Benetech GM550H Infrared Thermometer Instruction Manual

Benetech GM550H Infrared Thermometer

Introduction

• This infrared thermometer is used for measuring the temperature of the object’s surface, which is applicable for various hot, hazardous or hard-to-reach objects without contact safely and quickly.
• This unit consists of Optics, Temperature Sensor Signal amplifier, Processing circuit, and LCD Display. The Optics collected the infrared energy emitted by an object and focused onto the Sensor. Then the sensor translates the energy into an electricity signal. This signal will be turned out to be digitally shown on the LCD after the signal amplifier and processing circuit.

WARNING & CAUTIONS

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

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

Cautions
The infrared thermometer should be protected for the following:

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

Distance to spot size

1. When taking measurements, pay attention to the Distance to the Spot Size. As the Distance (D) from the target surface increases, the spot size (S) of the area measured by the unit becomes larger. The Distance to Spot size of the unit is 12:1. This unit is equipped with a laser, which is used for aiming.
2. Field of view: Make sure the target is larger than the unit’s spot size. The smaller the target the closer the measure distance. When accuracy is critical, make sure the target is at least twice as large as the spot size.

EMISSIVITY

Emissivity: Most organic materials and painted or oxidized surfaces have an emissivity of 0.95(preset in the unit). Inaccurate readings will 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 the tape or painted reaches the same temperature as the material underneath.

Operation

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 be shown on the LCD.

This unit is equipped with a laser, which is only used for aiming.

Locating a Hot Spot
To find a hot spot, aim the thermometer outside of interest, then scan across with an up and down motion until you locate the hot spot. (Figure 1)

LCD display & buttons

LCD display

• A: Measuring reading
• B: Measuring unit
• C: Low-temperature alarm icon
• D: Data hold icon
• E: Scanning icon
• F: High-temperature alarm icon
• G: Laser on icon
• H: Battery power icon
• I: Mode
• J: Emissivity indicator
• K: Functional value

Diagram description

1. Trigger: press it to display the temperature value with SCAN appearing in the meantime. Release the trigger and enter into HOLD mode to save the data automatically, and the unit turns off automatically if there is no further operation.
2. Laser positioning: press the trigger and then press the “ ” key to turn on/off the laser positioning function with an icon displaying on the LCD.
3. Temperature unit shift: press the “ ” key to shift the temperature unit between Celsius and Fahrenheit.
4. Press the SET key and MAX-AVG-MIN-DIF-LALHAL- OFFSET-E will be displayed on the LCD in sequence repeatedly, press the SET key again to select the desired function. This device has a memory function; the measuring mode will be displayed next time after turning it on.

• MAX: measuring maximum temperature
• MIN: measuring minimum temperature
• DIF: figure out the difference between the MAX and MIN
• AVG: measuring average temperature
• HAL: high-temperature alarm–When selecting HAL, press “ ” key and “ ” key to set the high-temperature alarm trigger and confirm by pressing the 5 key. When reading over the trigger, LCD displays HI icon with BiBi audio sounds. The alarm works in other function modes as well.
• LAL: low-temperature alarm–when selecting LAL, press “ ” key and “ ” key to set the low-temperature alarm trigger and confirm by pressing the 5 key. When reading over the trigger, LCD displays a LOW icon with BiBi audio sounds. The alarm works in other function modes as well.
• OFFSET: Zero offset adjustment
• E: Press the EMS key and then press “ the” key and “ key to set up the emissivity, and then press the EMS key to confirm the selected.

Maintenance

Lens Cleaning
Blow off loose particles using clean compressed air. Gently brush the remaining debris away with a moist cotton swab. The swab may be moistened with water.
Case cleaning: Clean the case with a damp sponge/ cloth and mild soap.

Note

1. Do not use solvent to clean plastic lenses.
2. Do not submerge the unit in water.

Specification

Accuracy

| >0℃(32℉):±2℃(±3.6℉) or ±2%

<0℃ (32℉):±3℃ (±5℉)

Whichever is greater

Resolution| 0.1℃ or 0.1℉
Repeatability| 1% of reading or 1℃
Response time| 500 mSec, 95% response
Spectral response| 5-14 μm
Emissivity| 0.10~1.00 Adjustable (0.95 Preset)
Distance to Spot size| 12:1
Operating Temperature| 0 ~40℃ (32 ~ 104℉)
Operating Humidity| 10~95%RH non-condensing， up to 30℃(86℉)
Storage Temperature| -20 ~ 60℃ (-4~140℉)
Power| 9V Alkaline or NiCd battery
Typical battery life

(Alkaline)

| Non-laser mode: 22 hrs; Laser Models:12 hrs
Weight| 147.5g
Dimension| 15310143mm

Specific Declarations

• Our company shall hold no any responsibility resulting from using output from this product as direct or indirect evidence.
• We reserve the right to modify product design and specifications without notice.

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