Langsongkeli (Shanghai) Instrument Co., Ltd
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ZMJ100PR type remote transmission density relay
Used to monitor the density of SF6 gas in sealed containers, it can display the gas density on site and alarm when the density value reaches the set v
Product details


Used for monitoring sealed containersSF6The density of gas can be displayed on site, and an alarm will be triggered when the density value reaches the set value, with real-time remote transmissionSF6Gas density data, realizing online remote monitoring function. Suitable for monitoring high-voltage systems. We can provide various solutions such as supporting new substations and intelligent transformation of existing substations.



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1. Equipped with temperature compensation device for higher measurement accuracy

2. The perfect combination of mechanics and electronics, on-site indication and control of instruments. Adopting precision mechanical structure and possessing real-time remote transmission function of electronic signals

3. RS485Bus interface, easy system expansion, convenient for implementing telemetry and remote control functions. Strong ability to resist electromagnetic interference

4. Suitable for different installation needs indoors and outdoors

5. selectAISI 304Stainless steel made sealed case

6. selectAISI 316Stainless steel made pneumatic connection components

7. The on-site display values and output signals are not affected by external factors such as altitude

8. at mostfourDocking point, multiple options such as overpressure alarm, dual alarm or dual locking can be implemented, making monitoring safer and more reliable


1. Shell diameter:100mm

2. Measurement range:-0.1 ~ 0.9MPa(Customizable)

3. Measurement accuracy: (depends on the measurement range, andSF6For gaseous state

a)20°C: 1.0level,perhaps1.5level

b)-40°C ~ +60°C: 2.5level

4. Protection level:IP65

5. Working temperature: -40°C~ +60°C,relative humidity≤ 95%RH

6. Leakage rate:1×10-9Pa·m3/s (Helium leak detection)

7. Interface size:M20×1.5(Can)Customized)

8. Installation method: radial or axial

9. Electrical connection: plug-in connectionM20×1.5Sealing head

Cable size: recommended1.5mm2,maximum2.5mm2

10. Insulation performance: Insulation resistance:>100 MW(DC 500V)

Power frequency withstand voltage:2kV50/ 60 Hz 1min

11. Contact type: Magnetic assisted electric contact switch

80%Silver20%Nickel,10µmgold-plating

12. Impact level:50g (Oil filled type), 30g(Non oil filled type)

13. Contact electrical parameters:30W/ 50VA, 1A.(Maximum)

220VDC/ 380V 50/ 60Hz(maximum)

14. Table glass: multi-layer safety glass

15. Weight: 1.2kg

16. Pressure sensing component: imported Burton tube

Main electrical performance indicators and specifications for remote transmission

lWorking voltage:DC 24V

lpower waste:<>

lCommunication method:RS485

lCommunication protocol:ModBus RTU

lTransmission speed:9600bps

lanti-electromagnetic interferenceIEC61000-4-24level(15kV)

IEC61000-4-33level(10V/m)

IEC61000-4-44level(4kV)

IEC61000-4-53Grade(+/-2kV

IEC61000-4-63Grade(10V

IEC61000-4-85Grade(100A/m


power-frequency withstand voltage2.5kV 50/60 Hz 1min

Refillable oil

Measurement mediumSF6AirN2SF6+N2Waiting for gas



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