Axis Industries SDU-1M Manual

AB “AXIS INDUSTRIES”
ULTRASONIC FLOW SENSOR
SDU – 1M
TECHNICAL DESCRIPTION, OPERATING INSTRUCTION

PESDU1M02 (MID)
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TABLE OF CONTENTS
1. Application ........................................................................ 3
2. Technical data..……........................................................... 3
3. Package content..…............................................................. 5
4. Operating principle............................................................... 5
5. Sealing ……………………................................................. 6
6. Safety …………….............................................................. 6
7. Installation …….................................................................. 6
8. Calibration ………………………………………………. 7
9. Transportation and storage ................................................. 8
10. Warranty ........................................................................... 8
Appendixes:
Appendix A. Dimensions of flow sensor and connection flanges 9
Appendix B. Connection terminals of flow sensor 10

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1. APPLICATION
Ultrasonic flow sensor SDU-1M is designed as sub-assembly of heat meter. SDU-1M is used
for measuring fluid flow rate in heating systems and conversion it into electrical pulse signal.
As a component of heat energy meter the SDU-1M flow sensor could by used for commercial
account of energy quantity in district heating plants, in factories, in single or multi family houses.
SDU-1M corresponds to essential requirements of the Technical Regulation for Measuring
Instruments, dated 30 March 2006 (transposing in the NB’s country law Directive 2004/22/EC of 31
March 2004 on measuring instruments):
- Annex I Essential requirements
- Annex MI-004 Heat meter ,
SDU-1M meets the requirements according to accuracy class 2 of EN1434.
SDU-1M meets the requirements according environmental class C of EN1434-1.
Ambient temperature: 5 ...55
o
C
Mechanical environment class: M1
Electromagnetic environment class: E2
Type reference example for technical documentation and order placing:
Sensor SDU-1-M - 10 - 0,05 - 0* - 01*
Type , modification
Permanent flow rate, m
3
/h
Value of pulse, l/pulse
Battery:
0 – without battery/ 1 – with internal battery
Pulse cable (length):
01 – 3 m; 02 – 5 m; 03 – 10 m; 04 – 15 m; 05 – 20 m
06 – 40 m; 07 – 60 m; 08 – 80 m; 09 – 100 m; 10 – 125 m
11 – 150 m; 12 – 175 m; 13 – 200 m; 00 – none
Remark: * - marked numbers are used only for order coding.
2. TECHNICAL DATA
2.1. The measured parameter is a fluid volume that is converted into normalized pulse sequence.
2.2. Table of the flow sensors flow rates, lengths, connection thread (flanges) and the pressure
losses ∆P
,
at q =q
p
:
Limits of flow rate, m
3
/hPermanent
flow rate,
q
p
Length, mm Connection
lower
q
i
permanent
q
p
upper
q
s
Pressure losses
∆ p, at q
p,
MPa,
less than
Fig. No.
A
appendix
3,5 260 Thread G 1 1/4 0,035 3,5 7,0 0,004 Fig. A1
6,0 260 Thread G 1 1/4 0,06 6,0 12,0 0,01 Fig. A1
10,0 300 Thread G 2 0,1 10,0 20,0 0,01 Fig. A2
15,0 270 Flange DN50 0,15 15,0 30,0 0,012 Fig. A3
25,0 300 Flange DN65 0,25 25,0 50,0 0,02 Fig. A4
40,0 350 Flange DN80 0,4 40,0 80,0 0,018 Fig. A4
60,0 350 Flange DN100 0,6 60,0 120,0 0,018 Fig. A4
2.3. Flow measurement threshold 0,2 q
i
2.4. Admissible measuring error according to EN1434 (class 2):
E
f
= ±(2+0,02q
p
/q)

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2.5.Table of default settings of the pulse value depending on the permanent flow rate and sensor size:
Permanent flow q
p
, m3/h 3,5 6 10 15 25 40 60
Pulse value, liter/ pulse 0,02 0,02 0,05 0,05 0,2 0,2 0,5
Other pulse value settings could be selected according user needs by ordering the flow sensor.
The pulse value is also indicated on the label of the flow sensor.
2.6. The two modes of output pulse transmission are possible: passive (open drain) and active. The
output pulses can be selected by choosing the location of the jumper JP (appendix B)
2.6.1. The passive output pulse transmission mode is set when jumper JP is located on the 2 and 3
pins (lower position). The circuit of connection to the device output pulse terminal is shown below.
The drain supply voltage ranges +3 ... +24 V
The maximum drain current 30 mA
The output pulse circuit meets „OD“ class requirements.
Load resistance R
D
must be chosen in accordance to avoid of exceeding the maximum drain current.
2.6.2. The active output pulse transmission mode is set when jumper JP is located on the 1 and 2 pins
(upper position). Such pulse transmission mode is recommended to use for transferring pulses to heat
energy calculator.
The voltage ranges during the pauses between pulse transmissions +3,0… + 3.6 V
The voltage ranges during the pulse transmission 0 ... + 0,6 V
The output pulse circuit meets „OD“ class requirements.
2.6.3. In the case of normal operating of the flow sensor the output pulses are transmitted in
“meander” style frequency packages every second. The period of signal is not shorter than 4 ms, the
durations of the high and low level signal are not shorter than 2 ms.
In the cases of the opposite flow, q < 0,2 q
i
or empty pipe condition the logical signal level is
high and no pulse transmission appears.
In the case of device error the logical signal level is low. The external devices that can analyze
the output pulse signal level (for example: heat energy calculator SKS3) can detect the situation of
device error if the low signal level lasting longer than 2 second.
2.7. Device status testing.
Visually the device status can be tested by pushing the test button (that is located on the inner
device panel - see appendix B) and observing the indication of green and red light emission diodes
(LED). Other way of recognizing the device status is possible by analyzing the logical status of pulse
output signal and direction (D) output signal:
Device status Green LED
(1)
Red LED
(1)
Output pulse Direction
output (D)
Error
output (E)
1. Normal flow Blinking light No light Transmission of pulses Low level Low level
2. Opposite flow Blinking light Blinking light High level High level Low level
3. Empty pipe Steady light No light High level Low level High level
4. Device error No light Steady light Low level Low level High level
5. q > 1,1 q
s
No light Blinking light Amount of pulses
corresponds to q = 1.1 q
s
Low level Low level
6. q < 0,2 q
i
Steady light Blinking light High level Low level Low level

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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
s
per +10 %, the flow sensor transmits
the amount of pulses which corresponds to the flow rate q
s
+10 % and indicates corresponding
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
p
, m3/h 3,5 6 10 15 25 40 60
Weight, less than, kg 3,0 3,0 3,2 6,0 10,5 13,5 14
Dimensions of the flows sensors and its connection flanges is presented in the A appendix.
2.11. Environmental conditions:
- ambient temperature 5
o
C to 55
o
C,
- ambient humidity < 93 %,
- atmospheric pressure 86 kPa to 106,7 kPa,
- fluid temperature 10
o
C to 130
o
C,
- fluid pressure <1,6 MPa.
2.12. Degree of protection IP65 or IP67 (with separate order)
2.13. The flow sensor meets the requirements according to 89/336/EEC, EN50082-2, EN50081-2
3. PACKAGE CONTENT
Components included in the complete Quantity Remark
1. Flow sensor SDU-1 1
2. Set of additional connection flanges 1 *
3. Technical description, operating instruction of SDU-1 1
4. Pulse cable (length from 3 m to 200 m) 1 **
5. 3,6V lithium battery, 8Ah, size C 1 *
REMARK: * - included on demand only
** - cable length depending on the order. Standard length – 3 m.
4. OPERATING PRINCIPLE
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:
V =K H * K M * (1/t
+
- 1/t
-
) *T ,
where: V - measured fluid volume, m
3
;
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 H – hydrodynamic correction factor;
K
M –coefficient that depends on the flow sensor dimensions.
Measured flow rate is converted into the pulses quantity that is transferred in output pulse terminal.

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5. SEALING
The following flow sensor sealing is provided:
5.1. Manufacturer seals:
-Adhesive seal-sticker on the bolts of cover protecting ultrasonic transducers (Appendix A,
Figures A1,A2 and A3).
-Hanged seal on ultrasonic transducers mounted in flow sensor (Appendix A, Figures A4).
5.2. Calibration seal:
-Seal on the inner cover inside electronic box (Appendix B1).
5.3. Mounting seal:
-Seal on the bolt on top cover of the electronic box (Appendix A).
6. SAFETY
6.1. Risk factors during the flowmeter installation and service is a heat conveying fluid flowing
within flow sensor with inner pressure up to 1,6 MPa and temperature up to 130
0
C. To eliminate this
risk the service and installation works must be performed by qualified staff. Mounting of the
flowmeter is permissible only after ensuring of absence of heat conveying fluid in the pipeline.
6.2. By connecting the flow sensor to the external pulse registration device which is powered via
AC 230V check the proper grounding of external device.
7. INSTALLATION
7.1. The dimensions of the flow sensor and its connection flanges are presented in appendix A. The
wiring of signal cables is presented in appendixes B.
7.2. Check installation of the flow sensor corresponds to the notes on the label (Flow sensor placed
in forward or return line).
7.3. It is necessary to rinse out the flow sensor installation place in pipeline before installing the
flow sensor. It is recommended to use any piece of pipe as a substitute for the flow sensor during pipe
installation and rinsing out.
7.4. Flow sensor meets requirements of mechanical class M1 (minimal vibrations, fixed mounting
place). Avoid mounting of flow sensor near the sources of possible vibration (pumps, etc.).
7.5. Requirements for flow sensor installation in pipeline:
- For flow sensors with threaded end connection G1 1/4 (q
p
= 3,5 m
3
/h and 6,0 m
3
/h): no
requirements for straight pipeline length in upstream and down stream directions.
- For flow sensors with threaded end G2 (qp = 10 m3/h) and flanged connection
DN50…DN100 (qp = 15,0 m3/h.... 60,0 m3/h):
- upstream straight pipeline length must be not less 5DN and downstream straight
pipeline length must be not less 3DN when flow disturbance is pipe elbow (1 or 2
elbows);
- upstream straight pipeline length must be not less 10DN and downstream straight
pipeline length must be not less 3DN when flow disturbance is valve, pump or other;
7.6. Avoid the flow sensor installation near after the pumps which can cause cavitations.
7.7. Flowmeter can be mounted both vertically and horizontally in pipelines. Vertically mounting of
the flowmeter is allowed only if flow direction in the pipeline is from down to up.
7.8. The direction of the sensor installation (is indicated with the arrow on the label of flow sensor)
must mach with the flow direction in pipeline.
7.9. When flow sensor is mounted in horizontal pipeline, it is recommended to turn electronics box
on the one side of flow sensor as shown in (Fig. 1 b,c,d):
- for flow sensors with q
p
= 3,5 ... 15,0 m
3
/h;
- if there is a possibility of the increase of fluid temperature above 100
0
C;
- flow sensors with q
p
= 25,0...60,0 m
3
/h should be turned in downward position of ultrasonic
transducers (Fig 1 d).

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a b c d
Fig.1. Positioning of flow sensors: a) – not recommended position; b) and c) – recommended positions for flow
sensors with threaded end connection G1 1/4 (q
p
= 3,5 m
3
/h and 6,0 m
3
/h), G2 (q
p
= 10,0 m
3
/h) and flanged
connection DN50 (q
p
= 15,0 m
3
/h); d) recommended position for flow sensors with flanged connection DN65,
DN80, DN100 (q
p
= 25,0 m3/h.... 60,0 m3/h).
7.10. The flange gaskets must mach with the pipe diameter. During the installation gasket must be
exactly centered with the center of the pipe cross-section to avoid sticking out gaskets inside the pipe.
7.11. The connection of the output pulse cable or battery power supply cable must be performed with
the grounded cables with signal wires with the cross-section not less than 0.12 mm
2
. These cables must
be laid at least 0,5 meter from the high voltage power cables. The connection terminals and wiring of
signal cables is presented in appendix B. It is recommended to use cable with external diameter of
4…6 mm.
7.12. Connection of power supply:
- See connection diagram in appendix B2 if flow sensor is powered from external source,
- Connect battery connector to contact BAT if flow sensor includes inner lithium battery
(Appendix B1).
7.13. After installation flow sensor in the pipeline check the device status that is indicated via LEDs
(after pushing the test button) and corresponding status on the indicator of heat/flow energy calculator.
IMPORTANT !
- Sensor can be installed in the pipeline only after completing welding works.
- It is prohibited to carry out welding works on the pipeline, in which is mounted flow sensor.
8. CALIBRATION
8.1. It is recommended to perform calibration and testing of the flow sensor in the „Test“ mode.
The „Test“ mode is set on by placing the 2,54 mm contact pitch jumper on the 13-14 pins in contactor
J1. The contactor J1 is located under the cover on the right side in PCB board (Appendix B3).
8.2. For measuring the quantity of the output pulses during the flow sensor calibration it is
recommended to use passive output pulse transmission mode (open drain electrical connection). This
mode is set on by placing the jumper JP on the 2 - 3 pins. (see p.2.6.1. and appendix B3).
8.3. The recommended minimal quantity of the output pulses and measurement duration for flow
sensor operation modes:
Flow Pulse quantity Measurement duration of
in “Test” mode
Measurement duration in
working mode
0.1 q
p
<q ≤q
s
N≥1000 T> 2 [min] T> 5 [min]
qi ≤q ≤0.1 q
p
N>500 T > 2 + 8 q
i
/q, [min], T > 5 + 10 q
i
/q, [min],
The both conditions must be satisfied by performing the calibration and testing.
8.4. After the testing and calibration procedures the “Test” mode must be off by removing the
jumper from the pins 13-14 in contactor J1. The access to the inner contactors in PCB board must be
protected with the cover. The screw of the cover must be sealed with calibration seal.

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9. TRANSPORTATION AND STORAGE
9.1. Packed equipment may be transported in any type of covered vehicle. Equipment should be
anchored reliably to avoid shock and possibility to shift inside vehicle.
9.2. Equipment should be protected against mechanical damage and shock.
9.3. Equipment should be stored in dry, heated premises, where environment temperature is not
lower than +5
o
C. No aggressive chemical substances should be stored together because of corrosion
hazard.
10. WARRANTY
Manufacturer gives the warranty that equipment parameters will meet the technical requirements,
listed in the paragraph 2 of this document, if transportation, storage and operation conditions will be
followed.
Warranty period - 12 months from bringing into operation, but not more than 18 months from
manufacturing date.
Manufacturer’s address:
AB “AXIS INDUSTRIES”,
Kulautuvos g. 45a,
LT47190 Kaunas,
Lithuania
Phone: [phone];
Fax: [phone].
[email protected]
www.axis.lt

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Appendix A. Sizes and dimensions
Fig. A1. Dimensions of flow sensors with q
p
= 3,5 m
3
/h; 6,0 m
3
/h.
Fig. A2. Dimensions of flow sensor with q
p
= 10,0 m
3
/h.
Fig. A3. Dimensions of flow sensor with q
p
= 15,0 m
3
/h (DN 50).
Fig. A4. Dimensions of flow sensors with q
p
= 25 m
3
/h (DN 65), q
p
= 40 m
3
/h (DN 80), q
p
= 60 m
3
/h (DN 100),
q
p
, m
3
/h L H B Connection
3,5 260 112 76 Thread G1 1/4
6,0 260 112 76 Thread G1 1/4
q
p
, m
3
/h L D D1 H B Connection
25,0 300 180 145 180 205 DN65
40,0 350 195 160 195 210 DN80
60,0 350 215 180 215 230 DN100
q
p
, m
3
/h L H B Connection
10,0 300 95 120 G 2
q
p
, m
3
/h L D1 H B Connection
15,0 270 125 130 145 DN50

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Appendix B1
Connection terminals of flow sensor SDU-1M
Battery connection
terminal BAT
Lithium battery
3,6V, 8Ah, size C
Pulse, status and external powering
signal connection terminals:
U+ – external power supply (+3,6V)
(used if there are no lithium battery
installed),
 – pulse output,
GND – ground (-).
D – direction signal (open drain),
E – error signal (open drain).
Button for status
indication
Calibration seal
Pulse output signal configuration
with jumper location (1-2-3):
- connected (1-2) – active output
(used for transferring pulse to
calculator, if they are powered
from the same battery),
- connected (2-3) – open drain
output.
LED for status indication
(green and red)
Cable sealant

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Appendix B2
Connection of pulse cable
Supply of flow sensor SDU-1 from external (calculator) battery
The internal battery is not
installed, if SDU-1 is
powered from the
external power supply
Configuration of pulse output
:
- Jumper should be set on pins 1-2 (active output)
when calculator and flow sensor is powered from
the same battery.
Connection of a pulse cable :
Red (U+) external supply (+3,6B) ;
White () –pulse;
(GND) – Ground (-);
Red (+U)
White
(









)
GND

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Appendix B3
Set up of “Test” mode and configuration of output pulse signals for calibration
Test mode is set on by placing the jumper
on the 13-14 pins in contactors J1
Configuration of output pulse transmission mode:
Jumper on 1-2: Active mode
Jumper on 2-3: Passive mode (open drain electrical connection)