Pressure is one of the important parameters in industrial production. Correct measurement and control of pressure is an important link to ensure the good operation of the production process and to realize high-quality, high-yield, low-consumption and safe production. Therefore, the detection of pressure is getting more and more attention.
1. what is the electric contact pressure gauge？
The electric contact pressure gauge is one of the most frequently contacted pressure gauges by the grassroots calibrators because of its variety, complete models and wide range of applications. The general accuracy level is 1.0-4.0, especially in the measurement and control of boilers, pressure vessels or pressure pipelines. Usually the pressure gauge is used in conjunction with the corresponding relays, contactors and other electrical devices to realize the automatic control of the measured pressure system and the purpose of signal alarm. In the course of daily use, pressure gauges will have various problems and malfunctions due to vibration, oil, wear and corrosion, etc., which require timely maintenance and calibration.
- Working principle of electric contact pressure gauge？
The electric contact pressure gauge consists of a spring tube pressure gauge equipped with an electric contact. In addition to on-site indication, it is also used to signal pressure exceeding limits. The principle of pressure measurement is based on the measuring system in the spring tube under the pressure of the measured medium to force the end of the spring tube to produce the corresponding elastic deformation (displacement), through the fixed gear on the pointer will be the measured value of the indication in the dial; at the same time, drive the contact to produce the corresponding action (closed or open), so that the voltage control system in the circuit on or off, so as to achieve the purpose of the automatic control alarm and on-site instructions.
3. Calibration of electric contact pressure gauge？
The electric contact pressure gauge is actually a circuit switch operated by the pressure gauge. It is just an ordinary spring tube pressure gauge, retrofitted with electric contact signaling device. The calibration of the pressurized part is the same as that of the ordinary pressure gauge. The difference with the other pressure gauge is the reaction after connection. When verifying, first look at the accuracy of its pressure, and then look at the sensitivity of its connection reaction. Therefore, the verification is divided into two steps:
(1) Pressurized part of the general-purpose pressure gauge calibration value;
(2) The electrical part, after the demonstration value calibration is qualified, the electric contact signaling device should be calibrated under pressure and its connection performance should be checked with a multimeter.
4. Calibration of the pressurized part of the electric contact pressure gauge？
Comparison method is a common method to calibrate the pressure gauge. The standard pressure gauge and the measured pressure gauge are installed on the same level of the piston pressure gauge or pressure calibrator. After the piston is filled with working fluid (transformer oil) and the internal air is discharged, the needle valve on the oil cup is closed to form a closed system; the pressure of the extruded working fluid can be changed by rotating the handwheel on the piston of the piston type pressure gauge or calibrator. Hydraulic drive of the working fluid, so that the same level of standard pressure gauge and the pressure gauge to be measured pressure synchronization and equal changes; the standard pressure gauge and the pressure gauge to be measured to compare the indicated value.