DHS40 Series Heat Spy High Performance Handheld Infrared Pyrometers

DHS40 Series Heat Spy High Performance Handheld Infrared Pyrometers

The ONLY Portable Infrared on the market with models for measuring Cold Metal, Thru Flame and Burning Gas, Glass, and Thin-Film Plastics.

This model replaces the DHSA24, DHSA26, DHSA28, DHS29X, and DHS35XT Series units. Please contact us for assistance in selecting the correct model.

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The NEW DHS40 High Performance Heat Spy Handheld Infrared Pyrometers are an updated and expanded line of our classic high performance Heat Spy line. This industrial infrared temperature sensor series features an accuracy of up to 0.25% of of reading and 1°C / 1°F resolution. Available in 10 different spectral ranges and temperature ranges, the DHS40 Handheld Infrared Pyrometer has the most options of any manufacturer.

The DHS40 series is available for use with Ferrous Metal (1M), Hot Metal & Hot Ceramic (2M), and Low Temperature Processes (LT) models. This is the only hand held portable infrared on the market for use with models for Cold Ferrous Metal (3M), Combustion Through Flame (MT), Burning Gas (F4), Glass > 1 mm thick (G5), Glass < 1 mm thick (G7), Thin Film Plastics (P3), and Thin Polyester Films (P7).

The case is made of cast and extruded aluminum for lightweight and rugged durability, as well as additional shielding against EMF interference originating from machinery and engines.

Both photodiode and thermopile sensors are used, depending on the spectral range and applications of each model.

DHS40 Series models and applications

Model Code Type Spectral Range Temperature Span Application
1M Ferrous Metal 1.0μm 1112° to 5432°F (600° to 3000°C) Ferrous Metal
Molten Glass
Molten Metal
Molten Ceramics
Hot Graphite
2M Hot Metal & Hot Ceramic 1.6μm 752° to 4172°F (400° to 2300°C) Hot Metals & Hot Ceramics
3M Cold Ferrous Metal 2.4μm 302° to 2192°F (150° to 1200°C) Cold Ferrous Metal
Iron, Steel, and Steel Alloy
MT Thru Flame 3.9μm 1112° to 2732°F (600° to 1500°C) Through hot furnace gases and clean
burning gas flames, indicates correct
temperatures of substances during warm up process in industrial furnaces
F4 Burning Gas 4.11 - 4.72μm 752° to 2912°F (400° to 1600˚C) CO2 Gas (4.24 Micron) in Chimney
NO2 Gas (4.55 Micron) in Combustion
Hot CO Gas (4.66 Micron) in Combustion
Flame Temperature in Boiler / Furnace
Utility Power Station
Biomass Boilers
Garbage Incinerators
Hazardous Waste
G5 Thick Glass 5.0μm 752° to 4082°F (400° to 2250°C) Thick Glass above 1 mm thickness
Flat Glass Production
Glass Bending
Automobile Glass Assembly
G7 Thin Glass 7.9μm 104° to 1832°F (40° to 1000°C) Thin Glass Below 1 mm thickness
Light Bulb Production
Medical Vial Production
P3 Thin Film Plastics 3.43μm 212 °to 932°F (100° to 500°C) Plastic Thin Film (1 to 3 mm), Polyethylene
Films and all types of fluorocarbon-plastics
Polyethylene (PE)
Polypropylene (PP)
Polyamide (Nylon)
Polystyrene (PS)
Polyvinyl Chloride (PVC)
Vinyl / Acrylic / Polycarbonate
P7 Thin Film Plastics 7.9μm 104° to 1112°F (40° to 600°C) Plastic Thin Film, (1 to 3 mm) Polyester
Films and all types of fluorocarbon-plastics
Cellulose Acetate
Teflon (Fluoroplastic FEP)
Polyvinyl Chloride (PVC)
Acrylic / Polycarbonate
Polyamide (Nylon)
Polyester (>10 μm)
LT Low Temperature 8 to 14μm -40° to 1472°F (-40° to 800˚C) Organic Materials
Baking Production
Painted Metal Surfaces
Rubber, Tires
Thicker Plastics

The DHS40 comes in a attache style foam lined, locking carrying case. Case is watertight, dust proof, and features an auto air purge. Case dimensions: 18.1 inches x 12.9 inches x 4 inches.

Additional information

Sensor Specifications: Ambient Temperature

0° to 50°C (32° to 122°F)

Sensor Specifications: Storage

-20° to 70°C (-4° to 158°F)

Sensor Specifications: Relative Humidity

10% to 95% non-condensing

Housing Material

Cast and Extruded Aluminum

Housing Dimensions

13 inches x 6 inches x 15.5 inches
330.2 mm x 152.4 mm x 393.7mm


2.2 lbs (0.99 kg)


128 x 64 dot


4 Key: Menu, Up, Down, and Enter


High or Low

Signal Processing

Max, Min, Average, Delta T


9V Alkaline Battery

Battery Life

Approximately 30 hours


± 0.25% of reading or ± 1°C
± 0.6% of reading or ± 1°C depending on model


± 0.10% of reading or ± 0.30% of reading depending on model

LCD Resolution

1°F / 1°C

Response Time

5 mS, 150 mS, or 750 mS, depending on model

Adjustable Emissivity

Adjustable between 0.10 and 1.00

Trigger Lock


LCD Backlight


Laser Sighting

Available on models 1M, 2M, 3M, MT, G5, P7, G7. and LT

Storage Temperature

-4° to 158°F (-20° to 70°C)