Smart A/D

Model 618/19

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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, low-pass filtering, scan rate

Auto-calibration eliminates trimpots

Low power consumption

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Description
The Sensoray Models 618/19 offer a cost-effective way to acquire sensor data for any PCI bus system. They feature 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  618/19 adapter boards plug directly into any PCI bus computer. Linearization, calibration, and sensitivity are software programmable, eliminat- ing trim potentiometers and the need for board access. Sensor field wiring is accomplished with a 37-conductor flat cable and remotely mountable screw- termination board, either model 7409TB or model 7409TDIN with DIN rail mounting hardware.

Calibration
Models 618/19 automatically self-calibrate by measuring internal precision references. Reference data is stored in EEPROM so the adapter

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board 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.

Software
The included SDK18 software has a DLL for Windows 95/98/NT.

A ready-to-go data acquisition program, QuickSense, is available as an option.

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General Specifications

 

Input resistance

1000 M ohms

Max input voltage

63 VAC rms

CMMR

95 dB min

Max common mode

+/-5 volts

A/D converter

16-bit integrating

Conversion time

22 mS per channel

A/D scan rate

45 samples/sec

Operating temperature

-25C to 85C

Bus interface

PCI

Input power

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 ohms, type 385 & 392

Nickel RTD

120, 200, 1000 ohms

Thermistors

10000 ohms, YSI type
44006 or 44031

Strain gauges

120 to 4000 ohms

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Sensor

 Resolution

 Range

Thermocouples
(all types)

0.1C

-270C to 1760C

Thermistors

0.01C

-55C to 145C

Resistors

0.02 ohm
0.125 ohm
31 ohms

0 to 400 ohms
0 to 3 kohm
s0to 600 kohms

RTD's

0.05C
0.0125C

-200C to 800C
0C to 400C

Strain/pressure

5 uV

+/-100 mV

DC voltage

5 uV
20 uV
200 uV

+/-100 mV
+/-500 mV
+/-5 V
 

Current loop

0.01%

4 to 20 mA

Odering Information

Model

8 channel Smart A/D

618

16 channel Smart A/D

619

Small termination board

7409TB

Large termination board

7409TC

7409TC with DIN mounting

7409TDIN

18" interconnect cable

7409C

1 meter interconnect cable

7409C1

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Sensor connector pinout

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Sensor definition codes

Sensor type

Code

Sensor type

Code

Voltage

 

Thermocouples

 

 100 mV

17H

E

01H

    500 mV

16H

J

1BH

  5 V

15H

K

1CH

Resistance 

 

T

1DH

400 ohms

0AH

S

1EH

3k ohms

14H

R

1FH

600 k ohms

20H

N

22H

Custom resistive sensor

0CH

C

23H

RTD

 

B

24H

100 ohm Pt  385 0.05 C/bit

18H

Current loop

 

100 ohm Pt 385 0.0125 C/bit

2AH

4-20 mA

11H

100 ohmPt 392 0.05 C/bit

19H

Thermistor

 

100 ohm Pt 392 0.0125 C/bit

2BH

 YSI 44031, 10 k ohm

1AH

10 ohm Cu

2CH

Pressure/strain

 

120  ohm T/R 2

21H

> 120 ohm  full bridge

0FH

200 ohm

28H

   

1000 ohm

20H

   
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