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Fluke 1623A-H-156 “DewK” Thermo-Hygrometer High-Accuracy Kit

Fluke 1623A-H-156
Catalog #: 3806985
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  • Superior accuracy
  • Network enabled
  • Powerful logging and analysis tools
  • Two interchangeable calibrated sensors
  • Huge memory
  • Upgraded software
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Sale: $4,240.00
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Fluke 1623A-H-156 High-Accuracy “DewK” Thermo-Hygrometer Kit

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Product Information

1623A-H-156 High-Accuracy “DewK” Thermo-Hygrometer Kit (50ft. Cable)

Two types of sensors are available.
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 thermo-hygrometer sensors come with NVLAP accredited certificates of calibration for both temperature and humidity, complete with data and NIST traceability.

Ethernet and wireless capability
With its built-in Ethernet RJ45 jack, multiple DewK thermo hygrometers 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.

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

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. 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.

Graphical and Statistical data

Calibrated sensors
With 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 by Fluke Calibration. 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.

Product Application

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 Calibration. Spare sensors may also be purchased as a kit, which includes a wall mounting bracket and a 25-foot extension cable.

The DewK thermo hygrometer and humidity monitor has enough on-board memory to store up to 400,000 date- and times 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.

Large, easy-to-read 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 thermo hygrometer and humidity monitor 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.

What's In The Box

  • 1620A-H Thermo-Hygrometer, High-Accuracy Kit
    • AC adapter and power cord
    • RS-232 cable
    • Manual
    • Report of calibration
    • Wall mount bracket for 1620A
    • High accuracy sensor (mounts directly to 1620A)
    • 9V battery
  • 2627-H Spare Sensor Kit (includes high accuracy sensor, sensor wall mount bracket, and 50 ft extension cable)
  • 9936A LogWare III Software, Single License


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

Fluke 1623A-H-156 Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Environmental Testers / Physical Property/Hygrometers Template

Measure TemperatureYes
Dual DisplayYes
Style (Hygrometers)Fixed
Wireless CapabilityYes
Temperature Accuracy± 0.25 °C from 15 °C to 35 °C

Test Equipment General Attributes

Unique FeaturesPassword-protected visual, audible, and external alarms
Additional Info/CommentsWall mounted (hardware included) or set on a bench top
Calibration IncludedNIST Calibration 
Power Supply Voltage120V/220V Universal
Safety ApprovalCSA
Interfaces I/O LAN / Ethernet, RF, RS-485, Wifi
Product Weight1.5 LBS
Battery TypeOther
Product Height51 MM (2.01 IN)
Product Length125 MM (4.92 IN)
Product Width211 MM (8.31 IN)
Country of OriginUnited States



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