The 381a is a non-contact and contact temperature tester with laser sighting to confirm your target.
Frequently Asked Questions
- What does “distance to spot ratio” mean?
The laser spot needs to be showing inside the target area. An 8:1 “distance to spot ratio” means you are measuring a 1” diameter area at a distance of 8”.
- How far can I measure?
Distance is unlimited. The size of the target area sets the limit on distance for accurate measurements. Example: If the area you wish to measure is 1 foot in diameter, then you will need to be within 8 feet to record an accurate temperature.
- What is the smallest target I can read?
Approximately one-half inch in diameter.
- What is emmisivity?
This is a ratio of an object’s infrared emission compared to a theoretical black body considered 1. Emissivity is always less than 1. Adjustable emissivity allows your non-contact thermometer to be adjusted to the surface you are checking to make readings more accurate.
|Model 381a Specifications|
|Temperature Range|| Non-contact: -4° to 572°F (-20° to 300°C)
Contact:* -148° to 2192°F (-100° to 1200°C)
|IR Accuracy @ 23°C and 0.95 emissivity|| ± 5°F (3°C) below 32°F (0°C)
32°F to 572°F (0°C to 300°C) ± 2% of rdg
or ± 3.5°F (2°C) whichever is greater
|Contact Accuracy||+(0.5% of reading + 3.5°F (2°C)|
|Distance to Spot Ratio||9:1|
|Spectral Response||7 to 14um|
|Laser Sighting||Output <1mW, Wavelength 645-660nm, Class II Laser|
|°F or °C||Selectable (slide switch in handle)|
|Contact or Non-contact||Selectable (slide switch in handle)|
|Operating Temperature||32°F to 120°F (0°C to 50°C)|
* Depends upon temperature probe range
- Ideal for under-floor heating
- Check for cold spots on radiators
- Read temperatures in Hard to Reach Areas
Distance to Spot Ratios (D:S) for TPI IR (Non-contact) Thermometers:
Models 375 / 376 / 377 (11.5:1):
Models 380 / 381 / 383 / 384 (9:1):