QUESTemp QT-48N Heat Stress Monitor

Overview

The TSI Inc QUESTempº 48N offers traditional heat stress monitoring without the aggravation of maintaining a wet bulb. Through collaboration with Professor Dr. Thomas Bernard, from the College of Public Health at the University of South Florida, mathematical models were implemented to create a Waterless Wet Bulb calculation through a combination of dry bulb temperature, globe temperature, relative humidity, and air flow.

The QUESTempº 48N model was specifically engineered for the Department of Defense Ashore and Afloat Operations in which conditions require hand’s free monitoring, in-the-field user RH/WBGT sensor alignments, and snapshot measurement logging (called “event logging mode”).

The QT48N measures and calculates the dry bulb, wet bulb, globe, WBGT outdoors, and relative humidity with two different types of data logging modes – as a time history session or an event logging mode. You also have the capability to measure stay times in order to manage work/rest regimens. Guidance is based on the screening criteria for heat stress as defined in the ACGIH TLV Handbook, U.S. Navy PHEL charts, and Flag Conditions for U.S. Navy/Marine Corp. Ashore.

For more information on the QUESTemp QT-48N Portable Heat Stress Monitor, contact your local Air-Met office.

Features

Waterless wet bulb system
Ideal for athletic training facilities, military training, warehousing, occupational heat stress management, and risk analysis investigations
Measure and calculate dry bulb, wet bulb, and globe temperature, WBGT indoor/outdoor, relative humidity and heat index/humidex
Real-time clock provides accurate reporting with time stamping
Stay time measurement per ACGIH TLV Handbook, US Navy PHEL charts, US Marine Flag system, and EPRI action limits (QT46 only)
Compatible with TSI software for data storage, retrieval, analysis, reporting and charting

Specifications

	Natural Wet Bulb Models			Waterless Wet Bulb Models
Measurement Parameters:	QT°32	QT°34	QT°36	QT°44	QT°46	QT°48N
Dry Bulb, Wet Bulb and Globe Temperatures, Relative Humidity	•	•	•	•	•	•
Air Velocity			option		option
WBGT (indoor) Index	•	•	•	•	•
WBGT (outdoor) Index	•	•	•	•	•	•
Heat Index/ HUMIDEX	•	•	•	•	•
Temperature Reading: Celsius or Fahrenheit	•	•	•	•	•	•
Data Logging Intervals: 1, 2, 5, 10, 15, 30 or 60 minutes		•	•	•	•	•
Event Logging Mode						•
Display Languages: Choose from Chinese, Czech, English, French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, and Turkish	•	•	•	•	•	•
Time & Date Stamping with Clock and Calendar		•	•	•	•	•
Displayed Stay Times: ACGIH TLV, U.S. Navy PHEL charts, U.S. Navy/Marine Corp. Ashore Flag Conditions, EPRI Action Limits (QT°48N excludes EPRI)			•		•	•
Head-Torso-Ankle Weighted Average WBGT (optional with tri-sensors)	option	option	option	option	option

Sensors:
Dry Bulb Sensor - 1000 Ohm platinum RTD Accuracy and Ranges: +/-0.5 from 0° C to 120° C (+/-0.9° F from 32° F to 248° F)	•	•	•	•	•	•
Wet Bulb Sensor - 1000 Ohm platinum RTD Accuracy and Ranges: +/-0.5 from 0° C to 120° C (+/-0.9° F from 32° F to 248° F)	•	•	•
Waterless Wet Bulb (Humidity) sensor Accuracy and Ranges: +/-1.1° C (k=2) between 0° C and 80° C (32° F and 176° F)				•	•	•
Globe Sensor - 1000 Ohm platinum RTD Accuracy and Ranges: +/-0.5 from 0° C to 120° C (+/-0.9° F from 32° F to 248° F)	•	•	•	•	•	•
Relative Humidity Sensor Accuracy and Ranges: +/-5% from 20 to 95% (non-condensing)	•	•	•	•	•	•
Air Velocity Probe - Omni-directional heated thermistor Accuracy and Ranges: +/-(0.1 m/s + 4%) from 0 to 20 m/s			option		option

Operating Temperature Range:
Sensor Assembly: -5° C to 100° C (23° F to 212° F)	•	•	•	•	•	•
Electronics: -5° C to 60° C (23° F to 140° F)	•	•	•	•	•	•

Data Management:
Detection Management Software DMS* *Software is required to be purchased separately	•	•	•	•	•	•
Thermal Comfort Indices in Accordance with ISO 7730 Predicted Mean Vote (PMV) and Predicted Percent Dissatisfied (PPD)			option		option

Output: RS-232 Serial Printer / Computer Interface; Parallel Printer Interface		•	•	•	•	•

Power Source:
9V Disposable Batteries; Hours of Battery Life	140			80
NiMH Rechargeable Battery; Hours of Battery Life	300			160

Mechanical:
D-ring with Lanyard Attachment. Allows for Hands-Free Monitoring						•
Tripod Mount / Remote Sensor Bar.	•	•	•	•	•	•
Allows for up to 61 m (~200 ft) Long Distance Measurement	•	•	•	•	•	•
IP54 Water & Dust Ingress Protection Rating	•	•	•	•	•	•
Case Size (including mounted sensor assembly) 23.4 x 18.3 x 7.6 cm (9.2" x 7.2" x 3")	•	•	•	•	•	•
Weight: 1.2 kg (2.6 lb) with Mounted Sensor Assembly	•	•	•	•	•	•

Standards and Approvals: Intrinsic Safety, UL/CSA standards for Class I groups A, B, C & D, Class II groups E, F & G, Class III temperature code T3 & ATEX	•	•	•

Electromagnetic Conformance: CE Mark	•	•	•	•	•	•