*mydirectindustry

Catalogs
Trafag AG sensors & controls
H70664b_8775_Gas_Density_Sensor_RS485_Modbus

H70664b_8775_Gas_Density_Sensor_RS485_Modbus

Product catalog summary

Overview: The document provides technical specifications and operational details for the Trafag Gas Density Sensor 8775, designed for monitoring insulation gases like SF6. It features a unique quartz tuning fork technology for accurate density measurement.

Specifications:

Continuous digital output via RS485/Modbus for density and temperature.
Compliant with IEC61850 standards.
Wide density range: 0-10 bar SF6-pressure at 20°C.
Electromagnetic compatibility according to EN/IEC 61000-4.
Operating temperature range: -40 to +80°C.
Accuracy: ±1.0% FS for density, ±1.0% FS for temperature.
Degree of protection: IP65.
Output signal: RS485/Modbus (RTU).
Supply voltage: 10-32 VDC.

Operating Principle: The sensor uses a quartz oscillator under vacuum compared to another in the sample gas. The frequency difference, proportional to gas density, is converted into a digital signal, ensuring high accuracy and stability.

Advantages:

Maintenance-free and drift-free signal.
Facilitates compliance with greenhouse gas regulations.
Suitable for outdoor applications without additional protection.

Technical Data:

Resolution: 13-bit for density, 10-bit for temperature.
Reaction time: < 500 ms.
Humidity tolerance: 98% relative at 55°C.
Vibration resistance: 15 g, 5-2000 Hz.
Shock resistance: 100 g / 6 ms.

Connections: The sensor includes a wiring diagram with a shielded data cable and specific pin assignments for data and power connections.

Catalog excerpts

H70664b_8775_Gas_Density_Sensor_RS485_Modbus-1

Continuous density and temperature measurement Digital output signal RS485 Modbus for density, pressure and temperature Compliant with IEC61850 Extremely drift-free signal Maintenance-free trcifciq sensors controls

Open the catalog to page 1

H70664b_8775_Gas_Density_Sensor_RS485_Modbus-2

Gas Density Sensor 8775 RS485/Modbus Unique electronic SF6 gas density monitoring with quartz tuning fork The Trafag gas density sensor type 8775 was specifically designed for the monitoring of insulation gases. This unique patented sensor technology opens new paths for the energy distributing industry to realize comprehensive trend analysis and monitoring. The digital output signal RS485/Modbus measures directly and continuously the gas density and the signal of the gas temperature. Advantages Continuous digital output signal RS485/Modbus usable for SF6 trend analysis Compliant with IEC61850...

Open the catalog to page 2

H70664b_8775_Gas_Density_Sensor_RS485_Modbus-3

Technical data Gas Density Sensor 8775 Principle Oscillating quartz measurement Material pressure connection Material tube Reaction time RS485 interface Operating & Media temperature –40 ... +80 °C Measuring range Output signal Supply voltage Electrical connections and wiring diagram Plug M12x1 data cable, shielded AWG26, twisted pair, 100Ω impedance 5 ﬁrst and last device (120Ω) DC DC optocoupler microprocessor /RS485 driver

Open the catalog to page 3

H70664b_8775_Gas_Density_Sensor_RS485_Modbus-4

A (Data—) B (Data+) GND Shield on cable For other available pressure connections: See data sheet www.trafag.com/H72502 Subject to change H70664b Trafag AG 10 /2013

Open the catalog to page 4

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.

Brand list