Product Overview
The YX-100-B Explosion-Proof Electric Contact Pressure Gauge is suitable for measuring the pressure of mixtures or various non-explosive media in hazardous locations where explosion risks exist. The gauge is designed in accordance with GB 3836.1-83, "Electrical Apparatus for Explosive Gas Atmospheres – General Requirements," and GB 3836.2-83, "Electrical Apparatus for Explosive Gas Atmospheres – Flameproof Enclosure 'd'," as well as other relevant standards. It is manufactured according to drawings and technical documents approved by a nationally designated inspection authority. The instrument is classified as Group II, Flameproof Type, Grade B, Temperature Class T4, with the explosion-proof marking Ex d IIB T4.
Technical Specifications
Accuracy Class: 1.6
Scale Range: 0～60MPa ; -0.1～2.4MPa
Control Mode: Upper and lower limit slow-action contact switches, or customized according to customer requirements.
Operating Voltage: DC 24V, AC 220V or AC 380V;
Contact Power Rating: 50VA/30W, DC 24V/0.25A
Operating Position: Vertical Installation
Operating Conditions: Ambient temperature of -10 to 50°C, relative humidity not exceeding 80%, and explosive mixtures classified as Group IIB, Temperature Class T4 or lower. Operating vibrations and sudden pressure pulsations of the measured medium must not affect the reliable operation of the instrument contacts.
Temperature Effect: Indication error not exceeding 0.4%/10°C and setpoint error not exceeding 0.6%/10°C (when the operating temperature deviates from 20±5°C).
Dielectric Strength: 2000V, 50Hz sinusoidal AC for one minute.
Weight: 2kg
Types and Basic Parameters of Flameproof Joints
Enclosure Volume V (L) | ＞0.5 |
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Joint Type | Flat Joint | Cylindrical Joint (Moving Part) |
Minimum Effective Length of Flameproof Joint L (mm) | 8 |
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Minimum Effective Length L1 from the Edge of the Screw Clearance Hole to the Flameproof Joint | 7 |
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****** Clearance or Diameter Difference of Flameproof Joint W (mm) | 0.15 |
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Surface Roughness Ra of Flameproof Joint | 3.2 | 1.6 |
Note: Examples of the effective length and clearance width of flameproof joints can be found in the schematic diagram of the flameproof enclosure structure.
Flameproof Enclosure, Pressure Transmission System Components, and Materials
Component Name | Material Grade or Name | Component Name | Material Grade or Name |
Housing and Terminal Box | ZL102 (or ZL-102, ZL-101) |
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Connector | SUS304 |
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Shaft Sleeve | HPb59-1 | Bourdon Tube | SUS316L |
Viewing Window Glass | Tempered Glass |
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Note: The impact resistance of the viewing window material must be at least 4J. The instrument must not be used if the viewing window is damaged.
Structure and Working Principle
The instrument consists of a flameproof enclosure, measuring system, electrical contact assembly, adjustment mechanism, terminal box, and other components. The flameproof enclosure provides reliable explosion protection. During normal operation, if sparks or electrical arcs ignite an explosive gas mixture inside the enclosure, the enclosure can withstand the resulting explosion pressure and effectively prevent the heat generated by the explosion from spreading rapidly to the surrounding environment. The hot gases can only escape slowly through the narrow gaps along the flameproof joints. By the time they reach the outside of the enclosure, their temperature has dropped below the ignition temperature of the surrounding explosive gas mixture, thereby preventing flame propagation and the transmission of an explosion.
The working principle of the instrument is based on the elastic deformation of the sensing element (the Bourdon tube in the measuring system). Through a mechanical transmission mechanism, this deformation drives the contacts in the electrical contact assembly to perform corresponding actions (closing or opening), thereby connecting or disconnecting the circuit in the pressure control system to achieve automatic control, alarm signaling, and on-site pressure indication.