W&J Instrument CO., LTD.

  Electronic balances   have become standard equipment in many high school and university chemistry departments. They enable users to quickly and accurately measure the quality of substances to achieve accuracy that traditional balances cannot. Maintenance of electronic balance 1. The sensor of the electronic balance is the primary problem of its maintenance First of all, dust and dust removal is an essential maintenance work for electronic balances. Since the sensor of the key components of the electronic balance is composed of the shell magnet, pole shoes and coils, etc., it is installed under the weighing pan, and its precision is very high and sensitive. Therefore, the balance room should be kept clean, and it should be avoided that items are scattered during weighing and affect the normal operation of the sensor. Therefore, we must regularly clean the sanitation of the balance room, and the dust and objects scattered in the balance cover to minimize the failure rate of th...

  DC  thermostatic water bath   is currently the most advanced experimental device in China that integrates low temperature, constant temperature, and agitation. It is suitable for low temperature experiments in scientific research, biology, physics, medicine, chemical and other departments. It can replace dry ice and liquid nitrogen. The low-temperature reaction and related equipment provide low-temperature conditions. It can also be used as a low-temperature water tank for viscosity testing. The bottom is equipped with strong magnetic stirring to make the temperature in the tank more uniform. It is suitable for low-temperature constant temperature chemical synthesis experiments. The bottom of the DC series low temperature constant temperature tank is equipped with magnetic stirring, the stirring speed is adjustable, and the fully enclosed compressor unit is cooled. The refrigeration system has multiple protection devices for overheating and overcurrent. . The cold liqui...

  I. Overview Thermostatic water bath   adopts microcomputer intelligent control and PID self-tuning adjustment. It has high temperature control accuracy, small temperature fluctuation, high cooling efficiency and low noise. It is an ideal temperature sensing experiment instrument and constant temperature experiment instrument. Stable and reliable, easy and safe operation. Constant temperature water bath can be divided into vertical low temperature constant temperature and horizontal constant temperature water bath. There are many manufacturers producing thermostatic water baths on the market today, and their specifications are not the same, but manufacturers divided by DC are more common. These products have the following advantages: [1] The refrigeration system has multiple protection devices for overheating and overcurrent. [2] Microcomputer intelligent temperature control, stable temperature and easy operation, high and low temperature over temperature alarm, PID automatic...

  Electronic balance works: The electronic balance uses the principle of electromagnetic force balance to achieve weighing. Before the weighing plate is loaded, the balance is in an initial equilibrium state. After the weighing pan is loaded, the balance is in an unbalanced state. Under the action of the weight of the weighed object, the light shielding plate moves downward, so that the light-emitting diode D2 senses the light emitted by D1, and the light signal is converted into a voltage signal by the photoelectric detection circuit . The voltage signal is adjusted by PID to provide a moving coil (movable coil) with a current proportional to the mass of the weighed object. Under the action of the magnetic field of the permanent magnet, the moving coil will generate an upward force F to move the light shielding sheet upward. After the light-shielding plate is moved upward, the output voltage of the photoelectric detection circuit is reduced, and the PID integration link causes the...