Model 118 | 8-channel smart sensor interface

Model 118 8-channel smart sensor interface
  • Measures thermocouple, RTD, strain gage, voltage, 4-20 mA, thermistor, and resistance
  • 8 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

Model 118 is a legacy product and is not recommended for new designs. Legacy products are available but may have lead times up to 12 weeks and minimum order requirements. Use our Product Finder to find a comparable product or contact our Design Support Team.

Description

Model 118 is an 8-channel Smart A/D that offers a cost-effective way to acquire sensor data for any VME 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.

An on-board microcontroller continually scans the sensor channels. Each channel is amplified, digitized, filtered, linearized, converted to engineering units, and stored in on-board memory so it can be instantly read by the host. Signal conditioning is provided for thermistors, RTD's, strain and pressure gauges, and resistance measurements. Standard corrections for non-linear sensors is built in.

A pulsed excitation source is provided for passive resistive sensors to minimize sensor self-heating. Lead loss errors from RTD's, thermistors, and resistors are eliminated with the use of four-wire circuits.

The board periodically samples internal reference standards and uses the sample data to correct offset and gain errors. Factory-calibration data is stored in an EEPROM so that boards may be easily interchanged. Calibration is fully electronic, thereby eliminating trimpots and the need for board access during recalibration.

The 118 board is available with 3U and 6U front panels. Sensor field wiring is accomplished with a 40-conductor flat cable and a remotely mountable screw-termination board.

Example application using external 7409TB breakout board

118_example_app.gif

Specifications

Input resistance100 MΩ
Maximum input voltage63 VAC rms
CMRR95 db/min
Maximum command mode±5 V
A/D converter16-bit integrating
Conversion time22 ms/channel
A/D scan rate45 samples/second
Operating temperature-25 to 85 °C
VME interfaceA16, D8
Input power5 V (at 100 mA)
12 V (at 35 mA)
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
Thermistors10 KΩ, YSI type 44006 or 44031
Strain gauges120 to 4000 Ω
Thermocouples 0.1 °C °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

Documentation

File Version Type Size
Model 118 Instruction Manual1.0.0PDF304 KB

Downloads

File Version Type Size
Smart A/D Software Development Kit1.0.2ZIP243 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.
118-3UVME 8-channel smart sensor interface, 3UCallCall 
118-6UVME 8-channel smart sensor interface, 6UCallCall 
Termination boards
7409TBBreakout board, 40-pin, with temperature sensor$67$61
7409TCBreakout board, 40-pin, with temperature sensor and prototyping area$106$96
7409TDINBreakout Board, 40-pin, with temperature sensor and prototype area, DIN mountable$141$126
Cables
7409CCable, flat, 40 conductor, 18 inches$20$19
7409C1Cable, flat, 40 conductor, 1 meter$29$26

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