Sentry G3 machinery monitoring and protection system

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Sentry G3 machinery monitoring and protection systemSensonics describes its upgraded Sentry G3 machinery monitoring and protection module as a high-performance signal conditioning unit with a universal sensor interface in compliance with the API 670 standard. The latest Sentry G3 systems encompass vibration, position, speed and temperature measurements, and the hardware fault tolerance for these devices has been independently verified.

Channel hardware independence is important for machinery protection applications where a failure of any hardware assembly should have a minimal effect on the overall system measurement integrity - and in this respect the Sentry G3 is claimed to be the 'best-in-class'.

The four-channel G3 module has been designed with an independent digital signal processor (DSP) for each measurement channel. Each DSP can be loaded with the specific measurement algorithm that not only controls the sensor selection, but also the protection relay status and analogue output levels. This provides complete hardware autonomy from the sensor through to the protection relay, combined with high channel density (24 channels in a 3U format).

Each module has an integral intuitive colour LCD display and drive facility that provides immediate viewing and access to the machine's parameters. Several modes of display are available to suit different applications, such as an alarm historian and parameter trending per channel. It also provides the necessary power source for the selected transducer, providing for two- (ICP type) or three-wire accelerometer variants, +/-24V proximity probe systems, LVDTs and a variety of speed and temperature sensors. Each transducer signal is buffered and available via the front panel analogue connection arrangement, while a USB interface is provided for programming the module and for storage of channel history and settings.

The G3 system offers excellent channel density with up to 24 measurement channels in a 3U format; in addition, each channel can provide independent analogue outputs for current and voltage for connection to a DCS, as well as an alarm relay. Further alarm relay expansion is possible through connection to digital outputs at the rear of the module.

Sensonics says that the Sentry G3 provides state-of-the-art protection for the following modes:

Measurement - Absolute and relative vibration, displacement and thrust, position, speed, phase and reverse rotation, differential and casing expansion, rod drop and temperature.

Turbine Specialist Measurement - Shaft eccentricity, mark-space differential expansion, rotor, stator air gap.

Flexible Configuration – LPF, HPF, tracking and notch filters, programmable warning and danger alarms, cross-channel voting, FTT, harmonic and phase analysis, programmable transducer supply, scalable module hardware with plug-in DSP card, up to four channels, dual redundant power supply, gateway communications module, USB programmable, defeat, park and calibration modes.

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