HI12883 is a 3-in-1 pre-amplified multiparameter probe that measures pH, EC/TDS, and temperature in a single polypropylene body. The pH portion of the probe is constructed of a cloth junction, maintenance-free polymer gel electrolyte, and a low-temperature glass sensing bulb. The EC/TDS portion of the probe utilizes two graphite sensors to electrochemically determine conductivity and total dissolved solids. A built-in temperature sensor ensures that both pH and EC/TDS readings are compensated for temperature changes in standards and samples.

Pre-Amplified pH Electrode

The pH electrode circuit has a built-in amplifier to reduce the effects of electrical noise on high-impedance pH measurements. Electrical noise can come from motors and pumps commonly found in greenhouses. The pH electrode's single reference junction design features a cloth junction that allows ions to move between the internal gel electrolyte and the sample being measured. The advantage of the cloth junction is that it can be extracted from the probe to expose a fresh surface when readings become drifting or unstable. These features make this probe ideal for use in fertilizer solutions.

Electrochemical/C/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 to obtain accurate results. The built-in temperature sensor of the HI1288 provides fast temperature readings, which are then used to adjust the pH and EC/TDS results accordingly.

Polypropylene Body

The polypropylene body of the HI12883 features a rugged, one-piece design that houses all three sensors. This body material is suitable for a wide range of applications and, due to its durability, excels in measurements with portable meters. Fins around the spherical glass pH bulb minimize breakage from accidental impact or dropping of the electrode. Polypropylene plastic is a high-quality plastic with chemical resistance to many corrosive chemicals.

Quick-Connect DIN Connector

The HI12883 uses a quick-connect DIN connector. This type of connector is usually proprietary to the meter with which it is supplied and may not be interchangeable. The HI1288 is suitable for Hanna's HI991300 and HI991301 portable multiparameter meters.