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

The API 4058G Strain Gauge Bridge / Load Cell to DC Transmitter is a versatile, field-configurable signal conditioning module designed to convert low-level millivolt signals from strain gauges, load cells, and bridge-type sensors into stable DC voltage or current outputs. Engineered for industrial environments, the 4058G provides accurate amplification, filtering, and scaling of sensor signals, enabling seamless integration with PLCs, data acquisition systems, and process control equipment.

With built-in excitation power, flexible configuration options, and rugged industrial construction, the API 4058G is an ideal solution for applications requiring reliable measurement of force, weight, pressure, or strain.

Convert Low-Level Bridge Signals into Usable Outputs

Strain gauges, load cells, and pressure transducers typically produce very small millivolt signals that must be amplified and conditioned before they can be used by control systems. The API 4058G performs this critical function by converting these low-level inputs into proportional DC voltage or current outputs.

The module accepts inputs from:

• Strain gauges

• Load cells

• Bridge sensors

• Pressure transducers

It then provides a linearly related DC output signal that can be easily interpreted by downstream systems.

Supports Multiple Sensors and Bridge Configurations

The API 4058G is capable of driving and summing signals from multiple sensors, making it highly adaptable for complex measurement systems.

• Supports one to four 350 Ω bridge sensors

• Compatible with higher resistance bridges

• Ideal for multi-sensor averaging or summation

This capability is particularly useful in applications such as weighing systems and distributed load measurement.

Built-In Adjustable Excitation Power Supply

A key feature of the API 4058G is its integrated excitation power supply, which provides a stable voltage to power connected sensors.

• Adjustable excitation: 0 to 10 VDC in 1 V increments

• Maximum output: 10 VDC at 115 mA

• Stability: ±0.01% per °C

This eliminates the need for external excitation sources and ensures consistent sensor performance.

Wide Input Range for Flexible Sensor Compatibility

The API 4058G supports a wide range of millivolt inputs, making it compatible with a variety of sensor sensitivities.

• Input range: 0 to 5 mV up to 0 to 1200 mV

• Sensitivity range: 0.5 mV/V to 120 mV/V

The total input signal is determined by the sensor’s mV/V rating and the applied excitation voltage, allowing for precise configuration based on application requirements.

Flexible DC Output Options

The module provides multiple output configurations to match the needs of different systems:

• Voltage outputs: 0–1 V to 0–10 VDC

• Bipolar voltage outputs: ±1 V to ±10 VDC

• Current outputs: 0–2 mA to 4–20 mA

This flexibility allows the 4058G to interface with:

• PLCs and DCS systems

• Data acquisition systems

• Panel meters and recorders

• SCADA systems

Field Configurable for Fast Setup

The API 4058G is designed for easy field configuration using external switches and adjustments.

Key configuration features include:

• Rotary switches for input, output, and excitation selection

• Slide switch for voltage or current output selection

• Zero and span potentiometers for calibration

• Offset adjustment for tare or sensor offset compensation

This “one-minute setup” approach allows users to quickly configure the module without specialized tools.

Offset and Tare Adjustment Capability

The module includes an offset adjustment feature, allowing users to compensate for sensor offsets or tare weights.

• Zero offset adjustment: ±100% of span in increments

This is particularly valuable in weighing applications where the system must account for container weight or baseline conditions.

High Accuracy and Signal Quality

The API 4058G delivers precise and stable signal conditioning performance:

• Linearity: ±0.1% of span

• Noise and ripple: <10 mVRMS

• Common mode rejection: 100 dB minimum

These specifications ensure accurate measurement and reliable operation even in electrically noisy environments.

LoopTracker® LEDs for Real-Time Monitoring

The API 4058G features built-in LoopTracker LEDs that provide visual feedback of system performance:

• Green LED indicates input signal activity

• Red LED indicates output signal activity

• LED brightness varies with signal level

These indicators allow operators to quickly assess system status and identify potential issues during operation.

Output Test Function for Diagnostics

The module includes a functional test button that allows users to simulate an output signal for system verification.

• Adjustable from 0 to 100% of output span

• Independent of input signal

• Useful for startup and troubleshooting

This feature helps reduce commissioning time and simplifies diagnostics.

Optional Internal Calibration Resistor

For applications requiring precise calibration, the API 4058G offers an optional internal shunt calibration resistor (M01 option).

• Simulates known sensor output

• Enables quick calibration without external equipment

• Ideal for load cell and bridge calibration

Rugged Industrial Design

The API 4058G is built for reliable operation in demanding environments:

• Operating temperature: –10°C to +60°C

• Compact plug-in design

• DIN rail or panel mounting with 11-pin socket

• Hot-swappable module for easy maintenance

Its durable construction ensures long-term performance in industrial applications.

Typical Applications

The API 4058G is widely used in applications involving force, weight, and pressure measurement:

• Load cell weighing systems and scales

• Tank level measurement systems

• Extruder melt pressure monitoring

• Crane load monitoring

• Industrial pressure transducers

Its ability to accurately condition low-level signals makes it a critical component in measurement systems.

Why Use a Load Cell Signal Conditioner?

Load cells and strain gauges produce very small signals that are susceptible to noise and interference. A signal conditioner like the API 4058G provides:

• Amplification of low-level signals

• Filtering to reduce noise

• Scaling for system compatibility

• Stable excitation voltage for sensors

Why Choose the API 4058G?

The API 4058G stands out as a flexible and reliable signal conditioning solution due to its:

• Support for multiple bridge sensors

• Built-in adjustable excitation supply

• Wide input and output range flexibility

• Field-configurable setup

• Offset and tare adjustment capability

• High accuracy and noise rejection

• Built-in diagnostics and test functionality

• Rugged industrial design

A Complete Solution for Bridge and Load Cell Signal Conditioning

The API 4058G provides everything needed to convert and condition strain gauge and load cell signals for industrial use. Its combination of flexibility, accuracy, and ease of use makes it an essential tool for engineers working with force, weight, and pressure measurement systems.

Optimize Your Measurement System

Whether you are designing a weighing system, monitoring process pressure, or integrating sensors into a control system, the API 4058G delivers the performance and reliability needed to ensure accurate and consistent results.

Contact us today to learn more or configure a solution tailored to your application.