Setra 256 Data sheet
Model 256
Gauge Pressure Transducer
Ranges: 0-1 to 0-10000 PSI
0-1.6 to 0-700 BAR
Corrosive Liquids or Gases
Applications
● Process Control
● Chemical Processing
● Agricultural Irrigation
Systems
● Natural Gas Pipeline
Monitoring
● Grain Processing
● Industrial Pressure
Monitoring
Benefits
■ Low Cost
■ High Accuracy
■ NEMA 4/IP65
■ Wide Operating
Temperature Range
et ra’s Mod el 256 i ndustri al press ur e
transducer is one of the most rugged and
S
reliable sensors available. The Model 256 is
packaged in a die-cast aluminum enclosure that
is specifically designed for NEMA4/IP65 service.
Setra’s robust capacitive design is resistant to
environmental effects, such as shock, vibration,
temperature and EMI/RFI.
Superior mechanical and thermal stability is
achieved through Setra’s patented variable capacitance sensor. Its fundamentally simple
design features an insulated electrode plate in
close proximity to the sensor diaphragm, which
forms a variable capacitor. As pressure increases or
decreases, the capacitance changes. This change
Proof Burst
0-1 2 250
0-2 4 250
0-5 10 250
0-10 20 500
0-25 100 500
0-50 150 750
0-100 300 1000
0-200 400 2000
0-250 500 2000
0-500 1000 3000
0-1000 2000 5000
0-3000 4500 7500
0-5000 7500 10000
0-10000 12000 12500
Ranges
Pressure Pressure
159 Swanson Rd., Boxborough, MA 01719/Telephone: 978-263-1400/Fax: 978-264-0292
PSI Pressure
in capacitance is detected and converted to a linear
analog signal by Setra’s custom ASIC based circuit,
producing an output signal proportional to applied
pressure.
Available in a wide variety of gauge pressure ranges,
the 256 also features adjustable potentiometers
for zero and span settings.
Only 3.6” high x 4.0” wide, the Model 256 is
designed for compact installations. The removable cover provides easy access to the internal
terminal strip for wiring. Installation is quick and easy
with 1/2 inch internal threaded conduit ports for
electrical termination.
Proof Burst
Ranges
Pressure Pressure
0-1.6 6 40
0-4 10 50
0-6 18 60
0-10 30 80
0-16 32 130
0-25 50 170
0-40 80 240
0-60 120 300
0-100 200 400
0-250 380 550
0-400 600 800
0-700 800 1350
NOTE: Setra quality standards are based on ANSI-Z540-1.
The calibration of this product is NIST traceable.
U.S. Patent nos. 3859575, 4054833
Bar Pressure
■ Compatible with a
Wide Range of Gases
or Liquids
■ Corrosive Resistant All
Stainless Steel
Wetted Parts
■ Choice of Voltage or
Current Output
■ Operates on Low-
Cost Unregulated
Power Supply
When it comes to a product to
rely on - choose the Model 256.
When it comes to a company to
trust - choose Setra - an ESOP (Employee Owned) Company.
Certified
800-257-3872
Visit Setra Online:
http://www.setra.com
Model 256 Specifications
Performance Data
Ranges Ranges
25 PSI Less Than
and Higher 25 PSI
Accuracy RSS*
(at constant temp) ±0.13% FS ±0.25% FS
Non-Linearity, BFSL ±0.10% FS ±0.22% FS
Hysteresis 0.08% FS 0.10% FS
Non-Repeatability 0.02% FS 0.05% FS
Thermal Effects**
Compensated Range °F -4 to +176 -4 to +176
Compensated Range °C -20 to +80 -20 to +80
Zero Shift %FS/100°F ±1.0 ±2.0
Zero Shift %FS/50°C ±0.9 ±1.8
Span Shift %FS/100°F ±1.5 ±1.5
Span Shift %FS/50°C ±1.4 ±1.4
Long Term Stability 0.5% FS/YR 0.5% FS/YR
Warm-up Shift ±0.1% FS total ±0.1% FS total
*RSS of Non-Linearity, Hysteresis and Non-Repeatability.
*Units calibrated at nominal 70°F. Maximum thermal error computed from this datum.
Environmental Data
Temperature
Operating* °F (°C) -40 to +185 (-40 to +85)
Storage °F (°C) -40 to +185 (-40 to +85)
Shock 200g
Vibration 20g
Environmental Protection NEMA 4/IP65
*Operating temperature limits of the electronics only.
Pressure media temperatures may be considerably higher or lower.
Physical Description
Case Die-Cast Aluminum
Electrical Connections Two 1/2” internal conduit
ports
Pressure Fitting 1/4” NPT external
Weight 13.4 ounces
Pressure Media
Liquids or gases compatible with 17-4 PH Stainless Steel.*
*Note: Hydrogen not recommended for use with 17-4 PH Stainless Steel.
Specifications subject to change without notice.
Application of some available options may impact standard specifications.
Outline Drawings
1/2-14 NPT
5 TURNS MIN.
0.38
9
Electrical Data (Voltage)
Circuit 3-Wire (Exc, Out, Com)
Excitation 9 to 30 VDC
Output* 0.1-5.1 VDC for Ranges ≥ 25 PSI
Output Impedance 100 Ohms
Power Consumption 0.15 Watts
*Calibrated into a 50K ohm load, operable into a 5000 ohm load or greater.
**Zero output factory set to within ±25 mV.
**Span (Full Scale) output factory set to within ±50 mV.
Electrical Data (Current)
Circuit 2-Wire
Output* 4-20 mA for All Ranges
External Load 0 to 800 Ohms
Minimum supply voltage (VDC) = 9 + 0.02 x
(Resistance of receiver plus line).
Maximum supply voltage (VDC) = 30 + 0.004 x
(Resistance of receiver plus line).
*Calibrated at factory with a 24 VDC loop supply voltage and a 250 ohm load.
**Zero output factory set to within ±0.08 mA.
**Span (Full Scale) output factory set to within ±0.16 mA.
4.02
102
**
**
Example: Part No. 2561500PG2M11 for a 256 Transducer, 0 to 500 PSIG Range, 1/4” NPT Pressure Fitting, 4-20 mA Output.
2 5 6 1
5 0 0 P
Model
2561 = 256
While we provide application assistance on all Setra products, both personally
and through our literature, it is the customer’s responsibility to determine the
suitability of the product in the application.
001P = 1 PSI 1R6B = 1.6 Bar
002P = 2 PSI 004B = 4 Bar
005P = 5 PSI 006B = 6 Bar
010P = 10 PSI 010B = 10 Bar
015P = 15 PSI 016B = 16 Bar
025P = 25 PSI 025B = 25 Bar
050P = 50 PSI 040B = 40 Bar
100P = 100 PSI 060B = 60 Bar
150P = 150 PSI 100B = 100 Bar
200P = 200 PSI 160B = 160 Bar
250P = 250 PSI 250B = 250 Bar
500P = 500 PSI 400B = 400 Bar
600P = 600 PSI 700B = 700 Bar
10CP = 1000 PSI
30CP = 3000 PSI
50CP = 5000 PSI
10KP = 10000 PSI
2.00
51
Ranges
2.54
65
1.46
37
2.50
64
1/4” NPT
3.56
90
ORDERING INFORMATION
Code all blocks in table.
G
Pressure
G = Gauge
Pressure Fitting
Ranges < 25 PSI
2M = 1/4” NPT (Male)
1M = 1/8” NPT (Male)
Ranges ≥ 25 PSI
2M = 1/4” NPT (Male)
4M = 1/2” NPT (Male)
2F = 1/4” NPT (Female)
159 Swanson Road, Boxborough, MA 01719/Tel: 978-263-1400;
Toll Free: 800-257-3872; Fax: 978-264-0292; Email: sales@setra.com
Output
Ranges <25 PSI
11 = 4-20 mA
Ranges ≥ 25 PSI
11 = 4-20 mA
22 = 0.1-5.1 VDC
Please contact factory for versions not shown.
IN
MM
Optional
C = Calibration
Certificate
SSP256 Rev.H 02/16/10
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