HF scientific Micro100 Laboratory Turbidimeter - Manual (Page 10)

Micro 100 (5/10) Page 4
Rev. 3.3
Figure 2 illustrates all the items that can appear on the display.
The upper row of the display (1) is used for reporting the
turbidity levels and to provide user guidance in the customer
settings routine. The lower row of the display (2) is used to
display the stored turbidity reading and to communicate error
messages and user guidance. The display has several status
indicators (3) which distinguish the operation of the instrument.
In addition, the "LoBat" block (4) flashes when the batteries
need to be replaced. Finally, several indicators (5) provide
guidance when the customer settings routine is being used and
when the calibration routine is being used.
4.0 Routine Operation
The MICRO 100 measures and reports the turbidity of a
sample in nephelometric turbidity units (NTU).
NOTE: Nephelometric turbidity units (NTU’s) are
numerically equivalent to Formazin turbidity
units (FTU’s) (See Glossary).
Sections 4.1 and 4.2 describe how to use the MICRO 100 under normal operating conditions. These
sections include details on how to input certain customer selectable parameters and how to take normal,
routine turbidity measurements using the MICRO 100.
4.1 Grab Sample Measurement (Routine Measurement)
The following steps describe how to measure the turbidity of a sample using the MICRO 100:
1. Turn on the MICRO 100. The instrument will be in the normal mode (the "AUTO" block should
be illuminated). Allow instrument to warm up for at least 30 minutes.
2. Sample approximately 100 ml of the process stream as you would normally do for turbidity
measurement.
3. Obtain a clean and dry sample cuvette.
4. Rinse the cuvette with approximately 20 ml of the sample water (2/3 of cuvette volume), capping
the cuvette with the black light shield (cuvette top) and inverting several times. Discard the 20 ml
of used sample and repeat the rinsing procedure two more times.
5. Completely fill the rinsed cuvette (from step 4) with the remaining portion (approximately 30 ml)
of the grab sample and then cap the cuvette with the black light shield. Ensure that the outside of
the cuvette is dry, clean and free from smudges **
.
6. Place the cuvette in the MICRO 100 and index the cuvette to the lowest reading (the displayed
turbidity is continuously updated on the upper row of the display). Once the cuvette is indexed, the
reading displayed on the MICRO 100 display should be recorded as the sample turbidity (see
Glossary for more
information on indexing a cuvette).
**
Any typical glass cleaner can be used along with a lint free cloth, or tissue, to clean the outside of the cuvette.
Micro 100 LCD Display