HIOKI FT3700-20 Infrared Thermometer | -60.0 to 550.0°C, D:S 12:1, dual-point laser marker, 1 s response, emissivity 0.10–1.00

HIOKI FT3700-20 Infrared Thermometer (Japan): Dual-Laser Targeting, 12:1 Long-Distance Measurement and 550°C High-Temperature Capability

Overview

The HIOKI FT3700-20 is a non-contact infrared thermometer designed for electrical inspection and industrial maintenance. A dual-point laser marks the diameter of the measurement spot. With a 12:1 distance-to-spot ratio, it can precisely target small hot spots even from a safe distance. Its -60.0 to 550.0°C measurement range (accuracy guaranteed -35 to 500°C) and 1 s (90% response) response time make it standard equipment for transformer monitoring, motor bearing temperature-rise checks and high-voltage distribution inspection.

Key Specifications

Visual Targeting

• Dual-point laser marker: Two laser dots mark the diameter of the measurement spot, making it easy to confirm that the target fully covers the spot (Class 2, max. 1 mW).
• 12:1 distance-to-spot ratio (D:S): At a distance of 1 m, the measurement spot is only about 8 cm. The optical resolution lets you obtain accurate data while staying away from hazards such as running machinery and high voltage.

Performance and Durable Design

• -60.0 to 550.0°C measurement range: Covers industrial temperature measurement from frozen goods to hot exhaust pipes and furnace shells.
• Simple one-handed operation: Pistol-grip design and large backlit display; in dim electrical rooms or tight spaces, just pull the trigger to get a reading instantly.
• Emissivity and power: Emissivity adjustable 0.10–1.00 (0.01 steps); LR03×2, approx. 140 h (laser and backlight off).

Data Functions

• Continuous max/min monitoring: While scanning with the trigger held, the display shows the maximum (MAX) and minimum (MIN) temperatures within the scanned area, making it quick to locate overheating hot spots.
• Adjustable emissivity: Emissivity can be set manually (0.10 to 1.00) for different materials such as painted surfaces and oxidized metal, improving measurement reliability.

Applications

• Substations and power engineering: Inspection of high-voltage cable joints, circuit breakers and transformer radiators.
• Electromechanical and safety maintenance: Checking motor bearings, inverter heat-sink modules and circuit board heating.
• Energy-saving diagnostics: Detecting steam line leaks and failed insulation.