Chapter 1.
INTRODUCTION
■
Introduction
The
MVF Series
Micro Flow Vortex Gas Flowmeter (hereafter called "the device"
or "the
MVF
") is a thermal vortex gas flowmeter featuring a wide measurement
range. It uses the Yamatake-designed Micro Flow sensor (or "µF sensor") as a vor-
tex generator.
■
Features
• 35% more of the
MVF
's component materials are available for re-use or recy-
cling, as compared with the conventional
CMK
model.
• Temperature and pressure compensation functions are integrated into the
MVF
.
Since expensive temperature and pressure compensation devices are not
required, a large cost reduction can be expected.
• This device incorporates a µF (Micro Flow) sensor a mere 1.7mm square and
0.5mm thick, made possible by silicon micro-machining and thin-film technolo-
gies. By using this high-sensitivity, high-speed sensor to detect vortex frequen-
cy, measurement rangeability of 100:1 has been achieved.
• The entire
MVF
is provided with wide range of functions to meet various appli-
cations needs: LCD display function, analog output (4 to 20mA), integrating
calculation, display and integral pulse output (open collector).
Also, an RS-485 communications function is provided as a standard feature, so
a large amount of instrumentation cost reduction can be achieved when data is
uploaded.
■
System
LOADER
power
SD
RD
SD
RD
H
O
S
T
C
M
C
C
M
C
L
O
C
A
L
C
M
C
A
D
D
R
E
S
S
HOST CMC
B.RATE
ERR
RESET
CMC10
11
12
13
14
15
Communications (RS-485)
CMC10L
PLC
Smart terminal
EST-Z series
Pulse output
4 to 20mA
instantaneous flow rate
output
Controller
SDC series etc.
MVF
RS-232C
Personal computer etc.
Pulse counter
PCG13
1
