--- title: "TSI QUESTemp Heat Stress & Comfort | Aethair" description: "TSI QUESTemp area heat-stress (WBGT) monitors in the Aethair sensor catalog: 7 natural and waterless wet-bulb models, connected through Thiamis." url: https://aethair.io/sensors/tsi-heat-stress-comfort/ --- Sensors · Heat Stress & Comfort # TSI QUESTemp Heat Stress & Comfort TSI Quest QUESTemp° area heat-stress (WBGT) monitors. Models 32/34/36 pair a natural (water) wet-bulb with dry-bulb, globe, and relative-humidity sensors; 44/46/48N drop the wick for a waterless wet-bulb (RH sensor + proprietary algorithm). All compute indoor/outdoor WBGT and a heat index / HUMIDEX, log over RS-232 to Detection Management Software, and accept an optional Head-Torso-Ankle tri-sensor array for height-weighted WBGT. [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Build a Configuration](https://aethair.io/build/?params=temperature,humidity,heat_index,wet_bulb,wbgt) At a glance **5** parameters **7** models [**Connects via Thiamis** RS-232 · ASCII](https://aethair.io/products/thiamis/) 1 standard limits what it measures - [ACGIH WBGT ACGIH Heat-Stress TLV (WBGT)](https://aethair.io/standards/acgih_wbgt/) Measures ## What the TSI QUESTemp Measures 5 parameters, each linked to its page: the sensors, units, and standards behind it. [Air Temperature °C S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity % S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index °C S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature °C S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) °C S1, S2, S3](https://aethair.io/parameters/wbgt/) [Connects via **Thiamis**](https://aethair.io/products/thiamis/) Wired interface [RS-232 ASCII](https://aethair.io/products/thiamis/#port-rs232) Models ## TSI QUESTemp Models 7 models, each with what it measures and the ranges its datasheet gives. | Model | Description | Measures & specs | | - | - | - | | **QuestTemp-32** | Entry-level natural (water) wet-bulb area WBGT monitor without data logging, a replacement for the WIBGET WB-300. Dry-bulb, natural wet-bulb, globe, and relative-humidity sensors; computes indoor and outdoor WBGT plus a heat index / HUMIDEX. | [Air Temperature S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) S1, S2, S3](https://aethair.io/parameters/wbgt/) | | **QuestTemp-34** | Natural (water) wet-bulb area WBGT monitor with data logging. Dry-bulb, natural wet-bulb, globe, and relative-humidity sensors; computes indoor and outdoor WBGT plus a heat index / HUMIDEX. | [Air Temperature S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) S1, S2, S3](https://aethair.io/parameters/wbgt/) | | **QuestTemp-36** | Logging natural wet-bulb monitor that adds selectable stay-time work/rest limits: ACGIH Heat-Stress TLV, U.S. Navy PHEL, Navy/Marine Ashore Flag, and EPRI action limits. | [Air Temperature S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) S1, S2, S3](https://aethair.io/parameters/wbgt/) | | **QuestTemp-38** | Discontinued natural wet-bulb logging model, no longer in the current TSI catalog; retained for units still in the field. | [Air Temperature S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) S1, S2, S3](https://aethair.io/parameters/wbgt/) | | **QuestTemp-44** | Entry waterless wet-bulb monitor: an RH sensor and proprietary algorithm replace the wick, so there is no daily maintenance. Reports outdoor WBGT only (no indoor WBGT, heat index, stay times, or tri-sensor option), with data logging. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Wet Bulb Temperature](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress)](https://aethair.io/parameters/wbgt/) | | **QuestTemp-46** | Waterless wet-bulb monitor with indoor and outdoor WBGT, heat index / HUMIDEX, and selectable stay-time limits (including EPRI action limits); accepts the tri-sensor array. | [Air Temperature S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) S1, S2, S3](https://aethair.io/parameters/wbgt/) | | **QuestTemp-48N** | Top waterless wet-bulb monitor: adds an event-logging mode and a D-ring hands-free lanyard mount. Stay-time set covers ACGIH Heat-Stress TLV, U.S. Navy PHEL, and Ashore Flag conditions (EPRI action limits excluded). | [Air Temperature S1, S2, S3](https://aethair.io/parameters/temperature/) [Relative Humidity S1, S2, S3](https://aethair.io/parameters/humidity/) [Heat Index S1, S2, S3](https://aethair.io/parameters/heat_index/) [Wet Bulb Temperature S1, S2, S3](https://aethair.io/parameters/wet_bulb/) [WBGT (Heat Stress) S1, S2, S3](https://aethair.io/parameters/wbgt/) | Standards ## Standards for What It Measures Standards that set limits on the parameters it reports, plus any method standard the instrument is built to. [ACGIH WBGT ACGIH Heat-Stress TLV (WBGT) 1 of its parameters](https://aethair.io/standards/acgih_wbgt/) Built to [ISO 7243: heat stress assessment with the WBGT index](https://aethair.io/standards/iso_7243/) Solutions ## Where the TSI QUESTemp Is Used Solutions whose recommended configuration uses this instrument or whose standards it is built to, followed by solutions whose core panel it partly measures. ### [Weather Stations & Meteorology](https://aethair.io/solutions/weather/) Professional multi-parameter weather monitoring ### [Heat Stress & Outdoor Work](https://aethair.io/solutions/heat-stress/) WBGT for worksites, athletics, and events On the platform ## What the TSI QUESTemp 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 ### [Fluke Calibration](https://aethair.io/sensors/fluke-calibration-heat-stress-comfort/) [Heat Stress & Comfort](https://aethair.io/sensors/fluke-calibration-heat-stress-comfort/) [The Fluke Calibration 1620A 'DewK' is a two-sensor, reference-grade thermo-hygrometer for…](https://aethair.io/sensors/fluke-calibration-heat-stress-comfort/) Questions ## TSI QUESTemp FAQ What is the difference between the natural wet-bulb (32/34/36) and waterless (44/46/48N) QUESTemp models? The 32/34/36 use a traditional wet-bulb sensor (a wick kept wet with distilled water) to read the natural wet-bulb temperature directly. The 44/46/48N drop the wick: a relative-humidity sensor feeds a proprietary algorithm that derives the wet-bulb value, so there is no daily water top-up or wick maintenance. Both routes yield the same WBGT index. Which parameters does the QUESTemp measure? Every unit carries dry-bulb, globe, and relative-humidity sensors (plus a natural wet-bulb sensor on the 34/36). From these it computes the Wet Bulb Globe Temperature (an indoor WBGTi and an outdoor WBGTo index) and a heat index / HUMIDEX. The QUESTemp does not measure air velocity. What is the Head-Torso-Ankle weighted WBGT option? ISO 7243 weights WBGT measured at three heights for a standing worker: ankle, abdomen (torso), and head. With the optional tri-sensor array the QUESTemp reads three sensor bars at once (the S1/S2/S3 channels) and reports the height-weighted average WBGT. A remote sensor bar can sit up to \~61 m (200 ft) from the unit on a cable. How does the Thiamis integration read a QUESTemp? Over the RS-232 serial port at 9600 baud (8-N-1) using the QUESTemp command protocol (checksummed QA/QF/QB/QC queries). The driver identifies the model from the QA response, then polls each enabled sensor bar for its dry-bulb, wet-bulb, globe, humidity, WBGT, and heat-index values. Why does the QUESTemp° 44 report fewer values than the 46/48N? The 44 is the entry waterless model. It reports the outdoor WBGT index only (no indoor WBGT, heat index, or stay-time work/rest limits) and does not accept the tri-sensor array. The 46 adds indoor WBGT, heat index, and stay times; the 48N adds an event-logging mode and a hands-free D-ring mount. Sources: [tsi.com](https://tsi.com/products/heat-stress-monitors/) · [tsi.com](https://tsi.com/products/heat-stress-monitors/questemp%C2%BA-32-34-36-area-heat-stress-monitors) · [tsi.com](https://tsi.com/products/heat-stress-monitors/questemp-44-46-48n-area-waterless-wet-bulb-heat-stress-monitors)