Laboratory balances | Precision balances | Fine balances
Our laboratory balances have been specially developed for use in scientific and industrial laboratories and are indispensable for the fields of chemistry, biology, pharmacy and food technology. They are characterised by their high accuracy, reliability and user-friendliness. With a wide range of capacities and readabilities, our laboratory balances are ideal for the precise measurement of materials such as chemicals, powders, liquids and other substances.Read more...
Stainless steel platform: ∅ 160 mm
Stainless steel platform: 140 x 150 mm
Stainless steel platform: ∅ 80 mm
Stainless steel platform: ∅ 110 mm
Stainless steel platform: ∅ 110 mm
Stainless steel platform: ∅ 160 mm
Stainless steel platform: 175x 195 mm
Stainless steel platform: 220 x 320 mm
Stainless steel platform: 350 x 400 mm, IP 65
Stainless steel platform: ‚àÖ 110 mm
Stainless steel platform: ‚àÖ 110 mm
Laboratory scales for various weighing applications
As the name "laboratory balance" already suggests, these are balances that are mainly used in the laboratory.
They can be divided into:
- Microbalances
- Analytical balances
- Precision balances
- Precision balances / Compact laboratory balances
With the help of analytical balances, solid and liquid substances can be examined and checked. Accuracies in the microgram range are not uncommon. With these special laboratory balances, even fine dust particles in the air or the density of liquids can be measured, for example. Microbalances with an accuracy of 0.001 mg (1µg) have a highly precise nominal load range over which the finest particles can be detected. Precision scales are often used in the industrial sector. Here the focus is - as the name suggests - on particular precision and accuracy. They are often used for quality assurance or for weighing masses up to 12 kg. When choosing a scale, make sure that the higher the nominal load range, the "coarser" the determined result. The scale interval defines the readability. Another important factor is repeatability or traceability. Precision scales can be divided into scales with internal and external calibration.
Precision scales can be divided into scales with internal and external calibration.
Precision scales with electromagnetic force compensation EM
| Analytical scales LB-MA |
Precision balance LB-MW |
Precision balance LB-MC |
Precision balance LB-MK |
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| Measuring principle | Electromagnetic force compensation | |||
| Adjustment | Internal calibration | |||
| Max (g) | 120 | 250 | 310 | 520 | 1.200 | 2.100 | 520 | 720 | 1.000 | 1.200 | 4.200 | 5.200 | 6.200 |
| Readability, (g) | 0,0001 | 0,001 => 1 mg | 0,001 => 1 mg | 0,01 |
| Loadplate (mm) | Ø 80 mm | Ø 110 mm | Ø 110 mm | Ø160 mm |
| Repeatability (g) | 0,0001 | 0,001 | 0,001 | 0,01 |
| Linearity (g) | ± 0,0003 | ± 0,002 | 0,003 | 0,005 | ± 0,002 | 0,002 | 0,003 | 0,003 | ± 0,03 |
| Settling time (sec.) | ≤ 4 | ≤ 2 | ≤ 3 | ≤ 3 | ≤ 2 | ≤ 2 | ≤ 3 | ≤ 3 | ≤ 2 | ≤ 3 | ≤ 3 |
Compact precision scales with external calibration and load cell technology
| Precision balance LB-SC |
Precision balance LB-SK |
Precision balance LB-SQ |
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| Measuring principle | Strain gauge load cell | ||
| Adjustment | External calibration | ||
| Max (g) | 210 | 310 | 420 | 1.000 | 2.200 | 3.200 | 4.200 | 3.200 | 5.200 | 6.500 |
| Readability, d (g) | 0,001 => 1 mg | 0,01 | 0,1 |
| Loadplate (mm) | Ø 80 | Ø 130 | 140 x 150 |
| Repeatability (g) |
0,001 | 0,01 | 0,05 |
| Linearity (g) | ± 0,003 | 0,003 | 0,004 | ± 0,03 | ± 0,2 |
| Settling time (sec.) | ≤ 3 | ≤ 3 | ≤ 2 |
High-load precision scales with external calibration
| Precision scales LB-MR |
Precision scales LB-LR |
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| Measuring principle | Electromagnetic force compensation | Strain gauge load cell |
| Adjustment | External calibration | |
| Max (g) | 6.200 | 8.200 | 10.100 | 12.100 | 8.000 | 16.000 | 25.000 | 32.000 |
| Readability, d (g) | 0,01 | 0,1 |
| Loadplate (mm) | 175 x 195 | 220 x 320 |
| Repeatability (g) | 0,01 | 0,1 |
| Linearity (g) | ± 0,03 | ± 0,03 |
| Settling time (sec.) | ≤ 4 | ≤ 3 |
What is the difference between internal and external calibration?
A scale with internal calibration has a calibration weight inside that can load the weighing cell via an electromechanical drive. Therefore, these scales are able to carry out calibration independently or on demand. This process can happen automatically at a set time interval or depending on the ambient temperature, for example. One advantage of precision balances with internal calibration is, among other things, that you can work regardless of location.
Balances with external calibration are more cost-effective and are suitable, for example, for laboratory balances that are only calibrated occasionally. These must then be adjusted or calibrated regularly using external adjustment weights. There are a few things to keep in mind. The gravitational forces and their effects should be taken into account. Therefore, such a precision balance should always be calibrated at the place of use or under the same gravimetric conditions.
What resolution does a laboratory balance have?
Laboratory balances differ greatly in their areas of application. Here are a few examples of how high or how many parts can be read on the display of a microbalance:
Example 1: A microbalance with a weighing range (maximum nominal load) of 500 grams and a division of 0.00001 grams (10 µg or 0.01 mg corresponds to a resolution of 50 million parts.
Example 2: A precision balance with a weighing range of up to 10,000 grams (10 kg) and a division of 0.1 gram corresponds to a resolution of 100,000 parts.
These examples make it clear what influence the resolution and weighing range of a laboratory balance have.
Measuring principle of a laboratory balance
When it comes to laboratory balances, a distinction is made between these common weighing principles:
1. DMS measuring principle (strain gauge attached to a spring body, electromechanical).
Strain gauge attached to a spring body, electromechanical
A load cell with a strain gauge (strain gauge) works electromechanically and is controlled by a deformation of the so-called Spring body influenced. This deformation changes the electrical resistance of the strain gauge. This change in resistance also changes the output signal. A so-called Measured value.
2. Electromagnetic force compensation
Electromagnetic force compensation (the current consumption of a permanent magnet is measured via a coil)
With the force-compensated load cell, the weight to be measured is compensated for towards zero with a counterforce. The interaction of magnetic and electrical components creates a current flow that is in direct proportion to the weight of the weighed mass.
This measuring principle produces the most precise measurement results to date and is used in very high-resolution scales such as micro, semi-micro, analyses , and precision balances are used.
3. Tuning fork (electromagnetic vibrations on the resonance body are measured)
Electromagnetic vibrations on the resonance body are measured
When the string vibrates, a vibrating string pickup acts as a sensor. By introducing the force to be measured, the frequency of the string is changed. These frequencies are measured and evaluated by electronics. The sensor sends digital values and, in contrast to force compensation and strain gauge technology, does not require any complex analogue-digital conversion.
4. Single-cell technology
This is a monoblock load cell as a further development of the force-compensated load cell
What kind of measuring principle do the laboratory balances from BOSCHE Wägetechnik have?
We offer laboratory balances in the variants DMS measuring principle and electromagnetic force compensation. Basically, both systems offer an equivalent division. The force-compensated laboratory balances have the advantage of a comparably higher nominal load range. This leads to greater resolution and thus increases the range of application of the laboratory balance.
Laboratory balances - resolution
| Type | Accuracy | possible division | rated load |
|---|---|---|---|
| Microbalance | 0.001 mg | 52,000,000 | up to 52 g |
| Analytical balance | 0.1 mg | 5,200,000 | up to 520 g |
| Precision balance | 0.001g | 6,400,000 | up to 64,000 g |
| Fine scale | 0.01g | 640,000 | up to 64,000 g |