This document describes the A&D HL-WP Series Digital Scale, a precision weighing instrument available in several models: HL-1000WP, HL-300WP, HL-3000WP, and HL-3000LWP. The scale is designed for various weighing applications and incorporates features for accuracy, ease of use, and durability, including IP65 protection for resistance against water jets and dust.
Function Description:
The HL-WP series digital scale is used for accurately measuring the weight of objects. It features a weighing platform where items are placed for measurement. The scale displays the weight on a liquid crystal display, which can show readings in multiple units depending on the model (grams, pounds, ounces, or pounds-ounces). Key functions include turning the scale on/off, re-zeroing the display (to set the display to zero or subtract the weight of a container for tare weighing), and changing weighing units (for U.S.A. models). The scale also includes an automatic power-off function to conserve battery life, which can be enabled or disabled. Calibration is a critical function to ensure accurate measurements, and the scale supports both zero and span calibration using a calibration weight, as well as gravity compensation for adjusting to different geographical locations.
Important Technical Specifications:
The HL-WP series offers different capacities and resolutions across its models:
- HL-1000WP:
- Capacity: 1000 x 0.5 g (2.2 x 0.001 lb, 35.28 x 0.02 oz, 2 lb 3.3 x 0.1 oz)
- Non-linearity: ±1g
- Repeatability: 0.5g
- Calibration Weight: 1000g ± 0.1g
- HL-300WP:
- Capacity: 300 x 0.1 g (10.58 x 0.01 oz)
- Non-linearity: ±0.2g
- Repeatability: 0.1g
- Calibration Weight: 300g ± 0.02g
- HL-3000WP / HL-3000LWP:
- Capacity: 3000 x 1 g (6.6 x 0.002 lb, 105.8 x 0.1 oz, 6 lb 9.8 x 0.1 oz)
- Non-linearity: ±2g
- Repeatability: 1g
- Calibration Weight: 3000g ± 0.2g
Common specifications across the series include:
- Span drift: ±0.015% / °C TYP (5°C~35°C / 41°F~95°F)
- Operating temperature: -10°C~40°C / 14°F~104°F, Less than 85%RH
- Display: 13 mm / 0.51 inches, 7-segment liquid crystal display
- Display update: Approximately 10 times per second
- Power: 6 x R6P / LR6 / “AA” size batteries or AC adapter (optional).
- Battery life: Approximately 100 hours with manganese type, 200 hours with alkaline cells at 20°C / 68°F.
- Platform size:
- HL-1000WP / HL-300WP: 128 (W) x 128 (D) mm (5.0 (W) x 5.0 (D) in.)
- HL-3000WP / HL-3000LWP: 174(W)x137(D) mm (6.8(W)x5.4(D) in.)
- Dimensions:
- HL-1000WP / HL-300WP: 170 (W) x 219 (D) x 63 (H) mm (6.7 (W) x 8.6 (D) x 2.5 (H) in.)
- HL-3000WP / HL-3000LWP: 174(W)x219(D)x63(H) mm (6.8(W)x8.6(D)x2.5(H) in.)
- Weight (approx.):
- HL-1000WP / HL-300WP: 870 g / 1.9 lb
- HL-3000WP / HL-3000LWP: 950 g / 2.1 lb
- IP Code: IP65 (Protected against water jets and dust-tight) when used with batteries. Note: When used with an AC adapter, the scale does not conform to IP65.
Usage Features:
- User Interface: The scale features an ON/OFF key for power control, a RE-ZERO key for zeroing and tare functions, and a UNITS key (on U.S.A. models) for changing weighing units.
- Display Indicators: The display includes indicators for STABLE (when reading is stable), NET (when tare function is used), ZERO (when scale zero is correct), and Polarity.
- Leveling: A spirit level and four leveling feet are provided to ensure the scale is perfectly level for accurate weighing.
- Weighing Modes: Supports direct weighing and tare weighing (using a container).
- Unit Selection: U.S.A. models allow selection between grams, pounds, ounces, and pounds-ounces. The power-up unit can be changed by holding the UNITS key while turning the scale on.
- Error Messages: The display provides error messages such as "E" for overload, "----" for scale zero out of range, and "L6" for low battery.
- Automatic Power-Off: The scale automatically turns off after approximately 5 minutes of inactivity if the stable indicator is displayed, a feature that can be toggled on or off.
Maintenance Features:
- Battery Installation: The scale operates on six R6P / LR6 / AA size batteries. Instructions are provided for careful battery replacement, ensuring correct polarity and secure locking of the battery cover.
- AC Adapter (Optional): An optional AC adapter can be used for continuous power. It plugs into a socket inside the battery compartment. It's important to note that IP65 protection is not maintained when using the AC adapter.
- Calibration: Regular calibration is recommended, especially upon initial installation, after moving the scale a substantial distance, or as per local regulations. The manual details a step-by-step process for zero and span calibration using a calibration weight.
- Gravity Compensation: For enhanced accuracy in different geographical locations, the scale allows for gravity compensation. This involves adjusting a stored gravity acceleration value based on the scale's location, which can be found using the provided "Value of Gravity at Various Locations" table and "World Map."
- Environmental Considerations: Users are advised to avoid installing the scale in direct sunlight to prevent discoloration or malfunctions. The scale should be placed on a firm, level weighing table.
- Battery Care: If the scale is not to be used for a long period, batteries should be removed to prevent leakage.
- Overload Protection: Users are cautioned against overloading the scale, which could cause damage.
- Handling: The weighing pan should not be used to move the scale, as this could cause damage.
- Internal Service: Internal service or adjustments should only be performed by a qualified person.
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