Memmert PM 200/400/500 Pump Module (Generation 2003) - Manual (Page 38)

VO page 38
24 Calibration
24.1 Calibration-temperature
User-calibration of oven and controller, with three calibration temperatures selected by the user.
CAL1 temperature calibration at low temperature
CAL2 temperature calibration at medium temperature
CAL3 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 100°C.
1. Set calibration temperature CAL.2 to 100.0°C in SETUP and set the corresponding calibration
correction to 0.0°C.
2. Using a calibrated reference instrument, an actual temperature of 99.6°C is measured in normal
operation for a setpoint temperature of 100°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 100.0°C.
5. With
CAL.1
a further calibration temperature can be programmed below CAL.2 , and with CAL.3 an
additional calibration temperature above CAL.2.
CAL 1
+0,5°C
CAL 3
+0,8°C
CAL 2
-0,4°C
factor
y
calibration
180°C
100°C 0°C
40°C