Metrohm 899 Coulometer - Manual (Page 24)

3.3 Connecting the coulometer to the power supply
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899 Coulometer
6 Connect the tubing for the aspiration of the coulometer cell at the
lower connector of the addition and aspiration tube (6).
Details regarding how to connect the addition tubing and the aspiration
tubing can be found in the manual for the 803 Ti Stand.
3.2.4 Using the coulometer cell with a Karl Fischer oven
When samples release their water only slowly or only at higher tempera-
tures, the oven method is used. The sample is heated in a KF oven (e.g.
860 KF Thermoprep) and the water that is released is guided with a carrier
gas into the coulometer cell. You will find recommended parameter set-
tings for determinations with a Karl Fischer oven in chapter 10.5, page
97.
A detailed description of setting up the coulometer cell with the KF oven
can be found in the respective manual.
3.2.5 Using the coulometer cell with a sample changer
When there is a large number of samples, the determination of the water
content can be automated with the aid of a sample changer with oven
module (e.g. 885 Compact Oven SC). You will find recommended para-
meter settings for determinations with a Karl Fischer oven in chapter 10.5,
page 97.
A detailed description of setting up the coulometer cell with the sample
changer can be found in the respective manual.
3.3 Connecting the coulometer to the power supply
You can supply the 899 Coulometer with electricity two different ways:
￭ Connect the coulometer directly to the mains supply with the aid of
the power supply unit provided.
￭ Connect the coulometer to the 6.2164.500 Power Box if no stable
mains supply is available.
3.3.1 Connecting the power supply unit
The 899 Coulometer has an external power supply unit for a 24 V power
supply (DC). This is connected to the mains connection of the Coulometer.
Warning
An incorrect mains voltage can damage the instrument.
Operate the instrument only with the mains voltage specified for it. Use
the supplied power supply unit exclusively.