High Purity Pressure Transducer – Model 224



Setra’s Model 224 ultra-high purity pressure transducer is designed for the most demanding specialty gas monitoring and control applications, where construction integrity, purity and performance cannot be sacrificed.

The 224 has a small, streamlined sensor chamber for easy purgeability. The sensor is designed to provide superior mechanical and thermal stability, especially in transient  temperature conditions resulting from flowing gases. Isolation of the sensing element from the pressure

In a typical Setra configuration, a compact housing contains two closely-spaced, parallel, electrically-isolated metallic surfaces, one of which is essentially a diaphragm capable of slight flexing under applied pressure. The diaphragm is constructed of low-hysteresis material such as 17-4 PH SS or a proprietary compound of fused glass and ceramic (Setraceramâ„¢). These firmly secured surfaces (or plates) are mounted so that a slight mechanical flexing of the assembly, caused by a minute change in applied pressure, alters the gap between them (creating, in effect, a variable capacitor). The resulting change in capacitance is detected by a sensitive linear comparator circuit (employing proprietary, custom-designed ASICs), which amplifies and outputs a proportional, high-level signal.



  • Superior stability avoids downtime
  • EMI/RFI immunity prevents false shutdown
  • Sturdy design allows trouble-free installations
  • Minimal torque effect
  • High burst pressure ratings
  • Easy purgeability
  • Virtually insensitive to thermal transients in flow stream
  • Optional UL 1604 and ATEX 94/9/EC approval available for 4 to 20 mA output units
  • Meets CE conformance standards


  • High Purity Gas Delivery Systems
  • Semiconductor Process Tools
  • Pharmaceutical & Biotech Process
  • Gas Cabinets Benefits


Technical Details
Performance Data
Accuracy RSS* (at constant temp) ±0.25% FS or
±1.0% of Reading
Non-Linearity, (BFSL) ±0.15% FS
Hysteresis 0.20% FS
Non-Repeatability 0.02% FS
Thermal Effects
Compensated Range °F(°C) +15 to +150 (-9 to +65)
Zero Shift %FS/100°F(%FS/50°C) 2.0 (1.8)
Span Shift %FS/100°F(%FS/50°C) 2.0 (1.8)
Warm-up Shift 0.1% FS Total
* RSS of Non-Linearity, Non-Repeatability and Hysteresis.Environmental Data
Environmental Data
Operating* °F (°C) -40 to +185 (-40 to +85)
Storage °F (°C) -40 to +185 (-40 to +85)
Current Unit Ordered w/Option N1
Operating °F (°C) -22 to +176 (-30 to +80)
Storage °F (°C) -22 to +176 (-30 to +80)
*Operating temperature limits of the electronics only.
Pressure media temperature may be considerably higher or lower.
Physical Description
Case Stainless Steel
Electrical Connection 6ft. Multiconductor Cable,
Bayonet Connector or D-Sub
Pressure Fittings See Ordering Matrix in the Catalogue
Zero/Span Adjustments Top Access
Weight (Approx.) 6 ounces (170 grams)
Electrical Data (Voltage)
Circuit 3-Wire (Exc, Out, Com)
Excitation 10 to 30 VDC for 5V FSO
13 to 30 VDC for 10V FSO
Output* 0 to 5VDC or 0.2 to 5.2VDC**
0 to 10VDC or 0.2 to 10.2VDC**
Current Consumption <8 mA
*Calibrated into a 50K ohm load, operable into a 5000 ohm load or greater
**Zero output factory set to within ±25mV (for 5 VDC output) or ±50mV (for 10 VDC output)
**Span (Full Scale) output factory set to within ±25mV (for 5 VDC output) or ±50mV (for 10 VDC output)
Electrical Data (Current)
Circuit 2-Wire
Output* 4 to 20 mA**
External Load 0 to 800 ohms
Minimum Supply Voltage (VDC) = 10 + 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 ±.08mA
**Span (Full Scale) output factory set to within ±.08mA
Pressure Media
Liquids or gases compatible with 316L Stainless Steel.
Non-Incendive: Certified for use in potentially hazardous locations:

North America:
Optional UL 1604 approval available for units
ordered with 4 to 20 mA current output. (Select N1 Option)

Optional ATEX 94/9/EC approval available for units ordered with 4 to 20 mA current output. (Select N1 Option)

Note: Specification are subject to change without notices.

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