AFLOWT BUF, Руководство по эксплуатации

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1.2 Specifications
1.2.1. Specifications are listed in Table 1.
Table 1
Parameter Value
1. Nominal diameter of the
pipeline, DN
32 40 50 65 80 100 125 150 200 250 300
2. Minimal measured average
volumetric flow rate Q
min
, m
3
/h
0.11 0.18 0.28 0.48 0.73 1.13 1.77 2.50 4.53 7.10 10.15
3. Measured transient aver-
age volumetric flow rate Q
trans
,
m
3
/h
0.55 0.9 1.40 2.40 3.60 5.70 8.80 12.7 22.6 35.4 50.9
4. Maximal measured average
volumetric flow rate Q
max
, m
3
/h
14.5 22.6 35.4 59.8 90.6 141.5 221.1 318.4 566.0 885.0 1290
5. Sensitivity threshold, m
3
/h 0.022 0.036 0.06 0.10 0.15 0.24 0.35 0.54 0.96 1.50 2.16
6. Maximal pressure in the
pipeline, MPa
1.6 (2.5
– request)
7. Temperature
of medium, °C
0-90 (130
– request)
8. Power supply voltage, V 3.6 from a lithium battery
9. Mean time to failure, h 75000
10. Mean life time, years 12
1.2.2. Under normal operating conditions*, the lithium battery keeps the flow
meter operational for at least 10 years without changing the battery.
*Normal operating conditions are as follows:
- Ambient temperature from +15 to +
35 °C
- For frequency / pulse / logical outputs, maximal operating frequency of
no more than 8 Hz
- Logs are read (via interface) not more frequently than once a month
- LCD works no more than 3 min per day.
1.2.3. The flow meter measures average volumetric flow rate at flow velocity
ranging from 0.04 to 5.0 m/s. The relation between flow velocity v and
flow rate in the pipeline Q is determined by the following formula:
2 3 -
DN 10 × 2.83
Q
= v ,
Where Q
– average volumetric flow rate, m
3
/h;
v
– flow velocity, m/s;
DN
– nominal diameter of the pipeline, mm.
1.2.4. Limits of permissible relative error for measurement, indication, logging,
storage and transferring of average volumetric flow rate and volume
measurement results for any flow direction do not fall outside the follow-
ing ranges:
- From Q
min
to Q
trans
: no more than

4 %
- From Q
trans
to Q
max
: no more than

2%.
The real values of the errors no more (see fig.1):
-

1.0 % at v > 2.0 to 5.0 m/s
-

2.0 % at v > 0.10 to 2.0 m/s
-

4.0 % at v > 0.04 to 0.10 m/s.