SITRANS P250

© Siemens AG 2015
Pressure Measurement
Transmitters for basic requirements
1
SITRANS P250 for differential pressure
Mode of operation
■ Overview
p1
p2
U
const.
U
I
I0, UB
SITRANS P250 pressure transmitter, function diagram
The piezo-resistive measuring cell (ceramic membrane) has a
Wheatstone bridge circuit, on which the operating pressure P1
and P2 of the media acts at both ends.
The voltage output from the measuring cell is converted by an
amplifier into an output current of 4 to 20 mA or an output voltage
of 0 to 5 or 10 V DC.
The SITRANS P250 transmitter measures the differential pressure of
liquids and gases.
■ Benefits
■ Technical specifications
•
•
•
•
High measuring accuracy
Sturdy stainless steel enclosure
For aggressive and non-aggressive media
For the measurement of the differential pressure of liquids
and gases
• Temperature-compensated measuring cell
• Compact design
■ Application
The SITRANS P250 transmitter for differential pressure is
primarily used in the following industries:
• Chemical industry
• Heating, ventilation and air conditioning technology
• Food industry
• Mechanical engineering
• Shipbuilding
• Water supply
■ Design
Main components:
• Stainless steel enclosure with piezo-resistive ceramic measuring cell (temperature-compensated) and electronics module
• Process connection made of stainless steel in diverse designs
(see Selection and Ordering data)
• Electrical connection through connectors acc. to
EN 175301-803-A and round connectors M12, as well as with
permanently fixed cable
■ Function
SITRANS P250 differential pressure transmitter
Application
Differential pressure transmitter
Liquids and neutral gases
Mode of operation
Measuring principle
Piezo-resistive measuring cell
(ceramic diaphragm)
Input
Measured variable
Differential pressure
Measuring range
0 ... 0.1 to 0 ... 25 bar
(0 ... 1.45 to 0 ... 363 psi)
Operating pressure
 25 bar at a differential pressure
range > 6 bar
 50 bar at a differential pressure
range > 10 bar
Burst pressure
1.5 x operating pressure
Output
Output signal
• Current output signal
4 ... 20 mA
• Voltage output signal
0 ... 5 V DC and 0 ... 10 V DC
Load
• 3-wire
> 10 k
• 2-wire
 (UH - 11 V) / 0.02 A
Measuring accuracy
Error in measurement at limit setting incl. hysteresis and reproducibility
 1 % of typical full-scale value,
see "Measuring range" table"
Long-term stability acc. to IEC 60770
 0.5 % of full-scale value/year
Influence of ambient temperature
The pressure transmitter measures the differential pressure of
liquids and gases.
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The output current and voltage are linearly proportional to the input pressure.
Siemens FI 01 · 2015 US Edition
• Start of scale
 0.6 % / 10 K of full-scale value
( 1.2 % / 10K for measuring cell
0 ... 0.1 bar (1.45 psi))
• Full-scale value
 0.22 % /10 K of full-scale value
( 0.37 % / 10K for measuring
cell 0 ... 0.1 bar (1.45 psi))
Dynamic behavior
Suitable for static and dynamic
measurements
Step response time T99
< 5 ms
Load variation
< 50 Hz
© Siemens AG 2015
Pressure Measurement
Transmitters for basic requirements
SITRANS P250 for differential pressure
Rated conditions
Measuring range
Ambient conditions
• Temperature of medium
-15 ...+85 °C (5 ... 185 °F)
• Ambient temperature
-15 ...+85 °C (5 ... 185 °F)
• Storage temperature
-40 ...+85 °C (-40 ... +185 °F)
Degree of protection acc. to
EN 60529
IP65
Mounting position
Any
Mounting
Mounting bracket, included in
delivery
Design
Weight
Approx. 430 g (approx. 0.95 lb)
Enclosure material
Stainless steel 1.4305/AISI 303
Electrical connection
• Plug EN 175301-803-A
• Circular plug EN 60130-9
• Cable 1.5 m
Process connection
• Hose sleeve Ø 4 mm/6 mm
• Pipe union Ø 6 mm/8 mm
• Male thread 7/16-20 UNF,
G1/8"
• Female thread 1/8-27 NPT
• (Standard), G1/8"
Max.
Burst
perm. oper- pressure
ating pressure (on
either side)
Max.
perm. operating pressure (on
one side)
Accuracy
[bar]
[inH2O]
0 ... 0.1
0 ... 40.18
25 bar
(363 psi)
37.5 bar
(544 psi)
0.6 bar
(241 inH2O)
 1.0 %
0 ... 0.2
0 ... 80.37
25 bar
(363 psi)
37.5 bar
(544 psi)
0.6 bar
(241 inH2O)
 0.8 %
0 ... 0.25 0 ... 100.46 25 bar
(363 psi)
37.5 bar
(544 psi)
0.6 bar
(241 inH2O)
 0.5 %
0 ... 0.3
0 ... 120.56 25 bar
(363 psi)
37.5 bar
(544 psi)
0.6 bar
(241 inH2O)
 0.5 %
0 ... 0.4
0 ... 160.74 25 bar
(363 psi)
37.5 bar
(544 psi)
1.2 bar
(482 inH2O)
 0.8 %
0 ... 0.5
0 ... 200.9
25 bar
(363 psi)
37.5 bar
(544 psi)
1.2 bar
(482 inH2O)
 0.5 %
0 ... 0.6
0 ... 241.0
25 bar
(363 psi)
37.5 bar
(544 psi)
1.2 bar
(482 inH2O)
 0.5 %
0 ... 1.0
0 ... 402.0
25 bar
(363 psi)
37.5 bar
(544 psi)
2 bar
(804 inH2O)
 0.5 %
0 ... 1.6
0 ... 643.0
25 bar
(363 psi)
37.5 bar
(544 psi)
3.2 bar
 0.5 %
(1286 inH2O)
0 ... 2.5
0 ... 1005
25 bar
(363 psi)
37.5 bar
(544 psi)
5 bar
(2009 H2O)
Wetted parts materials
 0.5 %
• Process connection
Stainless steel 1.4305/AISI 303,
brass nickel-plated
0 ... 4
0 ... 1607
25 bar
(363 psi)
37.5 bar
(544 psi)
8 bar
 0.5 %
(3215 inH2O)
• Diaphragm
Ceramic Al2O3 (96 %)
0 ... 6
0 ... 2411
25 bar
(363 psi)
37.5 bar
(544 psi)
• Sealing material
FPM (standard), EPDM, NBR,
MVQ, CR
12 bar
 0.5 %
(4822 inH2O)
0 ... 10
0 ... 4019
50 bar
(725 psi)
75 bar
(1088 psi)
20 bar
 0.5 %
(8037 inH2O)
0 ... 16
0 ... 6430
50 bar
(725 psi)
75 bar
(1088 psi)
32 bar
(464 psi)
 0.5 %
0 ... 25
0 ... 10046
50 bar
(725 psi)
75 bar
(1088 psi)
50 bar
(725 psi)
 0.5 %
Power supply UH
Terminal voltage on pressure
transmitter
• 2-wire, 4 ... 20 mA
11 ... 33 V DC
• 3-wire, 0 ... 5 V DC
11 ... 33 V DC/24 V AC 15 %
• 3-wire, 0 ... 10 V DC
18 ... 33 V DC/24 V AC 15 %
■ Schematics
Current consumption at nominal
pressure
• 2-wire
< 20 mA
• 3-wire
< 5 mA
Protection against polarity reversal
Protected against short-circuit
and polarity reversal. Each connection against the other with
max. supply voltage.
IO
Connection: 1 (+),
2 (-)
+
2-
UB
RL
IO Output current
RL Load
UB Power supply
Connection with current output 4 ... 20 mA and plug to EN 175301-803-A
Certificates and approvals
Approval
1+
1
2
CE conformity
1+
3
IO
2
1
Connection: 1 (+),
3 (-)
+
UB
RL
3-
IO Output current
RL Load
UB Power supply
Connection with current output 4 ... 20 mA and round connector
1+
2-
IO
Connection: 1 (+, brown),
2 (-, green)
+
RL
UB
IO Output current
UB Power supply
RL Load
Connection with current output 4 ... 20 mA and permanently fixed cable
Siemens FI 01 · 2015 US Edition
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1
© Siemens AG 2015
Pressure Measurement
Transmitters for basic requirements
SITRANS P250 for differential pressure
1+
3
+
1
2+ U
2
UB
RL
O
3-
Round connector
EN 60130-9
Connection: 1 (+UB),
2 (-),
3 (+U0)
UO Output voltage
RL Load
UB Power supply
3
2
+
UB
RL
2
1
Connection: 1 (+UB, brown),
2 (+U0, green),
3 (-, white)
UO Output voltage
UB Power supply
RL Load
Connection with voltage output 0 ... 5 V DC (0 ... 10 V DC) and round
connector
1+
UO
3+
+
UB
RL
2-
Connection: 1 (+UB),
2 (-),
3 (+U0)
Uo Output voltage
UB Power supply
RL Load
(mounted)
3 UO
~108 (4.3)
1
~158 (6.2)
Connection with voltage output 0 ... 5 V DC (0 ... 10 V DC) and plug to
EN 175301-803-A
SITRANS P250 differential pressure transmitter with round connector to
EN 60130-9, dimensions in mm (inch)
Connection with voltage output 0 ... 5 V DC (0 ... 10 V DC) and permanently fixed cable
Cable
■ Dimensional drawings
(mounted)
~ 136 (5.4)
102 (4.02)
~138 (5.4)
~95 (3.7)
Ø 25
(0.98)
Socket outlet
EN 175301-803-A
Stainless steel
P2
SITRANS P250 differential pressure transmitter with cable,
dimensions in mm (inch)
P1
M4
44 (1.7)
5 (0.2)
15 ± 0,5 21 ± 0,8
1
20 (0.79)
X
SITRANS P250 differential pressure transmitter with socket outlet to
EN 175301-803-A, dimensions in mm (inch)
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Siemens FI 01 · 2015 US Edition
© Siemens AG 2015
Pressure Measurement
Transmitters for basic requirements
SITRANS P250 for differential pressure

Process connections
Width across
flats
[mm] [inch]
Hose connection for hose (brass nickelplated)
X
[mm] [inch] [mm] [inch]
4
0.16
a = 10
20
0.79
61
2.40
6
0.24
a = 10
25
0.99
66
2.60
Pipe union with screw-in nipple for outer pipe 6
(brass nickel-plated)
0.24
a = 10
b = 12
24
0.95
65
2.56
8
0.32
a = 12
b = 14
25
0.99
66
2.60
Pipe union with screw-in nipple for outer pipe 6
(stainless steel 1.4305/AISI 303)
0.24
a = 10
b = 12
24
0.95
65
2.56
8
0.32
a = 12
b = 14
26
1
67
2.64
Male thread 7/16-20 UNF
(brass nickel-plated)
-
-
a = 14
18
0.71
59
2.32
Female thread G1/8
(stainless steel 1.4305/AISI 303)
-
-
a = 14
12
0.47
53
2
Male thread G1/8
(brass nickel-plated)
-
-
a = 10
b = 12
20
0.79
61
2.40
1/8-27 NPT
L
L
a
1/8-27 NPT
L
b
a
1/8-27 NPT
L
a
b
1/8-27 NPT
7/16-20 UNF
L
a
1/8-27 NPT
L
G1/8
a
1/8-27 NPT
L
a
b
Siemens FI 01 · 2015 US Edition
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1
© Siemens AG 2015
Pressure Measurement
Transmitters for basic requirements
1
SITRANS P250 for differential pressure
■ Selection and Ordering data
SITRANS P 250 pressure transmitter for differential pressure
Accuracy  1 %, wetted parts ceramic/stainless steel 1.4301,
scope of delivery: transmitter, mounting bracket and instruction manual, without explosion protection
Article No.
Order code
7 M F 1 6 4 1 - 7777 0 - 777 0 777
Click on the Article No. for the online configuration in the PIA Life Cycle Portal.
Measuring range
(0 ... 40.19 inH2O)
0 ... 0.1 bar
(0 ... 80.37 inH2O)
0 ... 0.2 bar
(0 ... 100.46 inH2O)
0 ... 0.25 bar
(0 ... 120.56 inH2O)
0 ... 0.3 bar
(0 ... 160.74 inH2O)
0 ... 0.4 bar
(0 ... 201.0 inH2O)
0 ... 0.5 bar
(0 ... 241.0 inH2O)
0 ... 0.6 bar
(0 ... 402.0 inH2O)
0 ... 1.0 bar
(0 ... 643.0 inH2O)
0 ... 1.6 bar
(0 ... 1005.0 inH2O)
0 ... 2.5 bar
(0 ... 1607.0 inH2O)
0 ... 4.0 bar
(0 ... 2411.0 inH2O)
0 ... 6.0 bar
(0 ... 4019.0 inH2O)
0 ... 10.0 bar
(0 ... 6430.0 inH2O)
0 ... 16.0 bar
(0 ... 10046 inH2O)
0 ... 25.0 bar
3 AA
3 AC
3 AD
3AE
3AF
3 AG
3 AH
3 BA
3 BB
3 BD
3BE
3 BG
3 CA
3 CB
3 CD
Other version, add Order code and plain text (Note: smallest possible span 100 mbar (40.19 inH2O)
9 AA
Output signal
4 ... 20 mA
0 ... 5 V DC
0 ... 10 V DC
0
1
2
Electrical connection
Plug acc. to EN 175 301-803-A (suitable coupling included in scope of delivery)
Round connector acc. to EN 60139-9
Cable 1.5 m with cable gland
1
2
3
Process connection
Without connections, female thread 1/8-27 NPT
Hose connection
• Brass nickel-plated, for hose  4 mm
• Brass nickel-plated, for hose  6 mm
A
B
C
• PVDF, for hose  6 mm
Pipe union
• Brass nickel-plated, for pipe  6 mm
• Stainless steel 1.4304, for pipe  6 mm
• Brass nickel-plated, for pipe  8 mm
• Stainless steel 1.4304, for pipe  8 mm
Male thread, 7/16-20 UNF (Brass nickel-plated)
Adapter
• Inner, G1/8 (stainless steel), for pipe mm
• Outer, G1/8 (Brass nickel-plated), with union nut, for pipe 6 mm
D
E
F
G
H
L
M
N
Sealing material
Fluoro rubber (Viton/FPM)
Ethylene propylene diene monomer rubber (EPDM)
Nitrile butadiene rubber (NBR)
Silicone rubber (MVQ)
A
B
C
D
E
Neoprene (CR)
Further designs
Order code
Please add "-Z" to Article No. and specify Order code(s).
Quality inspection certificate (factory calibration) to IEC 60770-2
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Siemens FI 01 · 2015 US Edition
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