Series APD4059 For Load Cells/Pressure Transducers Transmitters. Field Rangeable, with Calibration Resistor

The Series APD4059 filters, amplifies, and converts the resulting milli-volt signal into the selected DC voltage or current output that is linearly related to the input, and is field rangeable with a calibration resistor.

The Series APD4059 accepts an input from:

• 1-4 strain gauges
• Bridge type sensors
• Load cells
• Pressure transducers

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Series APD4059 Product Information

Within the APD4059, the full three-way (input, output, power) isolation makes this module useful for:

  • Ground loop elimination
  • Common mode signal rejection
  • Noise pickup reduction

The adjustable excitation power supply generates a stable source of voltage to drive from one to four 350 Ω (or greater) devices.

Sense lead circuitry is included to cancel the effects of lead wire resistance, if required. Input, output, excitation and zero offset are field configurable, via external rotary and slide switches. Offsets up to ±100% of span can be used to cancel sensor offsets or non-zero dead weights (taring). Non-interactive zero and span simplifies calibration.

The APD4059 can be specified with varying degrees of filtering to tailor the response time to the application. For maximum versatility the APD4059STRD milliamp output can be selectively wired for sinking or sourcing. This allows connection to any type of mA input receiving device. Consult factory for assistance.

The APD4059 Status LED

Two LEDs (green for input, red for output) vary in intensity with changes in the process input and output signals.

These provide a quick visual picture of your process loop at all times and can greatly aid in saving time during initial startup and/or troubleshooting.

The APD4059 Calibration Resistor

The Series APD4059 has provisions for an internal and external calibration resistor. The internal calibration resistor value can be specified at time of order, or the resistor can be customer installed or changed.

For load cells with their own internal calibration resistor, terminals are provided for wiring connections. The test switch is used to shunt the calibration resistor across one arm of bridge to simulate strain.