# AGRINOVO-O2-100: Digital Soil Oxygen Sensor

Agrinovo technical datasheet, revision 1.2 (October 2026).
PDF version: https://agrinovo.io/datasheets/sensors/AGRINOVO-O2-100_Datasheet.pdf

## 1. Overview

The AGRINOVO-O2-100 is a digital oxygen sensor for monitoring oxygen concentration in the soil root zone and growing environment. An electrochemical sensing cell with built-in temperature compensation measures oxygen as a volume percentage (%VOL) and reports it over an RS485 Modbus-RTU interface.

### Key Features

- Oxygen range: 0-25 %VOL
- Resolution: 0.1 %VOL
- Accuracy: ±2% FS (at 25°C)
- Electrochemical sensing cell
- Built-in temperature compensation
- Response time under 15 seconds
- RS485 Modbus-RTU output
- Low power: ≤15 mA average

### Applications

- Soil root-zone oxygen monitoring
- Soil aeration and drainage assessment
- Greenhouse and substrate growing systems
- Compost and organic matter monitoring

## 2. Specifications

| Parameter | Specification |
|:----------|:--------------|
| **Measured Parameter** | Oxygen concentration |
| **Range** | 0-25 %VOL |
| **Resolution** | 0.1 %VOL |
| **Accuracy** | ±2% FS (at 25°C) |
| **Repeatability** | ≤1% FS |
| **Temperature Drift** | 0.2% FS per °C |
| **Response Time** | Under 15 seconds |
| **Sensing Method** | Electrochemical cell with temperature compensation |

## 3. Electrical Characteristics

| Parameter | Specification |
|:----------|:--------------|
| **Supply Voltage** | 7-24 VDC |
| **Average Current** | ≤15 mA |
| **Operating Temperature** | -20°C to 50°C |
| **Operating Humidity** | 15-80% RH (non-condensing) |
| **Dimensions** | 97 mm length, 30 mm diameter |

**Caution:** Connect the sensor with correct polarity and within the rated supply voltage. Reverse polarity or overvoltage will permanently damage the sensing cell.

## 4. Wiring

| Wire Color | Function | Description |
|:-----------|:---------|:------------|
| **Red** | V+ | Power Supply (7-24V DC) |
| **Black** | GND | Power Ground |
| **Yellow** | RS485-A | Data+ |
| **Green** | RS485-B | Data- |

## 5. Communication Settings

| Parameter | Value |
|:----------|:------|
| **Protocol** | Modbus-RTU |
| **Baud Rate** | 9600 bps |
| **Data Bits** | 8 |
| **Parity** | None |
| **Stop Bits** | 1 |
| **Default Address** | 0x01 |

## 6. Register Map

### Measurement Register (Function 0x03)

| Address | Description | Scaling |
|:--------|:------------|:--------|
| 0x0000 | Oxygen Concentration | Value ÷ 10 = %VOL |

### Address Configuration (Function 0x06)

| Address | Description | Range |
|:--------|:------------|:------|
| 0x0000 | Slave Address | 0x01-0xFE |

The oxygen value is read from register 0x0000 with function 0x03. The slave address is changed by writing the new address to register 0x0000 with function 0x06.

## 7. Reading Data

Read 1 register from 0x0000 (function 0x03):

```
Request:  01 03 00 00 00 01 84 0A
Response: 01 03 02 00 D1 78 18
```

**Decoding:**

| Register | Hex | Decimal | Scaling | Result |
|:---------|:----|:--------|:--------|:-------|
| 0x0000 Oxygen | 0x00D1 | 209 | ÷ 10 | **20.9 %VOL** |

## 8. Address Configuration

### Change Address (0x01 to 0x02)

Write the new address to register 0x0000 with function 0x06:

```
Request:  01 06 00 00 00 02 08 0B
```

Power cycle the sensor after changing the address.

### Broadcast Discovery

Use address 0xFE with only one device connected to query an unknown address.

## 9. Installation Notes

**Placement**

- Install the probe in the active root zone at the depth of interest
- Ensure firm soil contact around the sensing end
- Keep the sensing membrane clear of standing water
- Install at multiple depths to build an oxygen profile

**Environment & Maintenance**

- Operating range: -20°C to 50°C
- Avoid condensation and water saturation at the membrane
- Keep the sensing cell free of sticky particles and debris
- Do not open the housing or touch the membrane

## Ordering Information

| Part number | Description |
|:------------|:------------|
| AGRINOVO-O2-100 | Digital Soil Oxygen Sensor |

## Revision History

| Rev | Date | Changes |
|:----|:-----|:--------|
| 1.0 | June 2026 | Initial release |
| 1.1 | August 2026 | Layout revision |
| 1.2 | October 2026 | New layout |

## Contact

Agrinovo, https://agrinovo.io/products, contact@agrinovo.io, +972 54 688 8148 (direct / WhatsApp).
Specifications subject to change without notice.