Explosion proof electric contact pressure gaugeDetailed product description：

The YX-150BT explosion-proof electrical contact pressure gauge is designed in accordance with the relevant provisions 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 - Explosion proof Electrical Equipment" d ", and manufactured with approved drawings and technical documents by a nationally designated inspection agency.
The explosion-proof category of the instrument is Class II explosion-proof type B level T4 group, with the symbol Exd Ⅱ BT4.
Instruments are suitable for measuring the pressure of non crystalline, non solidified explosive mixtures or various non explosive media in places with explosive hazards.
By using instruments in conjunction with electrical components such as relays and contactors that have corresponding explosion-proof performance or take corresponding safety measures, automatic control and alarm signaling can be achieved for the controlled system.
Main technical indicators of explosion-proof pressure gauges with electrical contacts
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； 0～40； 0~60； -0.1～0.06； -0.1～0.15； -0.1～0.3； -0.1～0.5； -0.1~0.9； -0.1～1.5； -0.1～2.4MPa
Control mode: upper and lower limit slow contact switch
Maximum operating voltage: DC 220V or AC 380V;
Contact power: 10VA
Working position: Vertical installation
Environmental conditions for use: -10~50 ℃, relative humidity not exceeding 80%, and explosive mixtures should belong to Class IIB T4 or below. The working vibration and rapid pulsation of the measured medium should not affect the reliable operation of the instrument contacts.
Temperature effect: The displayed value should not exceed 0.4%/10 ℃, the set point should not exceed 0.6%/10 ℃, and the operating temperature should deviate by 20 ± 5 ℃.
Insulation strength: 50Hz sine AC 2000V for one minute
Weight: 6kg
The structural principle of explosion-proof pressure gauge with electric contact
The instrument consists of an explosion-proof shell, a measurement system, an electrical contact group, a regulating device, and an outlet box.
The explosion-proof shell of the instrument has good explosion-proof performance, so it can not only withstand the explosive pressure generated by the explosive gas mixture inside the shell in the event of an explosion due to the influence of sparks or arcs during normal operation, but also effectively prevent the heat energy generated from spreading smoothly outward, and can only slowly diffuse outward along the small gaps of the explosion-proof joint surface inside the shell. At this point, the instantaneous temperature transmitted to the outside of the shell has dropped below the ignition temperature of the explosive gas mixture, so it will not cause detonation.
The working principle of the instrument is based on detecting the elastic deformation of the spring tube in the measurement system of the detection element. Through mechanical transmission, it drives the contacts in the electrical contact group to produce corresponding actions of closing or opening, so as to connect or disconnect the circuit in the pressure control system, thereby achieving the purpose of automatic control alarm and on-site indication

·Types and basic parameters of explosion-proof joint surfaces

Shell volume V (L)	＞0.5
Joint surface type	plane	Cylinder (movable part)
Minimum effective length of explosion-proof joint surface Lmm	fifteen
Minimum effective length L1 from the edge of the screw through-hole to the explosion-proof joint surface	eight
Maximum gap or diameter difference of explosion-proof joint surface Wmm	zero point one five
Surface roughness Ra of explosion-proof joint surface	three point two	one point six

Note: An example of the effective length and gap width of the explosion-proof joint surface can be found in the schematic diagram of the explosion-proof shell structure.
·Explosion proof shell and pressure guiding system components and materials

Part Name	Material grade or name	Part Name	Material grade or name
Drive shell cover junction box	ZL102 (or ZL-102, ZL-101)	Thin gasket	L3
		joint	twenty
bushing	QAJ9-2	Bourdon tube	3J53
observation window	organic glass

Note: The material of the observation window of the explosion-proof electric contact pressure gauge has an impact resistance strength of not less than 4J. Once the observation window is damaged, it is not allowed to be used.