Product Description

McLeod vacuum gauge(also called rotary compression vacuum gauge), is based on the ideal isothermal compression Boyle - Mariotte law designed. Because it can adopt its own parameters, pressure values directly considered, it addition to the pressure measurement, but also can be used as an absolute vacuum gauge vacuum gauge calibration some relatively. It is widely used in industry, national defense, scientific research, medicine, refrigeration and other vacuum measurement work.
1、Before use, first picked up the vacuum exhaust pipe up and let the vacuum table in the following, in order that the glass tube in the process of mercury beads into the exhaust pipe. Then pull the rubber plug, painted on the inner wall of the pipe mouth, castor oil or vacuum grease is directly connected to the vacuum system to be tested on the interface of open mechanical vacuum pump for 3-5 minutes, then slowly open the connection vacuum off-balance-sheet vacuum valve, then the instrument enter into the state of work.
2、If the vacuum degree of vacuum system for rough vacuum, for PM - type 2, then just look on the right side of the u-shaped pressure vacuum gauge, the reading value is to look at the scale of bead referred to value the sum of two mercury, when the vacuum degree is less than 0.2 KPa (200 pa), two mercury end basic in parallel, it's on the left side of the vacuum gauge, its operation method is the same as the original McIntosh vacuum gauge (surface printing office).
1、Transport and use must prevent inverted supine to prevent mercury back into the vacuum hose or water inside the closed tube silver beads into the middle clogged capillary capillary affect measurement accuracy. Therefore, prior to each use must first upright vacuum hose to the mercury can flow back into the vacuum gauge glass tube.
2、When measuring the vacuum gauge for the upright position,it is strictly prohibited to any gas strongly into the vacuum system,in order to avoid shock tube shatter glass tube.
3、Mercury vacuum gauge has been working within the chemical physics approach, a certain cleanliness. Long-term use due to reasons such as pollution caused by mercury oxidation will directly affect the measurement accuracy, should be promptly sent to repair, after passing inspection before use.
4、After the vacuum meter in the measurement, application clip will vacuum and vacuum system of the use of rubber tube clamping gas separation. Clean, this can maintain a vacuum gauge in mercury can also avoid the gage is removed separation, atmospheric strong impact vacuum gauge so that it is broken. If not to get off vacuum gauge, should after the mechanical vacuum pump stop, will be sure to gas circuit disconnect mechanical pump and the vacuum system, and put into the atmosphere in the mechanical pump in order to avoid mechanical pump oil back into the vacuum system and vacuum gauge polluted by oil.