Installing/Removing An Mvs Module; Configuring A Multi-Drop Mvs Module Setup - Emerson FloBoss 107 Instruction Manual

6.2 Installing/Removing an MVS Module

Caution

6.3 Configuring a Multi-drop MVS Module Setup

Issued Feb-07
The MVS consists of a transducer and an interface circuit. The
transducer, contained in the sensor body, uses capacitance-cell
technology to sense differential pressure and piezo-resistive
technology to sense the static (absolute or gauge) pressure.
The transducer electronics convert the pressure variables directly
into a digital format, allowing accurate correction and
compensation. The FB107 converts the raw temperature into
digital format. A microprocessor linearizes and corrects the raw
pressure signals (from the sensor) using characterization data
stored in non-volatile memory.
The interface circuit allows the MVS to connect to and
communicate with an FB107 using a serial 2-wire EIA-485 (RS-
485) connection.
All FB107 modules are designed for ease of installation and
removal. Refer to Installing a Module, Removing a Module, and
Wiring a Module in Chapter 4, Inputs/Outputs and RTD Inputs,
for specific instructions.
Note: Modules contain no user-serviceable components.
You can install an MVS module in any slot on the FB107 base unit
or expansion rack with the exception of slot 0, which is reserved
for the CPU.
Never connect the sheath surrounding shielded wiring to a signal
ground terminal or to the common terminal of a MVS module
assembly. Doing so makes the MVS module susceptible to static
discharge, which can permanently damage the module. Connect
the shielded wiring sheath only to a suitable earth ground.
To configure a multi-drop MVS setup, connect each MVS to the
FB107 unit one at a time. Ensure that each MVS functions
correctly before installing the next MVS.
There is a possibility of losing the FB107 configuration and
Note:
historical data held in RAM while performing the following
procedure. As a precaution, save the current configuration and
historical data to permanent memory.
Multi-Variable Sensor (MVS)
FloBoss 107 Instruction Manual
6-3