YH-4000A Industrial online Acid / alkali concentration meter YH Series Industrial online Acid / Base Concentration monitoring and control instrument is water quality monitoring control device with a microprocessor. The instrument is widely used in thermal power, chemical, steel pickling and other industries, such as power plants for the regeneration of ion exchange resins, chemicals and other chemical industrial processes, chemistry of aqueous solution of acid or alkali concentration for continuous detection and control. Meter Features ● LCD large-screen LCD intelligent menu operation ● ● Chinese output signal mode optional ● manual, automatic temperature compensation ● two relay control switch ● High limit, low limit, the hysteresis control ● same interface displays the pH value and concentration temperature values ??● password-protected to prevent misuse of the non-staff main technical parameters (1) Measuring range: Concentration: 0 to 10%; Measuring media: HCl, H2SO4, NaOH; temperature: 0 ~ 110.0 ℃; (2) Resolution : Concentration: 0.01%; temperature: 0.1 ℃; (3) the basic error: Concentration: ± 0.25% F · S Temperature: ± 0.3 ℃; (4) Stability: ± 0.25% / 24h; (5) Automatic or manual temperature Compensation range: 0 ~ 110 ℃; (6) isolated current output: 0 ~ 10mA (load resistance <1.5KΩ); 4 ~ 20mA (load resistance <750Ω); (7) to control two relay contacts: 3A 240VAC, 6A 28VDC or 120VAC; (8) the instrument Power supply: 220VAC ± 10%, 50 ± 1Hz, power ≤3W; 24VDC, Power: ≤1W (optional); 12VDC, Power: ≤1W (optional); (9) Instrument Dimensions: 96 × 96 × 130mm; (10) Meter Installation: panel mounting (Panel Mount); installation hole size: 91 × 91mm; (11) Instrument Weight: 0.6kg; (12) Instrument working environment: Temperature: -10 ~ 60 ℃; relative humidity: less than 90%; In addition to the Earth's magnetic field, has no strong magnetic field around it.