QUESTemp 46 by TSI Quest - Area Heat Stress Monitor

Area Monitoring Datalogging
Heat Stress Manufacturer: TSI Quest
QUESTemp 46 by TSI Quest - Area Heat Stress Monitor
Training
Available
QUESTemp 46 by TSI Quest - Area Heat Stress Monitor
QUESTemp 46 by TSI Quest - Area Heat Stress Monitor
Training
How to use a TSI QUESTemp heat stress monitor
Training
Construction Industrial Hygiene: Recognizing, Evaluating, and Controlling Jobsite Health Hazards
Training
Industrial Hygiene (IH) Field Kit Essentials: A Professional Setup Guide

The TSI QUESTemp° 46 is a portable area heat stress monitor featuring waterless wet bulb technology, eliminating the need for wicks and distilled water maintenance. It measures dry bulb, globe temperature, and relative humidity, calculating WBGT (Wet Bulb Globe Temperature) indoors and outdoors along with Heat Index (U.S.) and Humidex (Canada). Stay time guidance supports ACGIH TLV®, U.S. Navy PHEL charts, U.S. Navy/Marine Corps. flag conditions, and EPRI action limits. Measurement range covers 0–120°C (±0.5°C) for dry bulb and globe, 20–95% RH (±5%), and waterless wet bulb at ±1.1°C expanded uncertainty. Runs on a 9V alkaline battery (~80 hours) with RS-232 serial output. Well-suited for industrial facilities, construction sites, and hot work environments requiring low-maintenance, reliable WBGT monitoring.

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$130.00
Weekly
$275.00
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QUESTemp 46 by TSI Quest - Area Heat Stress Monitor
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What is the QUESTemp 46 used for?
It's an area heat stress monitor that calculates WBGT (Wet Bulb Globe Temperature) using a waterless wet bulb sensor — eliminating the wick filling and maintenance required by traditional WBGT meters. It's used to set work/rest thresholds in hot industrial, construction, and outdoor environments.
What makes the waterless wet bulb sensor different?
Traditional WBGT meters use a water-soaked wick that requires regular filling, drying time, and contamination management. The QUESTemp 46's waterless sensor calculates wet bulb from RH and temperature, simplifying field deployment and reducing maintenance errors.
What measurements and guidance outputs does it provide?
It measures dry bulb, globe temperature, and RH to calculate WBGT (indoor and outdoor), Heat Index, and Humidex. Stay-time guidance is based on ACGIH TLV criteria, U.S. Navy PHEL charts, U.S. Navy/Marine flag conditions, and EPRI action limits.
QUESTemp 46 vs. QUESTemp 36 — which should I use?
Choose the QUESTemp 46 when wick maintenance is a logistical problem — remote sites, high-frequency use, or crews without consistent water access. Choose the QUESTemp 36 when a traditional natural wet bulb measurement is specifically required by your program or client.
QUESTemp 46 vs. a wearable heat stress band — which do I need?
Use the QUESTemp 46 to characterize environmental heat conditions by location and set work/rest protocols. Use a wearable to monitor individual worker physiological strain during those conditions. They answer different questions and work well together.
What's a common mistake when using WBGT measurements?
Measuring in one location and applying the result to the whole site. WBGT varies with shade, proximity to radiant heat sources, and airflow. Place the monitor where workers are actually exposed and document placement conditions.
What's included in the rental kit?
The QUESTemp 46 monitor, calibration verification module, serial cable and USB adapter, spare 9V battery, software and manuals on flash drive, tools, and carrying case.
What does it cost to rent the QUESTemp 46?
$130/day and $275/week. Pricing beyond two weeks is by quote. For seasonal heat stress programs covering multiple months, contact us for a long-term rate — the waterless wet bulb sensor reduces maintenance overhead that would otherwise add cost over extended deployments.

Exposure Hazards This Equipment Detects

Humidity (% RH)

CAS: N/A
Learn More
Updated on March 09, 2026
PEL TWA
N/A
REL TWA
N/A
TLV TWA
N/A

Temperature (°C / °F)

CAS: N/A
Learn More
Updated on March 09, 2026
PEL TWA
N/A
REL TWA
N/A
TLV TWA
N/A

Features & Capabilities

Calibration Certificate Available: ✓ Yes
Datalogging: ✓ Yes
Monitoring Scope: Area Monitoring

Equipment Specifications

Type/Class Rating: Area Heat Stress Monitor (WBGT), Waterless Wet Bulb
Measured Parameters: Dry Bulb Temperature, Globe Temperature, Relative Humidity, Waterless Wet Bulb (calculated)
Calculated Outputs: WBGT (Indoor), WBGT (Outdoor), Heat Index (U.S.), Humidex (Canada), Stay Time / Work-Rest Guidance
Measurement Range: Dry Bulb & Globe: 0 to 120°C (±0.5°C); Relative Humidity: 20–95% (±5%); Waterless Wet Bulb: ±1.1°C expanded uncertainty (0–80°C)
Connectivity: RS-232 serial, parallel printer output, compatible with TSI Detection Management Software (DMS)
Battery Run Time: 9V alkaline: approximately 80 hours
Size / Weight: 9.2 in H × 7.2 in W × 3.0 in D (23.5 × 18.3 × 7.5 cm); 2.6 lbs (1.2 kg)
Compliance Standards: ACGIH TLV, U.S. Navy PHEL Charts, U.S. Navy/Marine Corps Flag Conditions, EPRI Action Limits

Kit Contents

QUESTemp° 46 Monitor, Calibration Verification Module, Serial Data Cable, Serial-to-USB Adapter with drivers, Spare 9V Battery, User Manual and Software on flash drive, Flathead Screwdriver, and Carrying Case

Manufacturer Resources

Documents

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