PN25080
Converter 4 - 1
TRIO-WIRL INSTRUCTION MANUAL
CHAPTER 4 Converter
4.1 General
The TRIO-WIRL flow metering system is designed as a
2-wire instrument, i.e. the supply power and the current
output signal (4-20 mA) both use the same pair of con-
nection leads.
Two converter mounting versions are available, integral
( models ST/VT) and remote (models SR/VR).
INTEGRAL
The TRIO-WIRL VT/ST models are supplied with an
integrally mounted microprocessor-based signal con-
verter as shown in Figure
. The converter uses
state-of-the-art Digital Signal Processor (DSP) technol-
ogy for superior flow and vibration noise immunity. This
combination of flowmeter and electronics allows maxi-
mum flexibility for on-site calibration and maintenance.
Database interrogations and changes at the flowmeter
may be performed using the three pushbuttons or by
activating three magnetic switches using a magnetic
"stick". The two line, 16 character LCD display permits
continuous monitoring of the flow rate and totalizer
using multiplexing, if desired.
REMOTE
The TRIO-WIRL VR/SR models (Figure
) are based
on the VT/ST converter technology and include all the
options available in the VT/ST models. The difference
is that the converter is mounted remotely from the flow-
meter primary when the primary is installed in a loca-
tion difficult to access. The converter may be either
wall-mounted or pipe-mounted (pipe-mounting hard-
ware is shown in Figure
).The remote design also
offers advantages when the ambient conditions at the
flowmeter primary are extreme. The maximum distance
between the converter and the flowmeter primary is 10
meters. A special cable is supplied with the meter to
interconnect the flowmeter primary and the converter
and is permanently attached to the converter.
FIGURE 4-1 INTEGRAL TRIO-WIRL MODEL VT
.
FIGURE 4-2 REMOTE TRIO-WIRL MODEL VR
FIGURE 4-3 VR/SR PIPE-MOUNT BRACKET
