Semi-micro Analytical Balance SEM Series
Semi-micro analytical balance with 0.01mg resolution and 120g capacity, featuring ±0.02mg repeatability and 6-second stabilization for precision quantitative analysis.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Configured during quote
- SKU family
- BIO-0354
- Sizing
- 32.0 x 47.0 x 31.0 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 delivers precision weighing capabilities with 0.01mg resolution across a 120g capacity range. This electromagnetic force restoration balance operates within controlled environmental parameters (18-23°C, 20-80% RH) to achieve ±0.02mg repeatability with 6-second average stabilization time. The instrument features a 90mm diameter weighing pan and external dimensions of 470×310×320mm.
Designed for quantitative analysis requiring sub-milligram precision, this balance incorporates temperature and humidity monitoring to maintain measurement accuracy. The 30-60 minute warm-up period ensures thermal equilibrium before critical weighing operations. DC 12V 2A power supply provides stable operation for extended laboratory sessions.
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.
Internal calibration weights and temperature compensation algorithms maintain measurement accuracy across the specified operating range. The balance continuously monitors environmental conditions and applies corrections for temperature and humidity variations that could affect measurement precision. Digital signal processing filters mechanical vibrations and air currents to achieve the specified 6-second stabilization time.
The 0.01mg resolution is achieved through high-resolution analog-to-digital conversion and advanced filtering algorithms that distinguish genuine mass changes from environmental noise. The electromagnetic force restoration system provides linear response across the full 120g capacity range while maintaining sub-milligram repeatability.
Features & Benefits
Automation Level
- manual
BA1055SEM
- BA2085SEM
120g/51g
- 210g/82g
Repeat Ability
- ±0.02mg
±0.1mg/±0.02mg
- ±0.1mg/±0.02mg
Liner
- ±0.02mg
Operation Temp
- 18~23℃
Operating Humidity
- 20%~80%RH
Stable Time
- 6s(average)
BalanceTime
- 30~60min
Scale Size
- Φ90mm
Output Power
- DC12V 2A
External Size(L*W*H)
- 470*310*320mm
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Clinical Diagnostics
- Environmental Monitoring
- Food Science
- Materials Science
- Pharmaceutical QC
Capacity
- 120g
Accuracy
- 0.01mg
Weight
- 14.0 kg
Dimensions
- L: 32.0 mm
- W: 47.0 mm
- H: 31.0 mm
| 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 | 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 stabilization | Basic models often require 10-15 seconds for stabilization | Increases laboratory throughput and reduces waiting time during routine weighing operations |
| Capacity Range | 120g capacity | 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. The 120g capacity accommodates diverse sample sizes while maintaining ±0.02mg repeatability performance. Controlled environmental specifications ensure consistent accuracy for quantitative analytical work.
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?
The balance achieves stabilization in 6 seconds average, though actual time may vary depending on 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?
Consult product datasheet for data connectivity options and computer interface capabilities specific to your laboratory integration requirements.
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