1.1Contents of the instruction manual .....................................................................................................................4
1.2Safety information ...............................................................................................................................................4
2.1Configuration of a measuring system .................................................................................................................5
2.4Measuring range .................................................................................................................................................8
3.1Indicating and operating elements ....................................................................................................................12
7.1.1 Allocation of a multiplication factor.........................................................................................................23
7.1.2 Measuring unit .......................................................................................................................................23
7.1.3 Decimal point .........................................................................................................................................23
7.1.4 Integration time ......................................................................................................................................24
7.3Impulse value for flow relay ...............................................................................................................................24
7.4Impulse value for sampling relay.......................................................................................................................24
7.5Definition of the min. flow volume limit ..............................................................................................................25
7.6Calculation examples of the max. flow ..............................................................................................................25
9.1Enquiry of the optimization................................................................................................................................35
9.3Definition of the operating range .......................................................................................................................37
9.5Adjustment of the max. gain .............................................................................................................................37
9.8Protocol of the optimization...............................................................................................................................38
9.7Basic adjustment, mode range optimization .....................................................................................................38
The Technical Information / Operating Instructions is
called TIB. It contains all necessary information for correct
- installation
- connection
- set-up
- linearization
- optimization
of the pulse-echo-measuring system VEGASON 71 - D.
VEGA regularly revises the contents of TIBs as technical
improvements are made to the instruments.
1.2Safety information
The described module must only be installed and operated
as described in this TIB. Please note that other action can
cause damage for which VEGA does not accept
responsiblity.
1.3Product description
The pulse-echo measuring system VEGASON 71 - D is
used for flow and level measurement.
A measuring system consists of
- a central electronics and
- a sensor.
The sensor is provided with a temperature sensor for
compensation of the temperature influence to the sound
running period. Measuring data and temperature
information are transmitted along the same coaxial cable.
All adjustment procedures, optimizations etc. can be
directly programmed via a keyboard on the central
electronics.
1.4Approvals
If a measuring system is mounted acc. to the following
approval, the respective legal document has to be used
and the regulations have to be strictly observed.
Approvals for hazardous areas, certificate acc. to
CENELEC.
Consisting of:
- central electronics VEGASON 71 - D
- sensor SW 71 R Ex
defined in the conformity certificate PTB-no.
Ex-94.C.4066.
The running periods of periodically emitted sound impulse
packets which are reflected by the flow product to be
measured are evaluated.
The running period of sound is a measure of the distance
between sensor and liquid surface.
The control electronics determines this distance and
converts it into flow information.
The measuring results are indicated on the integral LCdisplay and acc. to the version, provided as relay and
current outputs.
The conformity certificate is included with the product on
delivery.
4
VEGASON 71 - D
2 Technical Information
2Technical Information
2.1Configuration of a measuring system
InputCentral electronicsOutputs
Measuring data from the sensor2 LC-display (multi-functional indication)
5.000
1
2
1 2 3
4
VEGASON
Flow module
- 1 relay output for flow
- 1 relay output for sampling
Level module
- 2 relay outputs
Current module
- 1 output flow proportional module
- 1 output level proportional module
Sensor
Central electronics consisting of:
- plastic housing with cover
- operating elements (5 keys)
- LED-display
- two LC-displays (multi-functional displays)
- power supply unit
- data memory (EEPROM, no buffer battery required)
- outputs: flow module, level module, current module
- terminals for power supply, inputs and outputs
VEGASON 71 - D
Sensor:
- in standard version or
- in Ex-version, certificate acc. to CENELEC
Accessories:
- swivelling holder for sensor mounting
Options:
- totalising counter (flow)
- indicator VEGADIS 171 A
- overvoltage arresters
5
2.2T echnical data, VEGASON 71 - D
Power supply
Operating voltage
- StandardU
- OptionU
Power consumption at U
Fuse for version
and max-load12 V A, 5 W
nenn
16 … 42 V AC or 16 … 60 V DC2 A
90 … 250 V AC500 mA
Measuring range
Min. distance0.300 m
Max. distance4.000 m (5.000 m)
Measuring data
Min. span10 cm
Display inm (0.000 … 5.000 distance)
Resolution inmm
Scanning3 mm
Measuring frequency50 kHz
Measuring rate0,4 sec.
Angle of reflection (at –3 dB)8°
Linearity error after empty and full adjustment< 0,1 % of measuring range
Temperature error of the electronics0,1 % / 10 k of measuring range
= 24 V AC (16 … 42 V), 50/60 Hz
nenn
U
= 24 V DC (16 … 60 V)
nenn
= 230 V AC (90 … 250 V), 50/60 Hz
nenn
2 T echnical Information
Central electronics
Inputs1 (1 channel, for 1 sensor)
Outputssee section "output"
Housing materialPolycarbonate
Electrical connectionmax. 1,5 mm
2
Cable entry1 x Pg 7, 1 x Pg 13,5 (up to max. 5 x Pg 13,5)
ProtectionIP 65
Ambient temperature-20°C … +60°C
Storage and transport temperature-20°C … +80°C
Weightapprox. 1,9 kg
Output
Indication
LC-display2, 4-digit each
Flow module
1 flow relay outputactive, with status indication (LED)
- voltage impulse24 V
- current impulse20 mA
- pulse duration200 ms
1 sampling relay outputfloating spdt, with status indication (LED)
- contact materialAgCdO and Au plated
- min.turn-on voltage10 mV
switching current10 µA
- max. turn-on voltage250 V AC, 60 V DC
switching current2 A AC, 1 A DC
- max. breaking capacity125 V A, 60 W
6
VEGASON 71 - D
2 Technical Information
Level module
2 relay outputsfloating spdts each
and 2 status indications (LEDs)
- contact materialAgCdO and Au plated
- min.turn-on voltage10 mV
switching current10 µA
- max. turn-on voltage250 V AC, 60 V DC
switching current2 A AC, 1 A DC
- max. breaking capacity125 V A, 60 W
Current module
2 current outputs
- range0/4 … 20 mA
- resolution0,05 % of range
- loadmax. 500 Ohm
- load dependent errorat 0 … 500 Ohm, < 0,2 % related to the range
or module
as described abovehowever with 2 floating outputs each
Fault signal
1 fail safe relay1 floating spdt
contact dataas described under relay outputs
2 failure-LEDs
2.3Technical data, transducer
Transducer SW 71
Material of the transducer housingPVDF
Material of the fixing tubePVDF, thread G 1 A
Connection cable to central electronicsstandard coaxial cable type RG 58
Cable length5 m, as option 300 m
Diameter of cableapprox. 5 mm
Temperature sensorintegrated in the transducer
Ambient temperature-20°C … +80°C
Storage and transport pressure-20°C … +80°C
ProtectionIP 68
Permissible ambient temperature1 bar
Weightapprox. 0,8 kg
Transducer SW 71 R Ex
Ex-approvalPTB-no. Ex-94.C.4066
Flame proofingCasting "m"
MarkingEEx m II T6 or T5 or T4
Material of the transducer housingPVDF
Material of the fixing tubePVDF, thread G 1 A
Connection cable to central electronicsstandard coaxial cable type RG 58
Cable length5 m, as option up to 300 m
Diameter of cableapprox. 5 mm
Temperature sensorintegrated in the transducer
Temperature classT6 = 60°C, T5 = 75°C, T4 = 80°C
Storage and transport temperature-20°C … +80°C
ProtectionIP 68
Permissible ambient pressure1 bar
Weightapprox. 1,0 kg
VEGASON 71 - D
7
2.3Dimensional drawings
(Dimensions in mm)
2 T echnical Information
Swivelling flange
28
138
Central electronics
Min. distance for
adjacent instrument
Flange
DN 150 PN 16
1
2
40
1 2 3
Pg 13,5Pg 7
G 1 A
Sensor
*174
4
VEGASON
5
*229
* Mounting diemsnions
45
90
90
2.4Measuring range
Reference plane
Min.-distance
Measuring range
ø95
Min.-distance
300 mm
0.000 m
0.300 m
max.
4.000 m (5.000 m)
8
VEGASON 71 - D
2 Technical Information
2.5General installation instructions
Open flume with weir (e.g. rectangular)
- Installation of the transducer upstream
- Observe distance to the weir (3 … 4 x h
- Installation if possible centered to the flume
- Installation vertical to the surface of the flow product
- Observe min. distance relating to h
- Min. distance diaphragm opening to downstream water ≥ 5 cm
90°
weir
max
max
)
≥ Min.-
max
h
max
≥ 2 x h
distance
3 - 4 x h
max
90°
upstream water
≥ 5 cm
downstream
water
Open flume with measuring channel (e.g. Khafagi-Venturi flume)
- Installation of the sensor at the inlet
- Observe distance to the Khafagi-Venturi flume (3…4xh
- Installation if possible centered to the flume
- Installation vertically to the surface of the flow product
- Min. distance relating to the height of damping h
max
Note
Otherwise follow the installation guidelines given by the channel manufacturer.
Sensor
3 - 4 x h
max
90°
h
max
max
)
Sensor
VEGASON 71 - D
B
9
2.6Installation fault
< 300 mm
max
h
2 T echnical Information
Fault:Min. distance from sensor to h
maintained.
max
not
Problem: The upper range cannot be measured.
Solution: Correct min. distance of the sensor to 0,3 m.
> 300 mm
max
h
Fault:Distance from sensor to h
Problem: Unreliable results due to very weak echoes.
too large.
max
Solution: Correct min. distance of the sensor to 0,3 m.
Fault:Sensor is not directed vertically to the surface.
Problem: Sensor receives weak echoes.
Solution: Mount sensor vertically.
Fault:Strong heat fluctuations, e.g. sun.
Problem: The measuring accuracy is not constant.
Solution: Install a sun shield in the respective position.
Fault:Sensor too close to the flume wall, i.e. not
mounted in the centre.
Problem: Build-up and rough flume walls cause
measuring problems.
Solution: Mount sensor in the centre of the flume.
10
Fault:Surface has foaming problem.
Problem: The surface of the foam is detected as level.
The measured value is wrong.
Solution: The used measuring principle is not suitable
and must be replaced e.g. by a hydrostatic
system (pressure transmitter).
VEGASON 71 - D
2 Technical Information
2.7Electrical connection
Flow module
Flow module:
- Flow
Terminal 9 and 10
- Sampling
Terminal 12 … 14
91011
Relay output
-
+
Fuse type TR5
Manufacturer, e.g. Messrs. Wickmann,
Current value see 2.2 Technical Data
12
1 2
3
2
1
13 14
Service socket
4
5
Failure relay
output
Power supply
Level module
15 16
18
17
1 2
Relay output
Service switch
19
1
2
20
Attention!
High
voltage
Current module
+ - + -
23
21 22
1 2
Current output
6
24
7
8
standard coax cable
max. cable length = 300 mm
Current module:
- flow proportional
Terminal 21 and 22
- level proportional
Terminal 23 and 24
Note
During operation the sensor is clocked with highperformance impulses. It is therefore recommended to
provide all electrical connections first and then switch on
the power supply.
The connection line to the sensor can be extended as
shown. Therefore observe that a max. line length of 300 m
is not be exceeded.
Sensor
standard waterproof
distributor box
VEGASON 71 - D
11
3Operating surface
3.1Indicating and operating elements
Outer viewInner view
3 Operating surface
LED-indication
Fault signal
1
8888
2
123
LED-indication of the relay
output 1 … 4
4
Measuring units as label in
the provided window
Scheme of
operation
Indication of measured
values
MODEFIELD
1
8888
2
8888
PARAMETER FIELD
MOD
STO
Selection of
mode
Cursor position
figures raise
figures lower
Memory
Indication of measured values
e.g. flow 00.00 … 75.0011.25m3/h
Demonstration after respective programming of
- Measuring unit
- Allocation of a multiplication factor
- Decimal point e.g.
Flow 0 … 100 %50.0%
Level 0 … 100 %50.00%
Distance 0.000 … 5.000 m5.000m
12
Mode range
General parameter adjustment0 - 00…99
Optimization1 - 01…27
Linearization curve 44.H.01…32
Linearization curve 55.H.01…32
Linearization curve 66.H.01…32
Fault signalsE2.01….04
VEGASON 71 - D
3 Operating surface
3.2Operation
VEGASON 71 - D has 3 modes which can be enquired with the MOD-button (scrolling)
- indication of measured values
- mode range
- parameter adjustment.
After 60 mins. VEGASON 71 - D resets automatically to mode "Indication of measured values".
1. Indication
of measured
values
2. Mode
range
3. Parameter
adjustment
5.000
MOD
0Ê000Ê99
48.94
MOD
Cursor position
Figures raise
Figures lower
0 - 00
– – – –0
Cursor position
MOD
Figures raise
Figures lower
+
-
+
-
STO
1. Indication of measured value
Flow in m
3
/h
Flow in %
Level in %
Distance in m
2. Mode range
Enquiry of the mode numbers in the MODEFIELD. The
parameters of the enquired mode numbers can be
checked or modified in mode 3.
3. Parameter adjustment
Programming of the parameters in the PARAMETER
FIELD. The parameter of the respectively enquired
mode can be modified and stored with the key STO.
Push the MOD-key if no modification is desired or if the
modified parameter should not be stored. In both cases
reset in mode 1.
In mode 99 the mode range of the general parameter adjustment can be quit and the optimization as well as the
linearization curve 4 … 6 can be enquired. Reset also in mode 99.
If after STO the actual mode range is enquired again within 60 mins., the last enquired mode number appears
automatically.
VEGASON 71 - D
13
4Set-up
4.1Flow chart for set-up
Connect sensor to control electronics and
switch on the power supply .
4 Set-up
The software version is displayed and the
fault signal responds.
The measuring system is ready and starts
the self-check cycle. Preliminary indication:
0.000 m
Self-check cycle, i.e.:
1. Echo limitation from top to bottom.
2. Echo limitation from bottom to top.
3. Generation of a measuring window, within
which a preferred processing of the echo
is made.
Feeding
phase:
1.
2.
3.
56
4
Sensor
Flume
1
!
2
!
48.94
0.000m
Echo
Measuring
window
After approx. 1 … 3 min. the measuring
system is in operating status. The fault signal
extinguishes. The measuring system has
finished the self-check and operates with the
parameters of the factory setting.
NO
?
YES
Flow measurement
(level measurement in flume)
14
56
1
!
4
2
!
Optimization required.
In the flume a distance of e.g.
0,600 m is determined.
0.600m
VEGASON 71 - D
4 Set-up
4.2Mode range, general parameter adjustment, mode
0 - 000 - 00
0 - 00 …
0 - 000 - 00
0 - 990 - 99
0 - 99
0 - 990 - 99
FunctionMode-no.Mode descriptionParameterPage
(bold = factory setting)
0 - 00Software version ....................................................z.B. 48.94
5.1Empty / full adjustment in metres without flow change
With this adjustment procedure two distances in m are defined which correspond to the levels of 0 % and 100 %.
5.2Demonstration and programming example
Demonstration
m %
0.000
0.350
0.700
100
0
0.35 m distance ^ 100 %
0.7 m distance ^0%
Programming example
0.350 m distance ^ 100 %
• Enquire mode 0 - 12 in the MODEFIELD
• Program 0.350 m in the PARAMETER FIELD
• Then store with key STO
0.700 m distance ^ 0 %
• Enquire mode 0 - 11 in the MODEFIELD
• Program 0.700 m in the PARAMETER FIELD
• Then store with key STO
(The sequence of the empty and full adjustment is individual)
18
VEGASON 71 - D
6 Flow measurement
6Flow measurement
6.1Linearization
6.1.1 Meter flume / weir
The system measures the level and calculates the flow.
The relationship between level and flow is linear in most
cases.
The level value (in %) must be therefore converted into a
flow porportional value.
The necessary mathematical functions depend on the
flumes and weirs used.
For the standard flumes and weirs the respective functions
are available as pre-programmed linearization curves and
can be directly enquired.
Flumes / weirs which do not correspond to the known
functions, can be imitated via three programmable
linearization curves.
Standard flumes / weirs
Pre-programmed
linearization curves
Enquire linearization
curves
0 - 18 =1
7
bis
12
NO standard flumes /
weirs
Programmable
linearization curves
Enquire mode range
0 - 99 =4
5
6
Program index markers
for linearization curves
4 - 01 … 32
5 - 01 … 32
6 - 01 … 32
Enquire linearization
curves
0 - 18 =4
5
6
Processing results flow proportional
VEGASON 71 - D
19
6 Flow measurement
6.1 Linearization (continuation)
6.1.2 Enquiry of linearization curves 4 … 6
In mode 0 - 99 linearization curves 4 … 6 can be enquired as well as the reset (mode 4 - 99, 5 - 99, 6 - 99) to the general
parameter adjustment can be made.
0 - 9 9
5 H . 0 1
4
4 H . 0 1
5
Enquiry linearization curve 4 … 6
6
Reset to general parameter adjustment
0 - 0 1
Programming example
Linearization curve 4
• Enquire mode 0 - 99 in the MODEFIELD
• Program figure 4 in the PARAMETER FIELD
• Then store with STO
• Push MOD-key for enquiry of the index markers
Reset is always made in mode 99 with figure 0 in the P ARAMETER FIELD.
Linearization curve 4
6 H . 0 1
32
4 - 9 9
0
FunctionMode-no.Mode descriptionParameter
(bold = factory setting)
Index4.H.011. index markers- level percent ...................000.0 …
If an indication in flow m3/h is requested, first an allocation
of a multiplication factor to the measured level 0 % and
100 % must be carried out in mode 0 - 13 and 0 - 14.
This allocation of a multiplication factor is only valid for the
indication and does not influence the output results for the
relay and current outputs.
7.1.2 Measuring unit
In mode 0 - 15 first of all the level proportional indication is
converted to a linearized, flow percentage indication,
derived from the allocation of a multiplication factor.
Furthermore different measuring units can be inserted as
label into the respective window.
7.1.3 Decimal point
Furthermore the position of the decimal point can be
determined in mode 0 - 16.
Programming example
Allocation of a multiplier for 0 %
• Enquire mode 0 - 13 in the MODEFIELD
• Program the figure 0000 in the P ARAMETER FIELD
• Then store with STO
On display 1 the actual distance of 0.525 m is indicated at
the moment.
Allocation of a multiplier for 100 %
• Enquire mode 0 - 14 in the MODEFIELD
• Program the figure 7500 in the PARAMETER FIELD
• Then store with STO
On display 1 still the actual distance of 0.525 m is
indicated.
Measuring unit and label
• Enquire mode 0 - 15 in the MODEFIELD
• Program the figure 3 in the PARAMETER FIELD
• Then store with STO
On the display 15 % (linearized value) of the previously
programmed allocation of a multiplier are indicated (112.5).
Demonstration to the programming example
- adjustment see page 18
- linearization curve, page 21
Mode
0-15 = 10-15 = 2 0-15 = 3
distance levelflow
in min %in %
0.350
0.525
0.700
100
0
50
100
15
0
Position of the decimal point
• Enquire mode 0 - 16 in the MODEFIELD
• Shift with key –> the position of the decimal point to the
right until the requested position is reached
• Then store with STO
The desired form is indicated on the display (11.25). Insert
the label m
Flow acc. to
allocation of a
multiplier in m
0 - 14
= 75.00
= 00.00
0 - 13
3
/h into the window.
3
/h
11.25
11.25
VEGASON 71 - D
23
7 Output results
7.1.4 Integration time
An integration time can be programmed in mode 0 - 17 to
damp probable fluctuations during the indication of
measured values.
Programming example
Integration time = 10 secs.
• Enquire mode 0 - 17 in the MODEFIELD
• Program figure 010 in the PARAMETER FIELD
• Then store with STO
7.2Adjustment max. flow
The adjustment of the max. flow at 100 % is necessary to
enable the conversion of flow to flow volume.
The value given by the manufacturer of the weir or flume
at max. flow must be adjusted (this value must be reached
at 100 % of the adjustment carried out).
If the weir of flume is oversized or the data for max. flow
are not known, the required adjustment parameters can be
determined as described in chapter "7.6 Calculation
examples of the max. flow".
7.3Impulse value for flow relay
It is possible to connect a counter to VEGASON 71 - D to
detect the flow quantity. When using a 24 V counter, it can
be directly connected to the flow module, terminal 9 and
10.
In mode 0 - 85 and 0 - 86 the multiplier of the step-down
ratio (flow volume/pulse) can be determined.
Note
The instrument automatically takes the measuring unit
selected for the adjustment of the max. flow.
Example
One impulse on the counter per 5 m
corresponds to 0005 x 1 m
- Mode 0 - 85, flow volume / impulse = 0005
- Mode 0 - 86, multiplier = 0
3
Programming
Flow volume / impulse = 0005
• Enquire mode 0 - 85 in the MODEFIELD
• Program figure 0005 in the PARAMETER FIELD
• Then store with STO
3
Note
The adjusted measuring unit is also valid for the following
programmings of the pulse rate.
Example
Max. flow acc. to manufacturers data = 364 m3/h
corresponds to 0364 x 1 m
- Mode 0 - 82, flow = 0364
- Mode 0 - 83, multiplier = 0
- Mode 0 - 84, time unit = 3 (h)
3
/h
Programming
Flow = 364
• Enquire mode 0 - 82 in the MODEFIELD
• Program figure 0364 in the PARAMETER FIELD
• Then store with STO
Multiplier = 0
• Enquire mode 0 - 83 In the MODEFIELD
• Program figure 0 in the PARAMETER FIELD
• Then store with STO
Time unit = 3
• Enquire mode 0 - 84 In the MODEFIELD
• Program figure 3 in the PARAMETER FIELD
• Then store with STO
Multiplier = 0
• Enquire mode 0 - 86 in the MODEFIELD
• Program figure 0 in the PARAMETER FIELD
• Then store with STO
7.4Impulse value for sampling relay
A sampler can be connected to VEGASON 71 - D. The
sampling relay is provided for the connection of such an
instrument. The control for the sampler can be carried out
flow dependent, time dependent or combined.
Mode 0 - 87 and 0 - 88 for flow dependent control, mode
0 - 89 for time dependent control.
Note
For flow dependent control the instrument automatically
takes the measuring unit selected for the adjustment of
max. flow.
24
VEGASON 71 - D
7 Output results
7.4Impulse value for sampling relay
(continuation)
Example
One impulse on the sampler per 50000 m
corresponds to 5000 • 10 m
- Mode 0 - 87, flow volume / impulse = 5000
- Mode 0 - 88, multiplier = 1
- Mode 0 - 89, time dependent control
every 24 hours = 24
3
Programming
Flow volume / impulse = 5000
• Enquire mode 0 - 87 in the MODEFIELD
• Program figure 5000 in the PARAMETER FIELD
• Then store with STO
Multiplier = 1
• Enquire mode 0 - 88 in the MODEFIELD
• Program figure 1 in the PARAMETER FIELD
• Then store with STO
Time dependent control = 24
• Enquire mode 0 - 89 in the MODEFIELD
• Program figure 24 in the PARAMETER FIELD
• Then store with STO
3
7.6Calculation examples of the max.
flow
The expression "Max. flow" considers the following flume
specific factors
- geometry
- flow rate
- flume material
The respectively valid value can therefore only be stated
exactly by the flume manufacturer .
If this information to an available flume or weir is not
available, it can be approximated.
Therefore the following schedules and fundamentals can
be used.
It must be observed that for the various types of flumes
and weir forms, different versions are possible, which are
however not considered in the formulars.
Supplementary it is recommended to determine and
observe the frame conditions defined in the literature for
flow measurement (surface of flume, flow rate etc.).
The own manufacture of flumes and weirs based on the
following versions is not possible.
7.5Definition of the min. flow volume
limit
With open flumes sediment build-up can cause a zero
error. VEGASON 71 - D would therefore permanently
detect a low flow which will be considered for flow volume
counting.
A minimum flow volume limit can be set in mode 0 - 90 to
eliminate this problem. If the flow is below this limit, this
value is not considered for the determination of the flow
volume.
This parameter adjustment does not influence the level
proportional or flow proportional output via current outputs
or switching relays.
Programming example
Min. flow volume limit at 0,5 %
• Enquire mode 0 - 90 in the MODEFIELD
• Program figure 000.5 in the PARAMETER FIELD
• Then store with STO
For the following flumes, flow schedules and calculation
examples are stated
Page
- Venturi flume26
- Trapezoidal weir (Cipoletti)27
- Rectangular weir without throat28
- Rectangular weir with throat29
- V-Notch30
- Palmer-Bowlus-flume31
Conversion information
- Liter/sec • 3,6 = m3/h
1
3
-m
/h • ––– = Liter/sec
3,6
- Example 10 Liter/sec
^ 36 m3/h
VEGASON 71 - D
25
7.6.1 Khafagi-Venturi flume
with rectangular cross-section and flat bottom
Sensor
3 - 4 x h
max
90°
h
max
Explanation:
Q
= max. flow in m3/h
max
B= flume width in mm or m
K= flume specific factor
h
If a V -Notch acc. to above value is used, the value for Q
can be taken out of the respective column and can be
used for programming of mode 0 - 82 … 0 - 84.
Programming acc. to selection Q
- Mode 0 - 82, flow = 0573
- Mode 0 - 83, multiplier = 0
- Mode 0 - 84, time unit = 3
h
max
Q
min
= 573,3 m3/h
max
h
min
3 - 4 x h
max
k ≈ 3 mm
or
k ≈ 3 mm
45°
Calculation of the actual flow value (Q)
The following formula can be used for calculation of the
actual flow.
Q = K • h
α in °
Q in m
h in m
Assumed values for a calculation example
α =45°
K =2056 (derived from α)
max
h =0,33 m
Calculation example
Q =2056 • 0,33
Programming acc. to calculation example
Q
- Mode 0 - 82, flow = 0129
- Mode 0 - 83, multiplier = 0
- Mode 0 - 84, time unit = 3
2,5
3
/h
= 128,6 m3/h
max
2,5
= 128,6 m3/h
30
VEGASON 71 - D
7 Output results
7.6.6 Palmer-Bowlus-flume
D
D/4
30°
Explanation:
Q
max
D= tube diameter in inch
K= flume specific factor
h
Two point level switch: switching command of f above
switching command on means overfill protection
(function A)
% m
100
75
switching
command off
Mode 0 - 56
switching
command on
Mode 0 - 55
25
50
off
0
on
Diagram for protection against dry running of
pumps
Two point level switch: switching command of f above
switching command on means protection against dry
running of pumps (function B)
% m
100
75
switching
command on
Mode 0 - 55
switching
command off
Mode 0 - 56
25
50
on
0
off
Acc. to the sequence of the switching commands it is
possible to program the respective relay output as overfill
protection or protection against dry running of pumps
(A/B-function).
The min-∆ for the switching commands is 10 mm or 0,5 %.
Mode 0 - 55 means switching command on, i.e.
- the relay of output 1 is energized
- the LED-indication extinguishes
Mode 0 - 56 means switching command off, i.e.
- the relay of output 1 is de-energized
- the LED-indication lights
Same procedure for relay output 2, however mode 0 - 60
and 0 - 61.
32
Programming example for relay output 1
- coordination to measuring unit level in % corresponds
to 0 - 53 = 2
- two-point level switch as overfill protection
Coordination
• Enquire mode 0 - 53 in the MODEFIELD
• Program figure 2 in the PARAMETER FIELD
• Then store with STO
Switching command on
• Enquire mode 0 - 55 in the MODEFIELD
• Program 025.0 % in the PARAMETER FIELD
• Then store with STO
Switching command off
• Enquire mode 0 - 56 in the MODEFIELD
• Program 050.0 % in the PARAMETER FIELD
• Then store with STO
Same procedure for relay output 2, however mode 0 - 60
and 0 - 61.
VEGASON 71 - D
7 Output results / 8 Supplementary programmings
7.8Current module
The pulse-echo measuring system can be equipped with
another module. The module is provided with two current
outputs.
Current output 1 is automatically coordinated to the flow
proportional output result and current output 2 to the level
proportional output result.
The course of characteristics of the current output is fixed
by an initial and final point.
The factory setting defines a course of 4 … 20 mA
corresponding to 0 … 100 %.
Within the whole range of 0.00 … 20.00 mA, each current
value can be programmed for a raising or falling
characteristics.
The current-∆ between initial and final value must be min.
1 mA.
Programming example
Factory settingProgramming example
% mA
100
80
60
40
Mode 0 - 65
20
End of
characteristics
mA
16
8Supplementary programmings
8.1Failure processing
In mode 0 - 93 the reaction of the relay and current outputs
in case of failure can be defined.
Programming possibilites
ModeCurrent outputsRelay outputs
0 - 93LED
= 1actual currents areno change
stored
= 2current - 0 mA
= 3current corresp. to 0 %operated relay de-energize
= 4current corresp. to 100%
Programming example
Change-over to failure processing
e.g. 0 - 93 = 4
• Enquire mode 0 - 93 in the MODEFIELD
• Program figure 4 in the PARAMETER FIELD
• Then store with STO
Note
For adjustment of the failure processing observe
additionally the schedule of error codes in the supplement.
20
Mode 0 - 66
0
4
Begin of
characteristics
0
End of characteristics 100 % ^ 16 mA
• Enquire mode 0 - 65 in the MODEFIELD
• Program 16.00 mA in the PARAMETER FIELD
• Then store with STO
Begin of characteristics 0 % ^ 0 mA
• Enquire mode 0 - 66 in the MODEFIELD
• Program 00.00 mA in the PARAMETER FIELD
• Then store with STO
VEGASON 71 - D
33
8 Supplementary programmings
8.2Simulation
By this mode it is possible to simulate the outputs along
the whole range of the distance in m, to test the functions
of the connected process control. The simulation
influences the relay outputs, the current outputs and the
indication (display 2).
Operation
The key "+" increases and the key "–" reduces the outputs.
First of all the simulation is made in 5 mm steps and is
accelerated after approx. 10 secs. to 25 mm steps.
Relay outputs
Current outputs
Measured
Sensor
Simulation
Note
The simulation is marked by
- enquiry of mode 0 - 94
- flashing of all figures,
e.g. 0.700 m
value
Indication
0 - 94
0.700
8.3Basic adjustment, mode range
general parameter adjustment
After parameter adjustment of one or several modes it is
perhaps necessary to reset the parameters of this mode to
factory setting.
Mode 0 - 97 offers this possibility, therefore the proviously
adjusted parameters are cancelled. During the
cancellation, CAL is displayed (approx. 5 sec.).
Programming example
• Enquire mode 0 - 97 in the MODEFIELD
• Program figure 1 in the P ARAMETER FIELD
• Then store with STO, CAL is displayed for approx.
5 secs. in the PARAMETER FIELD
8.4Keyword
Acc. to the factory setting the keyword is switched off and
the data input is released.
All mentioned modes can be now enquired and their
parameters can be indicated on the display of the
measuring system and modified if necessary, as described
above.
The activation of the keyword (mode 0 - 98 = 1) protects the
parameters from unauthorized and undesired
modifications.
Warning
During simulation the measured values from the sensor
are NOT transferred for processing. Mode 0 - 94 must be
therefore quit immediately after simulation is finished. The
timer reset (after 60 mins.) should be only seen as kick-off.
After simulation, all outputs are up-dated with the valid
measured value.
Programming example
Simulation example
• Enquire mode 0 - 94 in the MODEFIELD
• Activate simulation with key MOD, at the moment the
actual measuring result flashes in the PARAMETER
FIELD
• Modify the outputs respectively with key "+" or "–"
• After having finished the test procedures quit the
simulation again with MOD or STO-key.
Another release of the data input is only possible after
programming of the keyword (overwriting of the indicated
key symbol).
The programming of the keyword can be made in any
mode and is effective for the whole mode range (mode 98
is 0).
The keyword is: 0070
Programming
Activate keyword
• Enquire mode 0 - 98 in the MODEFIELD
• Program figure 1 in the P ARAMETER FIELD
• Then store with STO
Adjust keyword
• Enquire the desired mode no. for parameter adjustment
in MODEFIELD, here in the example mode 0 - 53
• Enquire data input, the key symbol 0––n is displayed
in the P ARAMETER FIELD
• Program 0070 as keyword
• Then store with STO
• The programming of e.g. mode 0 - 53 can be continued
34
VEGASON 71 - D
9 Optimization
9Optimization
When dispatched the measuring system is provided with all experience and practical parameters, so that generally no
optimization is necessary.
9.1Enquiry of the optimization
In mode 0 - 99 the optimization as well as the reset (mode 1 - 99) to the general parameter adjustment can be carried out.
0 - 9 9
1
Optimization
Reset to general parameter adjustment
0 - 0 1
Programming example
Optimization
• Enquire mode 0 - 99 in the MODEFIELD
• Program figure 1 in the PARAMETER FIELD
• Then store with STO
• For enquiry of the optimization, push MOD-key
The reset is made in mode 99 with figure 0 in the PARAMETER FIELD.
1 - 0 10 - 9 9
27
0
VEGASON 71 - D
35
9 Optimization
9.2Mode range optimization, mode
Mode-no.Mode descriptionParameterPage
1 - 01 u. 02not coordinated ...........................................................– – – –
1 - 03Instrument version ......................................................71 - D
The pulse-echo measuring system tries to detect an echo
by using the whole gain. This means, that in case of an
empty flume the gain can be bigger than required for the
useful echo when the flow is available.
This causes that sound reflections (false echoes) are
detected as useful echoes. It is useful to limit the control
range of the gain to avoid this.
Note
- The limitation can be adjusted from 0.03 V to 4.50 V, as
optimization up to 4.95 V .
- The optimum adjustment of this mode is only possible
when the flume is empty.
- For orientation a d is indicated on the display of the
measuring system, as long as with the actual gain, an
echo (false echo) is detected.
Programming example
Indication of the echo gain
• Enquire mode 1 - 20 in the MODEFIELD
• e.g. 2.00 is indicated in the P ARAMETER FIELD, i.e. in
case of an obviously wrong indication of measured
values, a false echo is detected with a gain of 2.000
The reduction (offset) depends on the
function and starts with the end of the
measuring window.
Programming example
Reduction and optimization to e.g. 0.20
Reduction
• Enquire mode 1 - 12 in the MODEFIELD
• Program reduction 0.12 (V) in the PARAMETER FIELD
• Then store with STO
Optimization
• Enquire mode 1 - 13 in the MODEFIELD
• Activate the optimization with MOD-key (the whole
parameter indication 0.12 flashes)
• Optimize with "+"-key, until e.g. 0.20 (V)
The optimization is made in 0.01 V steps
If during the optimization a modification in the other
direction is required, this can be realized with key "–".
Limitation
• Enquire mode 1 - 21 in the MODEFIELD
• Program e.g. 2.30 as limitation in the PARAMETER
FIELD
• Then store with STO
Optimization
• Enquire mode 1 - 22 in the MODEFIELD
e.g. d 2.30 is displayed in the P ARAMETER FIELD
• Activate the optimization with MOD-key
• Optimize with "+"-key, until d extinguishes
The optimization is made in 0.02 V steps.
Requirement for this adjustment is that with actually
available flow, a considerably higher gain is sufficient
(relate do above example ≈ 2,50 V).
If during the optimization a modification in the other
direction is required, this can be realized with key "–".
VEGASON 71 - D
37
9 Optimization
9.6Fault signal
The fault signal is triggered when the measuring reliability
is not ensured. The measuring reliability is calculated out
of the ratio echo measurement to noise level
measurement.
The fault signal can be varied as follows:
Explanation in case of fault
Fault signal of mode 1 - 24 = 0 (factory setting)
- Indication of the error code on the display.
- The last as correct detected measured value is stored.
- With the detection of a new correct echo, the last stored
value is cancelled and the actual value is indicated.
Fault signal ON mode 1 - 24 = 1
- Indication of the error code on the display.
- The fail safe relay de-energizes.
- The signal LED lights.
- With the detection of a new correct echo, the fleeding
phase is automatically started and after it is finished an
actual measured value is given.
In both cases the relay and current outputs react acc. to
the failure processing given in mode 0 - 93.
Programming example
• Enquire mode 1 - 24 in the MODEFIELD
• Program fault signal ON with 1 in the PARAMETER
FIELD
• Then store with STO
9.7Basic adjustment, mode range
optimization
All parameters, their data modified during an optimization
can be reset to factory setting if necessary.
Programming example
• Enquire mode 1 - 27 in the MODEFIELD
• Modify figure 0 to figure 1 in the P ARAMETER FIELD
• Then activate the basic adjustment with key STO
Influences
- CAL (flashing) appears for approx. 3 secs. on the
display.
- All modes of the optimization are reset to factory setting
(see protocol)
- The measuring system starts a new feeding phase,
therefore the fail safe relay de-energizes and the failure
LED lights.
- CAL extinguishes after 3 secs. and the figures 0.000
remain displayed.
- This means, basic adjustment activated, feeding phase
started.
- After approx. 1 … 3 mins. the operating status is
reached again. The fault signal extinguishes and the
measuring system operates with the parameters of the
factory setting.