Salient Features: ① Automatic sensor cleaning allows setting of probe cleaning time and interval. ② One-key restoration (If non-specialized personnel perform incorrect operations, the device can be restored to factory settings via the restore key). ③ Simultaneous display of multiple parameters (temperature and mg/L shown on the same screen). ④ Manual/automatic temperature compensation: Automatically compensates when an external temperature-sensing element is connected; switches to manual mode when disconnected. ⑤ Automatic alarm function: Isolated alarm signal output, freely adjustable upper and lower alarm limits with hysteresis cancellation. ⑥ Startup self-check: Each time the device is powered on, it automatically checks whether all parameters are within the normal range and can self-restore or correct if not. ⑦ Industrial watchdog: Ensures the device does not freeze. Designed with a dedicated watchdog timer in the chip to automatically reset in case of abnormalities. ⑧ Online value correction function. Technical Parameters: 1. Measurement 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. Two isolated signal outputs: 4–20 mA 10. Operating voltage: AC 220 V ±10%, 50/60 Hz 11. Dimensions: 245 × 180 × 124 mm 12. Installation method: Wall-mounted 13. Operating conditions: ① Ambient temperature: -5–55°C ② Relative humidity: ≤90% ③ No strong magnetic interference except the Earth’s magnetic field.