At ThermoWorks we recommend calibration equipment we use in our lab like the 1620 Dewk Thermo-Hygrometer. It’s a fully loaded lab quality temperature and humidity recorder with ethernet and wireless capabilities for data convenience.
The standard-accuracy sensor (“S” model) reads temperature to ± 0.25°C over its calibrated range of 15 to 35°C. Relative humidity readings are to ±2%RH from 20 to 70%RH. All DewK sensors come with NVLAP accredited certificates of calibration for both temperature and humidity, complete with data and NIST traceability.
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 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. With an RF modem the Dewk can transmit wirelessly up to 100 ft away.
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.
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.
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!
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.
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. Call ThermoWorks today to order your Dewk for your lab.
| Specifications |
| Operating Range: |
-32 to 122 F / 0 to 50°C ;
0 to 100% RH |
| Calibrated Temperature Accuracy (“S” Model): |
±0.45°F from 59 to 95 °F / ±0.25 °C from 15 to 35°C
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| Calibrated RH Accuracy (“S” Model): |
±2%RH from 20 to 70%RH |
| Expected Extrapolated Performance (Uncertified): |
±0.9°F / ±0.5°C outside calibrated range
±3%RH outside calibrated range |
| Delta Temperature Accuracy: |
±0.045°F for ±1° changes within 59 to 95°F /
±0.025°C for ±1° changes within 15 to 35°C |
| Delta Humidity Accuracy: |
±1.0%RH for ±5% changes within 20 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 |
| Certificate: |
Includes Certificate of Conformance |
| 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): |
4.9 x 8.3 x 2.0 in / 125 x 211 x 51 mm |
| Size (Sensors) (LxDia): |
3.1 x 0.75 in / 79 x 19 mm |
| Weight: |
1.5 lb / 0.7 kg |
| 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 |
To Order:
| 1620A-S |
The DewK Thermo-Hygrometer, includes one standard-accuracy sensor, wall bracket, and RS-232 cable. |
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| 1621A-S |
The DewK Thermo-Hygrometer Kit, includes two standard-accuracy sensors, wall bracket, RS-232 cable, 25 ft sensor extension cable, sensor wall bracket, sensor case, and 9936A LogWare III software single-PC licence. |
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| 2626-S |
Spare Sensor, standard accuracy |
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| 2627-S |
Spare Sensor Kit, (includes high-accuracy sensor, sensor case, sensor wall mount bracket, and 25 ft / 7.6m extension cable) |
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| 2628 |
Cable, Sensor Extension, 25ft / 7.6m |
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| 2629 |
Cable, Sensor Extension, 50ft / 15.2m |
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| 9936A |
LogWare III Software(single license) |
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(Click image for a larger view)
Graphical & Statistical Data
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.

(Click image for a larger view)
LogWare III Software
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.
Downloads:
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