Technical parameters:

Range of measurement: -4.00~18.00pH or -1999~+1999mV Resolution ratio: 0.01 pH; 1mV Grade    0.05 level Stability:  ≤0.02pH/24h; ≤1mV/24h pH correction range    zero : ±1.50pH slope : ±30% pH standard liquid    6.86/4.00/9.18 or 7.00/4.01/10.00 (instrument automatic identification) ORP standard liquid    all standard liquids Control range 0~14.00pH; -1999~+1999mV Control output mode    ON/OFF relay output connection (foru groups) Working voltage    220VAC±10%, 50/60Hz Size 96×96×125 mm Relay load    maximum AC 220V 5A Current output load    0~500W Signal input impedance    ≥1×1012W Installation    indoor embedded installation Elctrode installation    immersion type, pipeline type, suspension type Output signal    output range is adjustable, reversible, photocoupling isolated two groups 4~20mA 0.00~14.00pH corresponding output 4~20mA (factory setting)-1000~+1000mV corresponding output 4~20mA (factory setting)0.0 ~ 100.0℃ corresponding output 4~20mA (factory setting)Working condition Environment temperature : -5 ~ 55℃, no direct sunlight; relative air humidity: ≤90%; Without strong magnetic-field interference except earth magnetic field; without harmonic interference.