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Explosion-proof electric contact pressure gauge
The explosion-proof electric contact pressure gauge is designed according to the relevant provisions of GB3836.1 83 "General requirements for explosion-proof electrical equipment for explosive atmospheres" and GB3836.2 83 "Explosion-proof electrical equipment for explosion-proof electrical equipment "d"" and related standards. It is manufactured through drawings and technical documents approved by the state-designated inspection agency. The explosion-proof category of the instrument is the Class B explosion-proof Class B T4, which is marked Exd‖BT4.
The instrument is suitable for measuring non-crystalline, non-solidified explosive mixtures or various non-explosive media pressures in potentially explosive atmospheres.The meter can be used with the electrical equipment (such as relays and contactors) with corresponding explosion-proof performance or corresponding safety measures to achieve automatic control and signaling (alarm) for the controlled system. | | ■Main technical indicators: | Accuracy class：1.6
Scaling 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,-0.1~2.4MPa.
Control mode: upper and lower limit slow contact switch Maximum working voltage: DC 220V or AC 380V Contact power: 10VA Working position: vertical installation
Ambient conditions: -10 ~ 50 ° C, relative humidity is not more than 80%, and the explosive mixture should belong to the ‖B grade T4 group, the working vibration and the rapid pulsation of the measured medium should have no effect on the reliable action of the meter contact. Temperature effect: the indication value is not more than 0.4%/10°C, and the set point is not more than 0.6%/10°C (use temperature deviates from 20±5°C) Insulation strength: 50Hz sinusoidal alternating current 2000V for one minute Weight: 6kg | ■Structural principle;
| | The instrument consists of an explosion-proof enclosure, a measuring system, an electrical contact set, an adjustment device and a outlet box. The flameproof enclosure of the meter has good flameproof performance, so it can effectively withstand the explosion pressure generated by the explosive gas mixture inside the casing in the event of an explosion due to the influence of spark or arc during normal operation. The heat energy generated thereby prevents the heat energy from spreading outward smoothly, and can only slowly spread outward inside the casing along the minute gap of the flameproof joint surface. At this time, the instantaneous temperature transmitted to the outside of the casing has been lowered below the ignition temperature of the explosive gas mixture, so that no explosion is caused.
The working principle of the meter is based on the elastic deformation of the detecting element (the spring tube in the measuring system), which is driven by the mechanical drive to drive the contacts in the electric contact group to generate corresponding actions (closed or opened) to make the pressure control system The circuit is switched on or off for automatic control of alarms and on-site indications. | ■Dimensions
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