Salient Features: ① Automatic sensor cleaning function allows setting of probe cleaning time and intervals. ② One-key restoration (If non-specialized personnel perform incorrect operations, the device can be restored to factory settings via the restoration key). ③ Simultaneous display of multiple parameters (temperature and mg/L values shown on the same screen). ④ Manual/automatic temperature compensation: Automatically compensates when external temperature-sensing elements are connected; switches to manual mode when disconnected. ⑤ Automatic alarm function: Isolated alarm signal output, customizable upper and lower alarm limits with hysteresis cancellation. ⑥ Startup self-check: The device automatically checks all parameters upon startup. If any parameter is abnormal, it self-corrects or restores. ⑦ Industrial watchdog: Ensures the device does not freeze. The built-in watchdog timer automatically resets the device upon detection of abnormalities. ⑧ Online value calibration function. Technical Parameters: 1. Measuring range: 0.00–19.99 mg/L 2. Resolution: 0.01 mg/L 3. Zero calibration range: 500 μg/L 4. Slope calibration range: 20%–180% 5. Temperature compensation: 0–45°C (automatic or manual) 6. Relay control range: 0.00–19.99 mg/L 7. Automatic cleaning time: 1 s–99 m 59 s 8. Cleaning interval: 1–720 min 9. Dual signal output: Isolated 4–20 mA 10. Communication interface: RS232 or RS485 (optional) 11. Operating voltage: AC 220 V ±10%, 50/60 Hz 12. Dimensions: 144 × 144 × 210 mm 13. Panel cutout dimensions: 138 × 138 mm 14. Installation method: Embedded mounting 15. Operating conditions: ① Ambient temperature: –5–55°C ② Relative humidity: ≤90% ③ No strong magnetic interference except Earth’s natural magnetic field.