Heater Calibration Procedure - Process Technology Lufran LUF Series Manual

Engineering Information (Continued):

Heater Calibration Procedure:

This calibration procedure should be performed the first time the unit is operated. While this unit was
tested and calibrated prior to shipment, this procedure will help correct for some offsets caused by
variations in nominal supply voltages.
differences, performing this procedure will improve heater response.
This calibration startup procedure will disable the correction routines for the DAC control system and
allow the unit to operate with an open loop control. By observing the performance of this unit without any
error correction, the operator may adjust the heater to improve heater response. This procedure may not
be performed while the unit is in MANUAL or REMOTE control mode.
This procedure must be performed by accessing the HEATER CALIBRATION menu which can be
reached through the SECURE MENU.
1) Once the installation and startup procedure is complete, insure that there is an adequate and steady
flow of water through the unit. Fluctuations in water flow will affect the results of calibration.
2) Access the HEATER CALIBRATION menu through the SECURE MENU on the operator-interface
panel (OIP).
3) Press the PROCESS SETPOINT value and using the keypad change the setpoint to the desired
value.
4) Turn the OFF-ON switch to ON. This will turn on the heater calibration mode. The offset value will be
reset to 100.
5) Within a few seconds of switching HEATER CALIBRATION on, press the HEAT ON/OFF button to
start the unit.
6) Allow enough time for the heater to ramp up to the process setpoint and to stabilize. Depending upon
the flow rate and the wattage of the unit, this could take several minutes.
7) Once stabilized, record the value in the COMPUTE OFFSET field.
8) Turn the OFF-ON switch to OFF. This will turn off heater calibration mode.
9) Press the OFFSET VALUE field and using the keypad enter the COMPUTE OFFSET value recorded
in step 7.
10) Press BACK to return to the secure menu.
M-43-25
Revision - Date 03-01-04-18
While the DAC control system will compensate for these
Figure 18: Heater Calibration Menu
28
LUF-Series Lufran Manual
Standard outlet, Standard Interface