25
PTB150-MAN-V14.0
PTB 150-157 Instruction Manual
CALIBRATION OF THE
EXT
+
REF
INPUTS with a signal calibrator
The purpose of the re-calibration is to correct the EXT and REF inputs error together.
To calibrate the two inputs, it is necessary to have a Pt100 calibrator and/or a thermocouples calibrator
depending on what is to be calibrated.
Calibration of the EXT input automatically reproduces the same calibration on the REF input:
1. On the second menu level, select the type of EXT input to calibrate (Pt100, Tc K, Tc J, Tc N, TcR, Tc
S, Tc E) following the instructions in the manual. Press E key to confirm.
2. Enter the third menu level (see instructions) and press the
or
key to set Cal_chnl=
EXT
. Press
E to accept.
3. Choose two calibration points depending on the appliance range or the field where one wishes to
carry out calibration. (For example 0 and 450°C for PT100, 200 and 800°C for the thermocouples).
4. Connect the signal generator to the EXT input, generating the first calibration value. See the
instructions for the connection.
5. Select P1 and press the
or
key to set the first value (for example 0°C). Press E Key to confirm.
Confirmation is indicated by the symbol * which appears on the display after about 5 seconds.
6. Generate the second calibration value with the signal generator. See the instructions for the
connections.
7. Select P2 and press the
or
key to set the second value (for example 450°C). Press E Key to
confirm. Confirmation is indicated by the symbol * which appears on the display after about 5
seconds.
8. Select
CAL: EXT
Set
Y
es and confirm pressing E Key. The procedure takes a few seconds. At the
end there is a Beep.
CALIBRATION OF THE
REF
INPUT with a with probe connected
This operation adapts the value indicated by the REF input to the value indicated by the probe connected to
it, compensating its errors.
To carry out the calibration it is necessary to connect the probe to the REF terminals and to have a standard
thermometer
1. Connect the probe to the
REF
input following the instructions in the manual.
2. Insert the probe in the suitable hole in the appliance.
3. Insert the standard thermometer in the appliance.
4. Set the first calibration point and wait for the appliance to be stable (see symbol
÷)
5. Enter the third menu level (see instructions) and select Cal_chnl=
REF
. Press E key to accept.
6. Select P1 and press the
or
key to set the value read with the standard thermometer. Press E
key to accept. Confirmation is indicated by the symbol * which appears on the display after about 5
seconds.
7. Return to the first menu level and set the second set point. Then wait for the appliance to be stable
(see symbol
÷).
8. Enter the third menu level (see instructions), select P2 and press the
or
key to set the value
read with the standard thermometer. Press E Key to accept. Confirmation is indicated by the symbol
* which appears on the display after about 5 seconds.
9. Select
CAL: REF
Set
Y
es and confirm pressing E Key. Calibration begins. The procedure takes a
few seconds. At the end there is a Beep.
