AC Voltage Sensor Module ZMPT101B (Single Phase)

Product Description The ZMPT101B AC Voltage Sensor Module is a high-precision, single-phase voltage transformer designed for monitoring and measuring AC mains voltage. Unlike resistive dividers, this module uses a galvanic isolation transformer, providing a safety barrier of up to 4000V between the high-voltage AC line and your low-voltage microcontroller. It features an on-board multi-turn potentiometer to calibrate the output signal amplitude, converting a 250V AC input into a safe, low-voltage analog sine wave that can be sampled by an Arduino, ESP32, or Raspberry Pi. This makes it an essential component for DIY smart energy meters, voltage stabilizers, and power quality monitoring systems.

Key Features

• Galvanic Isolation: High-quality ZMPT101B transformer provides physical isolation, protecting microcontrollers from high-voltage AC surges.

• On-board Precision OP-AMP: Includes a signal conditioning circuit to amplify and offset the sine wave for accurate ADC sampling.

• Wide Measuring Range: Capable of detecting AC voltages from 0V up to 250V, covering standard 110V and 230V mains.

• Adjustable Gain: Features a multi-turn trimmer potentiometer to fine-tune the output voltage range to match your ADC’s resolution.

• Analog Sine Wave Output: Provides a real-time wave image, allowing for the calculation of RMS voltage, peak-to-peak voltage, and power factor.

Technical Details

• Transformer Ratio: Uses a 2mA/2mA current-type voltage transformer for superior linearity and phase consistency.

• Signal Offset: The output is typically biased to VCC/2, allowing the ADC to read both the positive and negative cycles of the AC wave.

• Operating Current: Low power consumption, requiring less than 10mA to power the on-board Op-Amp circuit.

• Phase Compensation: Minimal phase shift design ensures the output wave is synchronized with the input for power factor calculations.

• Dielectric Strength: Tested to withstand up to 4kV, ensuring industrial-grade safety for consumer electronics.

• Sampling Frequency: Optimized for 50Hz/60Hz grid frequencies with excellent harmonic response.

• Potentiometer Function: Clockwise rotation increases the output signal amplitude; counter-clockwise decreases it.

• PCB Construction: Dual-layer FR-4 PCB with high-clearance traces for high-voltage safety and isolation.

• Pin Configuration: VCC, GND, and OUT for the low-voltage side; 2-pin screw terminal for the AC input side.

• Output Linearity: Maintains 0.1% linearity across the full measuring range, critical for revenue-grade metering prototypes.

• Logic Compatibility: Works with 5V systems (Arduino) and 3.3V systems (ESP32/STM32) by adjusting the gain and VCC.

• Mounting: Compact vertical transformer mounting saves space on control panels or inside junction boxes.

• Environmental Stability: Epoxy-potted transformer ensures moisture resistance and mechanical durability.

• Response Time: Near-instantaneous analog tracking of the input voltage waveform.

• Standard Interface: 2.54mm pitch headers for easy breadboard or jumper wire connectivity.