A&D ION Series BM-20 Micro Balance, 22 g x 0.001 mg, with RS-232C

Item #BM-20

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Calibration Method

Calibration ensures Regulatory and Audit Compliance

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  • Resolution of 1 µg (0.001 mg)

  • Built-in fanless static eliminator

  • Anti-static glass breeze break

  • Percentage and counting modes

  • Large weighing chamber

  • Automatic response adjustment

  • Automatic self calibration

  • RS-232C and WinCT Software standard

  • Quick USB interface

  • GLP/GMP/GCP/ISO compliant

  • AD-1688 Data Logger included


Weighing is at the heart of many laboratory processes and the Ion Series offers the features, performance and standard accessories to bring real convenience to your lab. With the six balances of the Ion Series, you can choose a capacity as high as 520 g or a micro-balance with readability down to 1 µg. The BM-20 and BM-22 let you handle with confidence even trace quantities of valuable or degradable substances.

Critical to precision weighing is static control, which is why the direct current fan-less ionizer is standard on all models

The automatic response adjustment function uses environmental data from built-in sensors to compensate the balance’s characteristics to deliver fast and stable results. Calibration is also automatic and always available with a single key press. A range of accessories add extra convenience.

Weighing Capacity 22 g
Minimum Weighing Value 0.001 mg
Repeatability (Standard Deviation) 0.0025 mg (for 1 g)
Linearity ±0.010 mg
Stabilization Time (set to FAST) Approximately 10 seconds
Sensitivity Drift (10°C to 30°C) ±2 ppm / °C (when automatic self calibration is not used)
Operating Temperature 5°C to 40°C (41°F to 104°F), 85% RH or less (non-condensing)
Display Refresh Rate 5 times/second or 10 times/second
Measurement Units (Display Mode) g, mg, oz, ozt, ct, momme, dwt, GN, tael, tola, messghal, pieces (counting mode), % (percent mode), specific gravity
Counting Mode Minimum unit mass = 0.1 mg / number of samples = 10, 25, 50 or 100 pieces
Percent Mode Minimum 100% ref. mass = 10.0 mg / minimum 100% display = 0.01%, 0.1%, 1% (depends on the reference mass stored)
Internal Memory 200 sets weighing data / 100 sets with date & time / 50 sets of calibration data
External Data Logger Store up to 5,000 weighing results with date & time to AD-1688 (standard)
Data Output GLP / GMP / GCP / ISO compliant. Outputs: balance manufacturer, model, s/n, balance identification number, data, time of calibration, mass used, and space for signature.
Standard Interface RS-232C, Quick USB, external key plug for optional foot switch (PN SW:128)
Internal Calibration Motor-driven internal calibration
External Calibration Masses (g) 20, 10, 5, 2, 1
Ionizer Electrode Pin Life Approximately 10,000 hours of continuous use (user replaceable)
Weighing Pan Diameter 25 mm (50 mm, 95 mm for weighing filters)
Power Consumption Approximately 30 VA (supplied by the AC adapter)
External Dimensions 259 W x 466 D x 326 H mm
Weight Approximately 10 kg
Standard Accessories AC adapter, instruction manual, WinCT (CD-ROM), Weighing Data Logger (AD-1688), long tweezers for calibration mass (AD-1689), standard tweezers, two filter weighing pans, microfuge holders and 3 sizes of disposable pans

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