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2472 DI HEATER OPERATION / MAINTENANCE MANUAL
PAGE 29
Install a reference temperature sensor (i.e. NIST traceable) into a
fitting within a meter of the heater outlet.
Allow flow through the plumbing connections to the heater.
Control the DI water flow through the heater at 15 lpm.
Turn heater on and engage the heaters.
Set the heater temperature controller to 70
C and allow 15 minutes to
fully reach a steady state temperature.
Compare the DI water temperature at the reference sensor to the
temperature controller process value.
If the temperatures are within 1
C then no recalibration is required. If a
deviation exists between the temperatures, carefully follow the
procedures below to change the thermocouple calibration in the
temperature controller. The input sensor calibration parameter should be
adjusted to match the process value on the temperature controller to the
reference sensor temperature.
1. Method to changing input sensor calibration (Watlow Controller)
a. Unlocking the Watlow
Press both the Advance key (
) and Home key (
) for at
least 6 seconds until the “Fcty” prompt appears in the lower
display and “LOC” prompt appears in the upper display.
If “LOC” prompt does not appear in the upper display, press
either t
he “up” or “down” arrow key to reach the “LOC” Menu.
Under the “LOC” Menu, press the Advance key 3 times to
reach “Oper” setting.
Change the “Oper” setting to “Change” by using either the “up”
or “down” arrow key.
Exit the Factory Menus by pressing the Home key (
).
b. Changing the Watlow Offset Calibration
Press both the “up” and “down” arrow keys for 3 seconds.
The prompt “Oper” will appear in the lower display and the
prompt “User” will appear in the upper display.
If the upper display prompt does not read
“User”, use the “up”
or “down” arrow key to reach the “User” menu.
Press the Advance key 4 times to advance through the “User”
menu to “CAL1”.
Change the “CAL1” offset value by using either the “up” or
“down” arrow key to match the system output reading with the
Watlow temperature reading.
Exit the “Oper” Menu by pressing the Home key.
To lock the Watlow Controller, access the “Fcty” menu again
in the Factory Menus and change the “Oper” setting to “read”.
Press the Home key to exit.
2. Change the heater setpoint to 30
C and run for 10 minutes.