Cecomp Electronics, APD 4059 CR, Isolated DC Amplifier for 1 to 4 Sensors with Calibration Resistor Option, 85-265 VAC, 60-300 VDC Power

Features:

• Use Internal or External Calibration Resistor
• Sense Lead Compensation
• Easy to Cancel or Tare Out Deadweights
• Drive up to Four 350 Ω Bridges
• Zero and Span Output Calibration Potentiometers
• One Minute Setup for Hundreds of I/O Ranges
• Removable Plugs for Faster Installation
• Full 3-Way Input/Output/Power Isolation
• Input and Output LoopTracker® LEDs
• Adjustable Excitation Power Supply

Applications:

• Load Cell Weighing Systems and Scales
• Strain Gauge Pressure Sensors and Transducers
• Tanks, Scales, Extruder Melt Pressure, Crane Loads

The APD 4059 CR accepts an input from one to four strain gauges, bridge type sensors, load cells, or pressure transducers. It filters, amplifies, and converts the resulting millivolt signal into the selected DC voltage or current output that is linearly related to the input.

The full 3 way (input, output, power) isolation makes this module useful for ground loop elimination, common mode signal rejection or 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 leadwire 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 deadweights (taring). Non-interactive zero and span simplifies calibration.

The APD 4059 CR can be specified with varying degrees of filtering to tailor the response time to the application. Consult factory for assistance.

Sink/Source Versatility

For maximum versatility the APD 4059 CR milliamp output can be selectively wired for sinking or sourcing. This allows connection to any type of mA input receiving device.

LoopTracker

API exclusive features include two LoopTracker LEDs (green for input, red for output) that 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.

Calibration Resistor

The APD 4059 CR has provisions for an internal or 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.