BOPP & REUTHER MESSTECHNIK MID-MDS Series User manual

Bopp & Reuther
Messtechnik GmbH
Am Neuen Rheinhafen 4
67346 Speyer
Germany
Phone: [phone]
Fax: [phone]
[email protected]
www.bopp-reuther.de
A-EN-05801_00Rev.B
07/2018
Page 1 of 41
Dosing System MID-MDS
Operating Manual
Version LINEAR FILLER Single start
Software VER 1.00
Hardware Terminal housing MDS-30/49/84
Boards QB-173
QB-172
QB-170
Counter / Valve boards LS-23
Master board DR-11
Converter board UV-12
Software V100

Dosing System MID-MDS – Single start Operating Manual
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Table of Contents
Foreword 3
I. Transport, Delivery, Storage 3
II. Warranty 3
III. General Safety Instructions 3
1. Identification 4
2. Application 4
3.The dosing system MID-MDS consists of the following components (Fig.1): 5
4. Filling system / installation 6
5. The components of a filling system should meet the following requirements 7
6. Description of the components 9
7. Installation guideline for transmitter 13
8. Installation guideline for the electronics 14
9. Technical data 15
10.Error limits 17
Reference conditions according DIN 19200 and VDI / VDE 2461 17
Error limits according reference conditions 17
11. Requirements for commissioning 17
12. Troubleshooting 18
13. MDS-30 / 49 / 84 21
14. Installation of the terminal boards QBxxx 23
15.Orientation of the functions and terminal boards 24
16.Diemensionsof the MDS-30 / 49 (in mm) 25
17.Diemensions fort he 19“ rack MDS-84 / 49 (in mm) 25
18. Power consumption with built-in components ( 24 VDC only ) 25
19. Procedure for the 1st commissioning as well as for the exchange of 26
20. Setting the jumper for the battery 27
21. Accuracy of dosing systems with magnetic flow meters and electronics series MID-MDS 28
Introduction 28
21.1 Reference of determination of the meter size 29
21.2 Utilization for plastic pipes 29
22. Terminal boards 30
22.1 Terminal boards QB-170 for master boardd DR-11 Version with 1 start 30
22.2 Terminal board QB-172 for counter and valve board LS-23 31
22.3 Terminal board QB-172 for counter and valve board LS-23 32
22.4 Terminal board QB-173 for the converter board UV-12 Connection to transducer MID-MDS 33
23. Data transfer between master board DR-11 and PLC for LINEAR Filler 34
23.1 CONFIGURATION 1 35
23.2 CONFIGURATION 2 37
23.3 Zero point adjustment for all fillers 39
23.4 Read 40
of 3 actual values of the current filling or 40
of 3 actual values of the previous filling 40
23.5 Filling 41

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Foreword
I. Transport, Delivery, Storage
Always protect devices against humidity, soiling, impacts and damages.
Delivery Inspection:
Check the delivery for completeness upon receipt. Compare the device data with the data on the delivery
note and in the order records.
Report any in-transit damage immediately. Damage reported at a later date shall not be recognized.
II. Warranty
Please refer the contractual terms and conditions relating to delivery for the scope and period of warranty.
Warranty claims shall be conditional to correct installation and commissioning in accordance with the
operating instructions of the device. The necessary installation, commissioning and maintenance work
should only be carried out by qualified and authorized personnel.
III. General Safety Instructions
1. Magnetic inductive flow meters series MID are reliable, high accurate volumetric measuring
devices. They should only be used for their intended purpose. Always observe the pressure and
temperature limits stated on the type plate, as well as all other technical data and safety
information during device installation, start-up and operation.
2. Always observe national and international regulations concerning the operation of devices and
systems under pressure.
3. Prior to installation, the operator has to ensure that the pressure bearing parts have not been
damaged during transportation.
4. The devices have to be installed, operated and serviced by qualified personnel. The operator
has the responsibility to ensure that the personnel have received sufficient and appropriate
training. In cause of doubt, please contact the manufacturer.
5. The operator must ensure that the materials used (wetted parts) of the device compared with the
measured liquid are chemically resistant.
6. The gaskets or sealing elements must be handled with care according to the operating
instructions.
7. If a device with 3A approval is used, the process connections must not be exchanged, otherwise
the 3A approval expires. In addition, there is a risk that moisture will get behind the PTFE liners
and thus damage the device in the event of improper replacement.
The replacement voids all warranty claims.
8. Symbols used
Warning!
Failure to observe this warning can lead to injury of persons or a security risk.
Attention:
Non-compliance can lead to faulty operation or damage to the device.

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1. Identification
Manufacturer: Bopp & Reuther Messtechnik GmbH
Am Neuen Rheinhafen 4
67346 Speyer
Phone: [phone]
Fax: [phone]
Product type: Dosing system MID-MDS
Version No. A-EN-05801-00Rev.B
2. Application
The Modular Dosing System MID-MDS is used on both linear and rotating filling machines, where
high accuracy/repeatability is required. The products must have a minimum conductivity of approx.
1 µS/cm. The minimum dosing time achieved to date is approx. 0.1 sec.
Magnetic Inductive Flow Meters series MID have no moving parts, and therefore do not apply any
"work" to the product which could cause changes to the fluid structure. This also enables CIP/SIP
procedures to be carried-out both easily and quickly.

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
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-EN-05801_00Rev.B Subject to change. Page 5 of 41
3.The dosing system MID-MDS consists of the following components (Fig.1):
- Electromagnetic flowmeter series MID with integrated preamplifier
- Dosing system series MID-MDS with
* Converter board type UV- 12
* Master board type DR- 11 with integrated pulse output
* Counter and valve board type LS- 23
* Terminal Typ. XV102
* div. Gehäusen für Karteneinbau: Panel housing Type MDS- 30 (30 TE), or
Panel housing Type MDS- 49 (49 TE), or
19" rack Type BGT - 84 (84 TE)
Mete
r
6
QB-172
Auswahl der
Zähler/Ventil-Karte
Meas. cable
Converter
Pre and end switching
of the dosing valves
Input acc. to
NAMUR
QB-173
QB-173
QB-181
Meter 1
Terminal board QB-170
In- and
outputs
PC/SPS
Terminal XV102
MDS-30/49/84
paralleles Ein-/Ausgangs-Port
seriell 1
seriell 2
Optocoupler
MASTER-KARTE DR-11
Dual-Port-RAM
CPU
Parall input/output port
12 Valve power output stages
Counter / valve board LS-23
Converter
Converter
Converter
Converter
Converter
board UV12
24 VDC
24 VAC
12
1
Meas. cable
Volume pulses
forward/back
I-shut off
1
2
3
4
5
6

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4. Filling system / installation
A filling system/installation generally consists of (Fig.1):
Systems with very short dosing times (min. 0.1 to some sec) need a storage (buffer) tank-see Fig.2-
the level of which must be kept more or less constant, e.g. by using a level control system, which
automatically opens and closes the feed line to the storage tank. This arrangement supplies a dosing
curve (lapse) as shown in (Fig.3):
Fig. 2
Fig. 3
1- stage valve closing
At time A the filling machine starts the batch
process and the dosing valve opens. The
magnetic flow meter measured the product;
the sensed signal is send to the dosing
control and also to the preset counter. At the
end of the batch (B) the dosing valve receives
the signal to close. Because of delay time in
the system (mainly the valve) a certain
excess volume passes the dosing valve until
it is closed and the batch process is finished
Terminal
XV102 or
PLC
MID-MDS -
System

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
A
-EN-05801_00Rev.B Subject to change. Page 7 of 41
5. The components of a filling system should meet the following requirements
a) storage tank ( no pressure, head of liquid only )
The tank dimension (dia.,height) should be such that a batch process (one filling) only causes
a very small level variation (decrease). In the event of a large variation, the head (gravity)
decreases rapidly, the excess volume is altered (Fig.4) and both accuracy and reproducibility
vary.
Fig. 4
2-stage valve closing
It is possible to decrease the excess volume
if a 2-stage valve closing is used. If the valve
receives the pre-batch signal (B), then the
valve closes to a interposition.
If the valve receives the final batch signal (C)
then the valve closes completely.
This kind of valve closing should be used if
- the meter size is > DN 20 or
- the batch is > 0,5 l / sec.
- the velocity in the pipe is > 5 m/sec
The otherwise occurring high pressure peaks
at 1-stage operation is thus avoided.
Dosing time of 1.st filling
Dosing time of the following filling
Start
Start
Batch end Batch end
Excess-
volume
Excess-
volume
v
v
t
t
A B

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Due to the decreasing head of liquid, the flow velocity and the flow rate decrease, resulting in the
dosing time becoming longer and longer! This effect should be avoided if the dosing time is to be kept
constant.
To keep the filling times constant, the liquid level head should be kept within 5%.
b) Piping
Whenever possible rigid metallic piping between storage tank and dosing valve should be installed. If
flexible hoses are used, hydraulic vibrations could disturb the batch processes. The piping should be of
the same size (DN inner dia) as the magnetic inductive flow meter in order that the system can be
deaerated easily.
If hoses are used, then the hoses must be metal cased.
At bigger meter sizes (> DN 15) the
liquid level must be more than 30 cm.
If the level < 30 cm, Vortex-effects are
possible and resulting accuracy vary
(A).
To prevent vortex effects a build – in
straightener is advantageous.
Very important is the position of the
product line in the tank. The outlet of
the pipe must be under the liquid level
(B). In other case, air bubbles are in
the product and resulting accuracy
vary.
Hydraulic vibrations are to be created,
if e.g. diaphragm, hoses or buffer
tanks are existing.
The energy in the liquid is decreased
with the oscillation of the liquid.
If the velocity cross the creeping flow
(B), the pulse output in the converter
card is switched off.
If a new start pulse is coming during
oscillation, the velocity in the pipe
increased (C).

Operating manual Dosing System MID-MDS – Single start
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Messtechnik GmbH
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-EN-05801_00Rev.B Subject to change. Page 9 of 41
c) Dosing valve
The dosing valve is very important for the accuracy/reproducibility of the dosing system. Attention
should be paid to the following parameters:
c1) closing time: the closing time of the valve has to be in a certain ratio to the dosing time (A to
B); the shorter the dosing time the shorter the valve closing time.
Guideline:
<<< the valve closing time should be not more than 10% of the dosing time >>>
If it is more than 10%, the dosing control is only able to register the size of the excess volume, but will
not be able to react to it (i.e. compensate / correct it for the next filling). This effect can only be avoided
by using a two-stage shut-off (two valves), where the 2nd (final) stage can compensate/correct
alterations of the 1.st (pre-) stage.
c2) power supply: whenever possible a DC supply should be used to avoid the influence of the
shape of sine waves of the AC supply. This is especially if the valve closes with voltage, the
valve starts to close when the sine wave has exceeded the starting voltage; in the worst
case this can take 10 ms (50 Hz field) and so cause variations of the batched quantity (in
accuracies).
c3) dosing valve: it is important that only a small
volume is displaced during the closing procedure.
The displaced volume is part of the measured
quantity and thus influences the accuracy and
reproducibility of the complete dosing system. It
should therefore be kept as constant as possible!
An instability of the displaced volume can affect
the accuracy of systems where small quantities
are dosed. Diaphragm valves with metallic body
are recommended, where a diaphragm of a
synthetic material (plastic) is oppressed onto a
metallic edge. This design has another positive
effect: fruit particles and similar solids to be dosed
are squeezed off the valve seat.
6. Description of the components
a) magnetic inductive flow meter series MID has an integrated and detachable pre-amplifier. The
coils for the magnetic field requires a 24 VAC power supply. The cable for interconnection of the
meter and the converter card is approx. 5 m long ( if a length of more than 5 m is required ( max. 200
m ), an extension cable of same type is admissible ). In the event of a malfunction the pre-amplifier
can be detached and replaced; no calibration of the replacement is required! The pre-amplifier is
connected via plug and socket. The meter can be installed either horizontally or vertically. Vertical
installation is preferred for better deaeration; and also deposits are less likely to be trapped in the
meter. In the case of horizontal installation the electrodes must be in horizontal position, i.e. the pre-
amplifier must be above or underneath-but not beside- the meter body. If the meter is used together
with a converter card UV-12 the flow direction (right to left/left to right or from below to above or vice
versa) of the meter is insignificant. The UV-12 switches automatically to the given flow direction and
measurement can be started immediately.
Diaphragm valve type 625 (GEMÜ)

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Cables for power and signals
It is not allowed to install the meter or the electronic in an area with strong magnetic fields. The
measuring cable must be install separately from cables with power or control signals. The best
solution is the installation for the measuring cable in a grounded pipe of metal

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
A
-EN-05801_00Rev.B Subject to change. Page 11 of 41
Dimension of flow meter with sanitary connectors DIN 405
Diameter
DN
Connector
DIN 405
A
mm
B
mm
C
mm
D
mm
E
mm
Actual
power
W
Current
A
Weight
kg
10 RD
28x1/8 80 150 60 60 155 4 0,3 3,5
15 RD
34x1/8 80 150 60 60 155 4 0,3 3,5
20 RD
44x1/6 80 150 60 60 155 4 0,3 3,5
25 RD
52x1/6 120 190 80 75 185 5 0,4 7,5
Dimension of flow meter with steril connectors NAUE (ISO)
Diameter
DN
Connector
DIN 405
A
mm
B
mm
C
mm
D
mm
E
mm
Actual
power
W
Current
A
Weight
kg
10/12
RD
27x1/
10
80 150 60 60 155 4 0,3 3,5
Dimension of flow meter with TRI CLAMP ISO 2852
Diameter
DN
Connector A
mm
B
mm
C
mm
D
mm
E
W
Actual
power
Current
A
Weight
kg
40 2” 120 190 80 75 185 5 0,4 7,5
Note : Other connectors on request

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Measuring cable
The measuring cable is a standard cable to DIN series LIYY- LIYCY) with two shielded and four
unshielded
colour signal voltage core
white measurement 0-50 mVAC
+/- 2 VDC
shielded
brown reference voltage 2 hasta 4 VAC shielded
yellow
green
power supply for
pre-amplifier
+ 15 VDC
- 15 VDC
unshielded
red and blue power supply for
the coils
24 VAC unshielded
Fuses
Fuses for the flow meter (located on the terminal card type QB-173): If only the UV-12 is used (without
housing), the fuses must be set externally.
DN (flow meter) 24
VAC
DN 10 0,4 A
DN 15 0,4 A
DN 20 0,4 A
DN 25 0,6 A
DN 40 0,6 A

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
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-EN-05801_00Rev.B Subject to change. Page 13 of 41
7. Installation guideline for transmitter
Inlet/Outlet
For an optimum flow profile it must be installed an inlet and outlet section. This can be realized. with
straight pipes before and after the meter.
The inlet section must be 5 x DN and the outlet section must be 3 x DN. It is forbidden to install in front
of the inlet section devices which produced effects like spin or vortex, e.g. space bend, butterfly valves
or slider. Any regulation devices must be installed behind the meter.
Inclinations must be rotational symmetrical and the angle should be < 8°.
The inlet, outlet section and the meter must have the same diameter!
Ground connection for transmitter
No additional grounding is required for the transducer. Since the transducer uses the pipe potential as
the measuring reference, the pipe in which the transducer is installed must be earthed.
The transducer must not be installed in plastic pipelines.
The power supply 24 VAC should be also on ground.
Mounting position of the transmitter
It must be insure, that the meter tube is always completely filled during measuring and is
protected against asymmetric formation of deposits. The vertical position is preferred, since it is
simple to make the pipe air free.
DN Upstream Downstream
10 50 30
15 75 45
20 100 60
25 125 75
32 160 100
40 200 120
Length of the upstream- and downstream
pipework for the meter (mm)
Is the meter is installed horizontal, then it must be
insure, that the electrode axis is also horizontal.
Pipework must be supported adjacent to the meter
and connections and provide 3° slope for draining.
If the electrode axis is vertical, then air bubbles can
be isolated the electrical connection between the
electrodes and the product.
In this case the output signal is undeclared

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Laying of the measuring cable
It is forbidden to install the meter in areas with strong magnetic fields. The measuring cable must be lay
separately from power cables and control cables.
To lay the measuring cable in grounded metal pipes is recommended. Measuring cables can be routed
together with other measuring cables.
8. Installation guideline for the electronics
General:
It is forbidden to install the electronics in areas with strong magnetic fields. The cabling must be
carried out in such a way that the cables are separated according to their function:
cables for signals e.g. start, error
cables for control e.g. cable for control the diaphragm valves
cables for measuring e.g. measuring cable between the meter and the
electronics
cables for power e.g. 24 VDC, 24 VAC , power for motors
Cables for signals or cables for control can be routed together to a multiple cable.
Measuring cable must be routed with the same cable type. It is not allowed to bring together
several measuring cables to one shielded cable.
If it is necessary to lengthen the measuring cable, then the terminals for the measuring cable
must be separate from terminals with power. In general the same principle as for the cable is
valid: the terminals must also be separated depending from their function.
Heat development
The produced energy from the electronics must be undisturbed left the housing. It must be insure, that
air circulation is possible
Power supply
When laying the 24 VDC/ 24 VAC power supply, it must be ensured that it is connected in a star
configuration from the power supply to each group. The power supplies must not be looped over the
pit supports, but the supports of each pit support must be individually connected to the power supplies.
When selecting the cable cross-section for the 24 VDC, the current for the solenoid valves must be
taken into account.
These distances can be reduced by using fans.
A fan arrangement for 2 housings should always be
provided. The width of the fan arrangement should be
equal to the width of the housing.
If the fan serves only the air circulation, then it must be
considered that the achievement of the fan increases
the temperature in the inside of the housing.
If the air in the housing is exchanged with the ambient
air, the air should have as little humidity as possible.
For this purpose, suitable ventilation equipment must
be obtained from the cabinet manufacturers.

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
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-EN-05801_00Rev.B Subject to change. Page 15 of 41
9. Technical data
a. Transducer
General:
Nominal diameter: DN 10, 15, 20, 25, 32, 40 (other connectors on request
Pressure max. in bar: Sanitary connector PN10
Tri-Clamp PN16
others on request
Minimum Conductivity: 1µS/cm
Mounting position: vertical, if horizontal cannot be avoided, then the electrodes must be
in horizontal position. The pipe must be completely filled with product
Mounting length: DN 10 to 20  150 mm
DN 25 to 40  200 mm
Measuring cable length: max. 250 m
Any extension of the cable built onto the transmitter is possible, but it
must be of the same type
Type of measuring cable: LIYY-LIYCY
Material:
Metering tube: 1.4571
Process connection: 1.4571
Lining: PTFE
Electrodes: DN: 10 1.4571
DN: 15, 20, 25 ,32, 40 Hastelloy
Housing: Preamplifier  cast aluminum, coated
Housing  Polyurethane
Temperature / Humidity:
Liquid temperature max.: 140°C
Ambient temperature max.: 70°C
Ambient humidity: < 75 % on average, dew-formation permissible
Protection class: P 67 according to EN 60 529
Power supply:
Voltage: 24V AC ±10 % sine wave
Frequency: 50Hz ±5% or 60 Hz ±5%
Distortion factor: max. 1%

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Stromaufnahme bei 24 V DN 10 bis 20: 0,4 A
DN 25 bis 40: 0,6 A
b. MID-MDS system
Allgemein
Housing Panel mount housing or 19" rack
Protection class Panel mount housing:
Front IP 65 according to EN 60 529
Connection terminals: IP 20 according to EN 60 529
19” rack:
IP 20 according to EN 60529
Supply voltage 18 VDC to 36 VDC
Residual ripple < 1%
Current consumption depending on equipment Ambient temperature max. 50 °C
Ambient humidity max. < 50 % , condensation not permitted
Input section UV-12
Input Measuring and reference voltage from transducer
Measuring range 10 m/s standard
2.5 m/s optional
Output Frequency proportional to flow rate
0 to 50 kHz standard (others on request)
see description input part UV-12
Counter/valve card LS-23
Input Volume pulses from input UV-12
Volume pulses 24V or NAMUR card with QB- 181
Output Valve outputs for controlling solenoid valves max. voltage 36 VDC
max. current 0.5 A
Master card DR-11
Inputs via QB-xxx 24 VDC ± 15%
High level > 10 VDC
Low level < 5VDC
Input resistance 2.4 kOhm
Outputs via QB-xxx 18 VDC to 36 VDC
Output current max. 10 mA

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
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-EN-05801_00Rev.B Subject to change. Page 17 of 41
10.Error limits
Reference conditions according DIN 19200 and VDI / VDE 2461
Fluid: water (free of gas)
Liquid temperature: +25°C ± 2 K
Ambient temperature: +22°C ± 2 K
Warm-up time: 30 min.
Installation acc. up-stream section > 10 DN
reference conditions: down-stream section > 5 DN
Error limits according reference conditions
Power supply for transmitter: 24V ± 10 %
Frequency: 50 Hz ±5 % and 60 HZ ± 5% respectively
Power supply for electronics: 18V to 36V DC
Ripple: < 1 %
Pulse output: ± 0,5 % of measured value plus ± 0,01 % FS
FS = 50 kHz at 10 m/s
Repeatability: ± 0,1 % of measured value plus ± 0,005 % FS
Build-up time: 50 ms (10 % to 90 % FS)
Temperature drift during ± 1 % of measured value plus ± 0,1 % FS
warm-up time : 30 min
Temperature influence on ± 0,1 % / 10 degr. C
Transmitter and electronics
11. Requirements for commissioning
a) The flow meter must be correctly installed.
b) The pipeline or the entire dosing system must be completely filled with product.
c) The supply voltages for flow meter and dosing electronics must be switched on.
d) The flow rate in the dosing system must be absolutely zero:
Before starting a dosing or filling machine, a zero point must be set by the terminal XV102 or via
telegram of the PLC. After successful execution, the LEDs on the front panel of the housing MDS- 30
(MDS- 49, BGT- 84) are off;
if not: see section "Troubleshooting", section 12!
e) The external start signal must be connected (push-button or PLC):
it must be connected via the terminal card of the DR- 11 master card; a 24 VDC pulse of at least 10
msec is required. If problems occur: see section "Troubleshooting", section 12!

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12. Troubleshooting
a) The zero point cannot be set:
Requirements: the piping/metering system is completely filled with liquid, the supply
voltage is switched on.
a1) on the terminal card of the converter card UV-12 there are 3 LED's to indicate the power
supply:
24 VAC for the pick-up coils
upper LED off Check whether 24 VAC are present
Check the fuses on the UV-12 terminal card.
15 VDC for converter board and preamplifier
middle LED off check whether 24 VDC are present
Error of the converter card UV-12: replace!
15 VDC for converter card and preamplifier
lower LED off check whether 24 VDC are present
Error of the converter card UV-12: replace!
a2) Reference voltage:
Requirement: 24 VAC present (upper LED on)
check: with a voltmeter measure the reference voltage at the
terminal card of the UV-12 between the brown wire and
the screen: it should be between 2 and 4 VAC!
If this value is not available:
Reference cable (brown wire and shield) to
Check interruption or short circuit!
a3) Check the automatic zero setting:
to check the automatic zero point adjustment. The white wire must be removed
from the terminals; a short-circuit bridge is then installed between the white
wire terminal and the screen.
Select menu item F7 on the operator terminal and carry out the zero point
adjustment: is the zero point adjustable (green LED on the UV-12 is off)?
if "no" : exchange converter card UV-12
if "yes" : replace flow meter

Operating manual Dosing System MID-MDS – Single start
Bopp & Reuther
Messtechnik GmbH
A
-EN-05801_00Rev.B Subject to change. Page 19 of 41
a4) if the zero point fluctuates:
check the complete dosing system (piping, flow meter, valve):
- The complete dosing system (piping, flow meter, valve) must be completely
filled and vented.
- are the valves tight?
- The conductivity must be at least about 1 uS/cm.
- the flow rate must reach at least 0.25 m/sec, or: with flow meters e.g. DN
10, a flow rate of at least 0.02 l/sec, according to the following equation (DN
in mm):
v (m/sec) = ( Q x 1.273,2 ) : DN2
Q (l/sec) = ( v x DN2 ) : 1,273.2
See also section 11. d),
b) if the dosing quantities fluctuate:
b1) Fluctuations of the actual value (volume/weight of the filled container):
check:
- does the inlet pressure of the storage tank change by more than 5 %
between dosages? This must be avoided at all costs, as in this case the
overflow quantities and thus also the dosing quantities fluctuate!
See also section 4, a)!
- if the dosing time is < 0.5 sec, the switching time of the dosing valve has a
very strong effect on the dosing quantity; the switching time of the dosing
valve should not be greater than 10 % of the total dosing time. If the dosing
time is very short, a short switching time or the reproducibility of the valve
must be ensured.
See also section 4., c)c1)!
b2) Fluctuations in the counter reading (see operator terminal, section 5., d),
- If the change in the counter reading (readable on the display) is better than
+/- 1 ml compared to the preselected value, but if the quantities in the
containers show larger deviations, the cause is a non-reproducible dripping
at the valve outlet. Depending on the viscosity of the product, the outlet piece
must be designed in such a way that the volume flow is torn off cleanly!

Dosing System MID-MDS – Single start Operating Manual
Page 20 of 41 Subject to modifications.
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Messtechnik GmbH
c) Function of the LED on the master card DR-11 and counter/valve card LS-23
These cards have 2 LED on the front side.
red CPU
This LED is on when the program is no longer working correctly. In this case
the system is automatically restarted.
When the LED is on, the following should be checked:
a) Is an EPROM installed ?
b) Is the CPU and EPROM correctly installed in the socket?
c) Is the crystal OK for the CPU ?
If a) to c) --> OK, change card !!
yellow This LED has no function for the dosing application.
This LED is used to display information during troubleshooting.
Various software variants use this LED for display.