Pressure

74
Pressure transmitters
for liquid and gaseous media
Type series SN 3
Pressure transmitters, piezoresistive, 3-conductor system
Type series SN…311
2 output signals
0–10 V and 4–20 mA
The nominal ranges of types SN…311 mentioned
in the Product Summary below can be
limited by 50% of the nominal range via setting
potentiometers of the evaluation electronics. The
smallest settable operating range is indicated in
column 2 of the Product Summary. The zero
point can likewise be shifted by 50% of the
nominal range.
Inversion of output signal possible on SN…-311
and …-395.
Technical data
Product Summary
Pressure connection G 1/2 external, wrench
size 27
Cable entry 2 x Pg 9
Degree of protection IP 65
Mounting
Directly on pressure
line
Materials
Sensor housing:
1.4571
Pressure diaphragm:
1.4435
Terminal housing:
Makrolon
Service life 100m cycles (typical)
Dimensions See page 73.
Operating voltage 24 V AC ± 20% or 24
V…36 V DC
Power consumption max. 1 W
Synchronization error max. ± 0.3% FS
of voltage and
current output
on SN 311
Load impedance
0–10 V impedance
> 10 kOhm
4–20 mA impedance
650 Ohm
max. ± 0.5% FS
max. ± 0.1% FS
max. ± 0.5% FS
Linearity error
Hysteresis
Temperature
hysteresis
Reproducibility max. ± 0.1% FS
Overall accuracy 1%
Medium temperature –30 to 100°C
Compensated range 0–100°C
Temperature drift max. ± 0.04% FS/K
Ambient temperature 0–50°C
Inversion of On SN…311
output signal and SN 395
LED digital display Powered via
(optional)
transmitter.
AZ 331
No separate supply
needed.
Operating range Smallest settable Max. permissible Type
(nominal range) operating range pressure
(bar) (bar) (bar)
2 output signals 0–10 V and 4–20 mA terminal connection, range adjustable
0 – 0.25 0.125 0.75 SN 025-311
0 – 0.6 0.3 1.8 SN 06-311
0 – 1 0.5 3 SN 1-311
0 – 2.5 1.25 7.5 SN 3-311
0 – 6 3 18 SN 6-311
0 – 10 5 30 SN 10-311
0 – 25 12.5 70 SN 25-311
0 – 40 20 80 SN 40-311
Output signal 0–10 V plug connection, range adjustable via jumpers (50%, 20%)
0 – 0.25 0.05 0.75 SN 025-395
0 – 0.6 0.12 1.8 SN 06-395
0 – 1 0.2 3 SN 1-395
0 – 2.5 0.5 7.5 SN 3-395
0 – 6 1.2 18 SN 6-395
0 – 10 2 30 SN 10-395
0 – 25 5 70 SN 25-395
0 – 40 8 80 SN 40-395
Connection scheme SN…311 Connection scheme SN 395
Type series SN…395
Output signal 0–10 V
Not adjustable, inversion not
possible. Plug connection
(digital display AZ 331)
s
Degree of protection:
IP 65