Flowmeter SVTU-11B, Operating Manual

Page: 8 / 68

8
−
work time and non-work time can vary from 10
-5
t
о
1 hour;
−
current time is 1 sec.
3.11 Meters provide measurements of volume (mass) of the water in ranges of volume-
tric flow rates resulted in the table 3.3.
The table contains values of the lower limit of the flow rate (q
i
), permanent flow rate
(q
p
) and the upper limit of the flow rate (q
s
).
Table 3.3
Flow measurement
section FS
Measurement range of the water
,
m
3
/hour
q
i
q
p
q
s
FS
-20
0.05 5 6.5
FS
-32
0.22 22 30
FS
-50
0.7 70 90
FS
-65
1.2 120 160
FS
-80
1.8 180 230
FS
-100
2.8 280 360
FS-125
4.5 450 580
FS-150
6.5 650 850
The lowest measurable volumetric flow rate is equal to 0.5·q
i
. If the flow rate is lower
than q
i
flow rate measurement error is not standardized.
3.12 The temperature of the water can vary in a range from 0 up to 150
°
С
.
The measurement range of secondary (not for mass calculation) temperatures can vary
from -49
°
С
to 150
°
С
.
Number of channels for temperature measurement can vary from 1 t
о
3 in accordance
with the order.
3.13 The maximal pressure measured by the meter is 4
М
P
а
.
The range of the electric signals from pressure transducer varies from 4 up to 20 mA.
3.14 Meters have output signal for data communication by standard interface RS-232C.
3.15 Meters’ power supply is realized by built-in lithium battery of 3.6V. Battery life-
cycle is 5-6 years. Battery replacement can be done directly on-site without meter shutdown.
WARNING! Meter is delivered with switched off battery.
While delivering by air transport the battery should be switched off and removed from
the meter.
3.16 Nominal diameters (DN), overall dimensions and weight of FS,
а
nd also length and
weight of R
Т
D depending on their type are shown in tables 3.4,
3.5
and on Figure 3.1.
The notice
1 It is possible to increase the total length of FS due to the length of straight sec-
tions before and after places for installation of ultrasonic flow sensors.
2 DN is the designation of nominal bore, which numerical value is approximately
equal to internal diameter of attached pipe sections.
3.17 For configurations 1 and 3 in modification
М
1 water meter meets accuracy class 1,
in modification
М
2 water meter meets to accuracy class 2 in accordance with EN 1434.