Features:

• Drive up to Four 350 Ω Bridges
• Adjustable Excitation Power Supply
• Sense Lead Compensation
• Easy to Cancel or Tare Out Deadweights
• One Minute Setup for Hundreds of I/O Ranges
• Full 3-Way Input/Output/Power Isolation
• Hot-Swappable Plug-In Design
• Non-Interactive Zero and Span
• Full 3-Way Input/Output/Power Isolation
• Input and Output LoopTracker® LEDs
• Output Test or Calibration Resistor Options

Applications:

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

The API 4059 G accepts a strain gauge, bridge, load cell, or a summed input from up to four sensors, and provides a proportional, isolated DC voltage or current output. It includes filtering and processing to allow effective use of low-level transducers in the noisy environments found in industrial applications. 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 120 mA adjustable bridge excitation power supply generates a stable source of excitation voltage to drive from one to four 350 W (or greater) bridge type sensors such as load cells, pressure transducers and strain gauges and amplifies and converts the resulting millivolt signal into the selected output. 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. Common ranges are on the module label. Offsets up to ±100% of span can be used to cancel sensor offsets or non-zero deadweights (taring). Noninteractive zero and span simplifies calibration.

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.

Output Test

An API exclusive feature includes the test button to provide a fixed output (independent of the input) when held depressed. The output test button greatly aids in saving time during initial startup and/or troubleshooting. The test output level is potentiometer adjustable from 0 to 100% of output span. A calibration resistor switch replaces the test button.

Mounting

The API 4059 G plugs into an industry standard 11-Pin octal socket sold separately. Sockets API 011 and finger-safe API 011 FS allow either DIN rail or panel mounting.