Thermo Fisher Scientific TN100 Turbidimeter - Manual (Page 15)

Instruction Manual TN-100/ T-100
10
3. Turbidity Measurement
3.1
General Information
The waterproof TN-100/ T-100 turbidimeter allows you to measure the turbidity of a
grab sample. The turbidity is reported in Nephelometric Turbidity Units (NTU).
Readings above 1000 NTU are outside the range of this instrument.
NOTE: Before switching on the TN-100/ T-100 turbidimeter, a sample vial MUST
be placed in the sample well. You can use any of the calibration standards for
this purpose.
The light shield cap provided could be used to cover the vial during
measurements.
When the ON/FF key is pressed to switch on the meter, it goes through the power-up
sequence as shown in Figure 7 below.
Figure 7: Power-up Sequence
3.2
Turbidity Measurement Procedure
An accurate turbidity measurement depends on good measurement techniques.
Factors such as clean sample vials, positioning of vial in the sample well, covering the
vial with the light shield cap, meter calibration, handling of meter, and others, have to
be taken into consideration. Please see the following sections for more information.
Section 5.1: Vials – Handling, Cleaning and Care (page 16 )
Section 9: Addendum 2:
Guide to Good Measurement Technique (page 21)
CAL 13 CAL 24
mg/l
NTU
ppm
%pH
TAvg
NTU
OFF
ON
"-Rd-” flashes about 10
times indicating that the
meter goes to
measurement mode.
A reading is valid only if you have placed a
vial or any of the calibration standards
provided into the sample well.Otherwise
the reading has no meaning or an error
message "Err 8" appears.
Instrument Off
Place a sample vial or any of the
calibration standards provided into
the sample well of the meter, before
switch on.
X.x
“X.X” is software revision
number