Model 7429 | Low Power Analog to Digital
Features
  • Supports thermocouples, thermistors, RTD's, strain and pressure gauges
  • 650 mW operating, 85 mW standby
  • -40C to 85C operating temperature
  • Auto-calibration eliminates trimpots
  • Conditions and linearizes sensor signals
  • Software programmable for sensor type, gain, low-pass filtering, scan rate

The 7429 is a Legacy product and is not recommended for new designs. The lead time for the 7429 may be as long as 12 weeks and may require a minimum quantity order. Please call for availability.

Description
The Sensoray Model 7429 Smart A/D offers a cost-effective way to acquire sensor data for any STD 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.

The 7429 board plugs directly into any STD bus slot. 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 7409DIN with Din rail mounting hardware.

Calibration
The 7429 automatically self-calibrates by measuring internal references. Reference data is stored in an EEPROM so that boards may be easily interchanged. Signal conditioning is provided for thermistors, RTD's, thermocouples, strain and pressure, resistance and voltage inputs. Standard correction for non-linear 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 four-wire circuits. 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 independent of host CPU activity.

Low Power mode
In the "awake" mode, power dissipation is just 650 mW. Sending a powerdown command puts the board in a low power standby state. The board is awakened by a software command.

Extended temperature
The use of integrated circuits rated at -40C to 85C, or better, allows the 7429 to operate down to -40C.

Software and Manuals

Model 7429 Instruction Manual Released 2/1/99
Model 7429 Software Instruction Manual Released 2/1/99

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 -40°C to 85 °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 7429 Analog & Digital Interface Please call for availability
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 $19 Qty. 2-9 $18
Model 7409C1 1 meter interconnect cable Qty. 1 $28 Qty. 2-9 $25