# AGRINOVO-CHL-100: Digital Chlorophyll Sensor

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

## 1. Overview

The AGRINOVO-CHL-100 is a digital chlorophyll sensor for water quality monitoring. It measures chlorophyll concentration and temperature using fluorescence detection, with an integrated self-cleaning brush for low-maintenance operation.

### Key Features

- Chlorophyll: 0 to 500 µg/L
- Temperature: 0 to 100°C
- Accuracy: ±3% FS
- Self-cleaning brush
- RS485 Modbus-RTU
- 32-bit float (IEEE-754)
- Little-endian byte order
- 12-24 VDC power

### Applications

- Algae monitoring
- Water quality assessment
- Aquaculture
- Environmental monitoring

## 2. Specifications

| Parameter | Specification |
|:----------|:--------------|
| **Chlorophyll Range** | 0 to 500 µg/L |
| **Temperature Range** | 0 to 100°C |
| **Accuracy** | ±3% FS |
| **Supply Voltage** | 12-24 VDC |
| **Submersion Depth** | Max 2 meters |
| **Maintenance** | Clean every 4 to 8 weeks |

## 3. Wiring

| Core | Color | Function | Description |
|:-----|:------|:---------|:------------|
| 1 | **Brown** | V+ | Power Supply (12-24V DC) |
| 2 | **Black** | AGND | Power Ground |
| 3 | **Blue** | RS485-A | Data+ |
| 4 | **White** | RS485-B | Data- |

## 4. Communication Settings

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

### Data Format

- **Type**: 32-bit Single Precision Float (IEEE-754)
- **Byte Order**: Little-endian (parse sequence: 4321)

## 5. Register Map

### Measurement Registers (Function 0x03)

| Address (Hex) | Address (Dec) | Description | Range |
|:--------------|:--------------|:------------|:------|
| 0x2600 | 9728 to 9729 | Temperature | 0 to 100°C (float32) |
| 0x2602 | 9730 to 9731 | Chlorophyll | 0 to 500 µg/L (float32) |
| 0x260A | 9738 to 9739 | Signal Value | 0 to 2000 (float32) |

### Configuration Registers

| Address (Hex) | Description | Function | Notes |
|:--------------|:------------|:---------|:------|
| 0x3000 | Slave ID | 0x03/0x10 | Modify address |
| 0x3100 | Manual Brush | 0x10 | Write 0x0000 to trigger |
| 0x3200 | Brush Interval | 0x10 | Default: 60 min (0x3C00) |
| 0x00C8 | Factory Reset | 0x06 | Restore defaults |

## 6. Reading Data

### Read Chlorophyll + Temperature

Read 4 registers from 0x2600:

```
Request:  01 03 26 00 00 04 4F 41
Response: 01 03 08 3F 03 DE 41 71 EB C3 3F B0 DA
```

**Decoding (Little-endian float32):**

| Value | Bytes Received | Reordered | Result |
|:------|:---------------|:----------|:-------|
| Temperature | 3F 03 DE 41 | 41 DE 03 3F | **27.8°C** |
| Chlorophyll | 71 EB C3 3F | 3F C3 EB 71 | **1.53 µg/L** |

## 7. Address Configuration

### Change Address (0x01 → 0x0A)

Write to register 0x3000:

```
01 10 30 00 00 01 02 0A 00 90 F3
```

> **Note:** Communication will be lost until reconnecting with the new address.

### Broadcast Discovery

Use address 255 (0xFF) to discover unknown device address.

## 8. Self-Cleaning Brush

### Trigger Manual Clean

Write 0x0000 to register 0x3100:

```
01 10 31 00 00 01 02 00 00 86 93
```

### Set Cleaning Interval

Write interval (minutes) to register 0x3200. Default: 60 min (0x3C00)

## 9. Installation Notes

**Placement**

- Max depth: 2 meters
- Avoid high-flow areas
- Avoid air bubbles

**Maintenance**

- Clean every 4 to 8 weeks
- Depends on water quality
- Use integrated brush

## Ordering Information

| Part number | Description |
|:------------|:------------|
| AGRINOVO-CHL-100 | Digital Chlorophyll 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.