Flowmeter SVTU-11B, Руководство по эксплуатации

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5.3 Flow rate measuring process is continuous. Flow rate measurement is occurred a
few times per second and obtained data are stored. Reading of stored data is occurred 1 time
per second to calculate the quantity of water.
Measurement cycle for temperature and pressure is one time in 10 sec.
Every measurement cycle lasts for 1 sec and includes measurement of water parame-
ters, as well as self-diagnostics of the meter.
5.4 Water meters are delivered in following configurations (see Appendix B):
−
1 – 1-channel water meter;
−
3 – 2-channel water meter;
Schemes for sensors connection in different configurations are represented in Appen-
dix B.
5.5 Calculation and storage of average temperature values the meter carries out as
arithmetic mean for set period of time (hour or day).
5.6 The meter carries out flow measurement in the range from 0.5q
i
(q
min
) till q
s
(see table 3.2).
For all types of FS measurement errors are provided in a range [q
i
(q
min
); q
s
], but in sub-
ranges [0.5
.
q
i
(q
min
); q
i
(q
min
)[ the mentioned measurement errors are not standardized, how-
ever device working capacity is kept, and water mass storing and calculation are carried out.
While measuring instantaneous flow rate values
.
q
<
0.5 q
i
(q
min
) the device indicates
zero flow and mass storing
m
=q
⋅
ρ
isn’t carried out.
5.7 Measurement of water overpressure is carried out by calculator while measuring the
current of electric signal from the pressure transducer. Overpressure values
Р
op
(MPa),
measured and displayed by the calculator, and current I
in
(mA) on an input of pressure mea-
suring channel (on the calculator input) are connected by a following ratio:
2 1
op meas 1 1
2 1
(P P )
P (I I ) P
(I I )
−
= − ⋅ +
−
(5.12)
where P
1
and P
2
are pressure values in two points of pressure transducer characteristic
(for example, minimal and maximum pressure);
I
1
and I
2
are correspondingly currents on the PT outputs in the above specified
points;
U
meas
is value of measured current on the output of PT.
5.8 While measuring time parameters the meter carries out measurement of following
quantities: time of correct work (running or work time), time of incorrect work (time of er-
rors), power on time, power off time (non-work or idle time), and also displays current
date/time (taking into account daylight saving).
Time of correct work (running time
Т
run or work time) – device operating time
(power on, no error messages). Time of correct work on 1-st and 2-nd channels is displayed
on the water meter indicator in a mode
«Indication of additional parameters» (see item
11.2.2, table 11.3 of this Manual, and also Appendix D).
Time of incorrect work (time of errors Terr) – device operating time (power on,
there are error messages).
Т
err values are presented in printouts of stored data archives and
error archives.