WIKA IUT-11 - Manual (Page 40)

Universal IS Pressure Transmitter UniTrans
Operation of Devices without Displays
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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.
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 8.4.3). The trans-
mitter must therefore be placed in the reference position for the mea-
surement (installation site) without pressure on the diaphragm.
I
calc
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
current value decreases
Confirm
Calibration Value
... to Imeas = Icalc
current value increases
Icalc =
(2 sec.) (2 sec.)
027-DS-GB
Important