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Calibration of type APS
1.
Connect the correct power supply between terminals 1 and 2.
2. Connect the multimeter to measure the output signals (current or voltage) between terminals 3 and 4.
3. Wait for the sensor to warm-up (ca. 1 hour).
4. Using a T-connector connect the pressure input of the sensor with the pressure source and the absolute pressure reference.
Adjust the absolute pressure so that the output signal of the sensor is 0 Volt (for current output 0(4) mA). Using the trimmer
TP1 set the multimeter display to the corresponding value.
5.
Apply an absolute pressure to the pressure input to the sensor so that the output signal is 10 Volt (for current output20 mA).
Using the trimmer TP2 set the multimeter display to the corresponding value.
Response times
C14: Capacitor for electronic attenuation
Response times (t):
>
t
≈
R x C
>
C
≈
t / 50 kOhm
>
R = 50 k
Notes
Additional trimmers (TP3 to TP7) are installed in some options:
>
TP3: Matching trimmer for sensors with „+/-„ measurement ranges.
>
TP4: Adjustment of the internal resistance for current output.
>
TP5/TP6: Adjustment trimmer for special pressure ranges and special output signals.
>
TP7: Scaling and matching of analog and digital displays.
These trimmers are initially set in the factory. Adjusting these trimmers should only be done after consultation with the
supplier. Readjustment of the sensor does not require readjustment of the trimmers TP3 to TP7. Only the trimmers TP1
and TP2 must be readjusted if necessary according to the calibration instructions.
