Miniature ESP electronic pressure scanners are differential pressure measurement units consisting of an array of silicon piezoresistive pressure sensors, one for each pressure port. The sensors are mounted on a common hybrid glass substrate using a proprietary technique which maximizes long term stability. The outputs of the sensors can be electronically multiplexed through a single onboard instrumentation amplifier at rates up to 20,000 Hz using binary addressing. The multiplexed amplified analogue 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% 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 for use with the SDI configuration of PSI's System 8400 which reduces calibration requirements by up to 90%.

The DTC 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, calibration manifold position sensing and internal sensor excitation regulation with sense output.

The ESP scanners can be used with CANdaq, Initium and the PSI 8400 system.

• Unparalleled Long Term Stability
• Individual Offset and Thermal Zero Compensation
• Automatically Switched Reference Pressures
• Optional Isolated Purge Capability
• Optional Temperature Sense Output
• Optional Digital Temperature Compensation(DTC)
• New 4" water (1.0Kpa) range available.
• In-Model Windtunnel Testing
• Aircraft Flight Testing
• Automotive Track Testing