8/16-channel smart sensor interface | Model 618/619

Model 618 8/16-channel smart sensor interface
  • Measures thermocouple, RTD, strain gage, voltage, 4-20 mA, thermistor, and resistance
  • 8 or 16 sensor channels with differential inputs
  • Provides excitation to passive sensors
  • Pulsed sensor excitation minimizes sensor self-heating
  • Cold-junction compensation for thermocouples
  • Each channel configurable for any supported sensor type
  • Fully electronic calibration


Sensoray models 618 and 619 offer an easy and 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 different sensor types.

An on-board microcomputer continually scans the active sensor channels. Each channel is amplified, digitized, filtered, linearized, converted to engineering units, and stored in on-board memory, all independent of host CPU activity. Analog to digital conversion is performed in under 22 milliseconds, providing 45 channels per second scan rate.

A pulsed constant-voltage source is provided for strain and pressure sensors, and a pulsed constant-current source is provided for resistive sensors, thus minimizing sensor self-heating. Lead loss errors from RTD's, thermistors, and resistors are eliminated with the use of a four-wire circuit.

The boards plug directly into standard PCI bus slots. 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.

Model 618 Application



Precision reference standards are periodically sampled and used to eliminate gain and offset errors from sensor measurements. Signal conditioning is provided for thermistors, RTD's, thermocouples, strain and pressure, resistance and voltage inputs.

Calibration data is stored in EEPROM so the adapter board may be easily interchanged. Calibration is fully electronic — physical trimpots have been eliminated, along with the need for board access during recalibration


Analog inputs
Differential input rangeNormal operation: ±5 V
Absolute maximum: 63 VAC rms, 2 seconds max.
CMMR95 db/min
Input resistance1000 MΩ
A/D converter16-bit integrating
Conversion time22 ms/channel
A/D scan rate45 samples/second
Sensor Types
ThermocouplesJ, K, T, S, E, B, N, C, R
Platinum RTD100 Ω, types 385 and 392
Nickel RTD120, 200, 1000 Ω
Copper10 Ω
Thermistors10000 Ω, YSI type 44006 or 44031
Strain gauges120 to 4000 Ω
Mechanical and Environmental/th>
Bus interfacePCI
Input Power5 V (at 100 mA)
12 V (at 35 mA)
Operating temperature-25 to 85 °C
Sensor Resolution Range
Thermocouples 0.1 °C -270 to 1760 °C
Thermistors 0.01 °C -55 to 145 °C
Resistors 0.02 Ω
0.125 Ω
31 Ω
0 to 400 Ω
0 to 3 kΩ
0 to 600 kΩ
RTDs 0.05 °C
0.0125 °C
-200 to 800 °C
0 to 400 °C
Strain/pressure 5 µV ±100 mV
DC voltage 5 µV
20 µV
200 µV
±100 mV
±500 mV
±5 V


File Version Type Size
Model 618/619 Instruction Manual1.0.0PDF127 KB
Model 618/619 Register Architecture1.0.0PDF9 KB


File Version Type Size
Smart A/D Software Development Kit
Production version for Windows XP, 7 and 10
1.1.1ZIP10.14 MB
Smart A/D Software Development Kit
Legacy version for Win2000 and XP
1.0.2ZIP243 KB
Other Operating Systems
Need a software development kit for another operating system? We can port our SDK to
your OS or provide the information you need to do it yourself. Contact Sales for details.

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
6188-channel smart sensor interfaceCallCall 
61916-channel smart sensor interfaceCallCall 
Breakout and termination boards
7506TDINBreakout board, 40-pin, DIN rail mountable$85$78
7409TBBreakout board, 40-pin, with temperature sensor$72$65
7409TCBreakout board, 40-pin, with temperature sensor and prototyping area$113$103
7409TDINBreakout Board, 40-pin, with temperature sensor and prototype area, DIN mountable$151$135
7409CCable, flat, 40 conductor, 18 inches$21$20
7409C1Cable, flat, 40 conductor, 1 meter$31$28

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