Emerson FloBoss 103, Инструкция по эксплуатации

Страница: 68 / 106

FloBoss 103/104 Instruction Manual
6-2 Dual-Variable Sensor Revised August-2017
Note
:
Consult your local sales representative for special ranges.
6.1.1 Making Process Connections
Piping from the meter run connects to the DVS. Both the static and
differential pressure sensors connect to female ¼-18 NPT connections
on the bottom of the DVS.
Note
:
The FloBoss is an upstream device, meaning that the static
pressure line normally connects to the high pressure side on the
sensor body (labeled “H”).
Caution
Open the by-pass valve on the valve manifold prior to isolate the sensor
from the process and to protect the differential cell of the DVS. This
keeps one side of the differential sensor from being subjected to high
pressure while the other side has no pressure applied. This is required
when calibrating either differential or static pressure. Refer to Chapter 8
for the recommended sequence.
Do NOT close the by-pass valve on the valve manifold until after
process pressure has been reapplied, to protect the differential cell of
the Dual-Variable Sensor. This keeps one side of the differential sensor
from being subjected to high pressure while the other side has no
pressure applied. Refer to Chapter 8 for the recommended sequence.
6.1.2 Configuring the DVS
Use ROCLINK 800 configuration software to configure the DVS.
•
Configure the differential pressure as analog input point number A1.
•
Configure the static pressure (gauge or absolute) is configured as
analog input point number A2.
You configure analog input points A1-A4 for fault mode operation
using the Advanced tab of the ROCLINK 800 Analog Input Setup
screen. The setting of the Action on Failure field determines whether the
FB103 should hold the last known value or set to a specified fault value.
The initial pressures read are the defaults contained within the DVS.
Refer to the technical specifications for the DVS205 for the initial range
of the differential pressure and the static pressure. You can re-range
each sensor through the calibration routines. The turndown on the range
should not be greater than the turndown value listed in the technical
specifications document.
The DVS also supports the conversion of values to metric units. In
metric mode, both the differential pressure and the static pressure are in
kPa. To enter metric mode, use ROCLINK 800. The FB103
automatically adjusts the units of the differential pressure, static