HF scientific 19944 Triple Validation Turbidimeter - 0-100 NTU - Manual (Page 21)

TVT2 (5/02)
Rev. 1.7 (.pdf) 16
7.0 Instrument Configuration (Range)
In order to reduce maintenance during calibration, all TVT’s are shipped from the factory
with a range of 0-10 NTU. The instrument is capable of, and has been factory calibrated
for a range of 0-100 NTU. It is recommended that this higher range not be used unless
needed.
7.1 0-100 NTU Range Selection
To select this range, loosen the four front panel screws and pull the front chassis forward
about 10 cm (4 inches). On the inside of the front panel there is a shorting strap taped to
the surface. Remove the strap, and pull off and discard all the tape. Locate the selection
jumpers on the printed circuit board, just above the desiccant cartridge. Place the shorting
strap on the very front two pins, numbered 4. The instrument must be reset to recognize
the change in configuration. If the instrument is under power, press the small push button
labeled S1 on the left front of the printed circuit board. If the instrument is not under
power, the TVT will recognize the change when power is applied. Close up the
instrument by sliding the chassis back into the cover and tightening the four front panel
screws.
When calibrating with the 0-100 range, be sure to read in entirety the calibration
instructions (see section 5.2).
8.0 Instrument Configuration (SETUP Mode)
The instrument has been designed to provide you with the ability to customize your
instrument according to your needs at any time during normal operation. This mode has
been split into sub-menus to facilitate instrument configuration. This section describes
how you can use each of the sub-menus to configure your instrument
Enter the SETUP mode of the instrument by pressing the MODE button until SETUP is
illuminated, then press the
↵
button.
Note: To skip the selection of the SETUP mode, simply press the MODE button.
8.1 Displayed Resolution
The instrument is equipped with the ability to display several levels of resolution. The
instrument can display up to four digits to the right of the decimal place for turbidity
readings below 10 NTU. If you feel that the last digit, or two, is not stable then you may
adjust the resolution to not show these digits. Upon entering the SETUP mode the lower
row of the display will show “RES” and the upper row of the display will show the
number of digits that will be displayed.