EUTECH INSTRUMENTS ORP ELECTRODE Bedienungsanleitung

INSTRUCTION SHEET FOR

ORP ELECTRODE

INTRODUCTION

ORP electrodes use inert platinum or gold as their sensor element. A double-junction ORP

electrode has an internal reference element which is isolated within a second chamber,

minimizing contamination from sample media containing sulphides. They are designed for

maximum reliability, accuracy, and ease of use. The electrodes are housed in a high-grade epoxy-

body or Ryton housing resistant to a wide range of solutions and come with a BNC connector in

different cable lengths. These ORP electrodes are recommended for precision ORP/Redox

measurement in laboratory and for on-line applications.

Unlike pH electrodes, ORP electrodes cannot be standardized against buffers. Like pH electrodes,

ORP electrodes are subjected to coating and abrasion by the measured media and in some

instances are poisoned by chemicals which may be present. To improve the reliability of ORP

measurements and performance, testing of ORP electrodes in standard potential solutions helps

determine if electrodes are responding correctly or need maintenance.

PREPARATION & CHECKING OF ELECTRODE

Set instrument to millivolt (mV) mode. Check the electrode with 475mV ORP solution. It should

read 475mV ±25mV @ 25oC. Please dry the electrode sensor in air before taking reading. If it

does not read properly, clean electrode as mentioned below.

CLEANING OF PLATINUM PIN

Flush ORP electrode with deionized water and immerse in bleach for about 30 minutes. Repeat

cleaning procedure if reading is out of specification.

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