APD 4059 - Strain Gauge Bridge/Load Cell to DC Transmitter - Field Configurable - Isolated

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API Module Power Options


• DC Voltage Input: 0-5 mV to 0-1200 mV
• DC Output: 0-1 V, 0-5 V, 0-10 V, +/- 5 V, +/- 10 V, 4-20 mA, etc.
• Strain Gauge Bridge Excitation: 1 to 10 VDC
• Field-Configurable by User

The APD 4059 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 dead weights (taring). Non-interactive zero and span simplifies calibration.


Strain Gauge Input Ranges
Minimum range: 0 to 5 mV
Maximum range: 0 to 400 mV
Minimum sensitivity: 0.5 mV/V
Maximum sensitivity: 40 mV/V
Millivolt output range is determined by the sensitivity of the sensor (mV/V) and the excitation voltage applied.
mV/V sensitivity X excitation voltage = total mV range

Input Impedance
200 kΩ typical

Common Mode Rejection
100 dB minimum

Calibration Resistor Options
M01 option: Switch with calibration resistor inside module. Specify resistor value.
M02 option: Switch for external (load cell) calibration resistor.

Excitation Voltage
Maximum output: 10 VDC maximum at 120 mA
Drive capability: Up to four 350 Ω bridges at 10 VDC
Fine adjustment: ±5% via multiturn potentiometer
Stability: ±0.01% per °C

DC Output Ranges
                          Minimum       Maximum
Voltage:             0-1 VDC        0-10 VDC (10 mA max)
Bipolar Voltage: ±5 VDC        ±10 VDC (±10 mA max)
Current:             0-2 mADC    0-20 mADC
                          20 V compliance, 1000 Ω at 20 mA

Output Ripple and Noise
Less than 10 mVRMS ripple and noise

Better than ±0.1% of span

Ambient Temperature Range and Stability
–10°C to +60°C operating ambient
Better than ±0.02% of span per °C stability

Response Time
70 milliseconds typical (14.3 Hz)
DF option: 10 millisecond response time typical (100 Hz)
Contact factory for custom response times


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