Product specifications

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DIFFERENTIAL PRESSURE
80
Model 256
Pressure Transducers

■ Low Cost
■ High Accuracy
■ 
■ 
■ 
Liquids
■ 
Parts
■ 
■ Operates on Low Cost Unregulated Power Sup-
ply
■ Meets CE Conformance Standards
APPLICATIONS
■ Process Control
■ Chemical Processing
■ Agricultural Irrigation Systems
■ Natural Gas Pipeline Monitoring
■ Grain Processing
■ Industrial Pressure Monitoring

The calibration of this product is NIST traceable.
U.S. Patent nos. 6019002; 6014800
DESCRIPTION
The Model 256 is one of the most rugged and reliable sensors avail-

is packaged in a die-cast aluminum enclosure and includes Setra’s
robust capacitive design, making it resistant to environmental ef-

Available in a wide variety of gauge pressure ranges, the 256 fea-
tures adjustable potentiometers for zero and span settings.
Only 3.6” high x 4.0” wide, the Model 256 is designed for com-
pact installations. The removable cover provides easy access to the
internal terminal strip for wiring. Installation is quick and easy with
-
tion.
GAUGE PRESSURE
SPECIFICATIONS
Performance Data Environmental Data Electrical Data (Voltage)
Ranges Ranges
Operating
3
Temperature °F (°C) -40 to + 185 (-40 to +85) Circuit 3-Wire (Exc, Out, Com)
25 PSI & Higher Less than 25 PSI
Storage Temperature °F (°C) -40 to + 185 (-40 to +85) Excitation 9 to 30 VDC
Accuracy RSS
1
(at constant temp)
2
±0.13% FS ±0.25% FS
Shock
6
200g Output
5
0.1 to 5.1 VDC for Ranges ≥ 25 PSI
6
Non-Linearity, BFSL ±0.10% FS ±0.22% FS
Vibration
7
20g Output Impedance 100 ohms
Hysteresis 0.08% FS 0.10% FS
Environmental Protection NEMA 4/IP65 Power Consumption <0.15 watts (approx. 5mA @ 24 VDC)
Non-Repeatability 0.02% FS 0.05% FS
Physical Description Electrical Data (Current)
Thermal Eects
Case Die Cast Aluminum Circuit 2-Wire
Compensated Range °F -4 to +176 -4 to 176
Electrical Connections Two 1/2” Internal Conduit Ports Output
7
4 to 20mA
8
for All Ranges
Compensated Range °C -20 to 80 -20 to ±80
Pressure Fittings 1/4” NPT External External Load 0 to 800 ohms
Zero Shift %FS/100°F 1.0 1.0
Weight (approx.) 13.4 Ounces Minimum supply voltage
(VDC)
9 + 0.02 x (Resistance of receiver plus line).
Zero Shift %FS/100°C ±0.9 ±1.8
Pressure Media
Maximum supply voltage
(VDC)
30 + 0.004 x Resistance of receiver plus line).
Span Shift %FS/100°F 1.5 ±1.5
Liquids and gases compatible with 17-4 PH Stainless Steel.
4
1 RSS of Non-Linearity, Hysteresis, and Non-Repeatability.
2. Units calibrated at nominal 70°F. Maximum thermal error computed from this datum.
3. Operating temperature limits of the electronics only. Pressure media temperature may be considerably
higher or lower.
4 Note: Hydrogen not recommended for use with 17-4 PH Stainless Steel.
Specications subject to change without notice.
5. Calibrated into a 50K ohm load, operable into a 5000 ohm load or greater.
6. Zero output factory set to within ±25 mV.
Span (Full Scale) output factory set to within ±50 mV.
7. Calibrated at factory with a 24 VDC loop supply voltage and a 250 ohm load.
8. Zero output factory set to within ±0.08 mA
Span output factory set to within ±16 mA
Span Shift %FS/100°C 1.4 ±1.4
Environmental Protection Weather Resistant
Long Term Stability 0.5% FS/YR 0.5% FS/YR
Physical Description
Warm-up Shift 0.1% FS Total 0.1% FS Total
Case Stainless Steel & Valox