gauge copper wire.
Remove the control from the case and set the Input 1 DIP switches to:
1 OFF
2 OFF 3 ON
For Input #2 calibration: Connect the decade box to terminal #18, 19 and 20
on the 988 terminal strip, see below. Use 20 to 24 gauge copper wire. If you
have model number 98_ _ - _2 _ _ - _ _ _ _, remove the control from the case
and set the Input 2 DIP switches to: 1
OFF 2 OFF 3 ON
NOTE:
Any prompt begin-
ning with an “A”
applies to Input 1.
Those beginning
with a “B” apply to
Input 2.
3. Apply power to the unit and let it warm up for 15 minutes. After warm up put
the unit in the CAL menu. See Page 6.
When performing calibration procedures, always do the Input 1 prompts
(beginning with an “A”) first, then continue on to the Input 2 prompts
(beginning with a “B”). See the Calibration menu on Page 6.
4. At the A 15 or B 15 prompt, enter 15.00

from the decade box to the Series
988. Allow at least 10 seconds to stabilize. Press the Up key to change the
upper display to YES. Press the Mode key.
5. At the A380 or B380 prompt, enter 380.00

from the decade box to the Series
988. Allow at least 10 seconds to stabilize. Press the Up key to change the
upper display to YES. Press the Mode key. To conclude the RTD calibration,
press the Display key.
H
L
G
Ω
General Radio Model #1433-T
To 8 or 18
To 9 or 19
To 10 or 20
Series 98X
Terminals