ThermoWorks 271-401 3101 MINI SUB-AMBIENT CALIBRATOR User Manual
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2 SAFETY
Operate dry-blocks in an ambient temperature between
+50°F and 86°F (+10 and +30°C) (+15 to +25°C for optimum
accuracy) and humidity between 5 to 95% (non condensing).
Note: High humidity will cause icing of the well when operated
below zero. The fan runs continuously to moderate the
internal unit temperature. Always ensure the air vents and
fan aperture are clear and have at least 6 inches (150mm) of
space between them and any obstructions. NEVER cover the
unit while in operation or operate if the fan stops.
The calibrator can operate at high and low temperatures.
Precautions MUST be taken to prevent personal injury or
damage to surrounding objects. Probes may be hot or cold
when removed from the unit and should be placed on a heat
resistant surface and handled with care. The unit may remain
hot for several minutes after switching off. DO NOT switch off
at temperatures above +212°F (+100°C). Allow to cool before
storage.
Only place temperature probes in dry-block holes. These units
are designed to be operated dry. DO NOT introduce any liquid
into any of the dry-block holes.
These dry-blocks are designed to be rugged and durable
but contain electronics. DO NOT operate in dirty, dusty or
very damp environments or near liquids that could present a
hazard from electric shock.
Connect input power lead to only a 110-115V or 230V, 50-60
Hz (model dependant) grounded AC power supply. The unit
requires up to 200 watts of power.
3101 dry-block heat sources are programmed and calibrated
at the factory for optimum performance and should not need
adjusting. If the unit is out of calibration or is in need of repair
please return to the supplier. The dry-block unit is equipped
with an internal electrical fuse. If a fuse blows, return to the
supplier for inspection and repair. THERE ARE NO USER
SERVICEABLE PARTS INSIDE.
3 OPERATION
3.1 Parts and Controls
3.1.1 AC Power
The power cord is clamped through the rear panel of the unit
and is not removable. Plug into a standard 110-115V or 230 V
(model dependant) grounded power outlet socket.
3.1.2 Power Switch
The power switch is located on the rear panel of the unit and
is indicated with a 1 and a 0.
3.1.3 Fan
The internal fan runs continuously when the unit is operating.
This provides cooling for the internal electronic components.
Allow at least 6 inches (150mm) of space in front and behind
the unit and DO NOT obstruct any of the ventilation holes.
3.1.4 Stand
The stand can be folded flat against the under side of the unit
when not in use or if the unit is to be operated in a horizontal
position. It can be swung down and forward until it hits the
stops so that the unit can be used in an inclined position. The
stand was not designed to be a carrying handle and should
NOT be forced past the stops for this purpose.
3.1.5 Dry-Block
The aluminum temperature well is accessible from the
front panel. The dry-well model 3101 is designed to accept
five different probe sizes: 1/8" (3.3mm), 5/32" (4.1mm),
3/16"(4.8mm), ¼" (6.4mm), and 3/8" (9.6mm). Two inserts
are included with each unit: 1/8" (3.3mm) and 3/16" (4.8mm).
These inserts can be carefully removed and additional sizes
may be purchased.
3.1.6 Temperature Controller
In normal operating mode the numeric LED display shows
the actual block temperature. A Control Output Indicator light
is located in the top left corner of the display. This indicates
the on/off state of the heating/cooling element in the block.
To show the set point temperature in the display press and
release either the up or down arrow button. Press and hold
either the up or down arrow button to change the set-point
value. All other functions of the controller have been factory
set and locked to maintain accuracy and repeatability.