Measurement
36
Preprocessing
Removing fine particles
If the sample water contains fine particles or other impurities, use an ashless cellulose
quantitative filter paper (particle retention: 8
m) to remove the impurities before dispensing
the sample into the product.
Fig. 35 Removal of fine particles
Performing preliminary extraction outside the product
For the following types of sample water, perform extraction outside the product prior to
dispensing the sample into the product.
Sample water that has an oil membrane or oil drops floating on the surface
It cannot be measured in a measuring utensil. Extraction must be performed using the
entire sample.
Sample water containing large amounts of suspended material (sand, organic materials,
etc.)
It will clog the measuring utensil or internal filter, and may damage the measuring utensil
or the product.
Sample water that is difficult to separate from the solvent after extraction (sample water
containing emulsifying substances)
If any incompletely separated solvent is sent to the water filter, emulsifying substances or
water content in the solvent may cause clogging in the water filter and an accurate
measurement will not be possible.
Reference
"Examples of measurement by extraction outside the product" (page 48)
Points to check prior to measurement
Did you perform calibration?
If not, first perform zero calibration, then perform span calibration.
Is the warm-up icon off?
If the warm-up icon is blinking, wait until it turns off.
Is the alarm icon off?
If the alarm icon is blinking, check the error information and remove
the cause (refer to "List of alarms" (page 106)).
Are the beakers for drainage in place?
If not, set the beakers for drainage in place (refer to "Placing the
beakers for drainage" (page 20)).
