Watlow Series 97 - Manual (Page 74)

A . 1 2 ■ A p p e n d i x Wa t l o w S e r i e s 9 7
Thermocouple Input Procedure
Equipment
• Type J reference compensator with reference junction at 32°F/0°C, or type J
thermocouple calibrator to 32°F/0°C.
• Precision millivolt source, 0 to 50mV minimum range, 0.002mV resolution.
Input 1 Setup and Calibration
1. Connect the correct power supply to terminals 8 and 9 (see Chapter Three
and the Appendix).
2. Connect the millivolt source to terminals 6 (-) and 7 (+) with copper wire.
3. Enter 50.000mV from the millivolt source. Allow at least 10 seconds to
stabilize. Set Thermocouple Calibration, 50mV [tc50] (Input Calibration
Menu) to [`yES]. Press the Advance Key ‰ to store 50.000mV input and
move to the next prompt.
4. Enter 0.000mV from the millivolt source. Allow at least 10 seconds to
stabilize. Set Thermocouple Calibration, 0mV [tc00] (Input Calibration
Menu) to [`yES]. Press the Advance Key ‰ to store 0.000mV input and
move to the next prompt.
5. Disconnect the millivolt source and connect the reference compensator or
thermocouple calibrator to terminals 6 (-) and 7 (+). With type J
thermocouple wire, if using a compensator, turn it on and short the input
wires. When using a type J calibrator, set it to simulate 32°F/0°C. Allow 10
seconds for the controller to stabilize. Set Thermocouple Calibration, 32°
[tc32] (Input Calibration Menu) to [`yES]. Press the Advance Key ‰ to
store type J thermocouple calibration and move to the next prompt.
6. Rewire for operation and verify calibration.
RTD Input Procedure
Equipment Required
• 1k
Ω
decade box with 0.01
Ω
resolution.
Input 1 Setup and Calibration
1. Connect the correct power supply to terminals 8 and 9 (see Chapter Three
and the Appendix).
2. Short terminals 5, 6 and 7 together with less than 0.1
Ω
. Set Ground [`gnd]
(Input Calibration Menu) to [`yES]. Press the Advance Key ‰ to store
ground input and move to the next prompt.
2. Short terminals 5 and 7 together with less than 0.5
Ω
. Set Lead Resistance
Calibration [LEAd] (Input Calibration Menu) to [`yES]. Press the Advance
Key ‰ to store the lead resistance and move to the next prompt.
4. Connect the decade box to terminals 5 (S2), 6 (S3) and 7 (S1), with 20- to 24-
gauge wire.
5. Enter 15.00
Ω
from the decade box. Allow at least 10 seconds to stabilize. Set
RTD Calibration, 15
Ω
[r`15] (Input Calibration Menu) to [`yES]. Press
the Advance Key ‰ to store the 15.00
Ω
input and move to the next prompt.
6. Enter 380.00
Ω
from the decade box. Allow at least 10 seconds to stabilize.