Smart A/D

Model 418/19

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Model 418/19

Features
Supports thermocouples, RTD’s, strain gauges, voltage in, 4-20 mA, thermistors, and resistors

Up to 16 differential input channels plus sensor excitation

Each channel is software programmable for sensor type, gain.

Auto-calibration eliminates trimpots

Low power consumption

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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.

Calibration
Models 418/19 automatically self- calibrate by measuring internal precision references. Reference data is stored in EEPROM so the

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adapter boards may be easily interchanged. Signal conditioning is provided for thermistors, RTD’s, thermocouples, strain and pressure, resistance and voltage inputs. Standard correction for nonlinear sensors is built in. Custom compensation can be down loaded.

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 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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General Specifications

Input resistance

Max input voltage

CMMR

Max common mode

A/D converter

Conversion time

A/D scan rate

Operating temperature

PC ISA interface

Input power

1000 MW

63 VAC rms

95 dB min

+/-5 volts

16-bit integrating

22 mS per channel

45 samples/sec

-25C to 85C

2 I/O ports

5 volts at 100 mA
12 volts at 35 mA

Sensor Types
Thermocouples J,K,T,S,E,B,N,C,R
Platinum RTD 100 W, type 385 & 392
Nickel RTD 120 W, 200 W, 1000 W
Thermistors 10000 W, YSI type
44006 or 44031
Strain gauges 120 W to 4000 W
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Sensor

 Resolution

 Range

Thermocouples

0.1C

-270C to 1760C
Thermistors

0.01C

-55C to 145C
Resistors

0.02W
0.125W
31W

0 to 400W
0 to 3 kW
0to 600 kW
RTD’s

0.05C
0.0125C

-200C to 800C
0C to 400C
Strain/pressure

5mV

+/-100 mV
DC voltage

5 mV
20
mV
200
mV

+/-100 mV
+/-500 mV
+/-5 V
+/- 10 V
Current loop

0.01%

4 to 20 mA

Odering Information Model

8 channel Smart A/D

16 channel Smart A/D

Small termination board

Large termination board

7409TC with DIN mounting

18” interconnect cable

1 meter interconnect cable

418

419

7409TB

7409TC

7409TDIN

7409C

7409C1

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