WIKA UniTrans UT-10 User Manual

Published 16.2.04
C
Universal Pressure Transmitter UniTrans
Operation of Transmitters without Display
Subject to change due to technical modifications. © Copyright WIKA Alexander Wiegand GmbH & Co. KG / BRD
WIKA Alexander Wiegand GmbH & Co. KG · Alexander-Wiegand-Str. · 63911 Klingenberg ·

(09372) 132 - 710 · Fax - 706 · E-mail: support-tronic@wika.de · www.wika.de
60
5.4 Calibration without Pressure
Determine the current reference values for the zero point and the span to be entered
in the transmitter before calibration. This is done as follows:
5.4.1 Zero Point Calibration
• Determine the h
y
drostatic pressure of the liquid’s surface that meets the zero point.
• Adjust this pressure in proportion to the sensor’s nominal pressure ran
g
e.
• Multipl
y
this proportion b
y
16 mA and add 4 mA to the result.
This produces the calculated current (value I
calc
), which is entered in the transmitter
and used to pro
g
ramm the zero point (0%).
Example:
A pressure transducer with 0 ... 400 mbar (nominal pressure) needs to be pro-
g
rammed.The liquid’s surface (with a densit
y
of 1) is 1 m above the diaphra
g
m at the
zero point producin
g
a pressure of 100 mbar.
This means that the device’s current value must be set to 8 mA when performin
g
a dr
y
(empt
y
) calibration.
5.4.2 Span Calibration
• Determine the h
y
drostatic pressure of the liquid’s surface, which corresponds to the
span end-point.
• Calculate the difference of the pressure value between span end-point and zero
point and divide this difference b
y
the nominal pressure ran
g
e of the sensor.
• Multipl
y
this proportion b
y
16 mA and add 4 mA to the result.
This produces the calculated current (value I
calc
), which is entered in the transmitter
and used to pro
g
ram the span end-point (100%).
The measurement ran
g
e between zero point and span end-point will be stored as
span.
I
calc
Zero point pressure (0%) 100 mbar
Sensors nominal pressure 400 mbar
------------------------------------------------------------------------------------------------
16 mA 4 mA
+
⋅ 8 mA
==
Calibration Value
calc
Calibration of zero point, without display, without pressure
Calibration Value
... to I
meas
=I
calc
... to I
meas
=I
calc
(2 sec.)
(2 sec.)
(2 sec.)
026-DS-GB

WIKA UniTrans UT-10 Specifications

General

Brand	WIKA
Model	UniTrans UT-10
Category	Transmitter
Language	English