1. Measurement Range: Hypochlorous acid (HOCL): 0-10.00 mg/L, Residual chlorine: 0-20.00 mg/L, pH value: 0-14 pH, Temperature: 0~60℃ 2. Resolution: 0.01 mg/L, 0.01 mg/L, 0.01 pH, 0.1℃ 3. Accuracy: Better than ±1% or ±0.01 mg/L, ±1% or ±0.01 mg/L, ±0.02 pH, ±0.5℃ 4. Manual/Automatic pH compensation function (0-14) and temperature compensation function (0~60℃). 5. Control Interface: Two sets of ON/OFF relay contacts, divided into high and low alarm signal photoelectric isolation output. 6. Signal Isolation Output: Optocoupler isolated protection 4～20mA signal output 7. Relay: Relay hysteresis can be set arbitrarily, relay load 10A 220VAC 8. Operating Conditions: Ambient temperature 0~60℃, relative humidity ≤90% 9. Output Load: Load <500Ω (0-10mA), Load <750Ω (4-20mA) 10. Input Impedance: ≥1×10^12Ω 11. Operating Voltage: 220VAC±10%, 50/60Hz 12. Dimensions: 96×96×115 mm 13. Panel Cut-out Dimensions: 91×91mm 14. Weight: 0.9Kg