Fluke 1521, 1522 Specifications
Handheld Thermometer Readouts
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Read PRTs/RTDs to ±0.025 °C and thermistors to ±0.005 °C
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Model 1522 stores multiple data sets totaling 10,000 readings
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INFO-CON connector allows interchangeable use of calibrated probes
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INFO-CON eliminates errors from programming probe data
With the Super-Thermometer, Black
Stack, and Tweener thermometers, Hart
established itself as the clear product
leader for thermometer readouts. Our pat
tern of offering more power and more
versatility for less money is indisputable.
Another case in point: Hart offers the two
most powerful handheld thermometers in
the world.
The Models 1521 and 1522 are the
first standards thermometers to fit into a
battery-powered handheld package.
They’re as accurate as ±0.005 °C! You’ll
only find this level of accuracy in large
desktop units that cost three times more.
It’s no wonder we call the 1521 the Little
Lord Kelvin of thermometry.
Fitting easily into your hand and
weighing only 0.4 kg (1 pound), these
thermometers can go anywhere. And
when they get there, you can have total
confidence in the accuracy of your mea
surements. The 1522 has the power of a
full data logger, with memory to hold
10,000 readings.
been favored as temperature standards.
From –200 °C to 100 °C, the 1521 reads
PRTs accurately to ±0.025 °C. Even at
800 °C these are high-precision readouts,
accurate to ±0.1 °C.
Ultra-stable thermistors offer excellent
stability and even greater accuracies over
a more narrow range—typically from
about –10 °C to 110 °C. At temperatures
below 50 °C, these Handheld Thermome
ters read thermistors to ±0.005 °C. Accu
racy at 100 °C is ±0.02 °C.
While a small number of handheld
thermometers on the market offer 0.01 °
resolution,theyfailtoprovidetheaccu
racy necessary for the last digit to be
meaningful. Hart’s Handheld Thermome
ters let you select resolution from 0.1 ° to
0.001 ° and offer the accuracy to support
even 0.001 ° resolution.
Of course, the 1521 and 1522 let you
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match the exact resistance-versus-tem
perature characteristics of an individually
calibrated probe. This is true standards
thermometry. Hart’s Handheld Thermom
eters read ITS-90, Callendar-Van Dusen,
Probes
The 1521 and 1522 read both Pt-25 and
Pt-100 RTDs as well as thermistors.
PRTs and RTDs, with their wide tem
perature ranges and stabilities, have long
or Steinhart-Hart coefficients for maxi
mum system accuracy. These are real al
gorithms, not approximating conversion
methods or electronic look-up tables. If
you want to use common industrial
curves, RTDs can be read using the com
mon DIN 43760 (IEC 751) curve and
thermistors can be read using the YSI 400
curve.
INFO-CON Connectors
Probes attach to the 1521 and 1522 us
ing Hart’s own “INFO-CON” connector.
The INFO-CON (partially based on U.S.
Patent 5,857,777) allows you to change
the probes you use without requiring you
to reprogram your readout. A memory
chip in the INFO-CON stores all the critical
information about your probe, including
its serial number, recall date, and calibra
tion constants.
When you connect your probe, the
1521 automatically recognizes whether
you’re using an RTD or thermistor and
downloads the calibration constants and
type of conversion specific to your probe. It
also checks the recall date stored in the
INFO-CON to verify it has not expired. To
dedicate a single probe to your readout,
disable the password-protected interchangeability function and your thermometer will read only the probe you specify.
Forget entering calibration constants
yourself, and don’t worry about the mistakes that can so easily occur during that
process. You don’t even need to select
your sensor type. It’s all stored in the
INFO-CON. Just plug in your probe and
you’re ready to take readings. It doesn’t
get any easier.
Information is loaded into the memory of
the INFO-CON by Hart when you purchase
a probe or have a probe recalibrated by
Hart. Alternatively, you may load your own
information into an INFO-CON through the
Handheld Thermometer or through Model
9934 LogWare (see page 87).
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If you’d like to use a Hart Handheld
Thermometer with probes you already
own, no problem! Spare connectors are
available. They easily connect to your
probes, and you can program them
yourself.
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1521 Little Lord Kelvin
The 1521 Little Lord Kelvin uses a menu
system for convenient access to all func
tions. Calibration and sensor program
ming functions are password protected to
help prevent unauthorized access.
“Min” and “Max” functions store the
lowest and highest readings since the
last reset. The “Hold” function freezes and
stores the current reading (up to six may
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be stored) for later recall. And the “Delta”
function computes the difference be
tween the current reading and a refer
ence value, which may be recorded at
any time.
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54 Thermometry
Handheld Thermometer Readouts
INFO-CON
Each thermometer comes complete
with rechargeable nickel-metal-hydride
batteries, an AC adapter/charger, an RS232 cable for connecting to your PC, and
a spare INFO-CON connector. Every unit
also includes a NIST-traceable calibration
with actual resistance measurements for
your individual meter at ten points—four
representing typical RTD values and six
representing typical thermistor values.
A wide variety of standards-quality
probes are available from Hart in many
different shapes, sizes, and price ranges.
Please refer to our selection of probes on
page 60. The uncertainty of your probe
should be added to the uncertainty of the
meter to compute total system
uncertainty.
Stores (in a memory chip) the characterization con
stants for your RTD or thermistor so there’s no need to
enter them manually or download them from a PC.
Tells your 1521/1522 the serial number and
recall date of the attached probe so you never
have to worry about using a probe that is
overdue for calibration.
Tells your 1521/1522 whether it’s connected
to an RTD or thermistor. No need to tell your
readout what to do.
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Allows you to change probes easily. Simply plug in the new
probe and the 1521/1522 is “married” to it with all the
relevant data.
Handheld Thermometers make excellent reference
standards for field calibrations.
1522 Little Lord Logger
The Model 1522 Little Lord Logger has all
the power and great features of the 1521
plus the ability to log data. Two data ac
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quisition modes are included.
In “Auto Logging” mode, the 1522 can
store up to 10,000 measurements at
user-selected intervals, including the
value, unit of measure, date, and time of
each measurement. If you need more
than one data set, stop recording any
time and record as many sets as you like
up to a total of 10,000 values. Once the
10,000 value limit is reached, recording
stops, so data is never lost unless you tell
the 1522 to clear its log.
Calibrate PRTs over their useful range
Most people use their platinum resistance
thermometers over a temperature range
that is smaller than the total operable
range published by the instrument’s manu
facturer. When recalibrating a PRT, select
the calibration range based on the in
tended use rather than on the manufac
turer’s maximum range specifications. This
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The 1522 also holds as many as 25
data labels in its memory so that each set
of data can be uniquely tagged. Simply
select one of the 25 labels you’ve created
before recording data. This label is then
recorded with each measurement.
In “Demand Logging” mode, up to 100
individual measurements can be recorded, each one tagged with one of the
25 data labels. Whether you need a lot of
measurements from one source or single
measurements from many sources, the
1522 is a powerful data recording tool.
With Hart’s 9934 LogWare software
(see page 87), data management is easy.
Data sets gathered remotely through the
1522 can be easily downloaded to a PC
either as a single file or as individual files
for each data set. Link the LLL to your PC
through a serial cable to send data as
ASCII or binary files. View the data, graph
it, or apply alarms. With LogWare you
can record data in real time either from a
1522 or 1521 Thermometer.
One company consistently delivers
powerful metrology products that make
your life easier. Ask other companies
about their handheld thermometers. Ask
them about their thermometers that are
accurate to within a few millikelvin and
that record data at the touch of a button.
will save you money because calibrations
over a wider span usually require more
temperature points, and therefore cost
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more. It will also reduce the wear and tear
on your probe and result in better measure
ments since PRTs are generally more stable
when used over a narrow range.
Then ask them to give it all to you in one
package. Hart Scientific does—at a price
you’ll love. Call us today and get the most
powerful handheld thermometers in the
world.
LogWare software can be used to graphically and
statistically analyze data logged to the Model 1522
LLL. LogWare can also turn either Handheld Ther
mometer into a real-time datalogger.
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www.hartscientific.com 55
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