--- title: "Fluke Calibration 1620A DewK Heat Stress & Comfort | Aethair" description: "Fluke Calibration 1620A 'DewK' reference thermo-hygrometer in the Aethair sensor catalog: 2 lab-grade temperature and RH models, connected through Thiamis." url: https://aethair.io/sensors/fluke-calibration-heat-stress-comfort/ --- Sensors · Heat Stress & Comfort # Fluke Calibration 1620A DewK Heat Stress & Comfort The Fluke Calibration 1620A 'DewK' is a two-sensor, reference-grade thermo-hygrometer for calibration laboratories. It is offered in high-accuracy (±0.125 °C / ±1.5 %RH) and standard-accuracy (±0.25 °C / ±2 %RH) sensor grades, both with NIST-traceable, NVLAP-accredited calibration. [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Build a Configuration](https://aethair.io/build/?params=temperature,humidity) At a glance **2** parameters **2** models [**Connects via Thiamis** RS-232 · ASCII](https://aethair.io/products/thiamis/) 4 standards limit what it measures - [ASHRAE 170 ANSI/ASHRAE/ASHE Standard 170: ventilation of health care facilities](https://aethair.io/resources/ashrae-170-requirements/) - [ASHRAE TC 9.9 ASHRAE TC 9.9: data center contamination and environmental guidelines](https://aethair.io/standards/ashrae_tc99/) - [USP 797 USP General Chapter <797>: pharmaceutical compounding, sterile preparations](https://aethair.io/standards/usp_797/) - [USP 800 USP General Chapter <800>: hazardous drugs, handling in healthcare settings](https://aethair.io/standards/usp_800/) Measures ## What the Fluke Calibration 1620A DewK Measures 2 parameters, each linked to its page: the sensors, units, and standards behind it. [Air Temperature °C](https://aethair.io/parameters/temperature/) [Relative Humidity %](https://aethair.io/parameters/humidity/) [Connects via **Thiamis**](https://aethair.io/products/thiamis/) Wired interface [RS-232 ASCII](https://aethair.io/products/thiamis/#port-rs232) Models ## Fluke Calibration 1620A DewK Models 2 models, each with what it measures and the ranges its datasheet gives. | Model | Description | Measures & specs | | - | - | - | | **1620A-H** | High-accuracy 'DewK' configuration: temperature to ±0.125 °C over a 16–24 °C calibrated range and relative humidity to ±1.5 %RH over 20–70 %RH, with a NIST-traceable, NVLAP-accredited certificate of calibration. Two interchangeable sensor inputs, RS-232 / Ethernet / optional 2.4 GHz wireless, and 400,000-point logging. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) | | **1620A-S** | Standard-accuracy 'DewK' configuration: temperature to ±0.25 °C over a wider 15–35 °C calibrated range and relative humidity to ±2 %RH over 20–70 %RH, NIST-traceable and NVLAP-accredited. Same two-sensor controller and RS-232 / Ethernet / optional wireless connectivity as the 1620A-H. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) | Standards ## Standards for What It Measures Standards that set limits on the parameters it reports. [ASHRAE 170 ANSI/ASHRAE/ASHE Standard 170: ventilation of health care facilities 2 of its parameters](https://aethair.io/resources/ashrae-170-requirements/) [ASHRAE TC 9.9 ASHRAE TC 9.9: data center contamination and environmental guidelines 1 of its parameters](https://aethair.io/standards/ashrae_tc99/) [USP 797 USP General Chapter <797>: pharmaceutical compounding, sterile preparations 1 of its parameters](https://aethair.io/standards/usp_797/) [USP 800 USP General Chapter <800>: hazardous drugs, handling in healthcare settings 1 of its parameters](https://aethair.io/standards/usp_800/) On the platform ## What the Fluke Calibration 1620A DewK Gets From Aethair Connected through Thiamis, its readings arrive in the same Environet account as Aethair's own monitors. ### [Live data and alerts](https://aethair.io/platform/environet/) [Environet](https://aethair.io/platform/environet/) shows the instrument live and alerts the people you choose by email, SMS, and webhook, at the thresholds you set. [Noesis](https://aethair.io/platform/noesis/) sets up a dashboard, a report, or an alert from a plain-text request. ### [Compliance reports](https://aethair.io/platform/reports/) [Aethair Reports](https://aethair.io/platform/reports/) produces scheduled or on-demand reports from the instrument's readings, as a PDF or secure link. Templates cover Aethair Blue, WELL v2, cabin air (ISO 23875), and the CMS-2567 healthcare codebook (ASHRAE 170), or you can report against custom limits such as OSHA PELs, NAAQS, EPA guidance, or your own program limits. ### [Dashboards and the app](https://aethair.io/platform/dashboards/) Environet dashboards and the [Aethair App](https://aethair.io/platform/app/) show the instrument's readings just like any Aethair device. The occupant-facing [Aethair Dashboards](https://aethair.io/platform/dashboards/) status display is built around Aethair IAQ and Aethair PRO. Similar ## Other Heat Stress & Comfort ### [TSI](https://aethair.io/sensors/tsi-heat-stress-comfort/) [Heat Stress & Comfort](https://aethair.io/sensors/tsi-heat-stress-comfort/) [TSI Quest QUESTemp° area heat-stress (WBGT) monitors. Models 32/34/36 pair a natural (water)…](https://aethair.io/sensors/tsi-heat-stress-comfort/) Questions ## Fluke Calibration 1620A DewK FAQ What does the 1620A DewK measure, and are dew point and heat index recorded? Each DewK sensor measures air temperature and relative humidity. From those, the instrument also computes dew point, heat index, and rates of change for its on-screen statistics, but the integration records only the measured temperature and relative humidity. The derived quantities are display functions rather than separately logged channels. What is the difference between the 1620A-H and 1620A-S models? They are the same controller fitted with different accuracy-grade sensors. The high-accuracy 'H' sensor reads temperature to ±0.125 °C over a 16–24 °C calibrated range and RH to ±1.5 %RH (20–70 %RH); the standard 'S' sensor reads temperature to ±0.25 °C over a wider 15–35 °C calibrated range and RH to ±2 %RH. Both operate over 0–50 °C / 0–100 %RH, with reduced (uncertified) accuracy of about ±0.5 °C / ±3 %RH outside the calibrated band. How does the integration communicate with the DewK? The Thiamis driver talks to the DewK over its RS-232 serial port using SCPI-style commands: '\*IDN?' to read the model and serial number (the instrument identifies itself with its Hart Scientific 'HART,\,\' string) and 'FETC?' to fetch readings. It records one temperature and one relative-humidity value per poll; the DewK's second sensor input, its Ethernet jack, and the optional 2.4 GHz wireless modem are device features this integration does not use. Why is the DewK used as a reference standard rather than a general room sensor? Every DewK sensor ships with a NIST-traceable, NVLAP-accredited certificate of calibration for temperature and humidity (As Found and As Left data at three temperature and three humidity points), and the instrument is Fluke MET/CAL compatible, so calibration laboratories use it to document and monitor environmental conditions to a defined, traceable uncertainty. Sources: [www.fluke.com](https://www.fluke.com/en-us/product/calibration-tools/temperature-calibrators/fluke-calibration-1620a)