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ZMJ100XD Density Monitor

ZMJ100XD 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 density reaches the set values . They are designed to monitor High Voltage systems. They can provide multi- ple solutions to support new substations and the reno- vation and upgrading of existing substations

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SF₆ Gas Insulated Switchgear (GIS)
SF₆ Insulated Circuit Breakers
SF₆ Insulated Pole-Mounted Switch
SF₆ Insulated Transformers
SF₆ Insulated Current Transformers or Voltage Transformers
SF₆ Insulated Busbar Systems

Higher accuracy from reference chamber tempera- ture compensation technology .
Class 1.0 display accuracy for full scale range.
Suitable for indoor or outdoor installation.
More accurate gauge indication values and contact switching values throughout the temperature range.
Micro-switch that can switch freely between normal- ly open and normally closed points.
Up to 4 sets of switch contacts, multiple options such as double alarms and double locks can be realized, making monitoring more secure and reliable.
High shock resistance. No need to fill oil, no oil leak- age hazard.
Normally closed contacts will not falsely alarm due to vibration.

Scale range	-0.1 ～ 0.9MPa (customizable)
Accuracy of set point	±1.0%FS(+20±1℃ ) ±1.6%FS（-30℃~ +60℃)（gas phase）
Accuracy of indication	Rated pressure：±1.0%FS（+20±1℃) ±1.8%FS（-20℃~ +60℃)（gas phase） ±2.3%FS（-30℃~ -20℃)（gas phase）
Degree of protection	IP65
Ambient conditions	-20° C ～ +60° C, relative humidity ≤ 95%RH
Leakage rate	≤ 1×10-9 Pa·m3/s (Helium leakage inspection)
Process connection	M20×1.5, (customizable)
Installation method	Radial or Axial
Electrical connection	Pluggable seven-pin connector
Insulation properties	Insulation resistance: >100 MΩ (DC 500V) Withstand voltage: 2kV, 50/60 Hz,1min
Contact type	Micro switch
Impact rating	50g
Contact ratings	10(1.5)A,250V AC 0.1 (0.05)A,250V DC
Window Glass	Laminated safety glass
Weight	≈ 1.0kg
Pressure element	Bellow and Bourdon Tube

Different measuring ranges
Wide temperature range:Optional-40° C ～ +70° C
Measuring medium：SF₆、Air、N₂、SF₆+N₂ and other gases

Purpose and Specific Content of SF6 Gas Density Monitoring

SF6 Gas Density Monitoring Ensures Safe Operation of Equipment
Gas density monitoring primarily aims to ensure the safe operation of electrical equipment. The insulating performance of SF6 gas is closely related to its density. When the gas density decreases, its insulating performance also declines, increasing the risk of equipment failure. Through regular gas density monitoring, gas leaks or other abnormalities can be promptly detected, preventing accidents caused by insulation failure.
Besides monitoring equipment status, gas density monitoring also safeguards the safety of personnel. A leak of SF6 gas under high-pressure conditions can produce harmful decomposition products, posing health risks to operators. Therefore, timely monitoring of gas density not only helps protect equipment but also provides health assurance for on-site staff.

The Specifics of SF6 Gas Density Monitoring
When conducting gas density monitoring, several key points must be addressed to ensure comprehensive and effective monitoring.
Gas mass concentration detection
Gas mass concentration monitoring is an important component of gas density monitoring. With professional detection equipment, the concentration level of SF6 gas in the environment can be accurately determined. Equipment can only operate safely under normal concentration levels.
Leak detection
Leak detection is also a crucial part of gas density monitoring. The monitoring system regularly checks for gas leakage points in the equipment. If leaks are found, personnel must maintain a safe distance and avoid entering the leak area until the issue is resolved and it is safe to re-enter.
Regular inspections and specialized instruments
Regular inspections are essential to ensure the effectiveness of gas density monitoring. During inspections, professional equipment such as SF6 leak detectors and gas mass concentration detectors are used to ensure the accuracy of monitoring data. Additionally, regular inspections performed by experienced professionals help identify potential problems in a timely manner.
During gas density detection, operators must receive professional training and strictly adhere to the operating guidelines of the instruments and equipment to ensure the safety and accuracy of the detection process. Moreover, the detection environment must meet standard requirements to eliminate external factors that could interfere with the detection results.
If anomalies are detected, immediate measures must be taken to address them. For example, leak sealing and natural ventilation methods can be employed to reduce gas concentration. Furthermore, recording detection results and establishing detection archives is crucial for subsequent analysis and continuous improvement.
In a short, SF6 gas density monitoring plays a pivotal role in high-voltage electrical equipment. Through regular gas density monitoring, not only can the safe operation of equipment be ensured, but it also protects the health and safety of personnel. Therefore, enterprises should prioritize the implementation of gas density monitoring, employing scientific and reasonable methods to keep equipment in optimal condition, ensuring the stable operation of power systems.