Explosion-proof electric contact pressure gauge

The explosion-proof shell of the series explosion-proof electric contact pressure gauge has good explosion-proof performance. Therefore, the explosion-proof electric contact pressure gauge can withstand the impact of sparks or arcs during normal operation and can withstand the explosive gas mixture inside the shell. The explosion pressure generated when causing an explosion can effectively prevent the resulting heat energy from spreading smoothly outwards, but can only slowly spread outwards along the tiny gaps inside the shell along the flameproof joint surface. At this time, 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 an explosion.
Explosion-proof electric contact pressure gauge
Technical indicators
Accuracy level: .
Measurement range: ~.~
Control mode: upper and lower limit slow contact switches
Maximum working voltage: or
Contact power
Working position: Vertical installation
Using environmental conditions: ~℃ Relative humidity is not greater than ℃ and the explosive mixture should belong to the IIB level group or below Working vibration and measured medium The sharp pulsation should have no impact on the reliable action of the instrument contacts.
Temperature influence: The indication value is not greater than ./℃ and the set point is not greater than ./℃ (the operating temperature deviates from ℃).
Insulation strength: z sinusoidal alternating current for one minute
Weight
Flameproof joint surface type and its basic parameters
Shell volume
.
Joint surface type< br/> Plane
Cylinder (movable part)
Minimum effective length of the flameproof joint surface

Minimum effective length from the edge of the screw through hole to the explosion-proof joint surface
/>
Maximum gap or diameter difference between explosion-proof joints

Surface roughness of explosion-proof joints

Note: Effective length and gap of explosion-proof joints Examples of widths can be found in the flameproof enclosure construction diagram.
Parts and materials such as flameproof shell and pressure guiding system
Part name
Material grade or name
Part name
Material grade or name
Shell cover

Outlet box
Z

(or ZZ)
Thin gasket
Connector
Bushing
Q< br/> Spring tube
Observation window
Organic glass

Note: The material of the observation window of the explosion-proof electric contact pressure gauge
has an impact strength of not less than. Do not use the observation window once it is damaged.
Explosion-proof electric contact pressure gauge
Structure principle
The explosion-proof electric contact pressure gauge is composed of an explosion-proof housing measurement system electric contact group adjustment device and an outlet box.
The flameproof shell of the explosion-proof electric contact pressure gauge has good explosion-proof performance. Therefore, the explosion-proof electric contact pressure gauge can withstand the impact of sparks or arcs during normal operation and can withstand the explosive gas mixture inside the shell once caused. The explosion pressure generated during the explosion can effectively prevent the resulting heat energy from spreading smoothly outwards, but can only slowly spread outwards along the tiny gaps inside the shell along the flameproof joint surface. At this time, 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 an explosion.
The working principle of the explosion-proof electric contact pressure gauge is based on the elastic deformation of the detection element (the spring tube in the measurement system), which drives the contacts in the electrical contact group to produce corresponding actions (closing or opening) through mechanical transmission. In order to enable the circuit in the voltage control system to be connected or disconnected to achieve automatic control of alarms and on-site instructions.