Download Aurora Trace Moisture Analyzer User Manual 6 MB

Appendix B. Using Aurora TRACE with Foundation Fieldbus
Appendix B.Using Aurora TRACE with Foundation Fieldbus
B.1 Introduction
Foundation Fieldbus (FF) connectivity is available as an option for the Aurora TRACE. This option permits monitoring
Moisture, Temperature, and Pressure readings made by the Aurora TRACE, as well as essential diagnostic values via a
two-wire, intrinsically safe, Foundation H1 connection.
B.2 Capabilities
The Aurora TRACE provides four (4) Analog In (AI) function blocks. Two AI blocks are reserved for moisture
measurements. One AI is reserved for temperature measurements, and one AI is reserved for pressure measurements.
Standard Transducer (TB) and Resource (RB) function blocks are also included.
Aurora TRACE can publish moisture, temperature, and pressure in any measurement unit already provided.
Complete fault/warning status is provided, simplifying troubleshooting. The Aurora TRACE alarm status is available,
expanding on the alarm capabilities included with Foundation Fieldbus.
For systems so equipped, control and status of the Aurora Verifier is available.
The Aurora TRACE provides a terminal block in the increased safety compartment for the H1 Fieldbus connection.
The Aurora TRACE automatically detects when the Fieldbus option is installed, and can verify the presence of an
active fieldbus.
B.3 Compatibility
The Aurora TRACE Fieldbus implementation was developed in cooperation with Softing AG, widely recognized as an
industry leader in Foundation Fieldbus. Interoperability is assured by compliance with the Foundation Interoperability
Test Kit (ITK) 5.0.
A standard set of Device Description / Capabilities files is available from GE or from the Fieldbus Foundation web site
at http://www.fieldbus.org .
B.4 Wiring
Suitable twisted-pair cable should be used to connect the Aurora TRACE to the fieldbus. GE recommends that the
cable comply with Foundation specification FF-844. At a minimum, the cable must meet the following specifications:
•
Shielded twisted pair (18 AWG minimum)
•
Maximum resistance of 23.5Ω/km @ 20°C
•
Characteristic Impedance of 100Ω +/- 20Ω @ 31.25 kHz
•
Signal Attenuation < 3 dB/km @ 39 kHz
Aurora Trace High Definition Laser Absorption Spectroscopy Moisture Analyzer User’s Manual
141