Main Menu
  • หน้าแรก>>Products>>Control System>>Control System (Wall Mounted Process Control)>>อุปกรณ์วัด Control System (Industrial Grade pH Digital Controllers Wall Mounted with Matching Pin)
  • header_20130410103601.jpg

    อุปกรณ์วัด Control System (Industrial Grade pH Digital Controllers Wall Mounted with Matching Pin)

    HI 21

    Industrial Grade pH Digital Controllers Wall Mounted with Matching Pin

    The HI 21 controllers are simple to operate, microprocessor-based pH process controllers packed with features. With HI 21 quick one, two or three point calibration at pH 4.01, 7.01 and 10.01 comes standard and you can choose from ON/OFF, proportional and PID control to save on chemicals. These instruments have a differential input, extending electrode life by eliminating ground loop current through the reference.

    Password protection prevents unauthorized modifications in settings or calibration. The Fail Safe Alarm System protects the HI 21 against the pitfalls of process control, like power interruption or line failure.
    Wiring the controllers is simple with extractable terminal modules. A host of self-testing features and user-friendly functions make HI 21 a great value.

    For more flexibility and better resolution for chart recorders, any two points between 0 and 14 pH can be chosen to correspond to the analog output spans. Some HI 21 models are equipped with a bi-directional RS485 port, which allows remote control of the instrument from a PC.


    Range pH 0.00 to 14.00 pH
    Temperature -9.9 to 120°C
    Resolution pH 0.01 pH
    Temperature 0.1°C
    Accuracy @ 20°C pH ±0.02 pH
    Temperature ±0.5°C
    Input Impedance  1012 Ohm
    pH Calibration  automatic, one, two or three point, at pH 4.01, 7.01, 10.01
    Compensation  automatic (with Pt100 probe) or manual from -9.9 to 120°C
    Analog Output  0 to 1 mA, 0 to 20 mA, 4 to 20 mA; 0 to 5 VDC, 1 to 5 VDC, 0 to 10 VDC
    Digital Output  RS485
    Relays 1 and 2  electromechanical relay SPDT contact outputs, 5A-250 VAC, 5A – 30 VDC (resistive load) (HI 211YZ and HI 212YZ), fuse protected: 5A, 250V fast fuse
    Alarm Relay  electromechanical relay SPDT contact output, 5A – 250 VAC, 5A – 30 VDC (resistive load) fuse protected: 5A, 250V, 250V fast fuse
    Power Supply Input  ±5V (for amplified electrodes)
    Power Supply  115 VAC ±10% or 230 VAC ±10%; 50/60 Hz
    Power Consumption  15 VA
    Over Current Protection  400 mA, 250V, fast fuse
    Environment  0 to 50°C (32 to 122°F); RH max. 85% non-condensing
    Protection  IP 54
    Dimensions  221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
    Weight  1.4 kg (3.1 lb.)


    HI 7004L
    4.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7007L
    7.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7010L
    10.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 8427
    pH and mV Precision Simulator
    HI 931001
    pH and mV Precision Simulator

  • Requesting a Quotation and Ordering Products

    131 Thailand Science Park. Innovation Cluster 1 Building,

    Klong 1, Klong Luang, Pathumthani 12120 Thailand. 

    Tel.  02-191-3928 Fax 02-191-3929

    For more information please contact 081-847-6768 (Ms. Nareerat) IDLine: @alltestkit

    E-mail :


    >>Online Quotation Click here<<