TSI QUESTemp 44 / 46 / 48N – Heat Stress Monitor

TSI QUESTemp 44 / 46 / 48 – Heat Stress Monitors
The TSI QUESTemp 44, 46, and 48N Heat Stress Monitors provide accurate and reliable heat stress assessment for industrial, military, and outdoor applications. These monitors use innovative waterless wet bulb technology, eliminating the need for daily maintenance while delivering precise WBGT (Wet Bulb Globe Temperature) calculations. Designed for harsh working environments, they are IP54-rated for dust and water ingress protection, ensuring durability and performance in demanding conditions.
These models measure dry bulk, globe, and wet bulk temperatures and calculate indoor (WBGTi) and outdoor (WBGTo) indices. The QUESTemp 46 and 48N also feature additional heat stress indices and enhanced data logging functions, offering a comprehensive workplace heat stress management solution.
Who Should Use the TSI QUESTemp 44 / 46 / 48?

Industrial & Manufacturing – Monitor heat stress in factories, foundries, and production plants.
Military & Emergency Response – Ensure safe working conditions for personnel in extreme temperatures.
Construction & Outdoor Work Sites – Protect workers from heat exhaustion and dehydration risks.
Energy & Utilities Sector – Ensure workplace safety in power plants, refineries, and heavy industry.
Sports & Athletics – Monitor heat exposure in training, competitions, and endurance events.

Feature
44
46
48N

Dry Bulb, Wet Bulb & Globe Temperatures
✓
✓
✓

WBGT (Indoor) Index
✓
✓
✗

WBGT (Outdoor) Index
✓
✓
✓

Heat Index / Humidex
✓
✓
✗

Temperature Display (°C/°F)
✓
✓
✓

Data Logging Intervals (1-60 mins)
✓
✓
✓

Event Logging Mode
✗
✗
✓

Time & Date Stamping
✓
✓
✓

Pre-set Safety Limits (ACGIH TLV, US Navy, etc.)
✗
✓
✓

Tri-Sensor Compatible (Head-Torso-Ankle WBGT)
Optional
Optional
✗

Key Features

Waterless Wet Bulb Sensor: This sensor eliminates the need for daily maintenance and provides accurate Wet Bulb temperature calculations without water.
Comprehensive Heat Stress Assessment: Measures Dry Bulb and Globe Temperatures and calculates WBGTi and WBGTo indices for thorough heat stress evaluation.
Durable Design: IP54-rated for dust and water ingress protection, ensuring reliability in demanding work environments.
Flexible Power Options: It operates on a 9V disposable battery, an optional NiMH rechargeable battery, or mains power for continuous monitoring.
User-Friendly Interface: Features a clear display and intuitive controls for easy operation in the field.

Feature
44
46
48N
Dry Bulb, Wet Bulb & Globe Temperatures
✓
✓
✓
WBGT (Indoor) Index
✓
✓
✗
WBGT (Outdoor) Index
✓
✓
✓
Heat Index / Humidex
✓
✓
✗
Temperature Display (°C/°F)
✓
✓
✓
Data Logging Intervals (1-60 mins)
✓
✓
✓
Event Logging Mode
✗
✗
✓
Time & Date Stamping
✓
✓
✓
Pre-set Safety Limits (ACGIH TLV, US Navy, etc.)
✗
✓
✓
Tri-Sensor Compatible (Head-Torso-Ankle WBGT)
Optional
Optional
✗
Measurement Parameters

• Dry Bulb, Wet Bulb, and Globe Temperatures
• Relative Humidity (RH)
• WBGT (Indoor & Outdoor) Index
• Heat Index / HUMIDEX (44 & 46 models only)
• Temperature Reading: Celsius or Fahrenheit
• Data Logging Intervals: 1, 2, 5, 10, 15, 30, or 60 minutes

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) Compatible
• Event Logging Mode (48N model only)
• Time & Date Stamping for Compliance

Output

• RS-232 Serial Printer / Computer Interface
• Parallel Printer Interface

Power Source Options

• 9V Disposable Battery – 80 to 140 hours runtime (model dependent)
• NiMH Rechargeable Battery (Optional) – 160 to 300 hours runtime
• AC Power Adaptor for Continuous Operation

Mechanical Features

• IP54 Water & Dust Ingress Protection
• Tripod Mount / Remote Sensor Bar for up to 61m (~200ft) Distance Measurement

Physical Dimensions

• Size: 23.4 x 18.3 x 7.6 cm (9.2” x 7.2” x 3”)
• Weight: 1.2 kg (2.6 lbs) with Mounted Sensor Assembly

Compliance & Certifications

• CE Marked
• Complies with BS EN 27243 Standards