Apera Instruments LabSen 851-H User manual

LabSen® 851-H pH Electrode for Strong Alkaline

and Viscous Solutions

User Manual

LabSen® pH electrodes are made with proprietary sensor technologies and key components from

Switzerland. LabSen® 851-H pH electrode is designed for high-accuracy pH measurement of strong

alkaline and highly viscous solutions.

Features

•The sturdy HA membrane is made for strong alkaline and high temperature solutions.

•The pre-pressurized structure allows the electrolyte to stably flow out even in highly viscous

samples so as to ensure reliable measurements.

•Blue gel inner solution - does not flow and will not generate air bubbles.

Technical Specifications

Measuring Range

0-14 pH

Temperature Range

0-130°C

Body Material

Lead-free Glass

Reference

Pre-pressurized Silver ion trap

Junction

Ceramic

Membrane Type

Membrane Resistance

<500MΩ

Reference Solution

Gel KCL

Soaking Solution

3M KCL

Electrode Dimension

Ø12×120 mm

Connector

BNC

Cable

Ø3mm×1m

How to use

1. Connect the electrode to the BNC connector of your pH meter.

2. Before measuring, twist off the storage bottle cap (see graph on the right), pull

out the electrode and rinse it off with distilled or deionized water.

3. Perform at least a two-point calibration before measuring after connecting the

new electrode to your pH meter.

4. After using, put the electrode back into the storage bottle and twist on the bottle

cap.

Maintenance

1. When not in use, the electrode should be soaked in the storage bottle containing 3M KCL soaking

solution to keep the glass membrane and junction in a healthy condition. Clean the bottle and replace

the soaking solution if it gets contaminated. The electrode should never be stored in pure water such

as deionized or distilled water.

2. The electrode is only as accurate as it is clean. Always thoroughly rinse off the probe before and after

each measurement with pure water in a container or with a wash bottle.

3. For tough contaminants, soak the electrode in Apera cleaning solution (AI1166) for 30 minutes. Then

use a soft brush to remove the contaminants. Afterwards, soak the electrode in 3M KCL soaking

solution for at least 1 hour. Rinse it off, then re-calibrate it before using again.

4. The connector of the electrode should be kept clean and dry. If contaminated, please clean it with

medical cotton and isopropyl alcohol and blow-dry it to prevent short circuit of the electrode or slow

response of the electrode.

5. The electrode should avoid testing strong acid as well as dehydrating media such as absolute ethanol

and concentrated sulfuric acid. If testing such solutions, the immersion time should be minimized and

the electrode should be carefully cleaned after use.

6. Every pH electrode will eventually age and fail. The typical service life of Apera pH electrodes is 12-

24 months depending on the frequency of usage and how well you keep it clean and properly stored.

We recommend replacing your electrode every 12-18 months to ensure the best accuracy.

Warranty

We warrant this electrode to be free from defects in material and workmanship and agree to repair or

replace free of charge, at option of APERA INSTRUMENTS (Europe) GmbH, any malfunctioned or

damaged product attributable to responsibility of APERA INSTRUMENTS (Europe) GmbH for a period of

six months from delivery. Warranty period is the time limit to provide free service for the products

purchased by customers, not the service life of the tester or electrodes.

This limited warranty does not cover any damages due to:

Transportation; storage; improper use; failure to follow the product instructions or to perform any

preventive maintenance; modifications; combination or use with any products, materials, processes,

systems, or other matter not provided or authorized in writing by us; unauthorized repair; normal wear

and tear; or external causes such as accidents, abuse, or other actions or events beyond our reasonable

control.

APERA INSTRUMENTS (Europe) GmbH

Address: Wilhelm-Muthmann-Str. 18

42329 Wuppertal, Germany

Tel.: +49 202 51988998

Website: aperainst.de

Email: info@aperainst.de

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