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ZMJ60XDR Density Monitor

ZMJ60XDR Density Monitors are used to monitor SF₆ gas density in sealed tanks. They are applied to indicate the gas density and to provide signal outputs when the den- sity reaches the set values. Furthermore, it can transmit the real-time SF₆ gas density data remotely, to achieve online remote monitoring function. They are designed to monitor High Voltage systems. They can provide mul- tiple solutions to support new substations and the reno- vation and upgrading of existing substations.

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Technical Data

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Others

SF₆ Gas Insulated Swithchgear (GIS)
SF₆ Insulated Circuit Breaker
SF₆ Insulated Pole-Mounted Switch
SF₆ Insulated Transformer
SF₆ Insulation Current Transformers or Voltage Transformers
SF₆ Insulated Bus System

Higher accuracy from reference chamber tempera- ture compensation technology.
Suitable for indoor or outdoor installation.
Micro-switch that can switch freely between nor- mally open and normally closed points.
Up to 4 pairs of switches, multiple options such as double alarms and double locks can be realized, making monitoring more secure and reliable.
High shock resistance, reducing need for oil and the potential hazard of oil leakage.
Normally closed contact will not false alarm due to vibration.
RS485 bus interface, easy to expand current system for telemetry and remote control functions.
Strong EMC capability.

Technical Parameters for Remote Module

Operating voltage	10~30VDC	EMC tests	IEC61000-4-2: Level 4 IEC61000-4-3: Level 3 IEC61000-4-4: Level 4 IEC61000-4-5: Level 4 IEC61000-4-6: Level 3 IEC61000-4-8: Level 5 IEC61000-4-9: Level 5 IEC61000-4-10: Level 5
Power consumption	<0.5W
Communication mode	RS485
Communication protocol	Modbus RTU
Baud rate	9600bps

Technical parameters

Technical parameters
Scale range	-0.1 ~ 0.9MPa
Accuracy of set pressure point	±10 kPa @ –30 ～ +60 ° C（gas）
Accuracy of indication	±10 kPa @ –30 ～ +60 ° C（gas）
Accuracy of transmitter	Pressure：±0.5%FS Temperature：±1℃ Pressure at 20℃: ±1.0%FS
Degree of protection	IP65
Ambient condition	-30℃ ~ +60℃ , relative humidity：≤ 95%RH
Leakage rate	≤ 1×10-9 Pa-m3/s (Helium leak inspection)
Process connection	M20 x 1.5 (customizable)
Installation method	Radial or Axial
Electrical connection	Pluggable connector, wire diameter 0.2~2.5 mm2
Insulation property(contact part)	Insulation resistance: >100MΩ (DC500V) Withstand voltage: 2kV, 50/60Hz, 1min
Contact type	Microswitch
Impact rating	50g
Contact electrical parameters	10(1.5)A, 250V AC 0.1(0.05)A, 250V DC
Watch glass	Laminated safety glass
Weight	≈ 1.2kg
Pressure element	Bellow

Pressure connections: customizable
Nominal diameter: customizable

Application of SF6 Gas Density Monitors in the Power Industry

Industry Background
Sulfur hexafluoride (SF6) gas is widely used as an insulating gas in the power industry due to its excellent properties such as high insulation performance, high electrical strength, and chemical stability. It is commonly used in high-voltage switches, isolators, circuit breakers, and other power equipment to ensure these devices can operate safely and reliably under normal and abnormal conditions.
However, with the widespread use of SF6 gas, leakage issues have become increasingly prominent, emerging as a latent killer in the power industry. SF6 gas leakage can not only lead to power equipment failures but also pose threats to the environment and personnel safety. Consequently, the power industry has imposed higher demands on equipment maintenance and fault prevention. The installation and use of SF6 gas density monitors have become particularly important. SF6 gas density monitors can monitor the density of SF6 gas in real-time, helping operators timely detect potential safety hazards.

The Role of SF6 Gas Density Relays
·Equipment Maintenance
Traditional equipment maintenance methods often rely on manual inspections and experiential judgments, making it difficult to accurately determine the operating status of equipment. Remote SF6 gas density monitors can monitor the equipment's operating status in real-time, promptly detect abnormal SF6 gas pressures, upload the data to an online monitoring platform, and issue warnings. This provides robust data support for equipment maintenance, thereby improving the efficiency and accuracy of maintenance.
·Fault Prevention
The stable operation of the power system is crucial to the normal development of the socio-economy. By installing SF6 gas density monitors, the power industry can timely discover precursors of equipment failures, such as abnormal increases or decreases in SF6 gas pressure, thereby taking preventive measures to avoid equipment damage from affecting the power system, ensuring the safe and reliable supply of electricity.
·Personnel Safety Protection
Toxic and harmful gases produced from the decomposition of SF6 gas can pose threats to the health of operational personnel. By installing SF6 gas density monitors, the power industry can timely detect and manage SF6 gas leaks, ensuring the safety of staff members.
In conclusion, SF6 gas density monitors adopt sensitive actuation methods, such as micro-switches, characterized by fast response speeds, good repeatability, and resistance to environmental interference. Additionally, SF6 gas density monitors offer high precision, ease of operation, and long service life, meeting the power industry's demands for real-time monitoring and long-term stable operation.