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    อุปกรณ์วัด Control System (Industrial Grade pH & Conductivity Controller with Proportional Control of Fertilization)

    HI 9913

    Industrial Grade pH & Conductivity Controller with Proportional Control of Fertilization

    HI 9913 is a 2-in-1 pH and conductivity controller engineered for dosage of fertilizer solutions in hydroponics and agriculture.

    HI 9913 measures pH from 0 to 14 and EC from 0 to 10 mS/cm. Two separate set points can be user adjusted from 4 to 7 pH and 0 to 6 mS/cm. The relays are activated when pH exceeds the set point or conductivity falls below the desired value. Two pumps or electrovalves can be wired directly to the controller and be powered through the terminal. The operator can adjust two independent proportional settings for pH and conductivity. The time cycle is adjustable from 0 to 90 seconds, while the proportional band is 0 to 2 for both pH and EC. A matching pin/ground probe can be connected to the appropriate terminals to eliminate interference and prolong the pH electrode’s life.

    HI 9913 provides for an alarm relay which is activated in several circumstances. These include when the pH is below the set point by the operator-adjustable threshold of 0.5 to 2.5 pH, or EC exceeds the set point by a value in the 0.5 to 2.5 mS/cm range. The alarm goes off if the pH and/or conductivity are not corrected within the operator-determined time frame of 1 to 10 minutes. The alarm can be turned off during maintenance.

    Fertilization status can be ascertained from a distance through dosage and alarm LED’s.

    HI 9913 accepts pH electrodes with BNC and conductivity probes with DIN connectors.


    Range pH 0.00 to 14.00 pH
    EC 0.00 to 10.00 mS/cm
    Resolution pH 0.01 pH
    EC 0.01 mS/cm
    Accuracy @ 20°C pH ±0.02 pH
    EC ±2% f.s. EC
    Input Impedance  1012 Ohm
    Calibration  through “OFFSET” and “SLOPE” trimmers for pH, and “ZERO CAL” and “SLOPE CAL” for Conductivity (EC)
    Setpoint  from 4.0 to 7.0 pH and 1.0 to 4.0 mS/cm (EC)
    Compensation (EC)  automatic, 0 to 50°C (32 to 122ºF) with ß=2%/°C
    Proportional Control  two independent controls: pH from 0.0 to 2.0 and conductivity (EC) from 0.0 to 2.0 mS/cm with two separate time cycles from 0 to 90 seconds
    Alarm Contact  terminals can be configured as normally open or normally closed (isolated output max. 2A, max. 240V, resistive load, 1,000,000 strokes). The alarm is activated if pH falls below the set point by the user selectable interval (0.0 to 2.0 pH), or conductivity exceeds the set point by more than the user selectable interval (0 to 2.0 mS/cm) or due to overdosage
    Dosing Terminals  two sets of independent terminals (115 to 240V, Max.2A, 1,000,000 strokes) are activated whenever pH exceeds the pH set point and/or conductivity falls below the EC set point
    Probe  any combination pH electrode with a universal BNC connector and HANNA conductivity four-ring potentiometric probe with built-in temperature sensor and DIN connector (not included)
    Power Supply  ±10% 115 VAC or 230 VAC ; 50/60 Hz
    Environment  -10 to 50°C (14 to 122°F); RH max 95% non-condensing
    Case Material  fiber-reinforced, self-extinguishing ABS
    Dimensions  221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
    Weight  1.6 kg (3.5 lb.)


    HI 7004/1L  4.01 pH Buffer Solution
    1 x 1 L bottle
    HI 7007/1L  7.01 pH Buffer Solution
    1 x 1 L bottle
    HI 7031L  1413 µS/cm EC Solution, 500 mL Bottle
    HI 7039L  5000 µS/cm EC Solution, 500 mL Bottle
    HI 7010/1L  10.01 pH Buffer Solution
    1 x 1 L bottle
    HI 3001D  Flow-thru Conductivity Probe with DIN Connection and 3 m cable

  • 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 :


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