1. Introduction
The NJTY Digital Infrared Thermometer is a non-contact device designed for accurate temperature measurement in various industrial and household applications. It provides quick and reliable readings without physical contact, making it safe and convenient for measuring surfaces in metal processing, heating, ventilation, refrigeration, and food preparation. This manual provides essential information for the safe and effective operation and maintenance of your thermometer.
Figure 1: NJTY Infrared Thermometer in use, highlighting its fast response.
2. Safety Information
- Non-Human Use: This device is designed for measuring the temperature of inanimate objects only. It is NOT suitable for measuring body surface temperature, forehead temperature, or for use on babies or animals. Measuring human or animal temperature will yield incorrect results.
- Laser Safety: The thermometer uses a laser for targeting. Avoid direct eye exposure to the laser beam. Do not stare into the beam.
- Operating Environment: Use the thermometer within the specified ambient working temperature range (0-50°C) and relative humidity (10-90% RH non-condensing).
- Battery Safety: Ensure correct battery polarity when installing. Do not mix old and new batteries or different types of batteries. Remove batteries if the device is not used for an extended period.
Figure 2: Laser warning label on the side of the thermometer.
3. Product Features
- Non-contact measurement for safety and hygiene.
- Digital display for clear and easy-to-read temperature readings.
- High precision sensor with 0.5-second fast response time.
- Durable construction using high-quality ABS material.
- Laser pointer for accurate targeting of measurement area.
- Backlight for visibility in low-light conditions.
- Temperature unit selection (°C/°F).
- Data Hold function.
- Adjustable emissivity (models T400A, T600A) for improved accuracy on various surfaces.
Figure 3: Key components: sensor, ABS material, and battery bay.
4. Specifications
| Feature | Specification |
|---|---|
| Measuring Range (T400/T400A) | -50°C to 400°C (-58°F to 752°F) |
| Measuring Range (T600/T600A) | -50°C to 600°C (-58°F to 1112°F) |
| Measurement Accuracy (≥ 0°C) | ± 1.5°C |
| Measurement Accuracy (< 0°C) | ± 3°C |
| Emissivity (T400/T600) | 0.95 (Not adjustable) |
| Emissivity (T400A/T600A) | 0.95 preset, adjustable range 0.10-1.00 |
| Response Time | 0.5 seconds (95% response) |
| Response Wavelength | 8-14µm |
| Object Distance Ratio | 12:1 |
| Ambient Working Temperature | 0-50°C |
| Relative Humidity | 10-90% RH non-condensing |
| Power Supply | 2 x 1.5V AAA Batteries |
| Display Type | Digital |
| Style | Handheld |
Figure 4: Detailed specifications for the T600A model.
Figure 5: Detailed specifications for the T400A model.
5. Setup
5.1 Battery Installation
- Locate the battery bay cover, typically at the bottom of the handle.
- Open the battery bay cover.
- Insert two (2) 1.5V AAA batteries, ensuring correct polarity (+/-) as indicated inside the compartment.
- Close the battery bay cover securely.
The device requires 2x AAA batteries for operation. Batteries are typically not included with the product.
Figure 6: Location of the battery bay.
6. Operating Instructions
6.1 Taking a Measurement
- Point the thermometer at the target surface. Ensure the target is within the device's object distance ratio (12:1).
- Press and hold the trigger to activate the laser pointer and begin measurement. The temperature reading will appear on the digital display.
- Release the trigger to hold the current temperature reading on the display (HOLD function).
6.2 Switching Temperature Units (°C/°F)
Press the dedicated °C/°F button on the device to toggle between Celsius and Fahrenheit temperature units.
6.3 Backlight Control
Press the backlight button (often indicated by a light bulb icon) to turn the display backlight on or off for better visibility in different lighting conditions.
6.4 Emissivity Adjustment (T400A, T600A models only)
For models T400A and T600A, the emissivity can be adjusted to improve measurement accuracy for different materials.
- Access the emissivity adjustment mode (refer to device buttons, usually an "EMIS" or similar button).
- Use the up/down arrows or dedicated buttons to set the emissivity value between 0.10 and 1.00.
- Consult a reference table for common material emissivity values to ensure accurate readings.
Figure 7: Adjustable emissivity range.
7. Maintenance
- Cleaning: Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the lens is clean and free of dust or debris for accurate readings.
- Storage: Store the thermometer in a cool, dry place away from direct sunlight and extreme temperatures. If storing for an extended period, remove the batteries to prevent leakage.
- Battery Replacement: Replace batteries when the low battery indicator appears on the display. Follow the battery installation steps in Section 5.1.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on | Dead or incorrectly installed batteries | Replace batteries, ensuring correct polarity. |
| Inaccurate readings |
|
|
| Laser not visible | Laser function disabled or malfunction | Check if there's a dedicated laser button to activate it. If not, contact support. |
9. User Tips
- Emissivity Matters: For models with adjustable emissivity (T400A, T600A), setting the correct emissivity for the material you are measuring is crucial for accuracy. Different surfaces (e.g., shiny metal vs. painted wood) have different emissivities.
- Distance to Spot Ratio: Remember the 12:1 object distance ratio. This means that at 12 inches from the target, the measurement spot diameter is 1 inch. For accurate readings, ensure the target area is larger than the measurement spot.
- Surface Condition: Be aware that shiny or polished surfaces can reflect ambient temperatures, potentially leading to inaccurate readings. For such surfaces, consider applying a matte black paint or tape to the measurement area if feasible.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
