pH/EC/TDS Multiparameter Probe for use with HI9814


The HI1285-7 is a 3-in-1 pre-amplified multiparameter probe that measures pH, EC/TDS, and temperature within a single polypropylene body. The pH portion of this probe is constructed with a cloth junction, maintenance-free polymer gel electrolyte, and a low-temperature glass sensing bulb. The EC/TDS portion of this probe utilizes two stainless steel pins for an amperometric determination of conductivity and total dissolved solids. A built-in temperature sensor ensures that both pH and EC/TDS readings are compensated for temperature variations in both standards and samples. The design consideration for the HI1285-7 is ideal for measuring the pH, EC/TDS, and temperature in greenhouses, hydroponics, and other agricultural applications. The HI1285-7 is designed for use with Hanna’s HI9814 portable multiparameter meter.

•  1 probe for pH & EC/TDS
•  Amperometric EC/TDS Sensor
•  Pre-amplified pH Electrode

Pre-Amplified pH Electrode
•  The pH electrode circuit has a built-in amplifier that serves to reduce the effects of electrical noise on the high impedance pH measurement.
•  Electrical noise can come from motors and pumps that are common in greenhouses.
•  The single reference junction design of the pH electrode has a cloth junction that allows ion movement between the inner gel electrolyte and the sample being measured.
•  The advantage of the cloth junction is that it can be extracted from the probe, exposing a fresh surface when readings become drifty or erratic.
•  These features make this probe ideal for use in fertilizer solutions.

  Amperometric EC/TDS Sensor
•  EC/TDS readings are performed by a two-pin amperometric sensor.
•  An alternating voltage is applied to the sensor and the amount of current that passes between the two stainless steel pins determines the amount of
dissolved ionic solids present.

  Built-In Temperature Sensor
•  pH and EC/TDS readings must be temperature compensated in order to obtain accurate results.
•  The built-in temperature sensor of the HI1285-7 provides a speedy temperature reading which is then used to adjust the pH and EC/TDS results accordingly.

  Polypropylene Body
•  The polypropylene body of the HI1285-7 houses all three sensors within a sturdy, single body design.
•  This body material is suitable for a wide range of applications and excels in measurements with portable meters due to its durability.
•  The fins around the spherical glass pH bulb minimizes breakage due to accidental bumping or dropping of the electrode.
•  The polypropylene plastic is a high-quality plastic that is chemically resistant to many aggressive chemicals.

  Quick Connect DIN Connector
•  The HI1285-7 uses a Quick Connect DIN connector that makes attaching and removing the probe simple and easy.
•  This type of connector is generally proprietary to the meters they are supplied with.
•  The HI1285-7 is designed for use with Hanna’s HI9814 GroLine hydroponic waterproof pH/EC/TDS/Temperature portable meter.


    Body Material                          :  polypropylene
    Reference                                :  single, Ag/AgCl
    Junction / Flow Rate               :  cloth
    Electrolyte                               :  gel
    Range                                     :  pH: 0 to 13, EC
    Max Pressure                           :  0.1 bar
    Tip Shape                               :  spheric (8 mm)
    Diameter                                 :  16 mm
    Body Length / Overall Length  :  95 mm / 185 mm
    Recommended Operating

Temperature                            :


0 to 50°C (32 to 122°F) – LT

    Temperature Sensor                :  yes
    Matching Pin                           :  no
    Amplifier                                 :  yes
    Digital                                     :  no
    Cable                                      :  7-pole; 1 m (3.3′)
    Connection                             :  Quick connect DIN
    Applications                            :  agriculture, greenhouses, hydroponics
    Warranty                                 :  6 months

Order now

To make your order, please contact us at  info@polyscientific.com.my or call us at +6 06 3350 690

Go to Top