QHW series Digital Weighing Scales User’s guide UGQHW-E0204
Contents SECTION 1 INTRODUCTION………………………………………………………………1 SECTION 2 SPECIFICATIONS……………………………………………………..……2 SECTION 3 INSTALLATION……………………………………………………..……….3 3.1 General Installation……………………………………………………………………3 3.2 Install of QHW series…………………………………………………………..………3 SECTION 4 KEY DESCRIPTIONS………………………………………………………4 SECTION 5 DISPLAYS………………………………………………………………….5 SECTION 6 OPERATION…………………………………………………………….…..6 6.1 Zeroing the display…………………………………………………………………….6 6.2 Taring……………………………………………………………………………..…….6 6.
SECTION 1 INTRODUCTION The QHW series of scales provides an accurate, fast and versatile series of general purpose weighing scales with counting, % weighing and check-weighing functions. 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.
QHW digital weighing scales user’s guide SECTION 2 SPECIFICATIONS QHW SERIES Model # Maximum Capacity Readability Resolution Tare Range Minimum Capacity Repeatability (Std Dev) Linearity ± Units of Measure QHW 3 3kg 0.1g 1:30000 -3kg 2g 0.1 0.2g QHW 15 QHW 6 6kg 15kg 0.2 0.5 1:30000 1:30000 -6kg -10kg 4g 10g 0.2 0.5g 0.4 1g kg, g, Lb., oz.
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.
QHW digital weighing scales user’s guide SECTION 4 KEY DESCRIPTIONS Zero or Set the zero point for all subsequent weighing. The display shows zero. A secondary function , of "Enter" key when setting parameters or other functions. Tare or Tares the scale. Stores the current weight in memory as a tare value, subtracts the tare value from the weight and shows the results. This is the net weight. Entering a value using the keypad will store that value as the tare value.
SECTION 5 DISPLAYS The LCD display will show a value and a unit to the right of the digits.
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.
of weight will cause the display to jump to 102.13% as one scale division (0.5g) increase to 24.0g will be equivalent to a 2.13% increase. Removing the 350g weight and putting a 300g weight on the scale the display will show 85.71% as 300g is 85.71% of 350g. Pressing the FUNC key will return the scale to weighing. 6.5 PARTS COUNTING When the scale is showing weight, counting function.
QHW digital weighing scales user’s guide BOTH LIMITS SET The display will show OK and the beeper will sound when the weight is between the limits. LOW LIMIT SET, HIGH LIMIT is set to zero The display will show OK and the beeper will sound when the weight is less than the Low Limit. Above the Low Limit the display will show HIGH and the beeper will be off. HIGH LIMIT SET, LOW LIMIT is set to zero The display will show LOW and the beeper will be off when the weight is less than the High Limit.
6.9 AUTOMATIC ACCUMULATION When the scale has been set to Automatic Accumulation the value is stored in memory automatically. Add a weight to the scale, the beeper will sound when the scale is stable to signify the value is accepted. Remove the weight. The display will show "ACC 1" and the totals in memory when the scale returns to zero. Adding a second weight will repeat the process. While the weight is on the scale it is permissible to press the PRINT key to store the value immediately.
QHW digital weighing scales user’s guide SECTION 7 BATTERY OPERATION The scales can be operated from the battery if desired. The battery life is approximately 100 hours. When the battery needs charging the arrow above the low battery symbol under the weight display will turn on. The battery should be charged as soon as the arrow above the symbol is on. The scale will still operate for about 10 hours after which it will automatically switch off to protect the battery.
SECTION 8 RS-232 OUTPUT The QHW Series of scales can be ordered with an optional RS-232 output. Specifications: RS-232 output of weighing data ASCII code 4800 Baud 8 data bits No Parity Connector: 9 pin d-subminiature socket Pin 2 Output Pin 3 Input, not used at this time Pin 5 Signal Ground Data Format for normal weighing operations, parts counting or recalling of totals from memory will all be different. Examples follow: Normal Output GS 1.234kg weight No.. Total 1.
QHW digital weighing scales user’s guide SECTION 9 PARAMETERS The scale has 6 parameters that can be set by the user. These allow the user to set the scale to: • Display the weight in other increments of weight to minimize the affects of vibration, wind or other environmental conditions. • Control the back light on the display. It may be necessary to turn the backlight off to maximize battery life. • Set the Accumulation to Automatic, manual or set the RS-232 interface to continuously print the weight.
SECTION 10 CALIBRATION 10.1 Linear calibrate To start calibration turn the scale off and then turn it back on. Press the limit and % keys together during the initial counting from 9 to 0 on the display. The display will show "unLoAd". Remove all weight from the pan and then press the ZERO/ENTER key to set the initial zero point. The display will then show the first calibration weight request. Put this weight on the platform and then press the ZERO/ENTER key when stable.
QHW digital weighing scales user’s guide SECTION 11 ERROR CODES During the initial power-on testing or during operation it is possible the scale may show an error message. The meaning of the error messages is described below. If an error message is shown repeat the procedure that caused the message, turning the balance on, calibration or other functions. If the error message still is shown then contact your dealer for further support.
