Siemens SITRANS P - Manual (Page 17)

SITRANS P measuring instruments for pressure
Transmitters for gage, absolute and differential pressure
ZD series for gage and absolute pressure
2/17 Siemens FI 01 · 2009
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Overview
SITRANS P pressure transmitters, ZD series, are for measuring
the gage pressure, absolute pressure and level of liquids and
gases.
They are used to indicate and monitor the pressure measured at
the point of installation. ZD pressure transmitters are available in
an axial and a radial version.
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Benefits
• Robust stainless steel housing with 2 connection versions
• Integrated display with status messages
• Thin-film measuring cell with ceramic diaphragm
• 2-wire system, 4 ... 20 mA
• Parameterizable using keys underneath the housing cover
• Range adjustment 1:5 (max. 1:10)
• Measuring accuracy < 0.25% (typical)
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Application
The ZD is a configurable pressure transmitter for measuring the
gage and absolute pressure of gases, liquids and vapor.
It is equipped with a display for indicating the pressure value at
the point of installation.
SITRANS P pressure transmitters, ZD series, are used in the fol-
lowing industrial areas for example:
• Chemical industry
• Mechanical engineering
• Food industry
• Pharmaceutical industry
• Shipbuilding
• Water supply
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Design
The pressure transmitter is comprised of a thin-film measuring
cell with a ceramic diaphragm, an electronics board and a digi-
tal indicator.
All parts are accommodated in a stainless steel field housing
(
∅ 80 mm) with a glass cover and stainless steel process con-
nection.
At the rear of the housing is the electrical connection for the volt-
age supply using a current loop 4 ... 20 mA. The connection is
made with a plug connector.
At the front of the housing is the 5-digit display behind a glass
cover. Underneath the display are the 3 keys for parameterizing
the pressure transmitter. Above the display are a green and a red
LED for indicating the operating status.
The ZD pressure transmitter is available in two versions (see "Di-
mension drawing"):
In the radial version (type A) the display is fitted in parallel with
the process connection. The display can be rotated by up to
±120° relative to the process connection.
In the axial version (type B) the display is at right angles to the
process connection. The display can be rotated by 360° relative
to the process connection.
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Function
SITRANS P pressure transmitters, ZD series, mode of operation
Mode of operation
The ZD pressure transmitter has a thin-film strain gage which is
mounted on a ceramic diaphragm.
The measuring cell is temperature-compensated.
Functions
The ZD pressure transmitter has a 5-digit display behind a glass
cover. The following data are shown on the display:
• Measured pressure
• Technical pressure dimension (default setting: bar)
• Limit violation in upward or downward direction, indicated by
LED and arrow symbols in the display
The pressure transmitter is set using the 3 input keys behind the
glass cover underneath the display.
The key "M" is used to select the operating mode. Following
modes of operation are available:
• Measured value
• Password
• Dimension
• Start and end of scale
• Upper and lower limit value
• Zero adjustment
600.00
U
ref
P A/D
D/A
EEPROM
+
-
LCD
Red LED Green LED
µC
U
K
U
A U I
EMC
4 ... 20 mA U
H
, I
A
mbar
3 keys Configuring of parameters
A/D Analog-to-digital converter
D/A Digital-to-analog converter
EEPROM Memory for all parameters
EMC Output stage with protective components
I
A
Output current
U
ref
Reference voltage
LCD Display of measured values with dimensions
Green LED Display of normal mode
Red LED Display of error messages or limit violation
P Ceramic measuring cell
U
H
Power supply
µC Microcontroller for computing functions and monitoring
3 keys
© Siemens AG 2008