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Description
The Sensoray Models 418/19 offer a cost-effective way to acquire sensor data for any
ISA bus system. They features 16-bit resolution from 8 or 16 channels, each individually
programmable for a different sensor type. Analog- to-digital conversion is performed in
under 22 milliseconds, providing 45 channels per second scan rate.
The 418/19 adapters plug directly into any half slot ISA
computer. Linearization, calibration, and sensitivity are software program- mable,
eliminating trim potenti- ometers 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. |
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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
RTDs, thermistors, and resistors are eliminated with the use of a four-wire circuit.
An on-board microprocessor continually scans the active sensor
channels. Each channel is amplified, digitized, filtered, converted to engineering units,
and stored in on-board memory. This process is independent of host CPU activity. |
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