Siemens SITRANS P 7MF1562, Инструкция по эксплуатации

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7MF1562 3
Figure 1 Transmitter Type 7MF1562
Note
The instructions do not contain all information details of the
product for clarity reasons.
May we also point out that the contents of the instructions are
neither part of an earlier or existing agreement, acceptance or
legal relationship nor an amendment of such. All the obligations
of the Siemens AG are given by the respective contract of sale
which also contains the full and solely valid warranty conditions.
1 Technical Description
1.1 Range of Application
The type 7MF1562 is a pressure transmitter for measuring
relative pressures of the gases, liquids and steam in the
energetics and mechanical engineering industry, ship building,
water supply etc. One application example is the measuring of
the pressure of compressed air containing oil in compressors
and compressor stations.
1.2 Structure
The pressure transmitter consists of a thin-film measuring cell
with a ceramic diaphragm and electronics board both installed in
the brass housing. The electrical connection is made by a right-
angled connector (DIN 43650) with a Pg 9 cable gland. The
device is connected with the process connection G½A (external
thread) or G?A (internal thread) made of brass.
1.3 Functional Principle
The thin-film measuring cell has a thin-film resistor bridge at
which the measuring pressure p is transferred by a ceramic
diaphragm. The measuring cell output voltage is fed to an
amplifier and converted into an output current I
o
in the U/I output
stage.
The device is fed by power supply U
B
and reverse polarity and
too high a supply voltage are prevented by the protective diodes
at the input. The device is protected against high frequency
interference by an RF choke, capacitor and transorb diode
.
p Measuring pressure I
o
Output signal
U/I Output stage U
B
Power supply
U
const
. Constant voltage source
Figure 2 Transmitter Type 7MF1562, Function diagram
1.3 Technical Data
Functional principle and system
structure
Measuring principle Thin-film DMS
Input
Measuring variable Pressure
Measuring range see chapter 1.5
Output
Output signal 4 to 20 mA
Load (U
B
-10 V)/0,02 A
Characteristic linear increasing
Measuring accuracy
Measuring error (at 25°C,
characteristic deviation, hysteresis
and repetitive accuracy included)
0.5% of final value -
typical
Setting time T
99
< 0,1 s
Long-term drift
Start of scale 0.3% of final value/year –
typical
Span 0.3% of final value/year –
typical
Influence of ambient temperature
Start of scale 0.3%/10 K of final value
– typical
Span 0.3%/10 K of final value
– typical
Vibration influence 0.05 %/g to 500 Hz in all
directions (acc. to IEC
68-2-64)
Influence of power supply 0,01 %/V
Operating conditions
Ambient conditions
Ambient temperature
-25
°
C to +85
°
C
Storage temperature
-50 ° C to +100 ° C
Protection type (acc. to EN 60
529) IP65
Electromagnetic compatibility
Spurious emission
acc. to EN 50 081
Interference strength acc. to EN 50 082
Measuring medium conditions
Measuring medium temperature
-30 ° C to +120 ° C
Measuring medium pressure limit see chapter 1.5
Construction
Weight about 0.2 kg
Dimensions see fig. 3
Material of the parts which come into
contact with the measuring medium
Measuring cell AI
2
O
3
- 96 %
Process connection Brass, M-no. 2.0402
O-ring Viton
Material of the parts which do not
come into contact with the measuring
medium
Housing Brass, M-no. 2.0402
Connector Plastic housing, DIN 43
650, form A
Process connection G½A external thread
G½A internal thread
Electr. connection (DIN 43 650) Pg 9
Power supply
Terminal voltage at the transmitter 10 to 36 V DC
1.4 Ordering Data
Upper measuring
medium
pressure limit Order no.
7MF1562- _ _ _ 00+
Range Pressure *)
0 bis/to 16 bar
0 bis/to 25 bar 34 bar
70 bar
3CA
3CB
*) Please enter the values of this column at “_ _ _“ in the order number.