Content1. What is portable balance?
1.1 Working principle of portable balance
1.2 Feature of portable balance
1.3 Range and accuracy of portable balance2. Classification of scales
2.1 Varieties of scales
2.2 Classification by accuracy3. Use of portable balance
4. How to buy portable balance?
What is portable balance?
With the development of measurement technology and electronics, the traditional purely mechanical structure of pole scales, bench scales, scales, and other weighing devices is gradually eliminated. Electronic weighing devices, such as electronic scale, portable balance
, and other scales, are favored by people for their accuracy, speed, convenience, intuition, and many other advantages.
The circuit composition of the portable weighing balance
includes a measurement circuit, differential amplifier circuit, A/D conversion, and LED display circuit. The most important component of the measurement circuit is the resistance-strain sensor. Resistance-strain sensors are the most widely used type of sensors and are widely used in electronic scales and various new structures of measuring devices. The role of the differential amplifier circuit is to amplify the weak analog signal output from the sensor a certain number of times to meet the input signal level requirements of the A/D converter. The role of the A/D converter is to convert the analog signal into a digital signal, and then the digital signal is delivered to the display circuit, and finally, the measurement results are displayed by the display circuit.
Working principle of portable balance
When an object is placed on a scale, the pressure of the object is applied to the transducer, which undergoes elastic deformation, resulting in a change in impedance. At the same time, the excitation voltage is changed, and a changing analog signal is an output. This signal is amplified by an amplifier circuit and output to an analog-to-digital converter. It is converted into a digital signal for easy processing and output to the CPU for computing and control. The CPU outputs this result to the display according to the keyboard command as well as the program. Until such results are displayed.
Feature of portable balance
a. Remote operation.
b. Automated control.
c. Intuitive digital display to reduce human error.
d. High accuracy and resolution.
e. Wide weighing range.
f. Special functions: weight deduction, pre-deduction, zeroing, totalization, warning, etc.
Range and accuracy of portable balance
|0.1g||100g 200g 300g 500g 1kg 2kg 3kg 5kg 10kg 15kg 20kg 30kg
|0.01g||100g 200g 300g 500g 1kg 2kg 3kg 5kg 10kg
|0.001g||100g 200g 300g 500g 1kg
|0.0001g||100g 110g 120g 200g 210g 220g
Portable balance & portable weights
|Application||Balance manufacturers, scale manufacturers, laboratories, etc.
Tips for using weights
a. Before using the weights, clean off the dust and other stains on the surface of the weights with a cleaning brush and wiping cloth.
b. It is strictly forbidden to touch the weights directly with your hands. When using the weights, please put on gloves and use tools to hold the weights.
c. Before balance testing or weight comparison, weights are required to be thermostatically maintained to achieve atmospheric conditions in the laboratory, otherwise, they will affect the test results.
d. After use, the weights must be stored in their original boxes.
Notes on weight selection
a. One hundred thousandth of a balance (0.01mg balance) needs to be calibrated with E2/E1 class weights.
b. One ten-thousandth of a balance (0.1mg balance) needs to be calibrated with E2 grade weights or F1 weights.
c. One-thousandth of a balance (1mg balance) calibrated with F1 class weights.
d. One-hundredth of a percent balance (0.01-gram balance) calibrated with F2 class weights.
e. One-tenth balance (0.1-gram balance) calibrated with M1 grade weights.
f. Calibration of large tonnage electronic scales or weighing scales with M1 grade cast iron weights.
Classification of scales
|According to the principle||Electronic scales, mechanical scales, and combined electromechanical scales.
|According to the function||Counting scales, price scales, weighing scales.
|According to the use||Industrial scales, commercial scales, special scales.
Varieties of scales
a. Desktop scales refer to electronic scales with a total weighing capacity of less than 30Kg.
b. Bench scale refers to the full weighing capacity of 30-300Kg or less of electronic scales.
c. Floor scales refer to electronic scales with a full weighing capacity of 300Kg or more.
d. Precision scales (portable balance
Classification by accuracy
Level I: special balances, precision ≥ 1/100,000.
Level II: high precision balance, 1/1,000 ≤ precision <1/100,000.
Level III: medium precision balance, 1/1000 ≤ fineness < 1/10,000.
Level IV: general scales, 1/100 ≤ precision <1/1000.
Resistive type: moderate price, high accuracy, and common use.
Capacitive type: small size, low precision; magnetic float type: extra high precision, high cost.
Oil-hydraulic type: now eliminated from the market.
Display type - LCD, free from plugging, power saving, with backlight.
If the weighing is not accurate and the display does not return to zero, the following methods can be used to solve the problem according to the situation.
a. The number display of jumping, first use the resistance file to measure the resistance value of the four lines between the two, a total of six groups. Such as 400-450 ohms for +E, -E; if 350 ohms, then +S, -S; for 290 ohms, then the R bridge arm.
b. In +E, -E terminal connected to +_5V voltage, the sensor accurately applies a pressure, such as the output +_S increased, the red meter pen is +S, and vice versa -S.
Use of portable balance
a. The maximum weighing of this product should not exceed its maximum range of +2%.
b. Overload will permanently damage the product.
c. The product should not be exposed to extreme cold or heat. The product will work well in normal environments. Please allow the product to acclimatize to a new environment for at least one hour before use.
d. Before use, turn on the machine and weigh with weights a few times to let the scale's internal components warm up, which will make the weighing more accurate.
e. Place the product in a clean environment where dust, moisture, vibration, air currents, or electromagnetic interference can hurt the stability and accuracy of the product.
f. Be lightly held and gently placed, the items should be gently placed on the scale when weighing, so as not to weigh inaccurately or damage the internal parts of the scale.
g. This product is a high precision product, so use it with great care to avoid vibration or dropping.
h. Use on a stable and windless horizontal surface.
Electronic scale inspection process
a. Overall check for wear and tear and whether the scale can be turned on.
b. Whether the display is sequential from 0 to 9, whether the numbers are ambiguous, whether they can be zeroed, and whether there is a backlight.
c. Whether the scale can be weighed with weights.
d. Whether the charger is intact and in use.
e. Whether the accessories are complete.
Troubleshooting portable balance
The top factors for inaccurate weighing or malfunction are low battery, incorrect calibration, overload, or operation on a non-level surface. Please note the above-mentioned points for proper use and maintenance of your product.
a. No display or low power symbol [lo] means the battery needs to be changed.
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b. [EEEEE] means overload. In this case, you should immediately remove the overload items.
c. [o_ld] means that the internal core of the scale has been damaged due to incorrect operation (e.g. impact, drop, or overload). Please try to recalibrate, and if the sensor is not seriously damaged, it can be used after recalibration.
d. If 88888 is displayed, please work on a vibration-free, stable plane.
Portable balance maintenance
a. If the electronic scale signal is unstable, then you should check whether the electronic scale body is screwed in, or whether the battery socket in the battery compartment of the electronic scale is in good contact. You can use a blade to dial the middle of the opening in the socket to increase the contact area of the battery.
b. If the electronic scale has a negative scale in the upper left corner of the display, then simply turn it off and then turn it on again to solve the problem.
c. If the electronic scale weighing is not accurate, then you can check whether the F2 and F3 data still exists, whether the current tare value has been modified, and whether the electronic scale tonnage has been altered.
d. If the electronic scale cannot be charged, then you can open the back cover of the meter to see if the connection is burned out. Check whether the instrument battery is damaged, with the scale battery plugged into the top of the instrument, and check to see if it can be turned on.
e. If the electronic scale cannot receive a signal or signal interruption, then you can first check the electronic scale power jack whether there is the phenomenon of loose, find a pointed thing to pull the plug large, and then check whether the battery power is sufficient if the electricity is not sufficient is also cannot receive the signal.
How to buy portable balance?
ANTITECK provide lab equipment, lab consumable, manufacturing equipment in life sciences sector.
If you are interested in our portable balance or have any questions, please write an e-mail to firstname.lastname@example.org, we will reply to you as soon as possible.