Hach-Lange 5338 User Manual [en, de, es, fr, it]

pH

53 38

pH

53 38

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Key points. Hauptteile.
Puntos clave. Points clé.
Punti chiave. Pontos chaves.

Fixed cable (standard 3m).

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Festes Kabel (Standard 3 m).

Cable fijo (estándard 3m).

Câble fixe (standard 3m).

Cavo fisso (standard 3m).

Cabo fixo (padrão 3m).

PG 13.5 thread.

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Montagegewinde PG 13,5.

Rosca de sujeción PG 13,5.

Filetage PG 13,5.

Filettatura PG 13,5.

Rosca de fixação PG 13,5.

Reference element.

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Referenzelement.

Elemento de referencia.

Élément de référence.

Elemento di riferimento.

Elemento de referência.

Gel electrolyte.

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Elektrolytgel.

Electrolito gel.

Électrolyte gel.

Elettrolita gel.

Eletrólito em gel.

Diaphragm: ceramic.

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Diaphragma: Keramik.

Diafragma: cerámico.

Diaphragme: céramique.

Diaframma: ceramico.

Diafragma: cerâmico.

Sensitive glass membrane.

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Sensitive Glasmembran.

Membrana sensible.

Membrane sensible.

Membrana sensibile.

Membrana sensível de vidro.

Storage protector.

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Lagerungsschutz.

Protector de almacenamiento.

Tube protecteur de stockage.

Protettore per la conservazione.

Protetor para armazenamento.

(EU Directive 2002/96/EC)

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pH electrode 53 38

Introduction

The 53 38 is a pH electrode for general
use. Low maintenance electrode, as it
does not require monitoring of electro­lyte level.

SAFETY NOTE
Before use with hazardous substanc­es, find out about the relevant haz­ards, protective measures, and what
to do in an emergency.

Electrode preparation

• Remove the storage protector

• Verify that there are not air bubbles

inside the membrane
removed by shaking the electrode as a
clinical thermometer.

Installation

In immersion, insertion, flotation housings,
etc. with PG 13,5 thread.

See Housing instruction manual.

In some cases the electrode is installed,
with the help of sockets and adapters,
directly onto pipes.

Calibration

See pH-meter instruction manual.

Measurements. Recommendations

See pH-meter instruction manual.
Ensure that the electrode’s specifications
are adapted to the process.
Sample must cover the diaphragm

Maintenance

• Deposits forming on the electrodes,

caused by continual exposure of the sen­sors to a dirty or contaminated medium, is
one of the most frequent causes of prob­lems when measuring pH. When possible
it’s recommended to use a housing with
automatic sensor cleaning system.

• When an electrode gets contaminated,

the simple rinsing with distilled water is
not suffi cient. The most suitable clean­ing solution is one which acts in a more
selective way over the contamination
(look for regeneration solutions).

• Re-hydration. A “dry” electrode re-

covers by immersing it in diluted HCl
solution for several hours. It is recom­mended to read the information sup­plied with the electrode’s regenerating
solutions.

Troubleshooting

... the meter always shows the same pH

value.
Short circuit in the electrode or cable.
Replace the electrode.

... shifting of pH values.

Reference system contamination.

Replace the electrode.

... unstable reading.

Diaphragm blockage.

Clean, regenerate, replace the elec­trode.

... impossible to perform calibration.

.

. They can be

.

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GB

... very slow response.

Dirt on the diaphragm or the mem­brane.
De-hydrated membrane.
Electrode ageing or wear.

Clean, regenerate, replace the elec­trode.

Storage

Place the electrode in the storage protec­tor with KCl 3M.

Life of an electrode

The average life expectancy of a pH pro­cess electrode oscillates between 6 or 12
months, depending on the working con­ditions (in standard applications).
Electrodes exposed to high temperatures
do not last as long. Very alkaline mediums
also reduces the life span of electrodes.

If an electrode has too short life span,
less than three months, ask us about it.
Probably there is a more suitable elec­trode for the application.

Specifications

Measuring range 0 to 14 pH
Operating temp. 0 to 80 °C
Max. pressure 2 bar
Reference element Ag/AgCl wire
Diaphragm ceramic
Electrolyte gel

Body material

Thread PG 13,5
Connector —
Min. immersion

depth

interior glass /

ext. polycarbonate

17 mm

Applications

Swimming pools, drinking waters.
Aqueous samples in general.

Limitations

Low conductivity, dirty or viscous solutions.
Products with colloids or solids in suspen­sion. Samples containing substances which
react with the silver ion.

CERTIFICATE OF QUALITY

The attached electrode 53 38 has passed
the quality test and follows the next speci­fications:

• Asymmetry potential < ± 15 mV.

• Sensitivity, pH 4 to 7 (at 25 ˚C) > 98%.

• Response time, pH 4 to 7 < 20 s.

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