Product description of explosion-proof electric contact pressure gauge:
系按GB3836.1 83《爆炸性环境用防爆电气设备通用要求》和GB3836.2 83《爆炸性环境用防爆电气设备隔爆型电气设备“d”》的有关规定及相关标准进行设计，并经由国家指定的检验机构所审批的图样和技术文件进行制造。 Explosion-proof electrical contact pressure gauges are designed in accordance with the relevant regulations and standards of GB3836.1 83 "General requirements for explosion-proof electrical equipment for explosive environments" and GB3836.2 83 "Explosion-proof electrical equipment for explosive environments" , And manufactured through the drawings and technical documents approved by the country's designated inspection agency. The explosion-proof category of the instrument is Class Ⅱ flameproof type B T4 group, and its mark is ExdⅡBT4. The instrument is suitable for measuring the pressure of non-crystalline, non-solidified explosive mixtures or various non-explosive media in places with explosion danger. The instrument can be used with electrical devices (such as relays and contactors) with corresponding explosion-proof performance or corresponding safety measures to achieve the purpose of automatic control and signalling (alarm) to the controlled system.
Accuracy level: 1.5
Scale range: 0 ~ 0.16; 0 ~ 0.25; 0 ~ 0.4; 0 ~ 0.6; 0 ~ 1; 0 ~ 1.6; 0 ~ 2.5; 0 ~ 4; 0 ~ 6; 0 ~ 10; 0 ~ 16; 0 ~ 25; 0 to 40; 0 to 60; -0.1 to 0.06; -0.1 to 0.15; -0.1 to 0.3; -0.1 to 0.5; -0.1 to 0.9; -0.1 to 1.5; -0.1 to 2.4Mpa
Control method: upper and lower limit slow-moving contact switch
Maximum working voltage: DC 220V or AC 380V;
Contact power: 10VA
Working position: vertical installation
Operating environmental conditions: -10 to 50 ° C, relative humidity not greater than 80%, and explosive mixtures should belong to Group IIB T4 or lower. The working vibration and the rapid pulsation of the measured medium should not affect the reliable operation of the meter contacts.
Temperature influence: The displayed value is not greater than 0.4% / 10 ° C, and the set point is not greater than 0.6% / 10 ° C (the use temperature deviates from 20 ± 5 ° C).
Insulation strength: 50Hz sine AC 2000V for one minute
Flameproof joint surface type and its basic parameters
结构原理 Structure principle of explosion-proof electric contact pressure gauge
Explosion-proof electric contact pressure gauge is composed of flameproof enclosure, measuring system, electric contact group, adjusting device and outlet box.
The explosion-proof enclosure of explosion-proof electrical contact pressure gauges has good explosion-proof performance. Therefore, explosion-proof electrical contact pressure gauges can not The explosion pressure generated can effectively prevent the thermal energy generated from spreading smoothly outward, and can only slowly spread outwards in the shell along the small gaps of the flameproof joint surface. At this time, the instantaneous temperature transmitted to the outside of the housing has fallen below the ignition temperature of the explosive gas mixture, so it will not cause an explosion.
的工作原理是基于检测元件(测量系统中的弹簧管)的弹性变形，通过机械传动使之带动电接点组中的触头产生相应的动作(闭合或断开)以使控压系统中的电路得以接通或断开，从而实现自动控制报警和现场指示的目的。 The working principle of the explosion-proof electrical contact pressure gauge is based on the elastic deformation of the detection element (spring tube in the measurement system), and the mechanical contact is used to drive the contacts in the electrical contact group to produce corresponding actions (close or open) to control The circuit in the pressure system can be switched on or off, so as to achieve the purpose of automatic control alarm and field indication.