The MEADS pressure transducers are manufactured by Stellar Technologies, Inc. and are derivatives of off-the-shelf transducers. They are strain gage-type transducers with a range from 0 to 5 psia, outfitted at the manufacturer with flight electrical connectors, pressure input fittings, and mounting brackets. The transducers are not thermally compensated and they contain no electronics (electronics functions are performed by the SSE.) The transducers were calibrated with the SSE, as a subsystem, in combination with thermal/vacuum qualification at Langley. The calibration coefficients from this testing were then used to convert millivolts to pressures when the MEADS flight data was obtained. All of the hardware-related uncertainties were used in an error budget to ensure that the MEADS subsystem would meet the science objectives listed above.4
The Series FT290 pressure transducers are designed for those applications requiring both a standard NPTmale process connection and a flush diaphragm with zero dead volume. These pressure sensors are designed with a unique diaphragm design which reduces stress levels caused by torquing a tapered thread into the mating fitting. Besides their small size (only 3.5 oz.), these pressure sensors are constructed of all welded stainless steel and can withstand demanding application environments.
The FT290 covers ranges from 2,000 to 10,000 psia/psig and provides 3mV/V full scale output with 10vdc excitation. Static accuracy is ±0.25% (BFSL). The operating temperature is -100°F to +300°F, and the compensated temperature range is from -65°F to +250°F.
Stellar Technology’s Model PT36XX subsea wellbore pressure and temperature transducer delivers long-term performance in harsh subsea oil and gas exploration environments. It has a total error band of ±1% of full scale output and is designed for working pressures to 15,000 psi and seawater depths to 17,000 ft. Both temperature and pressure sensors are located at the flush-end of the wellbore probe, a design feature that improves dynamic response and alleviates clogging.
Stellar Technology’s Model GT100 is a robust, heavy duty pressure transducer designed as a solution to severe applications like rocket engine testing that can ruin a typical pressure sensor. Model GT100 features a cleanable pressure cavity and a stainless steel diaphragm which can be replaced in the field as needed, renewing the sensor in just a few minutes.
The GT100 has a standard output of 3mV/V and delivers linearity and hysteresis of 0.25% across pressure ranges from 150 psig to 20,000 psig. Exceptional thermal isolation ensures reliable performance over an operating temperature of -100°F to +300°F. The compensated temperature range is -30°to +170°F, which can be extended to -65°to +250°F.
Stellar Technology’s Series GT320 and GT32XX pressure transducers incorporate a proprietary sensor design with innovative electronics to provide a new high pressure/fatigue rated pressure transducer with a standard accuracy of 0.25% and upgraded accuracy of 0.1%.
With pressure ranges from 20,000 psi to 100,000 psi, the Series GT320 and GT32XX transducers are ideal for high cycle applications as well as ultra-high pressure applications. The GT320 offers mV/V output and the GT32XX series provides high level current or voltage outputs as well as digital outputs including CANbus, RS232 and RS485.
Stellar Technology Inc, offers the new Model FT29XX amplified pressure transducer. This rugged all-welded stainless steel sensor combines a standard NPTmale process connection with a flush diaphragm. In addition, the FT29XX pressure transmitter is designed with internal signal conditioning. Customers can select 4-20mA current outputs, numerous voltage outputs, as well as digital outputs including RS232, RS485, and CANbus. The unique design of the isolation diaphragm reduces stress levels normally caused by torquing a tapered thread into the mating fitting. The FT29XX introduces zero dead volume to the fixturing and resists the accumulation of residue that can clog traditional pressure ports. The sensing element is machined from a single piece of steel, making the FT29XX insensitive to shock and vibration. This unit is ideal for metering and dispensing operations, for the application of sealants and paints, or anywhere a flush diaphragm unit is desired.
The Series FT31XX clean-in-place (CIP) pressure transmitters are designed specifically to meet the rigorous demands of the wet and hostile environments of industrial process applications that use a flush diaphragm and Tri-Clover flange clamps. These pressure transmitters incorporate a one-piece, non-welded diaphragm for reliable performance and long life in process applications such as homogenizers, heat exchangers, filters, pasteurizers, emulsifiers, surge tanks, and biopharmaceutical mixers. In addition, the FT31XX design does not use an oil fill, thus eliminating the possibility of process contamination.