A family of Sensorex water-quality probes that share one Modbus RTU register map.
Some ratings are not filled in yet. Check the manufacturer’s current datasheet before wiring.
The measured value, temperature, and an alternate reading, depending on the variant:
| Variant | Measures | Also reports |
|---|---|---|
| pH | pH | Temperature (°C), mV |
| Conductivity (CP2) | Conductivity (µS/cm) | Temperature (°C), PPT |
The Sensorex datasheet also defines ORP, dissolved oxygen, free chlorine, and toroidal conductivity variants. See pH and Conductivity.
| pH range | −1.00 to 15.00 pH |
| ORP range | −1,500 to +1,500 mV |
| Conductivity range | 0–10,000 µS/cm |
| Toroidal conductivity range | 0–2,000 mS/cm |
| Free chlorine and chlorine dioxide range | 0–50 ppm |
| Conductivity temperature compensation | 2% per °C by default, adjustable over Modbus |
These ratings are shared by every Smart Sensor with a Modbus RS-485 output.
| Output | Modbus RTU over RS-485 (default); or 4–20 mA loop current over the power pair, selected over Modbus |
| Modbus defaults | Slave ID 240, 19,200 baud, 8 data bits, no parity, 1 stop bit (8N1) |
| Modbus options | Slave ID 1–247; 9,600, 19,200 or 38,400 baud; 8N1, 8E1, 8O1 or 8N2 |
| Data format | 32-bit IEEE 754 floats, high word first; value at registers 3–4, temperature at 5–6, alternate value at 7–8 |
| Supply | 7–40 VDC in Modbus mode |
| Power | Under 90 mW for pH, ORP, dissolved oxygen and free chlorine; under 75 mW for toroidal conductivity; under 50 mW for contacting conductivity |
| Response time | Allow at least 500 ms for the sensor to reply |
| Wetted materials | From datasheet — to be filled in |
Wire colors:
| Wire | Function |
|---|---|
| Red | V+ (7–40 VDC in Modbus mode) |
| Black | V− |
| White | Modbus A |
| Green | Modbus B |
Wetted materials, process connection and pressure and temperature limits differ by variant; take them from that model’s Sensorex instruction sheet.
Sensorex’s Modbus instructions cover calibration; cleaning and storage depend on the variant, so follow that model’s instruction sheet.
Wiring and configuration live with each controller:
Sensorex ships probes at 19,200 baud, 8N1. The InteliHive bus defaults to 9,600 baud, 8E1 (Settings → Modbus). Set the bus and the probes to the same serial settings.