SENSORAY Model 7418/7419

SENSORAY Model 7418/7419
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Features

  • 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

The SENSORAY Models 7418/19 offer a cost-effective way to acquire sensor data for any STD 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 7418/19 adapter boards plug directly into any STD bus computer. Linearization, calibration, and sensitivity are software programmable, eliminating trim potentiometers 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.

SENSORAY Model 7418/7419 application

Calibration
Models 7418/19 automatically self-calibrate by measuring internal precision references. Reference data is stored in EEPROM so the adapter 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 downloaded.

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.

Specifications

Input resistance 100 MΩ
Maximum input voltage 63 VAC rms
CMMR 95 db/min
Maximum command mode ±5 V
A/D converter 16-bit integrating
Conversion time 22 ms/channel
A/D scan rate 45 samples/second
Operating temperature -25 to 70 °C
Interface STD 80
Input power 5 V (at 100 mA)
12 V (at 45 mA)
Dimensions (W x H): 4.40 x 6.90 inches
Sensor Types
Thermocouples J, K, T, S, E, B, N, C, R
Platinum RTD 100 Ω, types 385 and 392
Nickel RTD 120, 200, 1000 Ω
Copper 10 Ω
Thermistors 10000 Ω, YSI types 44006 or 44031
Strain gauges 120 to 4000 Ω
SensorResolutionRange
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