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Gravity: Analog ORP Sensor Meter for Arduino is an Arduino-compatible sensor module for measuring oxidation-reduction potential in aqueous solutions. ORP is used to indicate the relative oxidizing or reducing condition of a liquid, making it useful in water analysis and process monitoring projects.
The system combines an ORP probe with a BNC connector and a signal conditioning board that provides analog signal output for direct connection to compatible Arduino boards. A PH2.0 interface, onboard power LED, and zero calibration button help simplify setup for prototyping and long-term monitoring builds.
It is well suited for water quality testing, aquaculture, marine science, hydroponic gardening, and general chemistry applications where dependable ORP measurement is required.
Use a stable and accurate 5.0V DC supply for best measurement performance. Before testing different solutions, rinse the electrode thoroughly with deionized or pure water.
Do not press the calibration button while the ORP probe is connected to the ORP meter board, as this may damage the probe. The reference documentation also notes that the ORP electrode can generally be used without calibration unless you need to verify performance with a standard solution.
Technical details for the Gravity: Analog ORP Sensor Meter for Arduino.
| Brand | DFRobot |
|---|---|
| Model | SEN0165 |
| Supply Voltage | +5.00V |
| Measuring Range | -2000mV to 2000mV |
| Accuracy | ±10mV (25℃) |
| Response Time | ≤20sec |
| Suitable Temperature | 5-70℃ |
| Module Size | 40mm × 27mm |
| Probe Connection | BNC connector |
| Board Interface | PH2.0 interface (3 foot patch) |
| Output Type | Analog |
To verify and adjust offset, immerse the probe in an ORP standard solution, then read the raw value in the Arduino serial monitor. Update the sample code offset value to match that reading, re-upload the sketch, and then measure your target solution.
For routine use, the electrode may be used directly. Calibration is typically only needed if you want to check electrode quality or confirm measurement accuracy against a standard solution.
Pin configuration for the module interface.
| Pin | Name | Function |
|---|---|---|
| 1 | - | GND |
| 2 | + | 5.0V power input |
| 3 | A | Analog signal output |
Rinse the electrode before and after measurement to maintain accuracy. Long-term use can lead to slower response or reduced sensitivity, so proper cleaning and storage are important for reliable readings over time.
This sensor measures ORP (oxidation-reduction potential) of aqueous solutions and outputs the reading as an analog signal for Arduino. Its measuring range is -2000mV to 2000mV.
Yes. It is designed for Arduino use and provides an analog signal output with a simple 3-pin connection: GND, 5.0V power in, and analog output.
The module is specified for +5.00V power. The reference guide also recommends using a stable and accurate 5.0V DC supply for better measurement accuracy.
The ORP probe uses a BNC connector, and the module also includes a PH2.0 interface. The board size is 40mm × 27mm and includes a power LED and zero calibration button.
According to the reference material, the ORP electrode can be used without calibration in normal cases. If you want to verify or correct readings, you can use an ORP standard solution and adjust the code offset value based on the measured raw reading.
It is suitable for water quality testing, aquaculture, marine science, hydroponic gardening, and general chemistry applications. The specified operating temperature range is 5℃ to 70℃.
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