Phone: 801-763-1600
Fax: 801-763-1010
Phone (toll free): 800-438-4278
E-mail: info@hartscientific.com

Request a....

Home

What's New

Products

Support

U.S. Cal Lab

European Cal Lab

Accreditation

Training

Events

Publications

Contact Hart

International

Links

Temperature Calculators

Site Contents

Visit other Fluke companies for calibration equipment and services in electrical, power, pressure, flow, RF, and more.

Fluke

DH Instruments

The “DewK” Thermo-Hygrometer

Environmental monitoring of temperature and humidty with the 1620A DewK

Features
Specifications
Ordering Information
Downloads
Application Note

Features

Superior accuracy
NEW! Network enabled
Powerful logging and analysis tools
Two interchangeable calibrated sensors
Huge memory
NEW! Upgraded software

Specifications

Operating Range	0 °C to 50 °C (32 °F to 122 °F); 0 %RH to 100 %RH
Calibrated Temperature Accuracy (“H” Model)	± 0.125 °C from 16 °C to 24 °C (± 0.225 °F from 60.8 °F to 75.2 °F)
Calibrated temperature Accuracy (“S” Model)	± 0.25 °C from 15 °C to 35 °C (± 0.45 °F from 59 °F to 95 °F)
Calibrated RH Accuracy (“H” Model)	± 1.5 %RH from 20 %RH to 70 %RH
Calibrated RH Accuracy (“S” Model)	± 2 %RH from 20 %RH to 70 %RH
Expected Extrapolated Performance (Uncertified)	± 0.5 °C (± 0.9 °F) outside calibrated range ± 3 %RH outside calibrated range
Delta Temperature Accuracy	± 0.025 °C for ± 1 ° changes within 15 °C to 35 °C (± 0.045 °F for ± 1 ° changes within 59 °F to 95 °F)
Temperature Resolution	User selectable up to 0.001 °C/°F on front-panel display (0.01° recorded)
Delta Humidity Accuracy	± 1.0 %RH for ± 5 % changes within 20 %RH to 70 %RH
RH Resolution	User selectable up to 0.01 % on front-panel display (0.1 % recorded)
Inputs	Up to two sensors, measure temperature and relative humidity, detachable, cable-extendable, interchangeable, self-contained calibrations, may be assigned unique 16-character identifications
Display	240 x 128 graphics monochrome LCD, displays password-protected temperature/humidity data graphically, numerically, and statistically (one or both channels); 16 pre-defined, user-changeable screen setups
Memory	400,000 typical individual date/time-stamped readings
Alarms	Password-protected visual, audible, and external alarms for temperature, temperature rate, RH, RH rate, and fault conditions
Alarm Port Output	2.5 mm two-conductor subminiature plug, 0 V normal, 11 to 12 V active, sources up to 20 mA
Connectivity	Ethernet, RS-232, RF (optional)
Ethernet	RJ45 jack, 10 Base-T or 100 Base-TX; static or dynamic (DHCP client) IP address assignment
Web Page	Embedded web page interface features: instrument identification, measurements, password-protected terminal page; can be disabled
Wireless Option	Requires wireless modem. 802.15.4 (underlies Zigbee), 2.4 GHz frequency, 1 mW transmit power, 30 m (100 ft) typical unobstructed range; can be disabled
Mounting	Wall mounted (hardware included) or set on a bench top
Power	12 V dc from external 100 to 240 V dc power supply
Battery Backup	Standard 9 V battery enables continued measuring during power disruptions
Size (DewK) (HxWxD)	125 mm x 211 mm x 51 mm (4.9 x 8.3 x 2.0 in)
Size (Sensors) (LxDia)	79 mm x 19 mm (3.1 x 0.75 in)
Weight	0.7 kg (1.5 lb)
Calibration	Certificate of NIST-traceable NVLAP accredited temperature and humidity calibration included; As Found and As Left data supplied at three temperature points and three humidity points each at 20 °C (68 °F); Complies with NCSL/ISO/IEC 17025:2000 and ANSI/NCSL Z540-1-1994
LogWare III (Optional Software)	Requirements include: Microsoft® Windows® 2000 (SP4) or XP (SP2) operating system, IBM compatible Intel Pentium® IV 1 GHz PC processor or better, 512 Mb RAM (1Gb or more recommended), 200 Mb HDD space for installation (additional free space recommended for data storage), CD-ROM drive for installation

Two years ago the 1620 DewK revolutionized environmental monitoring for calibration labs, but it just got better. Wait until you hear about the 1620A!

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 Hart, 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. Hart provides exceptional uncertainties, 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 on-screen. Daily summary statistics, including min, max, and maximum rates of change are stored for the most recent sixty days.

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 at Fluke’s Hart Scientific Division. 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 Hart. 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.

1620A displays showing a few of the many customizations available.

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.

Confidence

Fluke’s Hart Scientific Division 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.

Add DHI's RPM4 barometer for a complete pressure, humidity, and temperature lab monitoring solution. Don’t compromise on your lab standards. Measure with confidence. Partner with Hart Scientific.

Use DHI's RPM4 barometer with the Hart Scientific 1620A “DewK” Thermo-Hygrometer for a complete lab environmental monitor for pressure, temperature and humidity: www.dhinstruments.com

LogWare III

If you really want to get the most out of your DewK, LogWare III is an investment worth every penny. As client-server or stand-alone software, it remotely monitors and logs an unlimited number of concurrent log sessions into a single database. That means data from many DewKs can be managed in real time via Ethernet, RS-232, or wireless connections.

LogWare III allows you to customize your graph trace color, alarms, and statistics as you go. You can start/stop log sessions and modify sample intervals from your computer. LogWare III supports “hot-swapping,” which allows you to remove and replace sensors without shutting down the log session. LogWare III also supports security features such as passwords for individual users or groups/teams, a built-in administrator account, pre-defined user groups, and customizable permissions.

Never again be the last to know about a problem. Customizable e-mail settings allow you to send e-mails to designated recipients, including cell phones and PDA’s, when a log session begins, ends, or is aborted; when the DewK’s battery is low; when a sensor calibration is due; or when a temperature/humidity alarm is exceeded.

If you cannot be reached via email, you can always arrange to be paged instead. Data stored on the DewK can be imported into the software, which is a handy feature when power outages disable the network.

Are you ready for a deep dive into your data? Historical data can be viewed by sensor (model/serial number) location, or log session and displayed in a spreadsheet-style grid. Logged data can also be exported to HTML, RTF or ASCII text for use in your analytical software, or simply print historical data and graphs.

Customizable graphs in LogWare III with zooming capability are an easy way to analyze your data history, and data points that need to be explained can be highlighted, annotated, and referred to later. LogWare III statistics include min, max, spread, average, and standard deviation functions, and printed reports keep track of the number of temperature and humidity measurements that were found to be out of tolerance.

Ordering Information
Models
1621A-H	The “DewK” Thermo-Hygrometer, High-Accuracy Value Kit (includes two high-accuracy sensors, wall mount bracket, RS-232 cable, 7.6 m [25 ft] sensor extension cable, sensor wall mount bracket, sensor case, and 9936A LogWare III single-PC license)
1622A-H	The “DewK” Thermo-Hygrometer, USB Wireless High-Accuracy Value Kit (includes 1621A-H Value Kit, 2633-RF, and 2633-USB)
1620A-H	The “DewK” Thermo-Hygrometer, High-Accuracy (includes one high-accuracy sensor, wall mount bracket, and RS-232 cable)
1621A-S	The “DewK” Thermo-Hygrometer, Standard-Accuracy Value Kit (includes two standard-accuracy sensors, wall mount bracket, RS-232 cable, 7.6 m [25 ft] sensor extension cable, sensor wall mount bracket, sensor case, and 9936A LogWare III single-PC license)
1622A-S	The “DewK” Thermo-Hygrometer, USB Wireless Standard-Accuracy Value Kit (includes 1621A-S Value Kit, 2633-RF, and 2633-USB)
1620A-S	The “DewK” Thermo-Hygrometer, Standard-Accuracy (includes one standard-accuracy sensor, wall mount bracket, and RS-232 cable)
Sensors
2626-H	Spare Sensor, high-accuracy
2627-H	Spare Sensor Kit (includes high-accuracy sensor, sensor case, sensor wall mount bracket, and 7.6 m [25 ft] extension cable)
2626-S	Spare Sensor, standard-accuracy
2627-S	Spare Sensor Kit, (includes standard-accuracy sensor, sensor case, sensor wall mount bracket, and 7.6 m [25 ft] extension cable)
Accessories
2633-RF	Wireless Option (requires wireless modem)
2633-USB	Wireless Modem, USB to wireless
2633-232	Wireless Modem, RS-232 to wireless
2628	Cable, Sensor Extension, 7.6 m (25 ft)
2629	Cable, Sensor Extension, 15.2 m (50 ft)
9328	Protective Case for 1620A and two sensors
2607	Protective Case for spare sensor
2361	Spare Power Supply, 100 to 240 V ac
9320A	External Battery Pack (powers 115 V ac or 12 V dc products only)
Software
9936A	LogWare III Software (Single License)
9936A-L1^†	Additional 1-Pack License, LogWare III Software
9936A-L5^†	Additional 5-Pack License, LogWare III Software
9936A-L10^†	Additional 10-Pack License, LogWare III Software
9936A-LST^†	Additional Site License, LogWare III Software
9936A-UPG	9936A Software Upgrade from version 1.x
^†All additional licenses require the purchase and installation of 9936A single license.

Downloads

Right click one of the following links and “Save Target As ...” to download a complete data sheet or a product User's Guide in Acrobat (.pdf) format.

(back to top)

Use our feedback form for more information.

Click to request a quote, catalog, or a consultation. Or call us at 1-800-438-4278.

Home | What's New | Products | Support | U.S. Cal Lab | European Cal Lab | Accreditation |Training | Events | Publications |Contact Hart | International | Links | Temperature Calculators | Software | Contents