Benetech GM 550 Infrared Thermometer

Introduction

A pyrometer is a non-contact thermometer used for quick, safe, and contactless measurement of temperature on the surface of dangerous, hot, or hard-to-reach objects.

The principle of operation is as follows: Every object emits infrared (thermal) radiation, which can be felt, for example, when bringing your hand close to a hot iron. The intensity of this radiation increases with the object's temperature. The pyrometer measures the intensity of infrared radiation reaching its lens. The measured radiation value is converted into the corresponding object temperature, which is then displayed on the pyrometer.

Safety of Use

The device has been designed and manufactured with the utmost care for the safety of users. To ensure work safety, follow all instructions in this manual.

Before using the pyrometer, conduct a thorough inspection. If any damage is found (e.g., to its plastic casing), do not use the device.

The pyrometer should not be used in the presence of explosive substances, gases, water vapor, or dust.

Do not point the laser at eyes or indirectly at reflective surfaces.

The device has undergone mandatory conformity assessment and meets the essential requirements of the New Approach European Directives. The product is marked with the [CE marking].

Notes

Ensure safe operating conditions for the device. Any user modifications to the device may cause it to malfunction.

The device may be damaged if exposed to electromagnetic fields or used near welding machines or induction heaters.

In case of large/sudden ambient temperature changes (thermal shock), leave the pyrometer for approximately 30 minutes to stabilize before use. Also, do not leave the pyrometer near high-temperature objects.

The pyrometer is not waterproof. Using it in rooms with very high humidity or immersing it in liquid will cause damage.

Device Structure and Functions

Device Structure

The pyrometer consists of optics, a temperature sensor, a signal amplifier, a processing unit, and an LCD display.

Operation

The optics collect infrared energy emitted by the object and focus it onto the sensor, which then converts it into an electrical signal. This signal is digitally displayed on the screen after processing.

Display

The LCD display shows the following icons/information:

• a. HOLD: Measurement completed
• b. SCAN: Scanning
• c. Laser indicator
• d. Backlight
• e. Battery level
• f. °C / °F: Temperature unit
• g. 26.5: Temperature reading

Buttons

1. Trigger: Pressing the trigger activates the SCAN icon on the LCD. Upon release, the device displays the result for approximately 7 seconds before the screen turns off. The auto-off function automatically switches off the device to save battery.

2. Laser On/Off Button

3. Celsius / Fahrenheit Unit Change Button

4. Backlight On/Off Button: Any operation activates the backlight for 7 seconds.

Device Operation

Measurement Distance

Diagram Description: A diagram illustrates the relationship between distance (D) and spot size (S) with a ratio of D:S=12:1. It shows measurement points at different distances (38mm/1.5" at 300mm, 75mm/3.0" at 900mm, 132mm/5.3" at 1500mm).

1. When taking a measurement, remember that as the distance D increases, the area of the measured surface S also increases. The distance-to-surface ratio is 12:1.

2. For accurate measurement, the pyrometer's field of view must not extend beyond the object whose temperature is being measured. Otherwise, the pyrometer will collect radiation not only from the object but also from the surrounding environment (background), leading to an incorrect measurement result. Therefore, ensure the target is larger than the measurement spot. The closer the distance, the more centered the target. For optimal accuracy, ensure the target is at least twice the size of the spot.

Emissivity Coefficient

Materials vary in their ability to emit infrared radiation from their surface. This property depends on factors such as surface smoothness and color. Matte and dark surfaces emit infrared radiation better than smooth and bright surfaces.

Most organic materials and painted or oxidized surfaces have an emissivity of 0.95 (factory default). Measurements on shiny or polished metal surfaces may negatively affect reading accuracy. To reduce potential errors during measurement, cover the target surface with masking tape or paint it thinly with black paint. Measurements should be taken on the tape/painted surface after it has reached the same temperature as the material underneath.

How to Use

Press the trigger to turn on the device. While holding the trigger, start the measurement by pointing the pyrometer away from the object. Then, aim the device at the target object and scan the target surface by moving up and down until you locate the area whose temperature you need to measure. After releasing the trigger, the pyrometer will display the result for 7 seconds before the screen turns off.

Diagram Description: A diagram shows the trigger and the ergonomic grip. Another diagram shows the device being aimed at a radiator, with the laser dot visible on the surface.

This device is equipped with a laser, which is used solely for aiming.

Power Supply

The pyrometer should be powered by a 9V 6F22 battery (alkaline or NiCd).

Maintenance

Lens Cleaning: Loose debris can be removed with compressed air. Remaining dirt should be gently cleaned with a damp cotton swab.

Casing Cleaning: The casing can be cleaned with a damp cloth/sponge using mild soap.

Specifications

Information for Users on Disposal of Electrical and Electronic Equipment

Diagram Description: The symbol shown on products or accompanying documentation indicates that faulty electrical or electronic equipment should not be disposed of with household waste. [WEEE symbol]

Proper disposal, reuse, or recovery of components involves handing over the device to a specialized collection point, where it will be accepted free of charge. In some countries, the product can be returned to a local distributor when purchasing a new device. Proper disposal of the device helps conserve valuable resources and avoid negative impacts on health and the environment, which could be endangered by improper waste handling. Detailed information about the nearest collection point can be obtained from local authorities. Improper waste disposal may be subject to penalties under relevant local regulations.

If you need to dispose of electrical or electronic equipment, please contact your nearest point of sale or supplier for further information.

Instructions for Replacement and Safe Disposal of Used Batteries or Accumulators

ATTENTION!

Diagram Description: The crossed-out wheeled bin symbol on a battery or its packaging means that batteries should not be treated as ordinary household waste. As of June 12, 2009, regulations from April 24, 2009, on batteries and accumulators (Journal of Laws of 2009, No. 79, item 666) came into effect, limiting the negative environmental impact of batteries and accumulators by reducing the amount of hazardous substances in them and by organizing a selective collection system.

Diagram Description: Symbols [Mercury symbol] (Hg) and [Lead symbol] (Pb) indicate the presence of these substances if the battery contains more than 0.0005% mercury or 0.004% lead.

By properly disposing of batteries and accumulators, users contribute to preventing potentially negative consequences for the natural environment and human health that could arise from improper battery disposal. Recycling materials helps protect natural resources. Detailed information on battery recycling can be obtained from local government authorities, waste disposal companies, or the store where the product was purchased.

Instructions for Safe Battery Disposal:

• Open the battery compartment cover.
• Remove the batteries from the device.
• Store the removed batteries or accumulators at a designated collection point.

Despite all efforts, we cannot guarantee that the information published in this manual is error-free.