ETI Dry-Well 3101 User manual

3101 Dry-Well
heat/cool source calibrator
User Manual
order code: 271-401

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CONTENTS
Introduction 4
safety 4
parts & control 5
power lead 5
power switch 5
fan 6
stand 6
dry-well 6
temperature controller 6
operation 7
temperature setting 7
probe testing 7
maintenance 8
care of the 3101 Dry-Well 8
warranty 8
specification 9

4
INTRODUCTION
The 3101 dry-well heat source allows users to check the accuracy of
thermometers and sensors as a system, on site, without the need for
heavy, expensive equipment. The dry-well is a high accuracy portable
heat source that is extremely easy to use. Simply plug in, switch on and
set the dry-well to the temperature that you wish to check, insert your
probe into the correct size well and take the reading. Compare the
temperature reading of your thermometer and probe to the displayed
temperature of the dry-well and the difference is the error of your
instrument. For optimum accuracy and UKAS traceability use an ETI
Reference Thermometer or similar to make comparison measurements.
The 3101 dry-well is controlled by a closed loop microprocessor based
digital PID temperature controller system incorporating a combination
heater/cooler and a precision platinum RTD sensor housed in the
aluminium block. Fan cooling allows rapid changes in well temperature
upon demand. The required temperature may be adjusted in 0.1 °C
increments across the range of the instrument using the buttons on the
front panel.
These units are ideal for use in a variety of industrial and process
applications. Each unit is supplied with a traceable certificate of
calibration showing actual test data, which can be used as part of quality
assurance programmes.
SAFETY
Operate the dry-well in an ambient temperature between 10 and 30 °C
(15 to 25 °C for optimum accuracy) and humidity between 5 to 95 %
(non condensing). The fan runs continuously to moderate the internal
unit temperature. Always ensure the air vents and fan aperture are clear
and have at least 150 mm of space between them and any obstructions.
NEVER cover the unit while in operation or operate if the fan stops. If
the equipment is used in a manner not specified by the manufacturer,
the protection by the equipment may be impaired.
!The calibrator can operate at very high temperatures. Precautions
MUST be taken to prevent personal injury or damage to
surrounding objects. Probes may be hot when removed from the unit and
should be placed on a heat resistant surface. The unit may remain hot for

5
!
several minutes after switching off. DO NOT switch off at temperatures
above 100 °C. Allow to cool before storage.
Care must be taken when removing probes and inserts from the
unit. If the unit is set at a high temperature the inserts will be very
hot and could cause burns to the hands. Please use the insert removal
tool supplied. After removal place hot probes and inserts only on a
suitable heat proof surface.
Only place inserts and temperature probes in dry-well holes. This unit
is designed to be operated dry. DO NOT introduce any liquid into any
of the dry-well holes.
These dry-wells 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.
The power supply with this instrument should be connected to grounded
AC power supply (100 - 240VAC 50/60Hz). The unit requires ≤160
watts of power. Mains plug fuse rating is 3 amps.
The 3101 dry-well heat source is 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-well 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.
PARTS AND CONTROLS
POWER SUPPLY
The power supply for this instrument should be connected to grounded
AC power supply (100 - 240VAC 50/60Hz). The output of the power
supply is 12VDC 8.5A (102W).
POWER SWITCH
The power switch is located on the rear panel of the unit and operation is
indicated with a 1 and a 0. DO NOT introduce any liquid into any part of
the instrument.
FAN
The internal fan runs continuously when the unit is operating. This
provides cooling for the internal electronic components and the heatsink.

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It is a 2-speed fan and at lower set point temperatures the fan speed
will increase (shown by indicator 02 on the controller).
Allow at least 150 mm of space all around the unit and DO NOT obstruct
any of the ventilation holes.
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.
DRY-WELL
The aluminium dry-well is located on the front panel. The dry-well is
designed to accept two inserts: Ø4.8 and 6.4 mm as standard. Other
inserts are available to suit standard probe diameters. Use the nearest,
larger size insert to the probe diameter being checked. The inserts are
a close fit in the dry-well to give good thermal conduction. Keep the
inserts clean and avoid damage by storing carefully. The inserts MUST
be regularly removed and cleaned to ensure they do not seize in the
dry-well. DO NOT introduce any liquids or substance into the dry-well
or inserts as this may result in the inserts lodging in the dry-well.
TEMPERATURE CONTROLLER
In normal operating mode the numeric LED display shows the actual
well temperature. A Control Output Indicator light (O1) is located in
the top left corner of the display. This indicates when the unit is in heat
mode or when the unit is controlling within the proportional control band.
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.
A shift can be entered into the controller by pressing the scroll (left-hand)
button. Press and hold either the up or down arrow button (˄˅) to
change the shift value. A factory set value will be entered at the time of
certification. The shift value should only be adjusted if the unit is being
monitored by an ETI Reference Thermometer or similar.
All other functions of the controller have been factory set and locked to
maintain accuracy and repeatability.

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OPERATION
DRY-WELL SET-UP
Place the dry-well unit on a flat level surface with at least 150 mm of
space all round. The stand may be swung out to lift the front of the unit.
Plug the power supply lead into a suitable grounded AC power outlet
socket. Check for and remove any foreign objects prior to switching
on. Turn the instrument on using the switch located on the rear panel,
below the power lead. The fan will start immediately and the controller
display will illuminate after approximately three seconds.
TEMPERATURE SETTING
The dry-well may be set to any temperature between -10 to 110 °C in
0.1 °C increments (see 'Temperature Controller' section for details). The
control will cause the unit to heat or cool to the set point temperature.
The dry-well temperature is displayed in operation. A small overshoot and
undershoot will occur when the well reaches the set point temperature.
10 minutes is normally required to reach a higher set point temperature.
It will take longer to reach a lower set point temperature. Once the set
point temperature is reached, a further 10 minutes should be allowed
for stability to be achieved. For optimum accuracy and stability allow
the unit to warm up for 30 minutes after power up. The displayed well
temperature should stay within ±0.5 °C of the set point temperature.
PROBE TESTING
Insert the probe to be tested into one of the holes in the dry-well. The
probe should be a snug fit for good heat transfer but should not be so
tight that it cannot be removed easily. Best results will be obtained when
the probe is inserted to the full depth of the dry-well hole of closest size
to the probe diameter. Allow the reading from the probe to stabilise
and then compare the reading with either the temperature controller
display or an external reference thermometer. For optimum comparison
accuracy use a high precision ETI Reference Thermometer or similar.
If probes with a large mass are inserted into the dry-well holes the unit
will require up to 10 to 15 minutes to re-stabilise.

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MAINTENANCE
CARE OF THE 3101 DRY-WELL
The 3101 dry-well requires very little maintenance. Avoid operation in
dusty, dirty, oily or wet environments. If the case becomes dirty it may be
cleaned using a damp cloth and mild detergent. Do not allow moisture
to enter the case. It is important to check for and remove any foreign
objects in the dry-well holes.
WARNING: Never introduce any fluids or other foreign material into
the dry-well. This will damage the dry-well and could cause probes to
become lodged. It could also cause a potential electric shock. In the
event that the heat source should require service or repair, please contact
ETI for assistance. There are no user serviceable parts inside and any
attempted repair will void any guarantee.
GUARANTEE
This instrument carries a one-year guarantee against defects in either
components or workmanship. During this period, products that prove to
be defective will, at the discretion of ETI, be either repaired or replaced
without charge. The product guarantee does not cover damage caused
by fair wear and tear, abnormal storage conditions, incorrect use,
accidental misuse, abuse, neglect, misapplication or modification.
Full details of liability are available within ETI's Terms & Conditions
of Sale at www.etiltd.com/terms. In line with our policy of continuous
development, we reserve the right to amend our product specification
without prior notice.

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SPECIFICATION
temperature range -10 to 110 °C (at 20 °C ambient)
resolution 0.1 °C
accuracy -10 to 99.9 °C ±0.5 °C
100 to 110 °C ±1 °C
holes greater than 6.35 mm ±2.0 °C
stability ±0.5 °C
heating times ambient to 100 °C after 10 minutes
stabilisation 5 minutes
cooling times ambient to 0 °C after 10 minutes
hole dimensions* 2 x Ø13 mm that will accept various inserts
inserts each unit is supplied with two inserts of
customer's choice
well depth 100 mm
power supply Input:- 100-240 Volt AC (50/60 Hz) 160W
Output:- 12Volt DC 8.5A (102W)
display 10 mm LED
case dimensions 89 x 152 x 186 mm
weight 1800 grams
*hole dimensions given are nominal

Serial No. _____________________________________________________
Calibrated by ________________________Date _____________________
This instrument has been checked or calibrated against reference instrument(s) calibrated
by a UKAS Accredited Calibration Laboratory at -10 °C, 0 °C and 100 °C.
To BS EN 60584
INSTRUMENT RECORD CARD
3101 Dry-Well order code 271-401
manufactured by
Electronic Temperature Instruments Ltd
Easting Close, Worthing, West Sussex BN14 8HQ
tel: [phone] · fax: [phone]
email: [email protected] · www.etiltd.com
545-125/25.11.14