WIKA UT-11 - Manual (Page 22)

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Universal Pressure Transmitter UniTrans
Operation of Transmitters without Display
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Example:
A pressure transmitter with 0 ... 400 mbar (nominal pressure) is to be programmed.
The liquid’s surface (with a density of 1) is 1 m above the diaphragm at the zero point.
The maximum (span end-point) should be 3 m. The measuring range (span) is 200
mbar.
This means that the output must be set to 12 mA during programming.
5.4.3 Mounting correction of the sensor
The position of the measuring cell ist adjusted by simultaneously pressing (2 sec.) the
"zero" and "esc" buttons.
A change in the zero point has no effect on the adjusted span.
However, if the span end-point is higher than the peak value of the
transmitter’s nominal pressure range, then the span end-point is fixed
at this peak value and the span is reduced accordingly.
A change in the span setting has no effect on the zero point. The zero
point and span end-point must fall within the transmitter’s nominal
pressure range.
A test / correction of the zero point is suggested after adjusting the
span in order to maintain optimum accuracy.
A mounting correction should be carried out before or after making an
adjustment without pressure (dry adjustment) (see 5.4.3). The trans-
mitter must therefore be placed in the reference position for the mea-
surement (installation site) without pressure on the diaphragm.
I
ca lc
pressure difference (span) (300 mbar -100 mbar)
Sensors nominal pressure 400 mbar
---------------------------------------------------------------------------------------------------------------------------------- 16 mA 4 mA +
⋅ 12 mA = =
Enter
Value
Access
Function
... to Imeas = Icalc
Activate
Keypad
(2 sec.)
Calculate
Calibration Value
Calibration of span, without display, without pressure 027-DS-GB
current value decreases
Confirm
Calibration Value
... to Imeas = Icalc
current value increases
Icalc =
(2 sec.) (2 sec.)
Important
Mounting correction of the sensor
049-DS-GB
Calibration Value Function
(2 sec.) (2 sec.) (2 sec.)