Siemens SITRANS P Manual de usuario descargar pdf (Pagina 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 pressur

e 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

ref

A/D

D/A

EEPROM

LCD

Red LEDGreen LED

µC

EMC

4 ... 20 mA

, I

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

Output current

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

Power supply

µC Microcontroller for computing functions and monitoring

3 keys

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 233 234

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