Benetech GM900 Manuals

MODEL: GM900 Infrared thermometer Instruction manual A. 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 consist of Optics, Temperature Sensor Signal amplifier, Processing circuit and LCD Display. The Optics collected the infrared energy emitted by object and focus onto the Sensor. Then the sensor translates the energy into an electricity signal. This signal will be turned out to be digital shown on the LCD after the signal amplifier and processing circuit. B. Warning & Cautions 1. Warning: To avoid the potential situation may cause harm or damage to people, please pay attention to the following items: 1) Before you use this unit, check on the plastic housing carefully. If there is any damage, do not use it 2) Do not point laser directly at eye or indirectly off reflective surfaces. 3) Do not use this unit in the environment of explosive gas, steam or dusty. 2. Caution: To avoid the damage of the unit or the target, please protect from the following situations: 1) EMF (electro-magnetic fields) from arc welders, or induction heaters. 2) Thermal shock caused by high temperature changes allow 30 minutes for unit to stabilize before use. 3) Do not leave the unit on or near objects of high temperature 2) Field of view: Make sure the target is larger than the unit's spot size. The smaller the target the closer measure distance. When accuracy is critical, make sure the ta get is at least twice as large as the spot size. (Page 1) (Page 2) (Page 3) C. Distance to Spot size 1) When take measurement, pay attention to the D stance to 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. D. Emissivity Emissivity, Most organic materials and painted or oxidized surfaces have an emissivity of 0.95 (pre-set in the unit). Inaccurate readings will result from measuring shiny or polished metal surfaces. To compensate, cover the target surface with masking tape or flat black paint. Measure the tape or painted surface when the tape or painted reach the same temperature as the material underneath. Material Emissivity Material Emissivity Aluminum 0.3 Iron 0.70 Asbestos 0.95 Lead 0.5 Asphalt 0.95 Limestone 0.98 Basalt 0.70 Oil 0.94 Brass 0.5 Paint 0.93 Brick 0.90 Paper 0.95 Carbon 0.85 Plastic 0.95 Ceramic 0.95 Rubber 0.95 Concrete 0.95 Sand 0.90 Copper 0.95 Skin 0.98 Dirt 0.94 Snow 0.90 Frozen food 0.90 Steel 0.80 Hot food 0.93 Textiles 0.94 Glass(Plate) 0.85 Water 0.93 Ice 0.98 Wood 0..94 www.Tools.in.th www.Tools.in.th