High Purity Pressure Transducer – GCT 225
Setra’s Model GCT-225 Series is idealfor pressure measurement applications that require exceptional insensitivity to environmental extremes. The GCT-225 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 GCT-225 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