Menu Options
Various options are accessible through the <MENU>
button. With the instrument “ON”, press and release
<MENU> to step through the options.
COFFEE % TDS – press [GO] to Set
This option sets the default unit of measure, or scale,
the instrument will read. Some instruments are
programmed with more than one scale, or a separate
ESPRESSO % TDS scale. Later revision instruments
have a single COFFEE % TDS scale that covers the
entire range of coffee through espresso. Pressing
<MENU> will step through all available scales. Press
<GO> to set the a scale as the default.
SET ZERO? – press [GO] to Set
The Zero Set option will zero or calibrate the
instrument to pure water. See “Calibration - Zero Set.”
Set Span? – press [GO] to Set
The Span Set option will calibrate the upper range of
the instrument to a special calibration solution. See
“Calibration - Span Set.”
LCD-Light? – press [GO] YES
This option allows you to turn the LCD display
backlight on or off. The options are “Yes” and “NO.” Later
revision instruments turn backlight OFF momentarily
during read.
Language? – press [GO] to Set
This option allows you to set the display to a particular
language; English, Spanish, German, French, or
Russian. Just follow the prompts to your language of
choice and press <GO> to set.
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Follow the steps below to accurately measure a coffee or
espresso sample:
Taking a Measurement
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Inspect the measuring surface to make sure
it is clean and dry. Place a few drops of the
sample to be tested on the measuring surface.
The instrument need not be on.
Close the sample cover and allow some time
for the temperature to equalize. A good rule-
of-thumb is to wait 10 to 20 seconds for the
sample to equilibrate to the temperature
of the instrument.
A single press and release of <GO> will turn
the instrument on.
Press <GO> a second time to start the mea-
surement. The display will indicate Coffee %
TDS or Espresso % TDS on the fi rst line of the
display and * READING * on the second line.
On later revisions backlight turns OFF mo-
mentarily during a measurement.
Notes:
The instrument will not take a measurement
if it detects the sample was at a signifi cantly
different temperature than the prism. An error
message “TEMPERATURE STABLE ERROR”
will be displayed.
The reading will take approximately 2-3
seconds and the result displayed on the
screen is the average of several
measurements.
Contact VST at support@vstapps.com
for calibration reference fl uids.
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