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ESP-16HD | 32HD | 64HD Miniature Electronic Pressure ScannersMiniature ESP electronic pressure scanners are differential pressure measurement units consisting of an array of silicon piezoresistive pressure sensors, one for each pressure port. |
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ESP Features
ESP Applications
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The sensors are mounted on a common hybrid glass substrate using a proprietary technique which maximizes long term stability. The outputs of the sensors are electronically multiplexed through a single onboard instrumentation amplifier at rates up to 20,000 Hz using binary addressing. The multiplexed amplified analog output is capable of being driven through long lengths of cable to a remote A/D converter. The ESP scanners also incorporate a two position manifold actuated by momentary pulses of control pressures. When placed in the calibrate position, all sensors are connected to a common calibration pressure port. A series of accurately measured pressures can be applied through this port to characterize the sensors, in place, at the condition to which they are being subjected. Proper and periodic on-line calibration maintains static errors within +/-0.05% or better of the full scale (FS) pressure range. The calibration manifold automatically switches between two common reference pressures to ensure a stable reference is applied during calibration. The calibration manifold incorporates a visual position indicator and utilizes a dynamic o-ring seal design for high reliability and easy servicing in the field. Options include purge capability, isolated from the pressure sensors, to clear measurement lines of moisture and contamination as well as to prevent closure of model pressure taps during application of pressure sensitive paint. Other options include a nickel foil RTD output to monitor internal scanner temperature and Digital Temperature Compensation (DTC) technology. (See Supplement #ESP001 for new Gen-2 ESP-32DTC information.) The Digital Temperature Compensation option incorporates the latest PSI innovations in ESP technology including temperature signal outputs from each silicon pressure sensor, embedded EEPROM retaining factory calibration information including temperature characteristics, programmable dual gain amplifier with optional dual range calibration, calibration manifold position sensing, and internal sensor excitation regulation with sense output. The DTC Series of ESP scanners are supported by the SDI configuration of PSI's System 8400 or PSI’s DTC Initium System to dramatically reduce calibration requirements and improve accuracy to as much as ±0.03% FS.
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