Hanna Instruments HI 5315 User Manual

HI 5315

REFERENCE

Instruction Manual

HI 5315HI 5315

HI 5315

HI 5315HI 5315

Reference Electrode

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HI 5315 Reference ElectrodeHI 5315 Reference Electrode

HI 5315 Reference Electrode

HI 5315 Reference ElectrodeHI 5315 Reference Electrode

I.I.

IntroductionIntroduction

I.

Introduction

I.I.

IntroductionIntroduction
The Hanna HI 5315 reference electrode is a silver-silver
chloride double junction half-cell designed for use with ion
selective electrodes or pH sensors. The electrode utilizes a
quick flush sleeve design. The external reference electrolyte
chamber is refillable. The internal chamber is a perma­nently filled, gel stabilized, chloride containing electrolyte.

IIII

SpecificationsSpecifications

II.

Specifications

IIII

SpecificationsSpecifications
Type: Ag/AgCl
Operating Temperature: 0-85°C
Operating pH: 0 to 14 pH
Dimensions: 12 mm (OD) x 120 mm

insertion (0.47” x 4.72”)
Connection: Banana Plug
Wetted Materials: PEI

SHE

E°

(calculated): 0.238V

III.III.

Theory of operationTheory of operation

III.

Theory of operation

III.III.

Theory of operationTheory of operation
A reference half-cell provides the electrolytic contact neces­sary to permit a voltage gradient to be measured across a
measurement membrane, such as an ISE. A Ag/AgCl elec­trode is the most common type of reference. The Nernst
expression for this type half-cell is expressed in the equa­tion below. Note that the potential is a function of the
chloride concentration.

o

E=E
A chloride electrolyte completes the electrical circuit in the
inner half-cell. A bridge electrolyte is used as a buffer zone
between the inner half-cell and the sample. A small stable
liquid junction voltage is generated where the sample and
electrolyte come into contact. The size of this voltage, the
identity of the diffusing ions and how this barrier is formed
dictate stability. The barrier zone for this reference is a
narrow ring shaped opening formed between the outer
sleeve and the lower edge of the skirt shaped inner body.

- 0.059 log [Cl

AgCl

--

-

-­]

2

IVIV

..

HI 5315 design elementsHI 5315 design elements

IV

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HI 5315 design elements

IVIV

..

HI 5315 design elementsHI 5315 design elements

Upper Cap

Spring

O-Ring

Ceramic Junction
on Inner Stem

Liquid junction

V. V.

Reference Fill SolutionsReference Fill Solutions

V.

Reference Fill Solutions

V. V.

Reference Fill SolutionsReference Fill Solutions

Fill Hole

O-Ring and
Plug

The fill solution used in the external electrolyte chamber of
this electrode is replaceable. Table 1 lists Hanna‘s ion
selective electrode (ISE) offering along with the recommeded
fill solutions used when making an ion measurement. A
bottle of this solution is provided with the ISE when shipped.
The fill solutions listed will not interfere with the sensing
electrode or react with the sample. They are formulated to
minimize liquid junction potentials and to produce the
most stable and reproducible electrode potential.

ThThw b

Verify you are using the correct fill solution with your
electrode.

ab

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