Axis Industries SDU-1M Техническое описание, инструкция по эксплуатации - Страница 5
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Remark: 1. LED indication begins when the button is pushed down.
Status signals E (Error) and D (Direction) are passive signals and should be wired using the open drain
output signal connection diagram such shown in 2.6.1 p.
2.8.
When the measured flow rate exceeds maximal flow q
the amount of pulses which corresponds to the flow rate q
overflow status code.
2.9.
The flow sensor is powered:
- From an external power source DC 3,6V ±0,2V (average current less than 35 µA),
or
- From internal +3.6V lithium battery, size C, with up to 12 years lifetime.
2.10. Table of flow sensor weight, corresponding with the nominal diameter:
Permanent flow q
, m3/h
p
Weight, less than, kg
Dimensions of the flows sensors and its connection flanges is presented in the A appendix.
2.11. Environmental conditions:
- ambient temperature
- ambient humidity
- atmospheric pressure
- fluid temperature
- fluid pressure
2.12. Degree of protection
2.13. The flow sensor meets the requirements according to 89/336/EEC, EN50082-2, EN50081-2
Components included in the complete
1. Flow sensor SDU-1
2. Set of additional connection flanges
3. Technical description, operating instruction of SDU-1
4. Pulse cable (length from 3 m to 200 m)
5. 3,6V lithium battery, 8Ah, size C
REMARK: * - included on demand only
** - cable length depending on the order. Standard length – 3 m.
4.1.
The ultrasonic flowmeter SDU-1 is microcontroller based device that consists of flow sensor
and electronic part mounted on the flow sensor.
Flow measurement is based on the time-of flight measurement method. Fluid volume is
calculated according the formula:
where: V - measured fluid volume, m
T – time of integration, s;
t
- measured upstream time of flight of ultrasonic pulse, s;
+
t
- measured downstream time of flight of ultrasonic pulse, s;
-
K
– hydrodynamic correction factor;
H
K
–coefficient that depends on the flow sensor dimensions.
M
Measured flow rate is converted into the pulses quantity that is transferred in output pulse terminal.
PESDU1M02 (MID)
3,5
6
10
3,0
3,0
3,2
o
5
C to 55
< 93 %,
86 kPa to 106,7 kPa,
o
10
C to 130
<1,6 MPa.
IP65 or IP67 (with separate order)
3. PACKAGE CONTENT
4. OPERATING PRINCIPLE
V = K
* K
* (1/t
H
M
3
;
per +10 %, the flow sensor transmits
s
+10 % and indicates corresponding
s
15
25
40
6,0
10,5
13,5
o
C,
o
C,
Quantity
- 1/t
) *T ,
+
-
60
14
Remark
1
1
*
1
1
**
1
*
5