Pressure Measurement

High Purity Pressure Transducer

Model 224

model 224 high purity pressure transducer transmitter


Setra Model 224 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.

Model 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, Model 224 Pressure Transducer has a compact housing that 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 (Setraceram). 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.

  • Model 224 High Purity Pressure Transducer has Superior stability to avoid downtime
  • EMI/RFI immunity prevents false shutdown
  • Sturdy design allows trouble-free installations
  • Minimal torque effect
  • High burst pressure ratings
  • Easy purge-ability
  • 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
Model 224 High Purity Pressure Transmitter is used in the following applications:
  • 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
Hysteresis0.20% FS
Non-Repeatability0.02% 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 Shift0.1% FS Total
* RSS of Non-Linearity, Non-Repeatability and Hysteresis.

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

CaseStainless Steel
Electrical Connection6ft. Multiconductor Cable,
Bayonet Connector or D-Sub
Pressure FittingsSee Ordering Matrix in the Catalogue
Zero/Span AdjustmentsTop Access
Weight (Approx.)6 ounces (170 grams)

Electrical Data (Voltage)

Circuit3-Wire (Exc, Out, Com)
Excitation10 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)

Output*4 to 20 mA**
External Load0 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.