High Purity Pressure Transducer
Setra’s Model GCT225 Series is ideal for pressure measurement applications that require exceptional insensitivity to environmental extremes. The GCT225 is insensitive to factors such as torque effect on the fitting, temperature transients, and RFI effects generated by other instruments and equipment.
Designed with a low cavity volume of 0.11 in3, the GCT225 can be easily purged. All wetted parts are high quality VAR 316L SS, electropolished to 7 Ra (10 max.) finish, and every sensor is mass spectrometer helium leak tested to 1 x 10-9 ATM.CC/sec.
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 installation
- Meets CE conformance standards
- Gas Cabinets
- High Purity Gas Delivery Systems
- Semiconductor Process Tools
|Accuracy* RSS (At Constant Temp.)||±0.25% FS|
|Non-Linearity, BFSL||±0.15% FS|
|Compensated Range °F(°C)||0 to +150 (-18 to +65)|
|Zero/Span Shift %FS/°F(°C)||0.033 (0.06)|
|Maximum Line Pressure||2.0 (1.8)|
|Overpressure||Mass Spectrometer Helium Leak|
Tested to 1 x 10-9 ATM CC/Sec.
|* RSS of Non-Linearity, Non-Repeatability and Hysteresis.|
**Units calibrated at nominal 70°F. Maximum thermal error computed from this datum.
|Electrical Connection||6ft./1.8m Multiconductor|
Cable or 4-Pin Bayonet Connector
|Pressure Fitting||#4 Face Seal Swivel Male or Female, 1/4″ NPT Male, or Tube Stub|
|Internal Cavity Volume||0.11 in.3|
|Wetted Material||VAR 316L SS Electropolished to|
7 RA (10 max.) Finish
|Weight (Approximate)||4 ounces (113 grams)|
|Operating* °F (°C)||-40 to +185 (-40 to +85)|
|Storage °F (°C)||-40 to +185 (-40 to +85)|
|*Operating temperature limits of the electronics only. |
Pressure media temperatures may be considerably higher or lower.
Note: Specification are subject to change without notice