valutazioni - 2, GPA: 3.5
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Facilità d'uso
. There are 4 models in each series, with capacities up to 30 kg. They all have stainless steel weighing platforms on an ABS base assembly. All the keypads are sealed, color coded membrane switches and the displays are large easy to read liquid crystal type displays (LCD). The LCD’s are supplied with a backlight. All units include automatic zero tracking, audible alarm for pre-set weights, automatic tare, pre-set tare and an accumulation facility that allows the count to be stored and recalled as an accumulated total. - 1 - QHW digital weighing scales user’s guide SECTION 2 SPECIFICATIONS QHW SERIES Model # QHW 3 QHW 6 QHW 15 QHW 30 Maximum Capacity 3kg 6kg 15kg 30kg Readability 0.1g 0.2 0.5 1g Resolution 1:30000 1:30000 1:30000 1:30000 Tare Range -3kg -6kg -10kg -30kg Minimum Capacity 2g 4g 10g 20g Repeatability (Std Dev) 0.1 0.2 0.5g 1g Linearity ± 0.2g 0.4 1g 2g Units of Measure kg, g, Lb., oz. Common Specifications Interface RS-232 Output Optional Stabilisation Time 2 Seconds typical Operating Temperature 0°C - 40°C / 32°F - 104°F Power supply (external) 115 / 230 Vac, 50/60Hz, 10 watts Calibration Automatic External Display 6 digits LCD digital display Draft shield N/A Balance Housing ABS Plastic, Stainless Steel platform Pan Size 225 x 300mm / 8.9 x 11.8” Overall Dimensions (wxdxh) 320 x 340 x 125mm / 12.6 x 13.4 x 4.9” Gross Weight 3.8kg/8.4lb Applications General Purpose Scale Functions Weighing, parts counting, % weight, Check weighing, Other Features and Specs Internal rechargeable battery (~70 hours operation) - 2 - SECTION 3 INSTALLATION 3.1 GENERAL INSTALLATION The scales should be sited in a location that will not degrade the accuracy. Avoid extremes of temperature. Do not place in direct sunlight or near air conditioning vents. Avoid unsuitable tables. The tables or floor must be rigid and not vibrate. Do not place near vibrating machinery. Avoid unstable power sources. Do not use near large users of electricity such as welding equipment or large motors. Avoid high humidity that might cause condensation. Avoid direct contact with water. Do not spray or immerse the scales in water. Avoid air movement such as from fans or opening doors. Do not place near open windows. Keep the scales clean. Do not stack material on the scales when they are not in use. 3.2 INSTALLATION of QHW SERIES The QHW Series comes with a stainless steel platform packed separately. Place the platform in the locating holes on the top cover. Do not press with excessive force as this could damage the load cell inside. Level the scale by adjusting the four feet. The scale should be adjusted such that the bubble in the spirit level is in the centre of the level and the scale is supported by all four feet, If the scale rocks readjust the feet. Attach the mains cable to the connector on the bottom of the scale. The power switch is located on the base near the front of the scale. - 3 - SECTION 5 DISPLAYS The LCD display will show a value and a unit to the right of the digits. In addition there are labels for TARE, GROSS weight, ZERO and for Low battery Low Battery Symbol Stability Symbol Parts Counting Units 888888OK HI LO GROSS TARE ZERO g/pcs oz % tkglb Checkweighing Symbols Weighing Units - 5 - QHW digital weighing scales user’s guide SECTION 6 OPERATION 6.1 ZEROING THE DISPLAY You can press the ZERO/ENTER key at any time to set the zero point from which all other weighing and counting is measured, within 4% of power up zero. This will usually only be necessary when the platform is empty. When the zero point is obtained the display will show the indicator for zero. The scale has an automatic rezeroing function to account for minor drifting or accumulation of material on the platform. However you may need to press the ZERO/ENTER key to rezero the scale if small amounts of weight are shown when the platform is empty. 6.2 TARING Zero the scale by pressing the ZERO/ENTER key if necessary. The zero indicator will be on. Place a container on the platform, a value for its weight will be displayed. Press the TARE key to tare the scale. The weight that was displayed is stored as the tare value and that value is subtracted from the display, leaving zero on the display. The "TARE" indicator will be on. As product is added only the weight of the product will be shown. The scale could be tared a second time if another type of product was to be added to the first one. Again only the weight that is added after taring will be displayed. When the container is removed a negative value will be shown. If the scale was tared just before removing the container this value is the gross weight of the container plus all product that was removed. The zero indicator will also be on because the platform is back to the same condition it was when the ZERO/ENTER key was last pressed. 6.3 WEIGHING A SAMPLE To determine the weight of a sample first tare...
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