Sensoray Products

Esis Pty Ltd - Australia - Ph 02 9481 7420  Fax 02 9481 7267  www.esis.com.au 
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Note: Sensoray products are not C-Tick approved for use in Australia.

Thay can be used in Australia provided C-Tick approval is achieved for the equipment containing the Sensoray product.

Features
Supports thermocouples. RDT's,
strain gauges, voltage inputs,
4-20 mA, thermistors, and
resistors

8 channels of 16-bit A/D resolution

Each channel is software programmable
for sensor type and gain

Auto-calibration eliminates trimpots

PC/104 compatible

 Sensoray (US web site) many industrial computer cards

Description
The Sensoray Model 518 Smart A/D offers a cost-effective way to acquire sensor data for any PC/104 bus system. It features 16-bit resolution from eight input channels, each individually programmable for a different sensor type. Analog-to-digital conversion is performed in under 22 milliseconds, providing a 45 channel per second scan rate.

The 518 board plugs directly into any PC/104 bus slot. Lin- earization, calibration, and sensitivity are software- pro- grammable, eliminating trim potentiometers and the need for board access. Sensor field wiring is accomplished with a 40- conductor flat cable and remotely mountable screw- termination board, either Model 7409TB or Model 7409TDIN with DIN rail mounting hardware.

Calibration
The 518 automatically self-calibrates by measuring internal references. Reference data is stored in an EEPROM so that boards may be easily inter-changed. Signal conditioning is provided

for thermistors, RTD's strain and pressure, resistance and voltage inputs. Standard correction for non-linear sensors is built in. Custom compensation can be downloaded.

Excitation
A pulsed constant-voltage source is provided for strain and pressure sensors. A pulsed constant-current source is provided for resistive sensors. Lead loss errors from RTD's, thermistors, and resistors are eliminated with the use of four-wire circuits.

An on-board micro-processor continually scans the active sensor channels. Each channel is amplified, digitized, filtered, converted to engineering units, and stored in on-board memory independent of the host CPU activity.

The Model 518 uses two consecutive I/O ports between hex addresses O and FF.