1. Introducció
The BENETECH Non-Contact Infrared Thermometer is designed for quick and accurate temperature measurement of various surfaces without physical contact. It is ideal for measuring high-temperature, hazardous, or hard-to-reach objects. The device operates by detecting the infrared energy radiated from an object's surface, converting it into an electrical signal, and displaying the temperature reading on an LCD screen.
This unit consists of an optical system, photoelectric sensor, signal amplifier, signal processing circuit, and LCD display. The optical system converges infrared energy radiated from the object's surface onto the photoelectric sensor, which converts the energy into a corresponding electrical signal. This signal is then amplified and processed into a digital reading displayed on the LCD.
2. Informació de seguretat
2.1. Avisos
- Do not point the laser directly at eyes or indirectly at eyes via reflective surfaces when using this unit.
- This instrument cannot measure through transparent surfaces. For example, glass, plastic, etc. Otherwise, the measured value will be the surface temperature of the transparent object.
- Moisture, dust, smoke, or other particles will obstruct the instrument's lens, affecting measurement accuracy.
2.2. Precaucions
- Protect the thermometer from electromagnetic fields (EMF) generated by arc welders and induction heaters.
- If moving between environments with large or drastic changes in ambient temperature (thermal shock), wait 30 minutes for the thermometer to stabilize before use.
- Do not place the thermometer near or on high-temperature objects.
3. Producte acabatview
3.1. Components
The thermometer features a pistol-grip design for comfortable handling. Key components include:
- Infrared Sensor & Laser Aperture
- Pantalla LCD
- Disparador
- Control Buttons (MODE, UP/Laser, C/F)
- Compartiment de la bateria
Figura 1: Frontal view of the GM333 model, showing the display, buttons, and trigger.
Figura 2: lateral view of the GM333 model, highlighting the trigger and battery compartment location.
Figura 3: superior view of the GM333 model, illustrating the Distance-to-Spot (D:S) ratio.
3.2. LCD Display Indicators (Refer to Figure 4 in the manual image)
Figure 4: Excerpt from the manual showing LCD display and button functions.
- HOLD Symbol: Indicates the last measurement is held on the display.
- Laser Aiming Symbol: Shows when the laser pointer is active.
- Backlight On Symbol: Indicates the display backlight is active.
- Emissivity Symbol: Displays the current emissivity setting.
- Símbol de bateria baixa: Alertes quan la bateria és baixa.
- Auto Power Off Symbol: Indicates the auto-off feature is active.
- Ambient Temperature Symbol: Mostra la temperatura ambient actual.
- MAX/MIN Symbols: Indicate maximum or minimum temperature modes.
- °C/°F Unit Symbols: Shows the selected temperature unit (Celsius or Fahrenheit).
- Current Measurement Reading: The main temperature value.
4. Especificacions
| Paràmetre | GM333 / GM333A | GM533A |
|---|---|---|
| Measurement Temperature Range | -50 °C a 400 °C (-58 °F a 752 °F) | -50 °C a 530 °C (-58 °F a 986 °F) |
| Precisió de la mesura | 0°C ~ 400°C (32°F ~ 752°F): ±1.5°C (±2.7°F) or ±1.5% -50°C ~ 0°C (-58°F ~ 32°F): ±3°C (±5°F) | |
| Resolució | 0.1 °C o 0.1 °F | |
| Repetibilitat | 1% de lectura o 1°C | |
| Temps de resposta | 500 mSeg, resposta del 95%. | |
| Resposta espectral | 5h-14h | |
| Distance Spot Ratio (D:S) | 12:1 | |
| Emissivitat | 0.95 (fixat) | 0.10-1.00 (ajustable) |
| Temperatura de funcionament | De 0 °C a 40 °C (32 °F a 104 °F) | |
| Humitat de funcionament | 10% RH - 90% RH non-condensing | |
| Temperatura d'emmagatzematge | -20 °C a 60 °C (-4 °F a 140 °F) | |
| Poder | 2 piles AAA de 1.5 V | |
| Durada de la bateria | Aprox. 12 hores | |
4.1. Emissivity Table (Common Materials)
Figure 5: Excerpt from the manual showing common material emissivity values.
| Material | Emissivitat |
|---|---|
| Pedra | 0.70 |
| Gel | 0.97 |
| Pintar | 0.93 |
| Aigua | 0.93 |
| Fusta | 0.94 |
| Cautxú | 0.95 |
| formigó | 0.94 |
| Asfalt | 0.94 |
| Maó | 0.93 |
| Paper | 0.90 |
| Ceràmica | 0.92 |
| Vidre | 0.85 |
| Ferro | 0.70 |
| coure | 0.78 |
| Alumini | 0.90 |
| Oli | 0.94 |
| Menjar | 0.90 |
| Pell | 0.98 |
5. Configuració
5.1. Instal·lació de la bateria
- Locate the battery compartment on the handle (refer to Figure 2).
- Obriu la tapa del compartiment de la bateria.
- Insert two (2) 1.5V AAA batteries, ensuring correct polarity.
- Tanqueu bé la tapa del compartiment de la bateria.
6. Instruccions de funcionament
6.1. Quick Measurement
- Pull the trigger to turn on the device. The LCD will display "SCAN" and the current temperature.
- Aim the laser pointer at the center of the object you wish to measure.
- Release the trigger. The temperature reading will be held on the display ("HOLD" symbol will appear).
- El dispositiu s'apagarà automàticament després d'aproximadament 20 segons d'inactivitat.
6.2. Locating Hot Spots
To find a hot spot, aim the thermometer at the area and slowly scan the region by moving the laser spot up and down. The highest temperature detected will be displayed.
Figure 6: Excerpt from the manual illustrating hot spot location technique.
6.3. Funcions del botó
- C/F Button (Red Button): Press to switch between Celsius (°C) and Fahrenheit (°F) temperature units.
- UP Arrow / Laser Button:
- Press to turn the laser pointer ON or OFF.
- In Emissivity (EMS) or Calibration (CAL) mode, use this button to increase values.
- DOWN Arrow / MODE Button:
- Press to cycle through measurement modes: MAX (Maximum), MIN (Minimum), AVG (Average), DIF (Difference), EMS (Emissivity), CAL (Calibration), and back to the standard measurement interface.
- In Emissivity (EMS) or Calibration (CAL) mode, use this button to decrease values.
Note on MAX/MIN modes: When in MAX or MIN mode, hold the trigger to continuously measure. The display will show the maximum or minimum temperature recorded during that continuous measurement session.
6.4. Advanced Functions (GM333A & GM533A only)
- Emissivitat ajustable: In EMS mode, use the UP/DOWN buttons to adjust the emissivity value between 0.10 and 1.00.
- Autocalibració: In CAL mode, use the UP/DOWN buttons to adjust the calibration offset between -5.0°C and +5.0°C.
- Alarma de temperatura alta/baixa: Set high and low temperature thresholds. An alarm will sound if the measured temperature exceeds or falls below these limits. (Specific setting instructions may vary, refer to on-screen prompts).
7. Manteniment
7.1. Neteja de la lent
- Use clean compressed air to blow away any loose contaminants.
- Gently wipe away small residues with a damp bastonet de cotó.
- Carefully wipe the surface with a damp tela de cotó.
- Do NOT use any solvents to clean the plastic lens.
7.2. Neteja de la Casing
Netegeu el termòmetre casing amb anunciamp sponge or soft cloth using mild soap and water.
Warning: Do NOT immerse the thermometer in water.
8. Solució De Problemes
- No display or low battery indicator: Replace the batteries with new 1.5V AAA batteries.
- Lectures inexactes:
- Assegureu-vos que la lent estigui neta i lliure d'obstruccions.
- Check the emissivity setting (if adjustable) and adjust it according to the material being measured.
- Allow the device to stabilize for 30 minutes if moved between environments with significant temperature changes.
- Ensure the D:S ratio is appropriate for your measurement distance.
- El làser no funciona: Check if the laser is enabled via the UP/Laser button.
- El dispositiu no s'encén: Check battery installation and charge.
9. Garantia i Suport
For warranty information or technical support, please contact your seller or the manufacturer directly. Keep your purchase receipt as proof of purchase.
