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Fluke 1621A-H Precision

Thermo Hygrometer

Fluke 1621A-H Precision Thermo Hygrometer

The DewK measures temperature to ± 0.125 °C and humidity to ± 1.5 % on two channels, and displays it on a big,

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The DewK measures temperature to ± 0.125 °C and humidity to ± 1.5 % on two channels, and displays it on a big, clear screen. Ethernet, wireless (optional), or RS-232 will allow you to network as many DewKs as you’d like. And the LogWare III software will allow real-time logging of multiple DewKs, data storage to your computer and seamless integration with MET/CAL® software.

Features at a glance:

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

    The high-accuracy sensor 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.

    All DewK 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 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.

    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.

    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.

    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. 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.


    The DewK 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 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.

  • Specifications 
    Operating range0 °C to 50 °C (32 °F to 122 °F); 0 % RH to 100 % RH
    Calibrated temperature accuracy± 0.125 °C from 16 °C to 24 °C
    (± 0.225 °F from 60.8 °F to 75.2 °F)
    Calibrated RH accuracy± 1.5 % RH from 20 % RH to 70 % RH
    Expected axtrapolated 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 resolutionUser 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 resolutionUser selectable up to 0.01 % on front-panel display (0.1 % recorded)
    InputsUp to two sensors, measure temperature and relative humidity, detachable, cable-extendable, interchangeable, self-contained calibrations, may be assigned unique 16-character identifications
    Display240 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
    Memory400,000 typical individual date/time-stamped readings
    AlarmsPassword-protected visual, audible, and external alarms for temperature, temperature rate, RH, RH rate, and fault conditions
    Alarm port output2.5 mm two-conductor subminiature plug, 0 V normal, 11 to 12 V active, sources up to 20 mA
    ConnectivityEthernet, RS-232, RF (optional)
    EthernetRJ45 jack, 10 Base-T or 100 Base-TX; static or dynamic (DHCP client) IP address assignment
    Web pageEmbedded web page interface features: instrument identification, measurements, password-protected terminal page; can be disabled
    Wireless optionRequires 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
    MountingWall mounted (hardware included) or set on a bench top
    Power12 V dc from external 100 to 240 V dc power supply
    Battery backupStandard 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)
    Weight0.7 kg (1.5 lb)
    CalibrationCertificate 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

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Fluke 1621A-H Precision

Fluke 1621A-H Precision

Fluke 1621A-H Precision Thermo Hygrometer

The DewK measures temperature to ± 0.125 °C and humidity to ± 1.5 % on two channels, and displays it on a big,

Write your review