User manual for the PR-300B-CL N01-20 industrial chlorine residual controller with RS485 communication.
This manual introduces the PR-300B-CL N01-20 chlorine residual controller, describing its features, technical parameters, and installation options. It covers hardware dimensions, electrode installation, wiring, and display operation.
The guide also details menu navigation, alarm settings, analog output configuration, calibration procedures, Modbus communication settings, and maintenance recommendations. Users can find step‑by‑step instructions for parameter configuration and troubleshooting. This manual is written in Chinese.
| Chlorine measurement range | 0–20.00 mg/L |
|---|---|
| Measurement accuracy | 3 % or 0.3 mg/L (whichever is larger) |
| Reproducibility error | ±0.03 mg/L |
| Input impedance | ≥10¹² Ω |
| Analog output current range | 4–20 mA |
| Power consumption | DC 24 V ≤1.6 W; AC 220 V ≤15 W |
| Protection rating | IP54 |
| Dimensions (L×W×H) | 96 mm × 96 mm × 110 mm |
| Weight | ≤0.6 kg |
| Operating temperature | -20 °C to 60 °C |
| Relative humidity | <85 % |
Enter menu item 7 (通信设置) and set the Modbus address to any value between 0 and 254; the default address is 0x01.
The controller ships with a default baud rate of 4800 bit/s, which can be changed to 2400, 4800, or 9600 bit/s.
The device stores up to 72 data points, recording one point per hour for three consecutive days.