Instruction Manual DualScat Ex
10118E/5
35
Action
13.
Stow the checking unit in the case supplied
for this purpose.
To make sure the checking unit remains in
perfect condition, always keep it protected
against dirt, moisture, frost and temperatures
above +80°C.
5.6.2
Preparations for recalibrating with formazine
To recalibrate the photometer with formazine, a suitable test setup is required.
You can use an empty standard in-line housing (
Figure 17), the lower open-
ing of which is closed off with an end plate, or the SIGRIST checking unit with
removed solid reference (two screws must be removed in this case).
Figure 17: Test setup for formazine recalibration.
Action
1.
From a formazine stock solution, prepare a dilu-
tion of 6 .. 8 NTU (calibration suspension). You
will find a recipe for producing the formazine
stock solution in the Reference Handbook.
The more accurately you know the value of the
calibration suspension, the more precisely you
will be able to recalibrate the instrument.
2.
Make sure the product pipe is empty, discon-
nect the power supply to the control unit, and
remove the photometer from the pipe.
3.
Clean the sensor head as directed in
Section 5.4.
4.
Insert the photometer into your test setup and
clamp it firmly in place. Make sure it is correctly
aligned.
Figure 8
Preparations for
formazine recalibra-
tion
Blanking glass/plate
End plate
Filling opening
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