Chapter 6 - Dual-Variable Sensor (Dvs); Dual-Variable Sensor - Emerson FloBoss 103 Instruction Manual

Chapter 6 – Dual-Variable Sensor (DVS)
In This Chapter

6.1 Dual-Variable Sensor

Revised August-2017
6.1 Dual-Variable Sensor ....................................................................... 6-1
6.1.1 Making Process Connections ............................................... 6-2
6.1.2 Configuring the DVS ............................................................. 6-2
This chapter describes the Dual-Variable Sensor (DVS), which provides
differential pressure and static pressure inputs to the FB103 for orifice
flow calculation. The DVS is not equipped to provide a temperature
input to the FB103; this input comes directly into the FB103 through the
RTD input on the termination board.
: Refer to technical specification DVS205 (part number
Note
D301569X012, available at www.EmersonProcess.com/Remote)
for most-current information on the Dual Variable Sensor.
The DVS, which uses Rosemount sensor technology, measures
differential pressure and absolute or gauge (static) pressure by
converting the applied pressure to electrical signals and making the
readings available to the processor board. The DVS is factory installed
to the bottom of the FB103 enclosure.
: The Dual Variable Sensor has no user-serviceable parts. It can
Note
only be factory-installed or removed. Additionally, the DVS
cable plugs directly in to the FB103 backplane board, and is only
a factory-serviceable part.
The FB103 stores DVS readings as analog inputs. If you enable the
alarm for the AI point and the DVS fails to communicate during either
initialization or operation, an alarm is entered in the Alarm Log.
The DVS uses an interrupt to inform the processor board that it is ready
for an update. This must occur at least once per second. The FB103 then
converts this value and stores it in the proper analog input for access by
other functions within the unit. If an update does not occur in the one-
second interval, the sensor is re-initialized. A point fail alarm is set if
the DVS does not respond to the initialization.
Pressure sensors screw into the DVS housing and provide the
measurement of the static pressure and the differential pressure for
orifice plate flow measurement applications.
For information on calibrating a DVS sensor, refer to Chapter 8.
Dual-Variable Sensor
FloBoss 103/104 Instruction Manual
6-1