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ZMJ80XDR Density Monitor

ZMJ80XDR Density Monitors are used to monitor SF<sub>6</sub> 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 SF<sub>6</sub> 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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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 normal- ly open and normally closed points.
Up to 3 set of contacts, multiple options such as dou- ble alarm and double lock, safer and more reliable monitoring.
High shock resistance. No need to fill oil, no potential 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.
±1%FS display in full range, higher remote transmis- sion module accuracy, higher indication and remote data consistency accuracy.
More accurate gauge indication values and contact switching values throughout the temperature range.

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

Scale range	-0.1 ~ 0.9MPa
Accuracy of set pressure point	±1.0%FS（+20±1℃) ±1.6%FS（-30℃~ +60℃)（gas）
Accuracy of indication	±1.0%FS（+20±1℃) ±1.8%FS（-20℃~ +60℃)（gas） ±2.3%FS（-30℃~ -20℃)（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 detection)
Process connection	M20×1.5, (customizable)
Installation method	Radial or axial
Electrical connection	Contact connection: pluggable connector, wire diameter 0.2 ~ 2.5 mm2 Remote connection: pluggable connector, wire diameter 0.2 ~ 1.5 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
Window glass	Laminated safety glass
Weight	≈ 1.4kg
Pressure element	Bellow and Bourdon Tube

Different measuring range
Measuring Medium: SF₆, Air, N₂, SF₆+N₂ and other gases
Operating temperature: Optional -40℃ ~ +60℃

SF6 Gas Density Monitor: Protecting the Safety of Staff

Functions of SF6 Gas Density Monitor
The primary task of the SF6 gas density monitor is to detect the concentration of SF6 gas and oxygen content in the ambient air. Once it detects that the SF6 gas concentration in the environment exceeds the standard or there is a lack of oxygen, the system will immediately issue an alarm and automatically turn on the fan for ventilation to ensure the life safety of the staff. This monitor has micro detection technology for SF6 gas, capable of detecting SF6 gas at a concentration of 1000ppm. Such high-precision detection capability can effectively protect the personal safety of staff and ensure the normal operation of the equipment. Additionally, the monitor is equipped with imported oxygen sensors, providing an extra layer of reliable protection for on-site staff.
In addition to gas detection and alarm functions, the SF6 gas density monitor also features temperature and humidity detection, working status voice prompts, remote alarm, historical data query, and other rich functions. The integration of these functions enables the system to fully and accurately monitor environmental conditions, providing multi-faceted safety protection for the staff.
The SF6 gas density monitor is mainly applied in SF6 enclosed switchgear rooms of substations at 110kV, 220kV, 500kV, and high-voltage switchgear rooms of 10KV and 35KV. In these environments, SF6 gas leakage is an issue that cannot be ignored. By real-time online monitoring of the SF6 gas leakage and the oxygen content in the air, the monitor can promptly identify potential dangers and prevent accidents.

Detection Principles of SF6 Gas Density Monitor
The SF6 gas density monitor is an instrument for detecting and monitoring the presence and concentration of sulfur hexafluoride (SF6) gas in the environment. Its detection principles are primarily based on the following aspects:
·Infrared Absorption Method
SF6 gas has specific infrared absorption lines, and it has different degrees of absorption ability for infrared radiation in different wavelength ranges. By using an infrared sensor, the remaining intensity of infrared radiation after being absorbed by SF6 gas can be detected, thereby determining its presence and concentration.
·Ion Mobility Method
Utilizing the relationship between ion mobility and SF6 gas concentration, the presence and concentration of SF6 gas can be inferred by the distance ions move in space under the action of an electric field. This method requires ion mobility devices and related analysis means.
·Chromatography
The collected samples are separated through a chromatographic column, and the separated substances are qualitatively and quantitatively analyzed through a detector. This method requires corresponding chromatographic equipment and is relatively complex to operate.
·Electrochemical Sensor Method
Using the principle that special electrodes react with SF6 gas to produce changes in current or potential for detection. The presence and concentration of SF6 gas can be determined based on the changes in current or potential. It should be noted that different types of SF6 gas density monitors may use different detection principles. Choosing the detection principle that suits your needs and actual application scenarios is key to ensuring accurate monitoring and analysis of SF6 gas.
The SF6 Gas Density Monitor is an important safety protection device in the power system. Its application not only can protect the life safety of staff but also ensure the stable operation of the power system. In the future, we look forward to such systems being applied in more fields, providing safer protection for human life and work.