LG Electronics QHW 15, QHW 6, QHW 30, QHW 3 User Manual

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

6.3 Weighing a sample……………………………………………………………..…….6

6.4 Percent weighing………………………………………………………………..…….6

6.5 Parts counting……………………………………………………………………..…….7

6.6 Check-weighing………..………………………………………………………..…….7

6.7 Accumulated total………..………………………………………………………..…….8

6.8 Manual accumulation………..…………………………………………………..…….8

6.9 Automatic accumulation……..………………………………………………..…….9
SECTION 7 BATTERY OPERATION………………………………………………..…10
SECTION 8 RS-232 OUTPUT…………………………………………………………..11
SECTION 9 PARAMETERS……………………………………………………………12
SECTION 10 CALIBRATION……………………………………………………..……..13
SECTION 11 ERROR CODES…………………………………………………………15

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.

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.

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QHW digital weighing scales user’s guide

SECTION 2 SPECIFICATIONS

QHW SERIES

Model # QHW 3 QHW 6

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)

QHW 15 QHW 30

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