1. Introduction
The Victor 302B is a professional handheld non-contact infrared thermometer designed for convenient use, strict design, high measurement accuracy, and a broad temperature measurement range. It features laser aiming, a backlit LCD display, an over-temperature alarm, an adjustable emissivity rate, and automatic shutdown. This instrument allows for quick and accurate temperature measurement of objects by simply aiming its probing window.
All objects with a temperature higher than absolute zero transmit infrared radiation energy proportional to their temperature. The distribution of this radiation energy, based on size and wavelength, is closely related to the object's surface temperature. By accurately measuring the infrared transmission energy, the thermometer can determine the precise temperature of the measured object.
Figure 1: Victor 302B Infrared Thermometer highlighting features like laser positioning, quick measurement, adjustable emissivity, voice prompt, unit conversion, automatic shut-down, backlit display, and ease of operation.
Figure 2: Detailed view of the Victor 302B Infrared Thermometer with its main features.
2. Safety Information
Please read and understand the following safety precautions before using the thermometer:
- The product must be used carefully when the laser beam is activated.
- Do not aim the laser beam directly at the eyes of people or animals.
- Avoid aiming the laser beam at reflective surfaces that could reflect the beam into people's eyes.
- Do not use the laser beam in the presence of explosive gases.
3. Product Overview
Familiarize yourself with the components of your Victor 302B Infrared Thermometer:
Figure 3: Labeled diagram of the thermometer's components, including the laser emission hole, temperature detection hole, measuring trigger, battery compartment, LCD display, backlight, temperature switch key, and laser light button.
Packaging Contents
The standard package includes:
- 1 x Victor 302B/303B Infrared Thermometer
- 1 x Product Manual
- Blister packaging
Note: Batteries are not included in the standard package due to international air shipping regulations. Please purchase one 9V battery (NEDA1604/6F22 or similar model) from your local store.
Figure 4: Contents of the product packaging.
4. Setup
Battery Installation
- Open the battery compartment located on the handle.
- Insert one 9V battery (NEDA1604/6F22 or similar model), ensuring correct polarity.
- Close the battery compartment securely.
For precise temperature readings, allow the thermometer to stabilize for 10 minutes after battery installation or after moving it to a new environment.
Emissivity Adjustment
The emissivity (ε) can be adjusted from 0.1 to 1.0 to match the material of the object being measured, ensuring more accurate readings. The default emissivity is 0.95.
Figure 5: Emissivity adjustment interface showing E=0.95.
To adjust emissivity:
- Press and hold the EMITM key. The instrument will enter the setting interface, and the emissivity value (e.g., "ε=0.95") will flash.
- Press the UP or DOWN keys to adjust the emissivity value.
- Release the EMITM key to save the setting.
5. Operating Instructions
Basic Measurement
- Ensure the thermometer has stabilized for 10 minutes after battery installation or environmental change.
- Aim the temperature detection hole at the object to be measured.
- Press the Measuring Trigger on the handle. The thermometer will start automatically.
- Upon hearing a "beep" sound, the measured temperature will be displayed on the LCD.
Note: Before measurement, select the appropriate emissivity for the object and adjust the measuring distance according to the object's size.
Figure 6: Laser aiming for high precision measurement. The device offers an error of ±2.0°C or ±2%, a measurement time of ≤0.5 seconds, and a distance-to-spot ratio (D:S) of 12:1.
Key Functions and LCD Signs
Figure 7: Key functions and LCD display indicators.
| Sign | Function Description |
|---|---|
| Up | Press "EMITM" key to select emissivity setting (sign " " displayed). Press "up" for upward adjustment. Keep pressing the measuring key, then press "up" to turn on/off backlight. Press "up" and test key to trigger "up" to turn on/off infrared laser light. |
| Down | Functional Key: Press "EMITM" key to select emissivity setting (sign " " displayed). Press "down" for downward adjustment. Keep pressing the measuring key, then press "down" to turn on/off infrared laser light. |
| Select | Functional Key: Press the key circularly to select maximum value (MAX), average value (AVG), minimum value (MIN), difference between max and min value (DIF), data hold (HOLD), low temperature alarm (LAL), high temperature alarm (HAL), zero offset adjustment (offset), and emissivity setting (E). |
| EMITM | Press "EMITM" key to select emissivity setting (sign " " displayed). Use "up" and "down" to adjust emissivity. |
| °C/°F | Press this key to select the conversion between Celsius and Fahrenheit degrees. |
| °C | Temperature unit: Celsius degree |
| °F | Temperature unit: Fahrenheit degree |
| Auditory tone cues | Indicates various alerts or confirmations. |
| " " | Indicates over low battery voltage. |
| "HR" | Indicates over-high ambient temperature. |
6. Specifications
Figure 8: Comparison of specifications for Victor 303B and 302B models.
| Main Function | 303B | 302B |
|---|---|---|
| Temperature Range | -20℃～550℃ (-4℉～1022℉) | -32℃～380℃ (-25.6℉～716℉) |
| Resolution | 0.1℃/0.1℉ | 0.1℃/0.1℉ |
| Accuracy | ±2.0℃ or ±2% | ±2.0℃ or ±2% |
| Auto Power Off | ✓ | ✓ |
| Backlight | ✓ | ✓ |
| Data Hold | ✓ | ✓ |
| Distance Spot Ratio | 12:1 | 12:1 |
| Emissivity | 0.1～1.0 adjustable | 0.1～1.0 adjustable |
| Size | 97*43*160mm | 93*37*143mm |
| Weight | 130g | 105g |
| Power | 9V battery | 1.5V*2 battery |
Emissivity of Common Objects
Use the following table as a guide for adjusting emissivity based on the material being measured:
Figure 9: Emissivity values for common materials.
| Material Name | Specification | Emissivity | Material Name | Specification | Emissivity |
|---|---|---|---|---|---|
| Aluminum | Oxidized | 0.20-0.40 | Human skin | 0.98 | |
| Polished | 0.02-0.04 | Graphite | Oxidized | 0.20-0.60 | |
| Copper | Oxidized | 0.40-0.80 | Plastic | Transparency | 0.95 |
| Polished | 0.02-0.05 | > 0.5mm | |||
| Gold | 0.01-0.10 | Rubber | 0.95 | ||
| Iron | Oxidized | 0.60-0.90 | Plastic | 0.85-0.95 | |
| Steel | Oxidized | 0.70-0.90 | Concrete | 0.95 | |
| Asbestos | 0.95 | Cement | 0.96 | ||
| Gyp | 0.80-0.90 | Soil | 0.90-0.98 | ||
| Asphalt | 0.95 | Mortar | 0.89-0.91 | ||
| Pottery | 0.95 | Brick | 0.93-0.96 | ||
| Wood | 0.90-0.95 | Marble | 0.94 | ||
| Charcoal | Powder | 0.96 | Textile | 0.90 | |
| Lacquer | 0.80-0.95 | Paper | Various colors | 0.94 | |
| Lacquerware | Lack of luster | 0.97 | |||
| Carbon cement | 0.90 | Sand | 0.90 | ||
| Soap bubble | 0.75-0.80 | Clay | 0.92-0.96 | ||
| Water | 0.93 | Grit | 0.95 | ||
| Snow | 0.83-0.90 | Glass | Tableware | 0.85-0.92 | |
| Ice | 0.96-0.98 | Textile | 0.95 |
7. Maintenance and Storage
Cleaning
- The protective lens of the probe is the most easily damaged part of an infrared thermometer and must be protected carefully.
- To clean the lens of the probe, wipe it gently with a cotton swab or soft fabric soaked in water or alcohol.
Battery Care
- The battery shall not be charged or thrown into fire.
- Used batteries shall be discarded at specified recycling places.
- Caution: The battery shall be taken out if the product is left unused for a long period.
General Care
- The product shall not be soaked in water or exposed to direct sunshine.
- Do not drop or impact the product heavily, as it may be damaged.
- If the product fails to measure accurately due to incorrect distance or aiming, it is recommended to measure the object again or multiple times.
8. Troubleshooting
No specific troubleshooting steps are provided in the available information. If you encounter issues, please refer to the key functions and LCD signs description for common indicators like low battery or high ambient temperature. For persistent problems, contact customer support.
9. User Tips
Based on general usage of infrared thermometers:
- For best accuracy, ensure the target object fills the measurement spot size. The D:S ratio of 12:1 means that at 12 inches distance, the measurement spot is 1 inch in diameter.
- Always allow the thermometer to acclimate to the ambient temperature of the measurement environment for at least 10 minutes before use.
- Clean the lens regularly to prevent dust or debris from affecting readings.
10. Warranty and Support
A repair guarantee is provided for the product for one year from the date of purchase. Please note that damages resulting from abnormal use or user disassembly are outside the scope of this warranty.
To claim warranty service, please keep your repair warranty card and purchasing credentials. For further assistance or inquiries, please contact customer service.
Video: Overview of the Ruoshui factory, showcasing manufacturing processes and quality control for various instruments, including multimeters and thermometers.
