Selasa, 28 Juni 2011

Scale Calibration for Getting Accurate Measurements

A scale is a measuring tool to determine the weight or mass of an object. A spring scale measures the weight with a spring range shift under load. Comparing the torque balance on the arm because the weight of the sample to the torque on the arm as a standard reference weight using a horizontal lever. The balance is different from the scales, the balance measure the mass, while the scale measures the weight. Scales used in industrial and commercial applications, and products from feathers to loaded tractor-trailers that are sold by weight. Specialty medical scale and bathroom scales used for measuring human body weight.

Scale Calibration
Scale calibration is the process used to ensure that the weight scale is to provide accurate information. To scale commercial use, calibration may be needed every few weeks or months, to confirm that the scales are still hard to accurately, while the scale of the house may be left uncalibrated for quite a long time

Scales began to show an accurate weight for various reasons. Sometimes the scale components become worn, change to read, and environmental factors may play a role as well. For example, the scale of many who do not perform well in cold air, and the scale calibrated to work in an environment such as a bakery; warm and humid conditions may be turned off if brought to a cold store room. The more the scale used, the more likely it is that inaccuracies will arise.

The best way to calibrate the scale is to use a known weight to see if it returns the correct measurement scale. Some companies manufacture special weight to be used in the calibration scale, but it is also possible to use something like a sack of flour, a set of barbells, or other heavy objects that must be known. To calibrate the scale, the weight is set on a scale and read the note. Furthermore, the scale can be adjusted until it yields the correct weight measurement.

Some scales adjusted only with screws or levers that can be moved. Digital scales may have a special key used in the calibration scale. Owner's manual for the scale usually provides specific information on calibration.

Most people use different weights for a calibration scale to confirm that the scale is correct within some range. Some scales may be less accurate at low load, in terms of adjustments to the low weight on the scale can get rid of the scale at a higher weight.

Senin, 27 Juni 2011

About Temperature Calibration

calibration of a thermometer
Calibration is a process of comparing the response of the instrument to agree with standard instrument for measuring range, to determine the deviation between the measurement values ​​are correct and appropriate
value (an industrial calibrator is thus "true value").

In order to maintain consistent quality of products manufactured, it is required to perform the calibration process on the sensor and instrument. There is is the philosophy of some of the calibration measurement and control circuit. The basis of the method chosen must always be to incorporate temperature sensor. 

This does not make sense just to calibrate and adjust the electronic part of loop. A rule of thumb says that only 10% of the total error in electronics, nad the other 90% is in the sensing element. So it is important that
temperature sensor is tested, mean physically affected by the desired temperature. A dry-block calibrator is an easy method for creating a "process" temperature.

The output of the sensor can be taken from anywhere in the loop and the rest of the loop can be tested electronically.

Related artilces you may interested on How do You Calibrate a ThermometerThermometer Calibrating tips and Calibrating Thermometers guide.

Sabtu, 11 Juni 2011

About Pipettes You Should Know

what is a pipette

A pipette is a kind of chemical dropper used in laboratory experiments to measure the volume of transport equipment and chemicals. There are different designs of pipette but they all have same function. Pipette is entered into a vessel containing fluid, in which he creates a vacuum. The vacuum suction draws up that appointed by number of fluid and to distribute to that others. Pipette well-made borosilicate, alumino silicate or quartz. Let's look four type of pipettes:
  • Micropipettes are made to measure and release small amounts liquid. Micro pipettes released between the 1 and 1,000 microliters. They are frequently used in injection experiments and measurements, because they are very precise. 
  • A volumetric pipette, such as volumetric flasks, are used to measure and released a specified amount fluid to add others. Some of different sizes available for measuring predefined number of liquid, with that milliliter of popular sizes 10, 25 and 50.Volumetric A pipette that most are often be used in titration of experiments.
  • A graduated pipette works similarly graduating cylinder. It is indicated by a series ofgraduated line for measuring the quantity of fluid before and after eliminated. It is notas accurate as a volumetric pipette, but it serves its purpose.
  • A desert is a dropper pipette basis are used to attract and released a number ofrandomized fluid. It is not calibrated to a certain volume. This species is similar to a large dropper pipette.

Jumat, 10 Juni 2011

Electronic Torque Wrench

Electronic Torque Wrench

 Electronic Torque Wrench is a precision hand tool designed to allow precise manual tightening threaded fasteners. The tool is designed around a conventional ratchet lock with standalone microprocessor built into the handle lock. Control housing include the operating controls, indicator lights, audible alarms, digital display and electronic controls. A final protective caps at the end of the wrench handle providing access to a container 12-pin to connect the battery charger, plates XY, interface, or a test connector. Spanner has the capability show that desired angle and tightening the bolts and mechanical properties together for optimum tightening of force. 

What should an excellent Certificate of Calibration Contain?

Certificate of Calibration

An excellent Certificate of Calibration should contain:
  • Name and address of Customer
  • Instrument and the type
  • Instrument Serial Number
  • Date Of Test
  • Date of next Test
  • Equipment used to carry out the calibration and serial numbers
  • Measurements
  • Interpretations of the figures
  • Statement of confidence probability
  • Statement of traceability
  • Ambient temperature at the time of calibration (If On Site)
  • Signature of calibration Engineer
Please see also:

Why do your Instruments need to be Calibrated

Instrument Calibration Process
Each tool used to measure physical parameters have a particular accuracy. This means that over the time period it is might to experience a number of drift, that would generate false readings if the instrument is used to measure these parameters.

Regularly calibration of instruments is the most satisfied method to make sure the best performance for any instrument.