HART Communication for 640S/ 780S

Sierra is pleased to announce the release of a limited version of HART communications protocol for our Steel-Mass 640S and Flat-Trak 780S. Because of the physical layout of the PCA’s used, HART is limited to

• E2 Enclosure only

• P2 (24 VDC) power only

• NAA (non-agency approval) only

This HART is READ ONLY for the following variables:

• Instantaneous flow

• Totalized flow

• User Full Scale

• K factor

Flow units are grams, kilograms or pounds per second/minutes/hour (g, kg, lb per s, m, H). No other units are currently possible.

We realize this is a very limited implementation of HART, but this is meant only as a stop-gap measure using off-the-shelf components to allow the use of our current 640S/780S line in certain applications. We have similar limited solutions for Profibus PA and Foundation Fieldbus (PB and FF in the 2010 price list).

In the meantime, we continue to develop true HART, Fieldbus, Profibus PA, DeviceNet and other digital communications with full device descriptions for our upcoming next generation QuadraTherm 640i & 780i immersible thermal line and our Smart Trak 2 – 100 Series line of digital mass flow meters and controllers.

HART is available now. To order use “-HART” at the end of the model code. The price is a $160 adder. Again, please keep in mind, the limitations on configuration and units as described above.