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Model 7418/7419 Analog to Digital Converter
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

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 748/19 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.

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 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.

Application Notes
Thermocouples | Lead loss errors | Typical sensor connections

Software and Manuals

The included SDK18 (32-bit DLL) software has a DLL for Windows 95/98/N.
A ready-to-go data acquisition program, QuickSense, is available as an option.

7418 Instruction Manual Released 2/1/99
7419 Instruction Manual Released 2/1/99
Software Development Kit (32-bit DLL) Released 5/1/03
QuickSense software Manual Released 12/15/99
QuickSense software option Please call 503-684-8005

Specifications

Input resistance 100 Megohms
Max. input voltage 63 VAC rms
CMMR 95 db min
Max. command mode +/- 5 volts
A/D converter 16-bit integrating
Conversion time 22 mS per channel
A/D scan rate 45 samples/sec
Operating temperature -25°C to 70°C
Interface STD 80
Input power 5 volts at 100 mA | 12 volts at 45 mA
For Sensor Types, Resolution, Range and Codes click here
Sensor connector pinout

Prices

Model 7418 8 channel Smart A/D Qty. 1 $655 Qty. 2-9 $595
Model 7419 16 channel Smart A/D Qty. 1 $825 Qty. 2-9 $750
Model 7409TB Small termination board (2 per 417 required ) Qty. 1 $65 Qty. 2-9 $59
Model 7409TC Large termination board Qty. 1 $105 Qty. 2-9 $95
Model 7409TDIN 7409TC with DIN hardware Qty. 1 $140 Qty. 2-9 $125
Model 7409C 18” interconnect cable Qty. 1 $14 Qty. 2-9 $12
Model 7409C1 1 meter interconnect cable Qty. 1 $28 Qty. 2-9 $25
QuickSense Data Acquisition Software Qty. 1 $195 Qty. 2-9 $195