Product Description:
YJTX-150-B 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 the designated national inspection agency.
The explosion-proof category of the instrument is Class 8741B explosion-proof type T4 group, with the symbol Exd 8741BT4.
Instruments are suitable for measuring the pressure of non crystalline, non solidified explosive mixtures or various non explosive media in places with explosive hazards.
Instruments can be used in conjunction with electrical components (such as relays and contactors) with corresponding explosion-proof performance or safety measures to achieve automatic control and signaling (alarm) of the controlled system.  

Technical specifications of YJTX-150-B explosion-proof electric contact pressure gauge:
Accuracy level: 1.6
Scale range: 0~0.16, 0~0.25, 0~0.4, 0~0.6, 0~1.0, 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, -0.1~2.4 MPa
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 B 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 ℃, and the set point should not exceed 0.6%/10 ℃ (with a deviation of 20 ± 5 ℃ from the operating temperature)
Insulation strength: 50Hz sine AC 2000V for one minute
Weight: 6kg

Structural principle:
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 the elastic deformation of the detection element (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, so as to connect or disconnect the circuit in the voltage control system, thereby achieving the purpose of automatic control alarm and on-site indication.  

Overall dimensions: