1. Introduction
This manual provides detailed instructions for the safe and effective use of your NJTY Infrared Thermometer. These non-contact thermometers are designed for quick and accurate temperature measurement across various applications, including industrial, kitchen, and general household use. Please read this manual thoroughly before operation and retain it for future reference.
NJTY Multi-function Infrared Thermometer (T400/T600 with fixed emissivity, T400A/T600A with adjustable emissivity)
Key Features:
- 0.5-second rapid response time
- Laser positioning for precise targeting
- One-touch measurement operation
- Audio-visual alert system with backlight
- Switchable temperature units (Celsius and Fahrenheit)
- Low voltage indication
- Automatic shutdown feature
- Compact size and comfortable grip
- High-definition backlit display for visibility in dark conditions
Important Safety Note: This device is not suitable for measuring human or animal body temperature.
2. Setup
2.1 Package Contents
Please check the package to ensure all components are present:
- NJTY Infrared Thermometer (T400, T400A, T600, or T600A model)
- User Manual
Note: AAA batteries are not included and must be purchased separately.
2.2 Battery Installation
- Locate the battery lock latch at the bottom of the handle.
- Slide the latch to open the battery compartment.
- Insert two (2) AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment by sliding the latch back into place until it clicks securely.
Battery compartment for 2x AAA batteries
2.3 Device Overview
Familiarize yourself with the main components of your thermometer:
Infrared Thermometer Components
- Temperature Sensing Area: The infrared sensor that detects temperature.
- Infrared Laser Point: Emits a laser dot for targeting the measurement area.
- Laser Point Switch: Button to activate/deactivate the laser.
- Measurement Trigger: Press to take a temperature reading.
- Display Screen: Shows temperature readings, unit, and other indicators.
- Backlight Button: Activates/deactivates the display backlight.
- Celsius/Fahrenheit Switch Button: Toggles between °C and °F units.
- Battery Lock Latch: Secures the battery compartment.
3. Operating Instructions
3.1 Taking a Measurement
- Point the thermometer at the object you wish to measure.
- Press and hold the measurement trigger. The laser pointer (if activated) will indicate the center of the measurement area.
- The temperature reading will appear on the display screen within 0.5 seconds.
- Release the trigger to hold the reading on the screen. The device will automatically shut down after a period of inactivity to conserve battery.
Quick measurement with laser positioning
3.2 Switching Temperature Units
Press the '°C/°F' button to toggle between Celsius and Fahrenheit temperature units on the display.
Celsius/Fahrenheit switchable measurement
3.3 Understanding Distance to Spot Ratio (D:S)
The thermometer has a Distance to Spot Ratio (D:S) of 12:1. This means that at a distance of 12 units, the measurement spot diameter will be 1 unit. For example, if you are 12 inches away from an object, the measurement area will be 1 inch in diameter. To ensure accurate readings, especially for smaller objects, measure from a closer distance. It is recommended not to exceed 1 meter for testing, as measuring from too far away may result in mixed temperature readings due to air and dust interference.
Distance to Spot Ratio (D:S = 12:1)
3.4 Emissivity Settings
Emissivity is a measure of an object's ability to emit infrared energy. Different materials have different emissivity values. Models T400 and T600 have a fixed emissivity of 0.95, which is suitable for most organic materials and painted surfaces. Models T400A and T600A feature adjustable emissivity, allowing for more accurate measurements on a wider range of materials.
For models with adjustable emissivity, refer to the Emissivity Reference Table below to set the appropriate value for the material being measured. Adjusting emissivity ensures the most accurate temperature readings.
Emissivity Reference Table
4. Maintenance
4.1 Cleaning
- Lens Cleaning: Use a soft, clean cloth or cotton swab with water or medical alcohol. Wipe gently to avoid scratching the lens.
- Housing Cleaning: Clean the device housing with a damp sponge or soft cloth and mild soap. Do not use abrasive cleaners or immerse the device in water.
4.2 Battery Replacement
When the low voltage indicator appears on the display, replace the batteries as described in Section 2.2. Always use two new AAA batteries of the same type.
4.3 Storage
Store the thermometer in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity. Remove batteries if the device will not be used for an extended period to prevent leakage.
5. Troubleshooting
- No Display/Device Not Turning On: Check battery installation and ensure batteries are not depleted. Replace if necessary.
- Inaccurate Readings:
- Ensure the D:S ratio is respected; measure closer to the target for smaller objects.
- For T400A/T600A models, verify the emissivity setting matches the material being measured.
- Ensure the lens is clean and free from obstructions.
- Avoid measuring through glass or other transparent surfaces, as infrared thermometers measure the surface temperature of the glass itself.
- Allow the thermometer to stabilize in the environment where it will be used if moving between areas with significant temperature differences.
- Low Voltage Indication: Replace the AAA batteries.
- Automatic Shutdown: This is a normal power-saving feature. The device will turn off after a period of inactivity.
6. Specifications
The following table outlines the technical specifications for the NJTY T400, T400A, T600, and T600A infrared thermometer models:
Parameter Table for T400 and T400A Models
Parameter Table for T600 and T600A Models
| Feature | T400 / T400A | T600 / T600A |
|---|---|---|
| Measuring Range | -50~400°C (-58~752°F) | -50~600°C (-58~1112°F) |
| Accuracy (≥0°C/32°F) | ±1.5°C (±2.7°F) or ±1.5%, whichever is greater | |
| Accuracy (<0°C/32°F) | ±3°C (±5.4°F) or ±3%, whichever is greater | |
| Emissivity | T400: preset to 0.95 T400A: adjustable | T600: preset to 0.95 T600A: adjustable |
| Maximum Value | N.A. (T400) Checked (T400A) | N.A. (T600) Checked (T600A) |
| Repeatability | % of the reading or 1°C | |
| Response Time | 500mSec, 95% response | |
| Response Wavelength | 8-14um | |
| Operating Temperature | 0-50°C (32-122°F) | |
| Storage Humidity | 10-90% RH non-condensing (excluding batteries) | |
| Power Supply | AAA*2 batteries | |
| Magnification Ratio (D:S) | 12:1 | |
| Net Weight (excluding batteries) | Approximately 122 grams | |
| Gross Weight (including packaging) | Approximately 166 grams | |
| Dimensions (H x W x D) | 145mm x 78mm x 43mm | |
Thermometer Dimensions
7. Warranty and Support
For warranty information and technical support, please contact the seller or retailer from whom you purchased this product. Keep your purchase receipt as proof of purchase.
8. User Tips
- Surface Preparation: For highly reflective surfaces (e.g., polished metals), consider applying a piece of masking tape or flat black paint to the surface and measuring the temperature of that spot for a more accurate reading.
- Environmental Factors: Be aware that steam, dust, smoke, or other airborne particles can interfere with accurate infrared measurements. Try to measure in clear conditions.
- Not for Internal Temperature: Remember, this device measures surface temperature. It is not designed for or accurate in measuring internal temperatures of objects or living beings.
- Battery Life: To maximize battery life, always turn off the laser pointer when not needed and utilize the automatic shutdown feature.
