Semi-Micro Analytical Balance Simplifies High Resolution Weighing

The LF-225 DR multi-function dual-range semi-micro analytical balance offered by Tovatech is an ideal solution when highly accurate weighing is required on a regular basis.  This balance is crafted in Japan with exceptional quality workmanship. Researchers, jewelers and others can benefit from the readability of 0.01 mg up to a 92 g capacity or 0.1 mg up to a 220 g capacity.  Linearity in these ranges is ±0.03 and ±0.02 mg; repeatability is ±0.02 and ±0.1 mg respectively.

The USB port on this Windows® compatible balance simplifies transfer of data to a pc or printer.

Featuring a one-key calibration function the LF-225 DR semi-micro balance has internal weigh chamber dimensions of 6 x 6.25 x 9 inches, an unusually tall space. The novel sliding door mechanism permits users to open the right side glass door with the left hand while placing samples on the weighing pan with the right hand … Read the rest

Understanding the 3 Rs + L of an Analytical Balance

Selecting the correct analytical balance for precise weighing is not an easy task.  We’ve covered several key points in previous posts but it’s always a good idea to provide a refresher course – especially as it relates to terminology that is sometimes confusing yet important.  In this case it’s the 3 Rs: readout, repeatability and reproducibility plus linearity.

We also provide hints on applying these criteria to selecting a lab scale.

R #1: What’s readout?  Also called readability it’s what you can read on the scale’s display panel.  Simple enough but in terms of specification you’ll have to decide on what you require in terms of the smallest difference displayed when weighing.  Usually its 0.1 milligram but in the case of a semi-micro balance it may be 0.01 mg.

R #2:  Repeatability is the ability of a balance to display the same result when an object is repeatedly placed … Read the rest

Scale with Remote Display Gives 0.1g Resolution

The separate weighing platform of the new ILS 50K and companion ILS 30K, 50 kg and 30 kg capacity industrial scales, each with 0.1 g resolution and a 5 g minimum load, makes these laboratory balances ideal quality control instruments for accurately weighing heavy toxic, odor-emitting or contaminated samples under fume hoods or in glove bags. The rugged stainless steel weighing platform handles compact high-density samples such as drilled cores and sawed beams of concrete, and is connected to the control and display unit by a cable approximately 1 meter long.

Now available from Tovatech, these lab scales are offered with external calibration (the ILS configuration using a separately purchased 30 or 50 … Read the rest

How to Select a Digital Bench Scale

A bench scale is generally placed on – you guessed it – a bench or a countertop.  A distinguishing characteristic of digital bench scales vs. platform scales is that the controls and display are part of the unit whereas a platform scale display is separate from the weighing platform.

Kern bench scales available from Tovatech have weighing ranges from 6 to 60 kg allowing them to support a broad range of applications.  Most are available with standard disposable battery power or optional rechargeable battery power in addition to line power.  This is a big plus if you need portability or perform weighing operations beyond the reach of an outlet.

Specifying Digital Bench Scales

This is a straightforward process until it comes to added bells and whistles you may require for your operations.  First the basics:

At the top of your list is the maximum weight the scale can handle.   If … Read the rest

How to Select a Digital Platform Scale

If you are looking for a digital platform scale you know that there are many choices and that the term covers a variety of designs and functions.

In general and in contrast to bench scales, a platform scale has a weighing plate or “platform” upon which the load is placed, and a separate programming and display module.  As either a standard feature or as an option the programming/display unit can be column-mounted to the base of the weighing plate to improve visibility.  Some models have wall-mounted displays; others have wireless connectivity between the weighing unit and programming/display panel. 

What to Look For in Platform Scales

Superior construction capable of … Read the rest

Economical Analytical Balance has Single Cell Weighing System

Research labs with small budgets can achieve high weighing accuracy with an analytical balance equipped with a single-cell weighing system.  In addition to high accuracy this weighing mechanism is noted for stable temperature behavior and fast stabilization times (approximately 3 seconds), which translates higher weighing efficiency.  The single cell system, formerly a premium feature, is standard in the economically priced Kern ABS-N and ABJ-NM family of precision balances available from Tovatech.

Analytical Balance Selection Criteria

Eight models are available in the series, all with 0.1 mg readout, 0.2 mg reproducibility and ±0.3 mg linearity.  The ABS models are externally calibrated using a separately purchased calibration weight; the ABJ models feature automatic internal calibration … Read the rest

How to Avoid Analytical Balance Weighing Errors

The Kern ABT analytical balance with automatic internal calibration
The Kern ABT analytical balance with automatic internal calibration

Precision weighing with an analytical balance requires care and alertness on the part of the operator. Many factors can influence the performance of an analytical laboratory balance.  Where precision is paramount an error of 0.001gram or smaller can be significant when strict regulations apply.

How Lab Balance Errors Occur

In simple terms, digital analytical balance errors arise when the instrument inaccurately records the weight of the sample due to influences that can occur without the operator’s knowledge, or because of poor weighing practices.  Influences can be external or internal.

Although externally induced errors can be caused by many factors, they are easy to reduce or eliminate.  Usually these causes are traced to lapses in precision balance operating procedures relating to the sample and the laboratory environment.  Here are some suggestions on reducing external sources of balance weighing errors.  Note that some … Read the rest

Blood Typing

Many years ago I had to take an employer-required class in project management. Having already worked as a project manager with good results, I was prepared to be bored, but I tried to have a good attitude. Luckily, my mind was cracked open enough to accept some input, because (even though I felt I could have taught the class) I learned a lot from hearing another perspective. Since then, I’ve tried to stay receptive, even when I think I know something, and I’ve nearly always added to my knowledge, like I did watching this video outlining blood types. The simple explanation will let you know why not every unit of blood in the blood bank refrigerator will be a good transfusion candidate for you.… Read the rest

Wireless Platform Scale Works Most Anywhere

Taking a digital platform scale to the job rather than the job to the scale is easier with the new Kern EOS-F wireless platform scale now available from Tovatech.  What sets it apart from conventional platform scales is a 3-channel integrated radio that communicates between the display/control module and up to 3 weighing platforms. Connectivity extends to 10 meters clear sight. The system operates on standard current or up to 70 hours with optional battery power.

This wireless platform scale works as a non-automatic balance. Operators manually and carefully place material to be weighed in the center of the weighing plate. Once a stable weighing value is reached (the scale is stabilized) the weighing value can be read.  Data should be manually recorded for record-keeping.

A grab handle and 2 rollers on the 36 x 22 x 2.5 inch weighing platform facilitate transport between locations.  The compact display/control module, which … Read the rest

IP65-Rated Platform Scales Solve Multiple Weighing Tasks

Platform scales are workhorses of weighing, often finding themselves in environments that cause less rugged weighing systems to fail.   The new Kern SFE platform scales, now available from Tovatech, build on the ruggedness and reliability of platform scale weighing systems.  Their silicon-coated load cells and separate free-standing or wall mounted stainless steel control panel/display units are packaged in IP65-rated housings.  This means these high-precision but rugged platform balances are totally protected against dust.  When exterior surfaces need cleaning they resist low-pressure jets of water.*

Three Models with Readouts of <1 oz

SFE platform scales provide maximum weighing to 15, 30 and 60 kg (33, 66 and 132 pounds).  Respective readouts are 5, 10 and 20 grams (all less than one ounce).   Easy-to-follow instructions allow operators to use the control panel to perform a variety of weighing tasks including recipe, tolerance, and animal/dynamic.   Tolerance (check weighing) to an upper/lower value is … Read the rest