Hioki Thermometers

Infrared non-contact thermometers for surface temperature measurement.

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Shop Hioki Thermometers

FT3700-20

Hioki FT3700-20 Infrared Thermometer 550°C

Non-contact infrared thermometer measuring -60 to 550°C with 12:1 distance-to-spot optics...

₹8,356 ₹6,267 + 18% GST

FT3701-20

Hioki FT3701-20 Infrared Thermometer 760°C

Extended-range non-contact infrared thermometer measuring -60 to 760°C with tight 30:1 di...

₹15,066 ₹11,299 + 18% GST

What is a Non-Contact Infrared Thermometer?

A non-contact infrared thermometer measures the surface temperature of an object from a distance, without ever touching it. It works by detecting infrared energy naturally emitted by any object and converting that into a temperature reading.

Why this matters: Many temperature checks in electrical and mechanical work involve targets that are dangerous or impossible to touch safely — live electrical connections, moving machinery, overhead equipment, or surfaces too hot to approach. An infrared thermometer lets you check these safely from a distance.

Key advantage: Spotting an overheating electrical connection or bearing before it fails can prevent a breakdown that costs far more than the instrument itself.

Why Choose Hioki Infrared Thermometers?

Hioki's FT3700-20 and FT3701-20 are built for safe, accurate non-contact temperature measurement:

1. True Non-Contact Safety

Check the temperature of live electrical connections, moving machinery, or overhead equipment without ever touching them — eliminating the risk of electric shock or mechanical injury.

2. Precise Targeting with a Two-Beam Laser

A two-beam laser marker shows exactly where you are measuring, so your reading corresponds to the right spot — especially important at longer distances.

3. Wide Temperature Range

The FT3700-20 measures from -60°C to 550°C, and the FT3701-20 extends to 760°C — covering everything from cold-chain checks to hot industrial process surfaces.

4. A Distance-to-Spot Ratio to Match the Job

The FT3700-20's 12:1 ratio suits general wide-area scanning; the FT3701-20's tighter 30:1 ratio lets you accurately measure small or distant targets without picking up the surrounding area.

5. Rugged, Simple Field Operation

Pull the trigger, read the temperature, release to hold the value. MAX/MIN/DIF/AVG modes and an alarm function make it easy to spot problems fast in the field.

The Two Hioki Infrared Thermometers We Stock

Both are non-contact infrared thermometers with a two-beam laser marker — they differ mainly in distance-to-spot ratio and maximum temperature:

Type	Model	Range	Best For	Distance-to-Spot Ratio
Infrared (Non-Contact)	FT3700-20	-60 to +550°C	Wide-area scanning, general electrical & HVAC checks	12:1
Infrared (Non-Contact)	FT3701-20	-60 to +760°C	Small or distant targets, higher-temperature process work	30:1

Infrared Thermometer Applications in Indian Industry

Non-contact surface temperature checks are used across these sectors:

Motor & Bearing Surface Checks

Check motor casing and bearing housing surface temperature from a safe distance to catch overheating before failure. Infrared measures external surface temperature only — not internal winding temperature, which needs a contact probe.

Transformer & Switchgear Hot-Spot Checks

Scan transformer tanks, switchgear panels and busbar connections for abnormal hot spots without opening panels or making contact with live equipment.

HVAC Equipment Commissioning

Check duct, coil and discharge-line surface temperatures to verify HVAC performance without attaching contact probes.

Solar Inverter & Enclosure Checks

Check inverter enclosure surface temperature to spot overheating that may be causing output de-rating. This measures enclosure surface temperature, not internal component temperature.

Preventive Maintenance Spot-Checks

Regular infrared spot-checks on electrical connections, panels and machinery surfaces catch abnormal heating before it causes failure. Note: these models show real-time MAX/MIN/DIF/AVG but do not log data over time — ask us about Hioki data loggers if you need automated trend records.

Food & Cold Chain Surface Checks

Quickly check surface temperatures of cold storage units, delivery vehicles and food-contact surfaces without touching them — useful for spot compliance checks. For continuous logged records, a dedicated data logger is required.

Frequently Asked Questions

What does "distance-to-spot ratio" mean?

It's the ratio between your distance from the target and the diameter of the area being measured. The FT3700-20's 12:1 ratio means at 1000mm distance, the measured spot is about 83mm wide. The FT3701-20's 30:1 ratio gives a tighter, more precise spot at the same distance — useful for small or distant targets.

What's the difference between the FT3700-20 and FT3701-20?

Both are non-contact infrared thermometers with the same core design. The FT3700-20 (12:1 ratio, up to 550°C) suits general wide-area scanning. The FT3701-20 (30:1 ratio, up to 760°C) has a tighter beam for small or distant targets and a higher maximum temperature, suited to hotter process work.

Is the laser marker safe to use?

Yes. Both models use a Class 2 laser per IEC 60825-1, which is safe for incidental viewing, but as with any laser device you should avoid staring directly into the beam or pointing it at other people.

Does emissivity affect my reading?

Yes. Infrared thermometers measure emitted infrared energy, and different surfaces emit it differently — a shiny metal surface emits differently to a matte painted one. For most general electrical and mechanical surfaces the default setting works well, but highly reflective surfaces can give a reading lower than the true temperature.

Can these thermometers log data over time?

No. The FT3700-20 and FT3701-20 show real-time MAX/MIN/DIF/AVG readings during a scan but do not store logged data over time. If you need automated trend logging, ask us about Hioki's data logger range.

Can infrared thermometers measure internal temperatures, like motor windings?

No. Infrared thermometers only measure the surface temperature of whatever is in their direct line of sight. For internal temperatures — motor windings, pipe interiors — you need a contact probe or an embedded sensor instead.

What surface temperature should I be concerned about on motors and transformers?

As a rough guide: motor casings running noticeably hotter than nearby identical motors under the same load, or transformer tank surfaces above about 60-70°C in continuous operation, both warrant closer investigation. Surface readings are a good early screening tool, but a confirmed problem should be verified with internal measurement or by a qualified engineer.

Buy Hioki Thermometers in India

Industrial Supply Syndicate is an authorized independent reseller of Hioki thermometers in India. We stock the complete range and ship pan India with GST invoice. For bulk orders, institutional procurement, and tender requirements, please contact us for special pricing.