Siemens SITRANS P Manual de usuario descargar pdf (Pagina 22)

SITRANS P measuring instruments for pressure

Transmitters for food, pharmaceuticals and biotechnology

SITRANS P Compact

for gage and absolute pressure

2/22

Siemens FI 01 · 2009

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Function

The process pressure acts on a piezo-resistive semiconductor

measuring bridge through a remote seal and a transmission liq-

uid. The pressure transmitter converts the pressure values into a

load-independent current.

A compensation network makes the output signal largely inde-

pendent of the ambient temperature. As a result of a specially

adapted remote seal connection with minimized volume, the in-

fluence of the process temperature on the output signal is

greatly reduced compared to a conventional screw connection.

The pressure transmitters can be powered with a non-regulated

DC voltage of 10 to 30 V. Output signals common to measuring

technology are available.

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Technical specifications

Pressure transmitters for food, pharmaceuticals and biotechnology

Mode of operation

Measuring principle Piezo-resistive

Input

Measured variable Gage or absolute pressure

Measured range 0 ... 160 mbar (0 ... 2.32 psi)

...

0 ... 40 bar (0 ... 580 psi)

Output

Output signal

• Two-wire system 4 ... 20 mA

• Three-wire system 0 ... 20 mA

Measuring accuracy To EN 60770-1

Linearity error including hysteresis

(reference point adjustment)

≤ 0.2% of full-scale value

Adjustment accuracy ≤± 0.2% of full-scale value

Adjustment time < 20 ms

Influence of ambient temperature

On th enclosure

• Zero < 0.2%/10 K of full-scale value

• Measured span < 0.2%/10 K of full-scale value

On the process connection (remote

seal)

Zero error (depends on design)

• Flange remote seal

- DN 25 / 1" 4.8 mbar/10 K (0.070 psi/10 K)

- DN 32 / 1¼” 2.3 mbar/10 K (0.033 psi/10 K)

- DN 40 / 1½” 1.6 mbar/10 K (0.023 psi/10 K)

- DN 50 / 2" 0.6 mbar/10 K (0.009 psi/10 K)

• Clamp-on seal

- DN 25 / 1" 9.5 mbar/10 K (0.138 psi/10 K)

- DN 32 / 1¼” 4.1 mbar/10 K (0.060 psi/10 K)

- DN 40 / 1½” 3.9 mbar/10 K (0.057 psi/10 K)

- DN 50 / 2" 3.9 mbar/10 K (0.057 psi/10 K)

The zero error specified for the process connection should be consid-

ered as a guideline for a standard design. We will produce a detailed

system calculation on request. Systems with reduced remote seal errors

are available on request.

Rated conditions

Installation conditions

• Mounting position Any, vertical as standard

Ambient conditions

• Ambient temperature -10 ... +70 °C (14 ... 158 °F)

• Storage temperature -10 ... +90 °C (14 ... 194 °F)

• Process temperature Max. 200 °C (392 °F), depends

on design

• Degree of protection (to EN 60529) IP65, optional IP67

• Electromagnetic compatibility

- Emitted interference To EN 50081 Part 1, issue 1993

(residential and industrial areas).

The unit has no own emissions.

- Interference immunity to EN 50082 Part 2, issue March

1995 (industrial areas)

Design

Weight (without remote seal)

• Field housing ≈ 460 g (≈ 1.01 lb)

• Housing with plug ≈ 200 g (≈ 0.44 lb)

Housing

• Designs • Field housing IP65 or IP67, with

screwed gland

• Angled plug DIN 43650, IP65

• Cable connection, IP67

• Round plug connector M12,

IP65

• Material Stainless steel, mat.

No. 1.4404/1.4305

Material of union nut Polyamide (with electrical con-

nection using plug or cable)

Electronics unit potted with sili-

cone

Internal ventilation for measuring

ranges < 16 bar (< 232 psi),

through housing thread or con-

nection cable depending on

design

Process connection

• Versions See Ordering data

• Material of coupling Stainless steel, mat.

No. 1.4404/316L

Power supply

Terminal voltage on transmitter 10 ... 30 V DC

Rated voltage 24 V DC

Certificate and approvals

Classification according to pressure

equipment directive

(DRGL 97/23/EC)

For gases of fluid group 1 and liq-

uids of fluid group 1; complies

with the requirements of article 3,

paragraph 1 (appendix 1);

assigned to category III, confor-

mity evaluation module H by the

TÜV Nord

Explosion protection

• Intrinsic safety "i" TÜV 03 ATEX 2099 X

- Identification Ex II 2G EEx ib IIC T6

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 233 234

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