Siemens SITRANS P - Manual (Page 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
© Siemens AG 2008