Adjustment Of Zero Point And Span - WIKA S-11 Manual De Instrucciones

7. Adjustment of zero point and span

7. Adjustment of zero point and span
Only adjust the span-setting potentiometer if calibration equipment is available which has at least three
EN
times the accuracy of the pressure transmitter.
7.1 Preparation (figure A)
To gain access to the potentiometers, open the instrument as follows:
Disconnect the electrical connection
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Remove the clamping nut
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Carefully pull the instrument connector
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Connect the instrument connector
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(e.g. ammeter, voltmeter) according to the connection diagram.
7.2 Adjustment of zero point (figure B)
Go to the start of the measuring range.
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Using potentiometer "Z", adjust the minimum output signal (e.g. 4 mA)
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7.3 Setting the span (figure B)
Go to the end of the measuring range.
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Using potentiometer "S", adjust the maximum output signal (e.g. 20 mA)
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Check the zero point and if there is any deviation, re-adjust it.
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Repeat the procedure until the zero point and the span are set correctly.
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7.4 Finish the adjustment (figure A)
Disconnect the instrument connector
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display unit.
Carefully push the instrument connector
■
damaging the wires or the seals. The seals must be clean and undamaged in
order to guarantee the given ingress protection.
Tighten the clamping nut
■
After the adjustment, check that the system is functioning correctly.
Recommended recalibration cycle: 1 year
20
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from the instrument.

.

from the instrument.
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to the power supply and a display unit

from the power supply and the

onto the instrument, without
.

WIKA operating instructions pressure transmitter, model S-11
A



B