Watlow Series 965 - Manual (Page 31)

WATLOW Series 965 User's Manual 31 Appendix
T/C Calibration
NOTE:
Before calibration
on an installed
control, make sure
all data and
parameters are
documented. See
Setup and Operation
Tables, Pages 18
and 20.
NOTE:
When the MN LED is
on, the unit is
automatically
calibrating. Your
sequence is VERY
important. Always
move to the next
parameter before
changing the
calibration equip-
ment.
Thermocouple Field Calibration Procedure
Equipment Required
• Type "J" Reference Compensator with reference junction at 32
°
F/0
°
C, or
Type "J" Thermocouple Calibrator set at 32
°
F/0
°
C.
• Precision millivolt source, 0-50mV min. range, 0.01mV resolution
Setup And Calibration
1. Connect the AC line voltage L1 and L2 to the proper terminals.
2. Connect the millivolt source to Terminal 5 Negative and Terminal 3 Positive on the
Series 965 terminal strip. Use regular 20 - 24 gauge wire. Make sure the DIP switch
is set for thermocouple input, see Chapter 4.
3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the
unit in the CAL menu. See Figure 27 on Page 29. Select YEs.
4. Press the A/M key twice to enter the MANUAL mode. The unit is calibrating when
MN LED is on. Make sure the unit is in MANUAL mode only when you are in the
correct parameters.
5. At the 0.00 prompt, enter 0.00mV from the millivolt source to the control. Allow at
least 10 seconds to stabilize. Press the MODE key.
6. At the 50.0 prompt, enter 50.00mV from the millivolt source to the Series 965. Allow
at least 10 seconds to stabilize. Press the MODE key.
7. At the tC prompt, disconnect the millivolt source, and connect the reference
compensator or T/C calibrator to Terminal 5 Negative, and Terminal 3 Positive on the
Series 965 terminal strip. If using a compensator, turn on and short the input wires. If
using "J" calibrator, set to simulate 32
°
F/0
°
C. Allow 10 seconds for the control to
stabilize. The unit will leave the CAL mode if 1 minute passes between key
activations. To conclude the T/C calibration, advance the MODE key to the next
prompt or exit the CAL menu. Press the A/M key twice to exit the MANUAL mode.
RTD Field Calibration Procedure
Equipment Required
• 1K
Ω
precision decade resistance box with 0.01
Ω
resolution.
Setup And Calibration
1. Connect the ac line voltage L1 and L2 to the proper terminals.
2. Connect the decade resistance box to Terminal 2, 3 and 5 on the terminal strip. Use
regular 20 - 24 gauge wire of the same length and type. Make sure the DIP switch is
set for RTD input, see Chapter 4.
3. Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put
the unit in the CAL menu. See Figure 27 on Page 29. Select YEs. Press the MODE
key until the 440 prompt is displayed.
4. Press the A/M key twice to enter the MANUAL mode. The unit is calibrating when the
MN LED is on. Make sure the unit is in MANUAL mode only when you are in the
correct parameters.
5. At the 440 prompt, set the decade resistance box to 44.01. Allow at least 10 seconds
to stabilize. Press the MODE key to enter the calibration data. Press the A/M key
twice to exit the MANUAL mode. The unit will leave the CAL mode if 1 minute passes
between key activations. To conclude the RTD calibration, advance the MODE key
to the next prompt or exit the CAL menu.
6. At the 255 prompt, set the decade resistance box to 255.42. Allow at least 10
seconds to stabilize. Press the MODE key.