First, the choice of the installation environment of the balance
1. Choose a suitable studio: prevent oscillation and vibration, only one entrance and exit, the fewer the windows, the better, the workbench should be placed in the corner of the room.
2, to avoid the effects of light: avoid direct sunlight, the lighting device should be kept away from the workbench, preferably with fluorescent lights
3, reduce the impact of airflow: away from the fan, air conditioning, away from airflow and heat radiation sources, avoid weighing at the door
4, the choice of weighing platform: reduce oscillation, diamagnetic, static protection, balance dedicated workbench, horizontal position
Second, the prerequisite for achieving correct weighing
1. Frequently encountered problems: the balance is unstable, the balance of the balance is reproducible, and the balance is too slow.
2, the most common reasons: changes in ambient temperature, static electricity with samples, weighing or releasing water from weighing samples, magnetization of weighing samples, effects of air buoyancy, improper setting of balance technical parameters
3, to avoid the impact of ambient temperature: Do not call the items directly from the drying oven or freezer, so that the temperature of the sample is close to the temperature in the laboratory or weighing room, take the items with tweezers, do not put your hands in the weighing room Otherwise, the temperature will change, and choose a container with a small contact surface.
4, reduce the impact of static electricity: increase the air moisture content, keep the relative humidity of the air is 45~60% RH is ideal, put the weighing tube in a metal container, use the static elimination device, the balance is grounded
5. Reduce the effect of moisture absorption or evaporation: use a clean and dry container, and keep the weighing pan dry without water droplets, use a fine neck bottle, cover the lid or stuff a wooden stopper
6. Reduce the magnetic influence: Degauss the strong magnetic material, use the bracket to isolate the sample from the weighing pan, use the hook-weighing the hook, and shield the magnetic force - place the sample in a non-metallic container, and the user can use non-magnetic Materials minimize magnetic effects
Third, the analytical solution after encountering problems in use
1. How to use the balance when the warm-up time is low
When conditions permit, the balance should be fully warmed up, and the higher the accuracy of the balance, the higher the preheating requirements. Generally, it should be more than 30 minutes to make the balance work stably and the measurement data is accurate and reliable. However, for various reasons, the user may use the balance when the balance warm-up time is short or even too late to warm up. At this point, the following methods can be used to reduce the measurement error:
1). Use standard weight correction before measurement, and select different weights according to the level of the correctness level.
2). The time reading should be fixed after loading. For example, they are read with the indication value of 5 seconds after loading or the values ​​when they are displayed in units.
3). Take multiple measurements and take the average value (3~5 times).
2. How to use the reading or continuous measurement after loading for a few minutes or tens of minutes
If the user needs to load a few minutes or tens of minutes of reading, or continuous measurement (especially tare without peeling), the following methods can be used to reduce the measurement error:
1). Fully preheat the balance.
2). The balance uses a small change in ambient temperature (the temperature changes by no more than 5 °C per hour), the airflow is small, and the place where people move less.
3). Correct with standard weight before use.
4). Subtract the indication before unloading to the value of the unloaded to get the true value of the load.
5). Take the average value (3~5 times).
3. How to use when the airflow is large
In the air outlet, the fan blows directly, the personnel move frequently, and the balance is used in a large airflow in the hallway aisle or outdoors, which often changes the balance value and is not easy to stabilize. The higher the accuracy of the balance, the greater the airflow, the more obvious this phenomenon, so the balance should be used where the airflow is small. If the balance is used, the balance must be used in the case of large airflow. The user should use the following methods to measure and reduce the measurement error to avoid unnecessary loss.
1). Cover the balance with a windshield. The windshield is very simple to make. Use a waste cardboard box slightly larger than the balance to seal the bottom. After the top edge is cut off, it is buckled on the balance. Cut out on the side of the balance display window to be unloaded and displayed. The window is fine.
2). Fully preheat and correct before use.
3). Take multiple measurements and take the average value (3~5 times).
4. Check method when booting without display
1). Check if the power supply system is working and the working voltage is normal.
2). Is the power cord plug loose or not in contact?
3). Whether the transformer has hot or even burnt smell, there is hot or burnt smell indicating short circuit or transformer damage
4). Whether the display device is damaged or not. Such as whether the LCD screen is broken
5). Caused by other reasons
5. Display the "L" or "H" check method after power on.
“L†means that the initial load is too light, “H†means overload, and after these phenomena, it can be restarted. If “L†or “H†is still displayed after restarting, check the following method:
1). Is the disc in contact with the housing?
2). The sensor is damaged. The user can recall whether the balance was bumped, dropped or overloaded before this use after the last use.
3). Caused by other reasons
6. Indication is unstable
1). Is the use environment suitable, whether there is strong airflow, electromagnetic interference, whether the humidity is too large, the temperature difference is too large, etc.
2). Is the disc in contact with the housing?
3). Whether the sensor components are in contact with other objects. If the user has long-term dust or fiber objects, they may fall into the balance. This is inside the balance and is not easy to find.
4). Sensor or other electronic components are damaged
5). If the amplitude of the jitter is extremely large, it may be that the correction coefficient in the program is incorrect, and it can be re-corrected after being cleared. Note that pressing the calibration button after the balance shows zero is faster, otherwise the value of the balance may change when you press the calibration button, resulting in “CEâ€.
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