Fluke 1620A Specifications

1620A “DewK”

Thermo-Hygrometer

• Superioraccuracy

• Networkenabled

• Powerfulloggingandanalysistools

• Twointerchangeablecalibratedsensors

• Hugememory

• Upgradedsoftware

The Fluke MET/CAL compatible
1620A DewK Thermo-Hygrometer
revolutionizes environmental mon­itoring for calibration laboratories.

Now you can easily monitor
and record conditions through­out your entire facility with the
DewK’s new Ethernet and wire­less connections, and set your
upgraded LogWare III software to
notify you immediately of chang­ing conditions.

You’ll still have the superior
convenience, dependability, and
NIST-traceable accuracy of a 1620,
but your 1620A will give you the
added accessibility and peace of
mind you’ve been looking for.

Accuracy

Two types of sensors are avail­able from Fluke Calibration, and
the DewK may be originally
purchased with either one. The
high-accuracy sensor (“H” model)
reads temperature to ± 0.125 °C
over a calibrated range of 16 °C to
24 °C. Relative humidity readings
are to ± 1.5 %RH from 20 %RH to
70 %RH.

The standard-accuracy sensor
(“S” model) reads temperature to
± 0.25 °C over its calibrated range
of 15 °C to 35 °C. Relative humid­ity readings are to ± 2 %RH from
20 % RH to 70 %RH.

All DewK sensors come with
NVLAP accredited certificates of
calibration for both temperature
and humidity, complete with data
and NIST traceability. Fluke pro­vides exceptional uncertainties,

Technical Data

including total test uncertainty
ratios better than 3:1 for both
temperature and relative humid­ity—even for the high-accuracy
sensors!

Both sensors can also measure
temperature below their respec­tive calibrated ranges to 0 °C and
above their respective calibrated
ranges to 50 °C with typical accu­racy of ± 0.5 °C. And RH readings
from 0 %RH to 20 %RH and from
70 %RH to 100 %RH are typically
within ± 3 %.

Ethernet and wireless
capability

The DewK gives you all the com­munications options you expect,
and then some. With its built-in
Ethernet RJ45 jack, multiple DewKs
can be monitored from the same
screen using our new LogWare
III client-server software. Ether­net also gives you the possibility
for remote connectivity over the
internet, so you can monitor critical
conditions while you’re away.

Cables running along the floor
can be a safety hazard, and cables
hanging from the ceiling and
walls are an eyesore. With the
DewK, your wireless dreams will
come true when you connect your
computer through an RF modem
up to 100 ft away, without the
clutter of all the extra cables!

Finally, if you need a printout,
send data to a printer through the
RS-232 interface in real time.

Math and statistical functions

In addition to temperature and
humidity, the DewK calculates
dew point, heat index, and rates of
change for both temperature and
humidity, without the need to buy
additional software. Min, max, and
a variety of other statistics are also
calculated and can be shown on­screen. Daily summary statistics,
including min, max, and maximum
rates of change are stored for the
most recent sixty days.

The DewK lets you view data just about any way you like it. Both graphical data and statistical data can be shown for temperature and humidity from
one or two inputs. Modifying any of the standard screens is easily done, so you see exactly what you want—no more, no less.

Calibrated sensors

With the DewK you get two for
the price of one. Having inputs for
two sensors, each measuring both
temperature and relative humid­ity, one DewK can monitor two
locations at the same time. Both
sensors can be run via extension
cables to remote locations up to
100 feet away, or one sensor can
be directly mounted to the top of
the DewK.

Each sensor is calibrated for
both temperature and humid­ity. The calibration constants
assigned to the sensors reside in
a memory chip located inside the
sensor housing, so sensors may
be used interchangeably between
different DewKs, and the recali­bration of sensors doesn’t require
an accompanying DewK.

Sensors may also be assigned
a unique identifier (up to 16
characters) to facilitate record
keeping by matching the sensor
identifier with the collected data.
Each DewK ships with one sensor,
with additional sensors available
from Fluke. Spare sensors may

also be purchased as a kit, which
includes a case for the sensor,
a wall mounting bracket, and a
25-foot extension cable.

Memory

The DewK has enough on-board
memory to store up to 400,000
date-and time-stamped data
points. That’s two years’ worth of
data for both measurements from
two sensors if readings are taken
every ten minutes!

Alarms and battery backup

Alarm settings can be set up
quickly in the DewK based on
temperature, the rate of change
in temperature, RH, the rate of
change in RH, and instrument
fault conditions. Alarms can be
both visual (flashing display)
and audible (beeping). Likewise,
alarm settings can be set up and
events triggered in LogWare III.
The DewK is also equipped with a
0 to 12 volt alarm output that can
trigger a process control system.

A backup battery shuts down
the DewK’s display but maintains
measurements for up to 16 hours
in the event of a power failure.

One very cool display

Want to view data from across
the room? Want to view data from
two temperature and two humid­ity inputs simultaneously? Want
to view data graphically, statisti­cally, or both? At the same time?!
The DewK does everything you
could want—or at least everything
we could think of. Up to sixteen
different display setups can be
stored and recalled at the touch of
a single button. And all 16 can be
easily modified, so you get exactly
what you want.

Confidence

Fluke Calibration supplies the
world’s finest measurement
laboratories with world-class
temperature standards. We not
only measure temperature and
humidity better than anybody, we
make temperature measurements
functional and productive.

Don’t compromise on your
lab standards. Measure with
confidence. Partner with Fluke
Calibration.

2 Fluke Calibration 1620A “DewK” Thermo-Hygrometer