BENETECH GM1651 Infrared Thermometer Instruction Manual

A. Introduction

This infrared thermometer is used for measuring the temperature of the object's surface. It is applicable for various hot, hazardous, or hard-to-reach objects without contact, safely and quickly.

The unit consists of Optics, Temperature Sensor, Signal amplifier, Processing circuit, and LCD Display. The Optics collect infrared energy emitted by the object and focus it onto the Sensor. The sensor translates the energy into an electrical signal, which is then converted to a digital display on the LCD after signal amplification and processing. Equipped with USB data export function, this product is a valuable tool for your work.

B. Warning & Cautions

1. Warning:

To avoid potential situations that may cause harm or damage to people, please pay attention to the following items:

• Do not point the laser directly at eyes or indirectly off reflective surfaces.
• The unit cannot measure through transparent surfaces such as glass or plastic. It will measure the surface temperature of these materials instead.
• Steam, dust, smoke, or other particles can prevent accurate measurement by obstructing the unit's optics.

2. Cautions:

The infrared thermometer should be protected from the following:

• EMF (electro-magnetic fields) from arc welders or induction heaters.
• Thermal shock (caused by large or abrupt ambient temperature changes; allow 30 minutes for the unit to stabilize before use).
• Do not leave the unit on or near objects of high temperature.

C. Distance to Spot Size

When taking measurements, pay attention to the Distance to Spot Size (D:S). As the distance (D) from the target surface increases, the spot size (S) of the measured area by the unit becomes larger.

The Distance to Spot size for this unit is 20:1. This unit is equipped with a laser, which is used for aiming.

Diagram illustrating the D/S targeting ratio. The diagram visually represents the relationship between the distance to the target (D) and the spot size (S). It shows example measurements such as a 18mm spot size at 300mm distance, and a 42mm spot size at 1500mm distance. The text clarifies that the unit's Distance to Spot size is 50:1 (as per specifications), and for critical accuracy, the target should be at least twice the spot size.

D. Emissivity

Emissivity: Most organic materials and painted or oxidized surfaces have an emissivity of 0.95 (preset in the unit). Inaccurate readings may result from measuring shiny or polished metal surfaces. To compensate for this, adjust the unit's emissivity reading or cover the surface to be measured with masking tape or flat black paint. Measure the tape or painted surface when it reaches the same temperature as the material underneath.

E. Operation

1. Operating the unit:

1. Open the battery door and insert a 9V battery properly.
2. Pull the trigger to turn on the unit.
3. Aim at the target surface and pull the trigger; the temperature will then be shown on the LCD. This unit is equipped with a laser, which is only used for aiming.

2. Locating a Hot Spot:

To find a hot spot, aim the thermometer outside the area of interest, then scan across with an up and down motion until you locate the hot spot. (See Figure 1 for visual aid).

F. LCD Display & Buttons

1. LCD Display:

• A: measuring reading
• B: measuring unit
• C: laser on icon [laser-icon]
• D: back light on icon [backlight-icon]
• E: battery power icon [battery-icon]
• F: scanning icon [scanning-icon]
• G: data hold icon [data-hold-icon]
• H: mode/emissivity indicator
• I: data storage / read icon [data-storage-icon]
• J: low temperature alarm icon [low-temp-alarm-icon]
• K: high temperature alarm icon [high-temp-alarm-icon]

2. Diagram Description:

Figure 2 shows the layout of the unit's buttons and LCD display.

Button Functions:

• Trigger: Full screen display lasts for one second after turning on. It then displays the reading with a SCAN icon. Releasing the trigger displays the reading with a HOLD icon. Built-in auto power off in 20 seconds.
• Laser/Back Light Button: When the backlight is on, any operation will keep the backlight on for 10 seconds. The LCD indicates the on/off status.
• Key Functions (Press 3 Key): The LCD sub-display blinks MAX-MIN-DIF-AVG-HAL-LAL-STO-EMS segments. The main display indicates the normal measuring mode. Press the 4 key to enter these modes:
  • a. MAX: Measuring maximum temperature.
  • b. MIN: Measuring minimum temperature.
  • c. DIF: Calculates the difference between the current reading and a previously stored reading (press 4 key to set the reference).
  • d. AVG: Displays the average value of all measurements taken in the last 2 seconds.
  • e. HAL: High temperature alarm. When HAL is selected, press the 5 key to set the high temperature alarm trigger. Confirm by pressing the 4 key. When the reading exceeds the trigger point, the LCD displays the HI icon with an audio alert [audio-alert].
  • f. LAL: Low temperature alarm. When LAL is selected, press the 5 key to set the low temperature alarm trigger. Confirm by pressing the 4 key. When the reading falls below the trigger point, the LCD displays the LOW icon with an audio alert [audio-alert].
  • g. STO: Data storage. When STO is selected, the LOCK and DATA & 1--- indicators will show when the 4 key is pressed. After taking a temperature reading, press the 6 key to store it; then the memory unit number (e.g., 2---) will be shown. There are 80 groups of memory available. To recall stored data in normal measuring mode, press the 6 key. To remove all data, press the 6 key for 3 seconds.
• EMS (Emissivity Setup): Press the 5 key for emissivity settings. Press the 4 key to save the setup and return to normal status.
• Celsius / Fahrenheit Switch: Please open the battery compartment and push the slide switch [temp-unit-switch] to convert between Celsius and Fahrenheit.

G. Maintenance

1. Lens Cleaning:

• Blow off loose particles using clean compressed air.
• Gently brush remaining debris away with a moist cotton swab. The swab may be moistened with water.

2. Case Cleaning:

• Clean the case with a damp sponge/cloth and mild soap.

Note:

• Do not use solvent to clean the plastic lens.
• Do not submerge the unit in water.

H. Specification

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