Specifications

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Siemens FI 01 · 2015 US Edition

Temperature Measurement

Transmitters for rail mounting

SITRANS TW four-wire system, universal, HART

Auxiliary power

Universal power supply unit 115/230 V AC/DC or 24 V AC/DC

Tolerance range for power supply

• With 115/230 V AC/DC PSU 80 ... 300 V DC; 90 ... 250 V AC

• With 24 V AC/DC PSU

18 ... 80 V DC; 20.4 ... 55.2 V AC

(in each case interruption-resis-

tant up to 20 ms in the complete

tolerance range)

Tolerance range for mains frequency 47 ... 63 Hz

Power consumption with

• 230 V AC  5 VA

•230 V DC  5W

• 24 V AC

 5 VA

•24 V DC

 5W

Electrically isolated

Electrically isolated circuits Input, output, power supply and

sensor fault/limit monitoring out-

put are electrically isolated from

one another. The HART interface

is electrically connected to the

output.

Working voltage between all electri-

cally isolated circuits

The voltage U

rms

between any

two terminals must not exceed

300 V

Measuring accuracy

Accuracy

• Error in the internal cold junction  3°C  0.1 °C / 10 °C

( 5.4 °F  0.18 °F / 18 °F)

• Error of external cold junction ter-

minal 7NG3092-8AV

 0.5 °C  0.1 °C / 10 °C

( 0.9 °F  0.18 °F / 18 °F)

• Digital output See "Digital error"

• Analog output I

or U

 0.05 % of the span plus digital

error

Influencing effects (referred to the

digital output)

Compared to the max. span:

• Temperature drift  0.08 % / 10 °C ( 0.08 % /18 °F)

 0.2 % in the range

-10...+60°C (14...140°F)

• Long-term drift

 0.1 % / year

Influencing effects referred to the

analog output I

or U

Compared to the span:

• Temperature drift

 0.08 % / 10°C ( 0.08 % / 18 °F)

 0.2 % in the range

-10...+60°C (14...140°F)

• Power supply

 0.05 % / 10 V

• Load with current output

 0.05 % on change from 50  to

650 

• Load with voltage output  0.1 % on change in the load

current from 0 mA to 10 mA

• Long-term drift (start-of-scale val-

ue, span)

 0.03 % / month

Response time (T

without electri-

cal damping)

 0.2 s

Electromagnetic compatibility

According to EN 61 326 and

NAMUR NE21

Certificates and approvals

ATEX To DIN EN 50014: 1997,

EN 50020: 1994

Intrinsic safety to EN 50 020

• for 7NG3242-xAxxx II (1) G D [EEx ia/ib ] IIB

• for 7NG3242-xBxxx

II (1) G D [EEx ia/ib ] IIC

EC type-examination certificate TÜV (German Technical Inspec-

torate) 01 ATEX 1675

Other certificates

GOST, NEPSI

Conditions of use

Installation conditions

Location (for devices with explosion

protection)

• Transmitters Outside the potentially explosive

atmosphere

• Sensor

Within the potentially explosive

atmosphere zone 1 (also in zone

0 in conjunction with the pre-

scribed protection requirements

for the sensor)

Ambient conditions

Permissible ambient temperature -25 ... +70 °C (-13 ... +158 °F)

Permissible storage temperature

-40 ... +85 °C (-40 ... +185 °F)

Climatic class

• Relative humidity 5 ... 95 %, no condensation

Design

Weight Approx. 0.24 kg (0.53 lb)

Enclosure material PBT, glass-fibre reinforced

Degree of protection to IEC 529 IP20

Degree of protection to VDE 0100 Protection class I

Type of installation 35-mm DIN rail (1.38 inch)

(EN 50022) or 32-mm G-type rail

(1.26 inch) (EN 50035)

Electrical connection / process con-

nection

Screw plug connectors, max.

2.5 mm² (0.01 inch²)

Parameterization interface

Protocol HART, version 5.9

Load with connection of

• HART communicator 230 ... 650 

• HART modem 230 ... 500 

Software for PC/laptop SIMATIC PDM version V5.1 and

later