Instrument Features - VST Lab Coffee 2 Instruction Manual

Instrument Features

The VST LAB Coffee II digital refractometers represent
a signifcant improvement in accuracy and precision over
previous models and are satisfactory for laboratory use.
Battery life is double previous models. The instruments feature
a 1,024 element detector array and sapphire prism for superior
resolution and accuracy. Precision is typically +/- 0.01-0.02%.
The two-line backlit LCD display offers improved readability.
The low-power LED backlight auto dims after 20 seconds to
preserve battery life. In newer instruments the backlight dims
during measurement to improve precision, and returns to ON
when the measurement is completed and displayed. You may
turn backlight off for longer battery life, or when batteries are
low to extend remaining life. A menu function is provided to
disable backlighting. Under typical use, without backlight, a
single set of batteries should last for 4,000 or more readings.
The instrument will automatically power OFF when idle for
three minutes. Measurements are displayed for a full three
minutes before auto-shut down.
TIP:
Hold <GO> for fi ve seconds to turn instrument OFF.
Hold <MENU> for fi ve seconds to display serial number and
fi rmware version.
The instrument reads each sample multiple times and
displays an averaged value to help eliminate noisey or erratic
measurements. A temperature stabilization software feature
prevents false calibration if the water sample temperature is
not stable during zero set.
Five languages are supported – English, French, Spanish,
German and Russian.
Accessory jackets and hard cases available for protection to
help ensure the instrument will not be damaged by excessive
shock and vibration during use or transit. High accuracy
reference solutions at 1.40% and 9.70% TDS are available at
www.VSTAPPS.com to verify instrument accuracy.
Introduction
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The VST LAB Coffee digital refractometers for Coffee &
Espresso TDS are advanced fourth-generation handheld
instruments that put laboratory precision in the palm of
your hand. Accuracy and precision of the VST LAB Coffee
refractometers are comparable to state-of-the-art dehradration
ovens, and rival benchtop laboratory refractometers with
Peltier trays. VST's latest LAB Coffee refractometers achieve
typical accuracies of +/- 0.03% and precision of +/- 0.02%.
Designed for the rapid and accurate determination of coffee
concentrations, these instruments will automatically correct for
temperature within the range of 15 - 40 °C (59 -104 °F), and
when used and cared for properly, will provide years of trouble-
free service.
This manual will help you maximize the usefulness of your
instrument, and it's recommended that it be read carefully
before use. If you have any questions, please contact VST
technical support at: support@vstapps.com
The VST LAB Coffee models are equipped with several scales
that measure coffee concentration from 0-20 % Total Dissolved
Solids. See specifi ctions for range, resolution, accuracy,
precision and temperature correction.
IMPORTANT:
When measuring espresso or coffee brewed with woven
or mesh metal fi lters, the sample must be fi ltered prior to
measurement to remove non-dissolved, suspended solids
using a coffee/espresso syringe fi lter.
Read the section about Filtering Espresso and Coffee in this
instruction sheet for more information on pre-fi ltering prior to
making measurements.
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