What are the black pointers and red pointers in the gas pressure meter? How do you read them?
Black pointer is pressure readings (direct reading), red needle is to adjust the lower limit pressure for action.Double needle pressure gauge is mainly used for vehicle are used to measure the hydraulic system or gas cylinder pressure, can also be used without corrosion to copper tin alloy, Aluminum Alloy brazing, pressure measuring various medium non crystallization and solidification of the. The twin needle pressure gauges can simultaneously measure the pressure of two identical or different ones (the difference generally should not be greater than the limit of 1/3 in the scale range).Principle: the instrument consists of two sets of independent measuring systems and indicating devices.The instrument works based on the elastic deformation of the spring element (the spring tube in the measuring system). The pressure of the measured medium, so that at the end of two after the spring tube of each corresponding displacement, with the help of the rod drive gear transmission and amplification by the fixed gear shaft of the black and red pointer of the two measured values respectively in the disc of show.
Electric contact pressure gauge has three wires, one is public, hands is adjustable, can be a pointer to 0.4M, with low voltage starting control relay, another pointer to 0.6M is connected with the high-pressure stop relay line is a common line public high voltage control.The upper pointer is the upper bound, and the following pointer is the lower bound, and the middle black pointer indicates the actual pressure value. When the actual pressure is on the upper limit of [1], it is connected with the upper limit and the lower limit is broken. When the actual pressure is between the upper and lower limits, the common and upper and lower bounds are disconnected.When the actual pressure is below the lower limit, the common and lower limit switches on, and the upper limit is broken. The electric contact pressure gauge is used to control the upper and lower limit pressure. It is not enough to have an electric contact pressure meter, and also an automatic control box for controlling the pump.Add a relay, electric contact pressure of 1 high pressure points on the table, a point, a low voltage, current direction: line into the midpoint, after low point to normally closed relay 1 groups of contacts, to the end of the coil of the contactor relay coil, the other end is connected with the zero line.Choose another set of contactor on the normally open contact, the 2 end of the parallel to the pressure gauge at the low end and the midpoint. The control of the intermediate relay is from the middle of the line of fire into the pressure gauge, from the high voltage point to the middle relay coil section, and the middle relay coil to the other section to the zero line.
This is a two needle pressure gauge. The black pointer indicates the pressure value in the current pipe. The red pointer is used to set the maximum pressure as a warning function. When the work pressure, the black pointer, approaches the red pointer, notice that the pressure has reached the ceiling.
