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Introduction
1.1 ABOUT THE 7828 DENSITY TRANSMITTER
1.1.1 WHAT IS IT?
The 7828 Density Transmitter is based on Solartron's proven tuning fork technology. It is
an all-welded sensor designed to be mounted directly in-line or into a tank. Density is
determined directly from the resonant frequency of the tuning fork immersed in the fluid,
and a temperature sensor (PRT) is also fitted within the transmitter.
The transmitter contains integral processing electronics to provide full ‘on node’
configuration, enabling it to perform a variety of calculations. Two outputs are available:
1. A direct 4-20mA output giving an output proportional to a user selected process
parameter or calculation result, with configurable span, bias, limits and filter
options:
•= line density
•= line temperature
•= °API
•= S.G.
•= base density (API)
•= base density (Solartron matrix method)
•= special calculation result.
2. An RS485(Modbus) interface, giving access to other measurement results,
system information and configuration parameters.
No signal converter is required, which simplifies wiring and enables the 7828 to be
connected directly to a plant monitoring and control systems and/or a local indicator.
The 7828 is factory set to perform either API or Matrix referrals. Re-configuration of the
7828’s default settings (see Appendix A) is achieved by linking a PC to the Modbus
(RS485) connection and running Solartron's ADView software. Once configured, the PC
can be removed.
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