7800-25 Series Operations Manual
Rev B 11-10-2020
Page 36 of 56
Temperature calibration (example)
If the chamber temperature display reads 20.3
C and the calibrated independent
sensor shows 20.0
C, set the temperature offset value to 0.3
C. If the calibrated
independent sensor shows 19.6
C, then the entered offset should be negative. In this
example the required offset to temperature would be -0.4
C.
Calibrating Humidity Offset
If humidity calibration is needed, the following steps can be taken:
Locate the reference instrument’s humidity sensor in close proximity to the cabinet’s
geometric center. Be sure that the stabilization times described earlier have been
satisfied prior to performing this calibration.
A positive value will move the humidity ‘up’ and a negative value ‘down’. Press the
‘home’ button and verify the proper humidity is displayed.
Humidity calibration (example)
If the chamber humidity display reads 50% and the calibrated independent sensor
shows 53%, set the humidity offset value to 3.0%. If the calibrated independent sensor
shows 44%, then the entered offset should be negative. In this example the required
offset to humidity would be -6.0%.
Calibrating H2O2 Heater Resistance
When purchasing a new heater (or PM kit) from Caron, the heater will come with a
resistance value documented. Enter that new ohm value for the Heater Calibration.
The calibration resistance value may be determined by measuring the electrical
resistance (in ohms) between the two heater connection pins. This value should be
between 20 & 26 ohms.
