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Trafag AG sensors & controls
H70636e_EN_878X_Hybrid_GDM

H70636e_EN_878X_Hybrid_GDM

Product catalog summary

Overview: The Hybrid Gas Density Monitor 878X by Trafag AG is an advanced device combining mechanical and electronic monitoring for SF6 gas density. It is designed for local switching, read-out, and remote signal capabilities, making it suitable for SF6 gas management systems. The device is compact, maintenance-free, and operates reliably under various environmental conditions.

Key Features:

Combines mechanical and electronic monitoring technologies.
Local switches and remote surveillance capabilities.
Continuous analog signal output for trend analysis.
Maintenance-free with no need for recalibration of switchpoints.
High resistance to vibration and shock.
Complies with international greenhouse gas regulations and IEC 61850 standards.

Operating Principle:

The device uses a bellows system to compare SF6 gas density with a reference chamber, triggering micro switches if density changes.
Temperature-induced pressure changes do not cause false alarms.
An electronic sensor uses quartz oscillators to measure gas density, providing an analog output signal.

Technical Specifications:

Material: Sensor and 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 Degree: IP65.
Service: Check micro switch setpoint every 5 years.

Applications: The monitor is ideal for industries requiring precise SF6 gas density monitoring, such as power utilities and environmental compliance sectors.

Catalog excerpts

Combined technology: local switching / read-out and remote signal Continuous analog signal Ready for SF6 gas management trending systems Very compact all-in-one device Maintenance-free Trafag AG Sensors & Controls tinfaq sensors controls

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Hybrid Gas Density Monitor 878X 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 reliable 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 AND continuous...

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Operating principle of the electronic gas density sensor The constant resonant frequency of a quartz oscillator under vacuum is compared with the resonant frequency of an identical quartz s ituated in the sample gas. The difference in the resonant frequency SF6 gas density is proportional to the density of the sample gas. This difference is processed into an analogue output signal. Functional diagram: Analogue signal output Electrical connections and wiring diagram Δp (SF6) Finit element stress analysis of an oscillation tuning fork ρ Up to three galvanically isolated micro switches actuate...

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Technical data Subject to change H70636e Trafag AG 05/2014 For other available pressure connections: See data sheet www.trafag.com/H72502 tinfacisensors ^^controls

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