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H70661b_879X_Hybrid_Gas_Density_Monitor_RS485_Modbus

H70661b_879X_Hybrid_Gas_Density_Monitor_RS485_Modbus

Product catalog summary

Overview: The document describes the Hybrid Gas Density Monitor 879X RS485/Modbus, a device that combines mechanical and electronic monitoring for SF6 gas density. It is designed for continuous direct measurement of density and temperature, with capabilities for local switching, remote signal read-out, and integration into SF6 gas management systems.

Key Features:

Combines mechanical switches with electronic output for trend analysis.
Maintenance-free operation with no need for recalibration.
High resistance to vibration and shock, and compliant with electromagnetic compatibility standards (EN/IEC 61000-4).
Facilitates compliance with greenhouse gas regulations (EPA, SGCC, F-Gas Regulation).
Compliant with IEC 61850 standards.

Operating Principle: The monitor uses a bellows system to compare SF6 gas density with a reference chamber. Changes in density actuate micro switches, providing alarm signals without false alarms due to temperature-induced pressure changes. An optional SF6 indicator allows visual inspection of gas density as pressure at 20°C.

Technical Specifications:

Material: Sensor and probe housing made from stainless steel (AISI316L, AISI316).
Ambient Temperature Range: -40 to +80°C.
Measuring Range: 0 to 1.1 MPa (mechanical), 0 to 0.85 MPa (electronic).
Accuracy: Micro switch ±10 kPa, sensor ±1.0% FS typical.
Electrical Connection: Pluggable terminal screw connector.
Protection: IP65 rated.
Service: Check micro switch setpoint after 5 years.

Wiring and Connections: The document includes a wiring diagram and details on electrical connections, emphasizing the need for shielded data cables and proper termination with a 120Ω resistor for the first and last device.

Graphical Data: The document provides graphical representations of constant SF6 gas density lines and a functional diagram of the electronic gas density sensor, illustrating the relationship between pressure, temperature, and density.

Catalog excerpts

H70661b_879X_Hybrid_Gas_Density_Monitor_RS485_Modbus-1

Combined technology; local switching / read-out and remote signal Continuous direct density and temperature measurement Bus signal for SF6 density, temperature, pressure and pressure at 20oC Ready for SF^ gas management systems Maintenance-free I trcifciq sensors controls

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H70661b_879X_Hybrid_Gas_Density_Monitor_RS485_Modbus-2

Hybrid Gas Density Monitor 879X RS485/Modbus The Hybrid Gas Density Monitor combines the advantages of the proven mechanical monitor based on the superior reference chamber with the unique electronic gas density sensor. The combined technology has l ocal switches / read-out and allows remote surveillance and trend analysis. The very compact all-in-one- device with a single pressure port operates reliably and maintenance-free under harsh conditions indoors and outdoors. It is accurate over a wide range of temperature and altitude. Advantages No false alarms at low temperatures Mechanical switches...

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H70661b_879X_Hybrid_Gas_Density_Monitor_RS485_Modbus-3

Operating principle of the electronic gas density sensor The constant resonant frequency of a quartz tuning fork under vacuum is compared with the resonant frequency of an identical quartz s ituated in the sample gas. The difference in the resonant frequency Functional diagram is proportional to the density of the sample gas. This difference is processed into an output signal. Finit element stress analysis of an oscillation tuning fork quartz in vacuum Electrical connections and wiring diagram Wiring diagram 879X.XX.XXXX.XX Number of microswitches according to application (max. 3) connect...

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H70661b_879X_Hybrid_Gas_Density_Monitor_RS485_Modbus-4

Technical data Subject to change H7Q661b Trafag AG Q7/2Q13 tinfacisensors ^^controls

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