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H70649a

Product catalog summary

Overview
The document provides detailed information about the Trafag SF6 Gas Density Sensor, specifically the type 8774, which is designed for monitoring insulation gases. This sensor offers both digital and analogue output signals, making it suitable for SF6 trend analysis and monitoring.

Specifications

Continuous digital or analogue output signal for SF6 trend analysis.
Wide density range with additional output of sensor temperature in the digital version.
Extremely drift-free signal suitable for outdoor applications without additional protection.
Electromagnetic compatibility (EMC) according to EN/IEC 61000-4.
Density measurement of all gases is possible, facilitating compliance with greenhouse gas regulations.

Operating Principle
The sensor uses a unique electronic monitoring system with a quartz tuning fork. It compares the resonant frequency of a quartz oscillator under vacuum with that of an identical quartz in the sample gas. The frequency difference, proportional to the gas density, is processed into an analogue or digital output signal. The digital variant also measures temperature using the pulse width of the frequency signal.

Technical Data

Measurement principle: Oscillating quartz measurement.
Material: Pressure connection made of 1.4435 (AISI316L), tube made of 1.4301.
Operating and media temperature range: -40 to +70 °C.
Measuring range: 0 to 0.85 MPa / 0 to 60 kg SF6/m3.
Accuracy: ±1.0% FS typical, ±1.8% FS maximum.
Degree of protection: IP65.
Vibration resistance: 15 g (max. 6 mm), 5 to 2000 Hz.
Shock resistance: 100 g / 6 ms.
Weight: Approximately 200–400 g.

Advantages

Facilitates compliance with greenhouse gas regulations.
Suitable for outdoor applications without additional protection.
Extremely drift-free signal ensures reliable monitoring.

Conclusion
The Trafag SF6 Gas Density Sensor 8774 is a robust and reliable solution for monitoring insulation gases, offering precise measurements and facilitating compliance with environmental regulations.

Catalog excerpts

SF6 GAS DENSITY SENSOR Unique electronic SF6 gas density monitoring Continuous digital or analogue output signal Usable for SF6 trend analysis Wide density range Additional output of sensor temperature (digital version) Extremely drift free signal Outdoor application without additional protection Trafag AG Sensors & Controls www.trafag.com [email protected]

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Trafag Gas Density Sensor 8774 Unique electronic SF6 gas density monitoring with quarz tuning fork The Trafag gas density sensor type 8774 was specifically designed for monitoring insulation gases. This unique patented sensor technology opens new paths for the energy distributing industry to realize comprehensive trend analysis and monitoring. It measures directly and continuously the gas density providing an analogue or digital output signal. The version with digital output signal also provides the signal of the gas temperature. Advantages Continuous digital or analogue output signal usable...

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Leading companies trust in Trafag's superior knowledge Subject to change H70649a Trafag AG 10/2011 SIEMENS SIEYUAN

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All Trafag AG sensors & controls catalogs and technical brochures

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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