Instruction manual PS11/PK11
8
The zero point can be calibrated after the pressure transducer has warmed up. The
voltage should be set to 0V with open ports using P1, then the current should be set
to 4mA using P4.
At the pressure input for the sensor (+) provide the correct nominal pressure (100%
measurement range), and calibrate the output of the instrument to 10V using the P2
potentiometer. Parallel to this operation, set the current to 20mA using P3.
Repeat both these setting operations, if necessary.
5
Adjusting the switching threshold
The floating contact point functions as a changeover contact, i.e. it can be used as an
NO contact or an NC contact. The following describes how to set the contact point with
the NO contact function. The same instructions apply to setting the NC contact
function, only the function is inverted.
You can access the P6 potentiometer through a bore in the front of the instrument. If
the ports use elbow connectors, you may have to twist them out of the way.
Set the switching point as follows:
Connect a continuity tester to terminals 6 and 8.
Provide the correct supply voltage.
Provide the correct pressure at which the relay should shut off.
Now turn P6 until the continuity tester hums.
If the continuity tester is humming before you set the contact, turn P6 in the
opposite direction until it stops humming.
Now change the pressure in order to test whether the switching point has been set
correctly (correct if necessary).
P1: zero point (0 V)
P2: final value U (10 V)
P3: final value I (20 mA)
P4: zero point I (4 mA)
P5: Offset negative pressure
P6: Contact point relay
only PK11
