HANNA HI11311 - Digital pH/Temperature Electrode

HANNA HI11311 - Digital pH/Temperature Electrode with Matching Pin

The HI11311 is a glass body, refillable, double junction pH electrode with a matching pin. The matching pin is for the Sensor Check™ capability of the edge pH meter which is used to identify problems with the pH electrode including if there is a crack in the pH electrode and the condition of the reference junction. This electrode includes a built-in temperature sensor for temperature compensated measurements in a single probe design. Within the probe there is an integrated microchip that stores calibration data, electrode type, and serial number, which allows for changing of sensors without having to recalibrate. The HI11311 is a general purpose pH electrode and is designed for use with Hanna’s edge® pH/EC/DO meter

Matching Pin

Spherical Glass Tip

Double Junction Reference

Details

Matching Pin

The HI11311 integrates a matching pin into the electrode and is part of the Hanna Instruments Sensor Check™ feature. The matching pin checks the impedance across the indicating and reference electrodes. This allows the edge meter to alert the user in the event that the glass of the indicating pH electrode is cracked and the condition of the reference junction.

Built-in Microchip

The built-in microchip stores sensor type, serial number and calibration information including date, time, offset, slope, probe condition and buffers used. This information is automatically retrieved by edge® once the electrode is plugged in. The ability to transfer information allows for hot swapping of probes without having to recalibrate. 

All pH measurements are performed within the electrode and transferred digitally to the meter. This overcomes any noise issues associated with the traditional high impedance analog measuring system. Electrical noise can be generated from a built in temperature sensor and while working in a humid environment.

Spherical Glass Tip

The spherical shaped tip design allows for a wide area of contact with the sample. This permits a faster electrode response with a higher degree of stability. The 11311 utilizes a general purpose (GP) glass formulation, which has a resistance of approximately 100 megaohms. This means that measuring conditions are optimal around ambient temperatures. Use of high or low temperature glass around ambient temperatures would not be optimal due to a long response time or a shortened lifespan of the electrode.

Double Junction Reference

A double junction electrode has an internal compartment surrounding the reference wire. Silver ions are present in the electrolyte of the internal compartment, which houses the Ag/AgCl reference wire; the electrolyte outside this compartment is silver free. The double junction design means that virtually no silver from the electrode enters the sample. This design allows measurement in applications where silver ions in the sample are undesirable or silver precipitates on the junction are likely to form.

Glass Electrode Body

The glass electrode body is suitable for a wide range of applications due to its chemical resistance. The glass electrode is compatible with many non-aqueous solvents and other aggressive chemicals. Glass is also resistant to many forms of radiation, such as ultraviolet radiation.

Features at-a-glance:

• Digital, microprocessor based - no high impedance signal to the meter
• Built-in temperature sensor - no need for an additional temperature probe
• 3.5mm digital plug - easy to plug in, no alignment necessary
• Double junction reference - eliminates silver precipitates and clogged junctions
• Matching pin - detects broken electrodes

Specifications

Body Material	glass
Reference	double
Junction / Flow Rate	ceramic, single / 15-20 μL/h
Electrolyte	3.5M KCl
Range	pH: 0 to 13
Max Pressure	0.1 bar
Tip Shape	spheric (dia: 9.5 mm)
Diameter	12 mm
Body Length / Overall Length	120 mm / 195 mm
Recommended Operating Temperature	-5 to 100°C (23 to 212°F)
Temperature Sensor	yes
Matching Pin	yes
Amplifier	no
Digital	yes
Cable	1 m (3.3')
Connection	3.5 mm connector
Applications	general purpose, laboratory general purpose, tris buffer