Semi-micro Analytical Balance SEM Series
Semi-micro analytical balance reading to 0.01 mg, in three capacities: 120 g single range, or 120 g / 51 g and 210 g / 82 g dual range.
Glass draft shield, separate LCD display unit, RS232 interface and automatic calibration.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- 3 selectable configurations
- SKU family
- BIO-0354
- Shipping box
- 62.5 × 46.5 × 57 cm
- Ordering
- Online checkout and quote request available
- Category
- Balances
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The Semi-micro Analytical Balance SEM Series weighs to 0.01 mg. It uses a high-sensitivity, high-stability electromagnetic force sensor, a transparent glass draft shield and a display unit that sits apart from the weighing unit. It comes in three capacities:
- 120 g x 0.01 mg: one range. Repeatability and linearity ±0.02 mg; stabilization 6 s on average.
- 120 g x 0.1 mg / 51 g x 0.01 mg: dual range. Repeatability and linearity ±0.1 mg / ±0.02 mg; stabilization 2.5 s / 6 s on average.
- 210 g x 0.1 mg / 82 g x 0.01 mg: dual range. Repeatability and linearity ±0.1 mg / ±0.02 mg; stabilization 2.5 s / 6 s on average.
All three have a Ø90 mm pan, measure 470 × 310 × 320 mm (L × W × H) and weigh 12 kg. They are specified for 18–23 °C and 20–80% RH, with a balance (warm-up) time of 30–60 min. Power supply: AC 220 V, 50/60 Hz as standard, or AC 110 V, 50/60 Hz as an option; output power DC 12 V, 2 A.
Features
- Transparent glass draft shield: the sample can be seen from several directions.
- LCD display.
- Split design: the display unit and the weighing unit are separate.
- Digital processing, optimized for weighing small added amounts of sample.
- Built-in RS232 interface for a computer or a micro printer.
- Automatic calibration system.
- Weighing functions: basic weighing, piece counting and percentage weighing.
Used in scientific research, education, metallurgy, agriculture and other fields.
How It Works
The SEM Series balance operates on electromagnetic force restoration principles, where an electromagnetic coil generates a force to counteract the gravitational force acting on the sample. When a sample is placed on the weighing pan, the resulting displacement is detected by a position sensor. The control system adjusts current through the electromagnetic coil to restore the pan to its null position, with the required current being proportional to the sample mass.
An automatic calibration system keeps the balance calibrated, and digital processing optimizes weighing when small amounts of sample are added. Readings settle in 6 seconds on average at 0.01mg readability, and in 2.5 seconds at 0.1mg on the dual-range models. The balance is specified for 18-23°C and 20-80% relative humidity.
The single-range model reads 0.01mg across its full 120g capacity. The dual-range models read 0.1mg up to 120g or 210g and 0.01mg up to 51g or 82g, with ±0.02mg repeatability at 0.01mg readability.
Features & Benefits
Research identifier
This ID comes from the NCI Thesaurus (NCIT). Use it in data records and methods sections.
- Device type
- Analytical balance
NCIT:C80370
Readability
- 0.01 mg (120 g model)
- 0.1 mg / 0.01 mg (120 g / 51 g and 210 g / 82 g models)
Repeatability
- ±0.02 mg (120 g model)
- ±0.1 mg / ±0.02 mg (120 g / 51 g and 210 g / 82 g models)
Linearity
- ±0.02 mg (120 g model)
- ±0.1 mg / ±0.02 mg (120 g / 51 g and 210 g / 82 g models)
Stabilization Time
- 6 s average (120 g model)
- 2.5 s / 6 s average (120 g / 51 g and 210 g / 82 g models)
Operating Temperature
- 18–23 °C
Operating Humidity
- 20–80% RH
Balance Time (Warm-up)
- 30–60 min
Pan Size
- Ø90 mm
Power Supply
- AC 220 V, 50/60 Hz (standard)
- AC 110 V, 50/60 Hz (optional)
Output Power
- DC 12 V, 2 A
External Size (L x W x H)
- 470 × 310 × 320 mm
Net Weight
- 12 kg
Display
- LCD
Interface
- RS232 (computer, micro printer)
Calibration
- Automatic calibration system
Weighing Functions
- Basic weighing
- Piece counting
- Percentage weighing
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Clinical Diagnostics
- Environmental Monitoring
- Food Science
- Materials Science
- Pharmaceutical QC
Automation Level
- manual
Shipping weight
- 30.86 lb
Shipping box
- L: 62.5 cm
- W: 46.5 cm
- H: 57 cm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Resolution | 0.01mg resolution | Entry-level analytical balances often provide 0.1mg resolution | Enables precise measurement of smaller sample quantities and better accuracy in dilution preparation |
| Repeatability | ±0.02mg repeatability at 0.01mg readability | Standard analytical balances may offer ±0.1mg repeatability | Provides more consistent results for critical quantitative analysis and reduces measurement uncertainty |
| Stabilization Time | 6 seconds average at 0.01mg; 2.5 seconds at 0.1mg on dual-range models | Basic models often require 10-15 seconds for stabilization | Increases laboratory throughput and reduces waiting time during routine weighing operations |
| Capacity Range | 120g, 120g / 51g or 210g / 82g | Semi-micro balances typically offer 100-200g capacity | Accommodates both small analytical samples and larger preparation quantities in a single instrument |
| Environmental Tolerance | 18-23°C operating temperature, 20-80% humidity | Basic balances may have wider but less controlled operating ranges | Specified narrow range ensures consistent accuracy in controlled laboratory environments |
The SEM Series balance provides sub-milligram resolution with rapid stabilization for laboratories requiring precision weighing capabilities. Three capacities, 120g single range or 120g / 51g and 210g / 82g dual range, cover diverse sample sizes with ±0.02mg repeatability at 0.01mg readability. Controlled environmental specifications ensure consistent accuracy for quantitative analytical work.
| Model | SKU | Listed price | Status | Shipping box |
|---|---|---|---|---|
| 120 g x 0.01 mg | BIO-0354-120G | $3,963.99 | Available | 62.5 × 46.5 × 57 cm |
| 120 g x 0.1 mg / 51 g x 0.01 mg | BIO-0354-120G-51G | $2,699.99 | Available | 62.5 × 46.5 × 57 cm |
| 210 g x 0.1 mg / 82 g x 0.01 mg | BIO-0354-210G-82G | $3,388.99 | Available | 62.5 × 46.5 × 57 cm |
Practical Tips
Perform calibration using certified reference weights that span your typical working range, not just at full capacity.
Why: Ensures accuracy across the measurement range you actually use in daily operations.
Clean the weighing pan and chamber regularly with appropriate solvents, avoiding moisture contact with electronic components.
Why: Prevents contamination buildup that can affect measurement accuracy and electromagnetic field uniformity.
Allow samples to equilibrate to room temperature before weighing, especially when transferring from refrigerated storage.
Why: Temperature differences create air currents that interfere with the balance's ability to achieve stable readings.
If readings drift or fail to stabilize, check for air currents and ensure the balance is properly leveled.
Why: Environmental disturbances are the most common cause of measurement instability in precision balances.
Record environmental conditions (temperature, humidity) along with weighing data for critical measurements.
Why: Enables assessment of measurement uncertainty and provides documentation for quality assurance protocols.
Use anti-static measures when weighing hygroscopic or electrostatically sensitive materials.
Why: Static charges can cause erratic readings and sample adhesion to the weighing pan or chamber surfaces.
Center samples on the weighing pan and use minimal container mass to maximize effective capacity.
Why: Off-center loading can introduce measurement errors due to electromagnetic field non-uniformity.
Schedule the 30-60 minute warm-up period as part of daily laboratory startup procedures.
Why: Thermal equilibrium is essential for achieving the specified ±0.02mg repeatability performance.
Setup Guide
What’s in the Box
- Semi-micro Analytical Balance SEM Series main unit
- DC 12V 2A power adapter
- Weighing pan and draft shield assembly (typical)
- User manual and calibration documentation (typical)
- Anti-vibration pad (typical)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship. Technical support includes calibration guidance and troubleshooting assistance for optimal balance performance.
Compliance
What is the minimum sample size that can be accurately weighed on this balance?
With 0.01mg resolution and ±0.02mg repeatability, samples of 0.1mg or greater can be weighed with acceptable uncertainty for most analytical applications.
How long does the balance require for stabilization between measurements?
Readings stabilize in 6 seconds on average at 0.01mg readability, and in 2.5 seconds at 0.1mg on the dual-range models; actual time may vary with sample mass and environmental conditions.
What environmental conditions are required for optimal performance?
Operate within 18-23°C temperature range and 20-80% relative humidity, away from vibrations, air currents, and heat sources.
Can this balance be used for moisture analysis or loss-on-drying applications?
While the balance provides the necessary precision for gravimetric analysis, moisture determination requires heating capability not included in this model.
How often should the balance be calibrated?
Calibration frequency depends on usage and laboratory protocols, typically daily for critical applications or weekly for routine work, using certified reference weights.
What is the maximum weighing pan size that fits this balance?
The balance accommodates the included 90mm diameter pan; larger pans may affect accuracy due to air current sensitivity and electromagnetic field distribution.
Does the balance store weighing data or connect to LIMS systems?
A built-in RS232 interface connects the balance to a computer or a micro printer.
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