eutech-instruments orp electrode Manuel D’Utilisation

 

 
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 @ 25

o

C. 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.