What are the main specification of the new XR440?

Document ID

Document ID TE11113

Version

Version 2.0

Status

Status Published

Published Date

Published Date 03/14/2019
Question
What are the main specification of the new XR440?
Summary
The old XR440 contained mercury due to its calomel reference element.
The new is mercury free.
Answer
Specifications of the new XR440 version 2017 that does not contain mercury (the other one has been phased out) :
XR440 Red rod (Ag/AgCl without KCl) reference element type, quartz fiber junction, KN03 1 M filling solution.  Reference potential versus calomel = 240 mV. Reference potential versus ENH = 484 mV. Screw cap - Protection cap filled with KNO3 1M. Ground joint :14.5/23. The nominal electrolyte outflow rate is 3 µL/hour for 10 cm electrolyte height. Tolerance are 2 –> 5 µL/hour for 10 cm electrolyte height.
 

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