APD 4058 - Strain Gauge Bridge/Load Cell to DC Transmitter - Field Configurable

The APD 4058 Strain Gauge Bridge to DC Transmitter is a versatile, field-configurable signal conditioning module designed to convert low-level millivolt signals from load cells, strain gauges, bridge sensors, and pressure transducers into stable, linear DC voltage or current outputs. Engineered for industrial automation, weighing systems, and process control applications, the APD 4058 provides precise signal amplification, filtering, and scaling in a compact DIN rail mount package.

With flexible input/output configuration, an adjustable excitation supply, and advanced diagnostic features, the APD 4058 delivers reliable performance in demanding industrial environments.

Convert Low-Level Millivolt Signals into Usable Analog Outputs

Strain gauge and load cell sensors typically produce very small millivolt signals that must be amplified and conditioned before they can be used by control systems. The APD 4058 is specifically designed to perform this function:

• Accepts millivolt signals from bridge-based sensors

• Amplifies and filters the input signal

• Outputs a proportional DC voltage or current signal

This allows seamless integration with:

• PLCs and automation systems

• Data acquisition systems

• Process controllers and indicators

Wide Input Compatibility for Bridge-Based Sensors

The APD 4058 supports a broad range of input types:

• Bridge resistance: 100 Ω to 10,000 Ω

• Sensitivity: 0.5 mV/V to 120 mV/V

• Millivolt input range: 0 to 5 mV up to 0 to 1200 mV

This flexibility makes the module compatible with:

• Load cells

• Strain gauge pressure sensors

• Bridge-based force and torque sensors

• Industrial weighing systems

Adjustable Excitation Power Supply

A key feature of the APD 4058 is its built-in excitation power supply:

• Output: 0 to 10 VDC (adjustable in 1 V increments)

• Fine adjustment: ±2.5% via potentiometer

• Drive capability: One 100 Ω to 10,000 Ω bridge

The excitation supply provides a stable voltage source to power your sensor, ensuring consistent and accurate measurement results.

Field Configurable for Maximum Flexibility

The APD 4058 is designed for quick and easy configuration in the field:

• Rotary and slide switches for input, output, and excitation setup

• Hundreds of selectable I/O range combinations

• “One-minute setup” capability

Users can configure:

• Input range (mV or mV/V)

• Output range (voltage or current)

• Excitation voltage

• Output type (V or mA)

This flexibility eliminates the need for factory customization and simplifies installation.

Flexible Output Options

The APD 4058 provides a wide range of output signals:

Voltage Outputs:

• 0–1 VDC to 0–10 VDC

• Bipolar ±1 VDC to ±10 VDC

Current Outputs:

• 0–2 mA to 0–20 mA

• 4–20 mA (industry standard)

The module supports both current sinking and sourcing, allowing compatibility with virtually any receiving device.

High Accuracy and Stability

The APD 4058 delivers precise and reliable signal conditioning:

• Linearity: Better than ±0.1% of span

• Temperature stability: ±0.02% per °C

• Common mode rejection: 100 dB minimum

These specifications ensure consistent performance in critical measurement applications.

Offset Adjustment and Tare Capability

The APD 4058 includes advanced offset adjustment features:

• Zero offset adjustment: Up to ±100% of span

• Compensates for sensor offsets or deadweight (tare)

• Allows accurate zeroing even with preloaded systems

This is especially useful in weighing and force measurement applications where initial load conditions must be accounted for.

LoopTracker® LEDs for Real-Time Diagnostics

The APD 4058 features API’s exclusive LoopTracker® diagnostic LEDs:

• Green LED: Indicates input signal level

• Red LED: Indicates output signal level

LED brightness changes with signal intensity, providing a quick visual indication of system operation and simplifying troubleshooting.

Output Test Function for Easy Commissioning

The built-in output test function allows users to simulate an output signal:

• Adjustable from 0% to 100% of output span

• Independent of input signal

• Activated via front-panel test button

This feature simplifies:

• System startup

• Calibration verification

• Troubleshooting

Fast Response Time for Dynamic Applications

The APD 4058 offers responsive signal conversion:

• Standard response time: ~70 milliseconds

• Optional fast response (DF option): ~10 milliseconds

This allows the module to track rapidly changing signals in dynamic applications.

Rugged Industrial Design

The APD 4058 is built for reliable operation in industrial environments:

• DIN rail mountable (35 mm rail)

• Compact housing (0.89" W x 4.62" H x 4.81" D)

• Removable terminal blocks for easy wiring

The module is designed for installation in a protective enclosure and provides long-term durability in industrial settings.

Flexible Power Options

The APD 4058 supports multiple power configurations:

• Standard: 85–265 VAC or 60–300 VDC

• Optional: 9–30 VDC or 10–32 VAC

This flexibility allows integration into a wide range of systems.

Typical Applications

The APD 4058 is ideal for:

• Load cell weighing systems and scales

• Tank weighing and level measurement

• Crane load monitoring

• Extruder melt pressure measurement

• Strain gauge pressure transducers

• Force and torque measurement systems

Its ability to convert low-level signals into standard analog outputs makes it essential for many industrial applications.

Why Use a Strain Gauge Signal Conditioner?

Strain gauge and load cell sensors produce very low-level signals that are susceptible to noise and interference. A signal conditioner like the APD 4058 provides:

• Accurate amplification of millivolt signals

• Stable excitation voltage

• Noise filtering and signal conditioning

• Compatibility with standard analog systems

This ensures reliable and accurate measurement in critical applications.

Key Features at a Glance

• Accepts 100 Ω to 10,000 Ω bridge sensors

• Input range: 0–5 mV to 0–1200 mV

• Adjustable excitation: 0–10 VDC

• Voltage and current output options

• Sink/source current output capability

• Field configurable with rotary switches

• Offset adjustment up to ±100% of span

• LoopTracker® input/output LEDs

• Output test function

• Fast response time options

• DIN rail mountable design

A Versatile Solution for Load Cell and Bridge Signal Conversion

The APD 4058 provides a flexible, accurate, and easy-to-configure solution for converting strain gauge and load cell signals into usable analog outputs. Its combination of performance, configurability, and diagnostic features makes it a valuable component in industrial automation and measurement systems.

Optimize Your Measurement System

Whether you are working with load cells, pressure transducers, or other bridge-based sensors, the APD 4058 delivers the precision and reliability needed for accurate signal conversion and system integration.

Contact us today to learn more or configure the right signal conditioning solution for your application.