Choosing a suitable online monitoring pH detector is essential for longer use. High quality PH detection instrument is a highly intelligent online continuous PH monitoring device, consisting of a PH sensor and a secondary PH detection instrument. It can be equipped with three composite or two composite PH electrodes to meet various usage scenarios. Can set isolation transmission 4-20mA output, maximum loop 750 Ω, 0.1% FS, measurement range: PH（0-14 pH）; ORP (-1000-+1000 mV or -2000-+2000 mV), accuracy: ± 0.02 pH; ± 1mV, resolution: 0.01 pH; 1mV, stability: ≤ 0.02 pH/24H; ≤ 3 mV/24H, input impedance: ≥ 1012 Ω, temperature measurement range: -10-130 ℃, accuracy: ± 0.5 ℃ (NTC10K or PT1000), temperature compensation: -10-130 ℃ manual/automatic, RS485 function: compatible with standard MODBUS-RTU communication protocol, power supply: AC220V ± 10%, 50Hz/60Hz (AC110V ± 10%, 50Hz/60Hz), relay alarm: two normally open and normally closed alarm relays AC250V, 3A. The manufacturer supplies industrial online pH detection instruments, PC-3550 PH or ORP detection instrument.