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Fluke 1620A-H-156 DewK Thermo-Hygrometer, high accuracy

Model: 1620A-H-156

Measures temperature to 32.23°F (±0.125°C) and humidity to ±1.5% on two channels and calculates dew point, heat index, and rates of change for both temperature and humidity. On-board memory to store up to 400,000 date and time stamped data points.

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Fluke 1620A-H-156 Offers

The high-accuracy sensor's (H model) relative humidity readings are to ±1.5% RH from 20 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.


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

Ethernet and wireless capability

With its built-in ethernet RJ45 jack, multiple DewKs can be monitored from the same screen using Log Ware 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' 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. Minimum, maximum, and a variety of other statistics are also calculated and can be shown on-screen. Daily summary statistics, including minimum, maximum, 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' 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.


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 backups

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 Log Ware III. The DewK is also equipped with a 0 to 12 V 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 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 16 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.

Fluke 1620A-H-156 Specifications

Operating Range 32 to 122°F (0 to 50°C); 0 to 100% RH
Calibrated Temperature Accuracy H Model: ±32.23°F from 60.8 to 75.5°F (±0.125°C from 16 to 24°C)
Calibrated RH Accuracy H Model: ±1.5% 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)
Temperature Resolution User selectable up to 0.001°F/°C on front-panel display (0.01° recorded)
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)
Memory 400,000 typical individual date/time-stamped readings
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
Alarms Password-protected visual, audible and external alarms for temperature, temperature rate, RH, RH rate and fault conditions
Connectivity Ethernet, RS-232, RF (optional)
Mounting Wall mounted (hardware included) or set on a bench top
Power 12V DC from external 100 to 240V DC power supply
Battery Backup Standard 9V battery enables continued measuring during power disruptions
Dimensions Sensor: 3.1 x 0.75" (79 x 19 mm)
DewK: 4.9 x 8.3 x 2" (125 x 211 x 51 mm)
Weight 1.5 lbs (0.7 kg)
Click here for complete specifications on the Fluke 1620A-H-156

What's included with the Fluke 1620A-H-156

  • Thermo-Hygrometer
  • High-Accuracy Sensor
  • Wall Mount Bracket
  • RS-232 Cable

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Customer Reviews for the Fluke 1620A-H-156