Memmert HCP 246 Humidity Chambers (Generation 2003) - Manual (Page 34)

HCP page 34
17 Calibration
17.1 Temperature
User-calibration of oven at the controller, with three calibration temperatures selected by the user.
CAL.1
Temperature calibration at low temperature
CAL.2
Temperature calibration at medium temperature
CAL.3
Temperature calibration at high temperature
Either a positive or a negative calibration correction can be applied to each selected calibration point.
General calibration instructions:
1. Select the required calibration temperature in SETUP and set the corresponding calibration
correction to 0.0 °C.
2. Measure the deviation from the selected calibration temperature under steady conditions, using a
reference instrument.
3. Set the calibration correction in SETUP. If the measured reference temperature is too low, the
calibration correction setting has to have a negative sign.
4. Carry out a check measurement using the reference meter.
5. The procedure can be carried out for up to 3 calibration temperatures.
Example: Correction of a temperature deviation in the load at 60,0°C:
1. Set calibration temperature CAL.2 to 60.0 °C in SETUP and set the corresponding calibration
correction to 0.0 °C.
2.
Using a calibrated reference instrument, an actual temperature of 59.6°C is measured in
normal operation for a setpoint temperature of 60.0 °C.
3.
In SETUP set the calibration correction for CAL.2 to -0.4 °C.
4. After the oven has settled down the reference instrument should read 60.0°C.
5. With
CAL.1
a further calibration temperature can be programmed below CAL.2 , and with CAL.3 an
6. additional calibration temperature above CAL.2.
CAL. 1
+0,2 °C
CAL. 3
+0,3
°C
CAL. 2
-0,4
°C
factory
calibration
60°C 40°C 0°C 20°C 80°C