
Instruction Manual DualScat Ex
32
10118E/5
Action
7.
If only the O-ring on the blanking glass or
plate needs to be replaced, then proceed as
follows:
1. Remove the old O-ring from the blanking
glass or plate.
2. Clean the groove (see arrow) on the blank-
ing glass or plate with a cotton bud and eth-
anol, when necessary.
3. Insert the new O-ring into the groove.
8.
Insert the blanking glass or plate with O-ring
into the opening on the Varivent housing.
9.
Place the lock ring on the blanking glass or
plate and fasten it with the closure clamp.
10.
Reattach the photometer in the product pipe.
11.
Restore the power supply to the SIREL con-
trol unit.
5.6
Recalibrating the photometer
Recalibration of the photometer can cause the readings to differ from the pre-
vious ones, because the instrument is readjusted to a fixed reference standard.
Recalibration can be carried out in either of two ways:
Recalibrate using a checking unit supplied by SIGRIST with a built-in solid
reference. This is the method we recommend.
Section 5.6.1
Recalibrate with formazine. To do so, you must be able to prepare or pro-
cure an 8 NTU standard suspension of sufficient accuracy (better than
±2%).
Section 5.6.2
Содержание DualScat Ex
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