Nivus OCM PRO CF User manual

Instruction Manual
OCM Pro CF
®
OCM Pro CF - Rev. 07 as of 04.12.2012 Page 1
Instruction Manual for
OCM Pro CF Measurement Device
(Original Instruction Manual – German)
valid as of Software Revision No. 5.08
NIVUS GmbH
Im Taele 2
75031 Eppingen, Germany
Phone [phone] / 91 91 - 0
Fax [phone] / 91 91 - 999
E-mail: [email protected]
Internet: www.nivus.com

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Branch offices
Page 2
NIVUS AG
Hauptstrasse 49
CH - 8750 Glarus
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.nivus.de
NIVUS Austria
Mühlbergstraße 33B
A-3382 Loosdorf
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.nivus.com
NIVUS Sp. z o.o.
ul. Hutnicza 3 / B-18
PL - 81-212 Gdynia
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.nivus.pl
NIVUS France
14, rue de la Paix
F - 67770 Sessenheim
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.nivus.com
NIVUS U.K.
Wedgewood Rugby Road
Weston under Wetherley
Royal Leamington Spa
CV33 9BW, Warwickshire
Phone: [phone]
E-mail: [email protected]
Internet: www.nivus.com
NIVUS U.K.
1 Arisaig Close
Eaglescliffe
Stockton on Tees
Cleveland, TS16 9EY
Phone: [phone]
E-mail: [email protected]
Internet: www.nivus.com
NIVUS Middle East (FZE)
Building Q 1-1 ap. 055
P.O. Box: 9217
Sharjah Airport International
Free Zone
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
Internet: www.nivus.com
NIVUS Korea Co. Ltd.
#411 EZEN Techno Zone,
1L EB Yangchon Industrial Complex,
Gimpo-Si
Gyeonggi-Do 415-843,
Phone [phone]
Fax. [phone]
E-mail: [email protected]
Internet: www.nivus.com

Instruction Manual
OCM Pro CF
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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 3
Translation
If the device is sold to a country in the European currency area, this in-
struction handbook must be translated into the language of the country in
which the device is to be used.
Should the translated text be unclear, the original instruction handbook
(German) must be consulted or the manufacturer contacted for clarifica-
tion.
Copyright
No part of this publication may be reproduced, transmitted, sold or dis-
closed without prior permission. Damages will be claimed for violations.
All rights reserved.
Names
The use of general descriptive names, trade names, trademarks and the
like in this handbook does not entitle the reader to assume they may be
used freely by everyone. They are often protected registered trademarks
even if not marked as such.

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Instruction Manual
OCM Pro CF
Page 4 OCM Pro CF - Rev. 07 as of 04.12.2012
1 Contents
1.1 Table of Contents
1Contents...............................................................................4
1.1 Table of Contents..........................................................................4
1.2 Ex-Approval of Transmitter ...........................................................7
2Overview and use in accordance with the requirements.8
2.1 Overview .......................................................................................8
2.2 Use in accordance with the requirements...................................10
2.3 Specifications ..............................................................................11
3General Notes on Safety and Danger...............................12
3.1 Danger Notes..............................................................................12
3.1.1 General Danger Signs.................................................................12
3.1.2 Special Danger Notes .................................................................12
3.2 Device Identification....................................................................13
3.3 Installation of Spare Parts and Parts subject to wear and tear...14
3.4 Turn-off procedure.......................................................................14
3.5 User’s Responsibilities................................................................14
4Functional Principle ..........................................................15
4.1 General........................................................................................15
4.2 Level measurement using water ultrasound ...............................18
4.3 Level Measurement using Pressure............................................19
4.4 Flow Velocity Detection...............................................................19
4.5 Device Versions ..........................................................................22
5Storing, Delivery and Transport.......................................23
5.1 Receipt ........................................................................................23
5.2 Delivery .......................................................................................23
5.3 Storing.........................................................................................23
5.4 Transport.....................................................................................23
5.5 Return..........................................................................................23
6Installation..........................................................................24
6.1 General........................................................................................24
6.2 Wall Mount Enclosure Installation and Connection.....................25
6.2.1 Selecting the mounting place of the wall mount enclosure.........25
6.2.2 Fastening Wall Mount Enclosure ................................................25
6.2.3 Wall Mount Enclosure Dimensions .............................................26
6.2.4 Wall Mount Enclosure Transmitter Connection...........................26
6.2.5 Wall mount enclosure sensor connection ...................................29
6.2.6 Wall Mount Enclosure Overvoltage Protection ...........................33
6.3 Mounting and connection of the panel mount enclosure ............36
6.3.1 Selecting the mounting place of the panel mount enclosure ......36
6.3.2 Fastening the panel mount enclosure.........................................36
6.3.3 Panel Mount Enclosure Dimensions...........................................36
6.3.4 Panel Mount Enclosure Transmitter Connection .......................36
6.3.5 Panel mount enclosure sensor connection.................................38
6.3.6 Panel Mount Enclosure Overvoltage Protection .........................42
6.4 OCM Pro Power Supply Wall and Panel Mount Enclosure.........44
6.5 Regulator Mode...........................................................................45
6.5.1 General........................................................................................45
6.5.2 Construction of Measurement Section........................................46
6.5.3 Regulator Mode Wiring Diagram.................................................47
6.5.4 Control Algorithm.........................................................................47

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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 5
6.6 Communication ...........................................................................48
6.6.1 General........................................................................................48
6.6.2 Communication Options..............................................................50
6.6.3 Communication Setup via Access Portal....................................51
6.6.4 Data Transmission ......................................................................53
7Initial Start-Up....................................................................59
7.1 General........................................................................................59
7.2 Operator Panel............................................................................60
7.3 Display.........................................................................................61
7.4 Operation Basics.........................................................................63
8Parameter Setting..............................................................64
8.1 Parameter Setting Basics............................................................64
8.2 Operation Mode (RUN) ...............................................................67
8.3 Display Menu (EXTRA)...............................................................70
8.4 Parameter Menu (PAR)...............................................................73
8.4.1 Parameter Menu "Measurement Place"......................................73
8.4.2 Parameter Menu “Level “ ............................................................79
8.4.3 Parameter Menu „velocity“..........................................................91
8.4.4 Parameter Menu "Analog Inputs"................................................96
8.4.5 Parameter Menu „Digital Inputs“.................................................99
8.4.6 Parameter Menu "Analog Outputs"...........................................100
8.4.7 Parameter Menu "Digital Outputs"............................................103
8.4.8 Parameter Menu „Control unit“..................................................105
8.4.9 Parameter Menu "Settings".......................................................114
8.4.10 Parameter Menu "Storage Mode" .............................................115
8.4.11 Data Structure on Memory Card...............................................119
8.4.12 Parameter Menu "Communication"...........................................121
8.5 Signal Input/Output Menu (I/O).................................................127
8.5.1 I/O Menu "Analog inputs"..........................................................127
8.5.2 I/O Menu "Digital Inputs"...........................................................128
8.5.3 I/O Menu "Analog Outputs".......................................................128
8.5.4 I/O Menu „Digital Outputs” ........................................................129
8.5.5 I/O Menu „Sensors”...................................................................129
8.5.6 I/O Menu "Interfaces"................................................................132
8.5.7 I/O Menu "Controller" ................................................................132
8.5.8 I/O-Menu "Memory Card"..........................................................133
8.5.9 I/O-Menu Communication .........................................................136
8.6 Calibration and Calculation Menu (CAL)...................................136
8.6.1 Cal-Menu "Level".......................................................................136
8.6.2 Cal-Menu "Flow Velocity"..........................................................137
8.6.3 Cal-Menu "Analog Outputs" ......................................................140
8.6.4 Cal-Menu "Relay Outputs" ........................................................141
8.6.5 Cal-Menu "Simulation................................................................142
9Parameter Tree.................................................................143
10 Troubleshooting ..............................................................153
11 Verification of the Measurement System.......................157
11.1 General......................................................................................157
11.2 Verification of Combi Sensor with Pressure Measurement Cell157
11.3 Verification of external Level Measurement..............................158
11.4 Verification and Simulation of Input and Output Signals...........159
11.5 Verification of Flow Velocity Measurement...............................159

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Instruction Manual
OCM Pro CF
Page 6 OCM Pro CF - Rev. 07 as of 04.12.2012
12 Maintenance and Cleaning .............................................160
12.1 Transmitter ................................................................................160
12.2 Sensors .....................................................................................160
13 Table "Manning - Strickler Coefficients".......................161
14 Emergency.......................................................................162
15 Dismantling/Disposal......................................................162
16 Table of Pictures..............................................................162
17 Index.................................................................................166
18 EC Declaration of Conformity (Appendix).....................168

Instruction Manual
OCM Pro CF
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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 7
1.2 Ex-Approval of Transmitter
The approval is only valid in connection with the respective indication on the
transmitter nameplate.
The complete Ex approval (4. Supplement) is available on
http://www.nivus.com.

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Instruction Manual
OCM Pro CF
Page 8 OCM Pro CF - Rev. 07 as of 04.12.2012
2 Overview and use in accordance with the requirements
2.1 Overview
A Wall mount enclosure
B Panel mount enclosure
1 Slot with plugged Memory Card
2 USB interface (for service purposes only)
3 Keypad
4 Graphic display
5 Cable glands (only wall mount enclosure)
6 Terminal clamp housing with cover (only wall mount enclosure)
Fig. 2-1 Overview enclosure

Instruction Manual
OCM Pro CF
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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 9
1 Air-ultrasonic level sensor, type OCL
2 Flow velocity wedge sensor, type POA
3 Flow velocity wedge sensor, type CS2
4 Flow velocity pipe sensor, type POA
with sensor screw joint and retaining element
5 Flow velocity pipe sensor, type CS2
with sensor screw joint and retaining element
6 Flow velocity wedge sensor, type CSM
7 Air-ultrasonic level sensor, type DSM
8 Electronic Box for connection of sensors types CSM and DSM
Fig. 2-2 Overview sensors and electronic box

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Instruction Manual
OCM Pro CF
Page 10 OCM Pro CF - Rev. 07 as of 04.12.2012
2.2 Use in accordance with the requirements
The measurement device type OCM Pro CF including the respective sensor
technology supplied by NIVUS is intended to be used for continuous flow meas-
urement of slight to heavy polluted media in part filled and full channels, pipes or
similar. Here the allowed maximum values, as specified in chapter 2.3, must be
strictly kept. All cases which vary from these conditions and are not approved by
NIVUS GmbH in written form are left at owner’s risk.
The device is exclusively intended to be used for purposes as described
above.
Modifying or using the devices for other purposes without the written consent
of the manufacturer will not be considered as use in accordance with the re-
quirements.
Damages resulting from this are left at user’s risk.
The device is designed for a lifetime of approx. 10 years. After that period an
inspection in addition with a general overhaul must be carried out.
The transmitter always has to be installed outside of Ex-zones!
Approval
Transmitter:
II (2)G [Ex ib Gb] IIB
The approval is only valid in connection with the respective indication on the
transmitter or the sensor nameplate.
For installation and initial start-up the conformity certificates and test certifi-
cates of the respective authorities must be followed.
The OCM Pro CF Ex version is adjusted to the NIVUS correlation sensors‘
requirements regarding the intrinsically safe system review according to EN
60079-25.
In case of using sensors from third party manufacturers the operator must
carry out a system review according to EN 60079-25!
The required specifications of the OCM Pro CF Ex version can be taken from
the EC-type examination certificate TÜV 00 ATEX 1572.
The Ex approval of the active sensors is part of the "Technical Instructions for
Correlation Sensors".

Instruction Manual
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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 11
2.3 Specifications
Transmitter
Supply power
100 to 240V AC, +10% /-15%, 47 to 63Hz
or 9 – 36 V DC
Max. consumption
AC: 31 VA / DC: 34 W
Typ. consumption
1 x POA-V1U1 + 1 x NMC0, + 1 relay energised:
230 V AC: (rounded) 14 W
1 x POA-V1U1 + 1 relay energised, 230 V AC = (rounded) 14 W
Wall mount enclosure
-
Material: Polycarbonate
- Weight: approx. 3400g
- Protection: IP 65
Panel mount enclosure
-
Material: Polycarbonate
- Weight: approx. 2800 g
- Protection: IP 54 (front side), IP 20 (reverse side)
Ex-Approval (optional)
II (2)G [Ex ib Gb] II B
Operating temperature
-20°C to +50°C [Ex: -20°C to +40°C]
Storage temperature
-30°C to +70°C
Max. humidity
80%, non-condensing
Display
Back-lit graphic display, 128 x 128 pixel
Operation
18 keys, dialog mode in German, English, French, Czech, Italian, Spanish,
Polish, Danish, Swedish
Inputs
-
1 x 4-20 mA for external level measurement (2-wire sensor)
- 1 x RxTx-bus for NIVUS air-ultrasonic sensor type OCL/DSM
- 1 x (type S4) or 4 x (type M4) 0/4-20 mA, 12 bit resolution for external
level measurement, external control set points and external units data
storage, accuracy +/- 0.4 % of final value (20 mA)
- 4 digital inputs (type M4 only)
- 1 (type S4) or 2/3 (type M4) velocity sensors (POA, CS2 or electronic
box EBM + CSM) connectable
Outputs
-
2 x (type S4) or 4 x (type M4) 0/4-20 mA, load 500 Ohm,
12 bit resolution, accuracy better than 0.1 %
- 2 x (type S4) or 5x (type M4) switchable relays, loadable up to 230 V
AC / 2 A (cos. ϕ 0.9), minimum switching load 10 mA
Data memory
-
1 MB internal data memory for programming and saving of readings
- optional plug-in Compact Flash Card up to 128 MB
Storage cycle
1 to 60 minutes
Data transmission
(for panel mount enclosure
only)
-
Modbus TCP using integrated web server coupling via networks
(LAN /WAN, Internet)
- Internet via Ethernet
- internal ISDN-, GPRS- or analog modem (optional)
Accessories
Memory Card
Type: Compact Flash Card;
Capacity: 128 MB
Readout adapter
PCMCIA interface adapter, mainly for readout using Laptop / Notebook
Readout device with parallel or USB interface for connection to PC
Evaluation software
Type: NivuSoft for Windows XP, Windows Vista or Windows 7 for readout
and evaluation of data, creation of hydrographs, average values,
hour / day and month totals etc.

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Instruction Manual
OCM Pro CF
Page 12 OCM Pro CF - Rev. 07 as of 04.12.2012
3 General Notes on Safety and Danger
3.1 Danger Notes
3.1.1 General Danger Signs
Cautions
are framed and labelled with a warning triangle.
Notes
are framed and labelled with a “hand“.
Danger by electric voltage
is framed and labelled with the Symbol on the left.
Warnings
are framed and labelled with a “STOP“-sign.
For connection, initial start-up and operation of the OCM Pro the following infor-
mation and higher legal regulations (e.g. in Germany VDE), such as Ex-
regulations as well as safety requirements and regulations in order to avoid ac-
cidents, must be observed.
All operations, which go beyond steps to install, to connect or to program the
device, must be carried out by NIVUS staff only due to reasons of safety and
guarantee.
3.1.2 Special Danger Notes
Please note that due to the operation in the waste water field, transmitter,
sensors and cables may be loaded with dangerous disease germs. Respec-
tive precautionary measures must be taken to avoid damage to one’s health.

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3.2 Device Identification
The instructions in this manual are valid only for the type of device indicated on
the title page.
The nameplate is fixed on the bottom of the device and contains the following:
- Name and address of manufacturer
- CE label
- Type and serial number
- Year of manufacture
- Ex-label (on Ex-version devices only) as mentioned in chapter 2.2.
- It is important for enquiries and replacement part orders to specify article
number as well as serial number of the respective transmitter or sensor. This
ensures correct and quick processing.
OCM Pro CF in panel mount enclosure with S4/M4 backplane:
OCM Pro CF in wall mount enclosure with S3/M3 backplane:
OCM Pro CF in wall mount enclosure with S4/M4 backplane:
Ex type plate:
Fig. 3-1 OCM Pro CF nameplate

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Instruction Manual
OCM Pro CF
Page 14 OCM Pro CF - Rev. 07 as of 04.12.2012
This instruction manual is a part of the device and must be available for the
user at any time.
The safety instructions contained therein must be followed.
For installation and proper operation of the complete system additionally use
the technical instructions for correlation sensors as well as the installation
instruction for pipe and wedge sensors beyond this instruction manual.
It is strictly prohibited to disable the safety installations or to change the way
they work.
3.3 Installation of Spare Parts and Parts subject to wear and tear
We herewith particularly emphasize that replacement parts or accessories,
which are not supplied by us, are not certified by us, too. Hence, the installation
and/or the use of such products may possibly be detrimental to the device’s abil-
ity to work or even lead to instrument failure.
Damages or measurement errors caused by the use of non-original parts and
non-original accessories are left at user’s risk.
3.4 Turn-off procedure
For maintenance, cleaning and repairs (authorised staff personnel only!) the
device shall be disconnected from mains.
3.5 User’s Responsibilities
In the EEA (European Economic Area) national implementation of the frame-
work directive 89/391/EEC and corresponding individual directives, in particu-
lar the directive 89/655/EEC concerning the minimum safety and health re-
quirements for the use of work equipment by workers at work, as amended,
are to be observed and adhered to.
In Germany the Industrial Safety Ordinance must be observed.

Instruction Manual
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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 15
The customer shall obtain any local operating permits required and observe
the provisions contained therein.
In addition to this, he must observe local laws and regulations on
- personnel safety (accident prevention regulations)
- safety of work materials and tools (safety equipment and maintenance)
- disposal of products (laws on wastes)
- disposal of materials (laws on wastes)
- cleaning (cleansing agents and disposal)
- environmental protection
Connections:
Before operating the device the user has to ensure, that the local regulations
(e.g. for operation in channels) on installation and initial start-up are taken into
account, if this is both carried out by the user.
4 Functional Principle
4.1 General
The OCM Pro CF is a stationary measurement system for flow measurement
and storage of the detected measurement data. Type M4 additionally allows to
use a 3-step controller to drive a slide valve or similar flow control actuator. Fur-
thermore up to 4 external measurement values can be stored. Wall mount en-
closure units can be accessed remotely using the TCPIP protocol via Internet.
The device is designed to be used for measurements primarily in slight to heavy
polluted media with various compositions. It can be operated in part filled and full
channels and pipes with various shapes and dimensions.
The method of flow velocity investigation is based on the ultrasound reflection
principle. Hence, it is indispensable for the system to work that there are parti-
cles in the water, which are able to reflect the ultrasonic signal sent by the
sensor (dirt particles, gas bubbles or similar).
The OCM Pro CF type S4 either uses a POA or a CS2 sensor which simultane-
ously determine flow velocity and flow level. Alternatively, a CSM sensor in con-
junction with the electronic box EBM may be connected, which however merely
is a flow velocity sensor.
Type M4 allows to connect up to 3 POA or CS2 sensors or type EBM electronic
boxes with type CSM sensors at the same time to accurately detect the flow ve-
locity at one common measurement point.

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Instruction Manual
OCM Pro CF
Page 16 OCM Pro CF - Rev. 07 as of 04.12.2012
Fig. 4-1 Possible combinations OCP type S4
Fig. 4-2 Possible combinations OCP type M4

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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 17
A maximum of one air-ultrasonic sensor type OCL or DSM (with EBM) may be
connected to a measurement system.
1 Mounting plate
2 Acoustic coupling layer
3 Temperature sensor
4 Flow velocity sensor
5 Water-ultrasonic level sensor (optional)
6 Electronics
7 Pressure measurement cell (optional)
8 Duct for pressure measurement (optional)
9 Cable gland
Fig. 4-3 Combi sensor type POA with pressure measurement cell
1 Mounting plate
2 Acoustic coupling layer
3 Temperature sensor
4 Flow velocity sensor for positive flow direction
5 Water-ultrasonic level sensors (optional)
6 Flow velocity sensor for negative flow direction
7 Electronics
8 Pressure measurement cell (optional)
9 Duct for pressure measurement (optional)
10 Protective cover for sensor cable and protective hose fastening
11 Sensor cable
12 Protective hose (optional)
Fig. 4-4 Combi sensor type CS2 with pressure measurement cell

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Page 18 OCM Pro CF - Rev. 07 as of 04.12.2012
1 Ground plate
2 Acoustic coupling layer
3 Temperature sensor
4 Flow velocity sensor
5 Cable gland
6 Sensor cable
Fig. 4-5 Flow velocity sensor, type CSM
4.2 Level measurement using water ultrasound
Depending on the selected sensor type, the water-ultrasonic combi sensor may
contain up to 2 different built-in level measurements: water-ultrasonic and hy-
drostatic level measurement. In this case type POA contains one sensor crystal;
type CS2 uses 2 sensor crystals with different dimensions.
The sensor type CSM does not have an optional level measurement available, it
is a pure flow velocity sensor.
The water-ultrasonic level measurement uses one or more horizontal sensor
crystal(s) utilising the ultrasonic transit time method. Here the period between
transmission and reception of a signal reflected from the water surface is meas-
ured.
2
•l
t
c
h
l
=
h
= filling level
c
= sound transit time
t
1
= time between transmit and receive signal
The sound travel time in water is 1480 m/s (4.85 fps) at 20 °C (68 °F). The di-
vergence depending on the temperature is 0.23 % per Kelvin.
To ensure a level measurement which is accurate to the millimetre, the medium
temperature is constantly investigated and the sound transit time is corrected re-
spectively for calculation purposes. The fixed level, which is determined by the
sensor crystal position, is added to the determined value h1. This results in the
total level h.

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OCM Pro CF - Rev. 07 as of 04.12.2012 Page 19
4.3 Level Measurement using Pressure
Depending on the type of sensor used, the sensor may have an additional inte-
grated hydrostatic level measurement available.
The piezoresistive pressure sensor used operates according to the relative
pressure principle, where the pressure of the standing water column above the
sensor is directly proportional to the fill level. Fluctuations of the atmospheric
pressure are compensated by using a small pipe integrated within the sensor
cable. This small pipe is exposed to the atmosphere.
This sensor enables to measure fill levels even if the combi sensor is installed
out of the channel bottom centre.
During initial start-up procedure the sensor is going to be calibrated by using a
manually investigated reference value. An additional height due to the sensor in-
stallation position will be added as well.
4.4 Flow Velocity Detection
The piezo crystal which has a slope towards the flow direction operates as a
flow velocity sensor. Here an ultrasonic burst with a defined angle is sent into
the medium. All the particles in the measurement path (air, dirt, suspended sol-
ids) reflect a small amount of the ultrasonic signal. Depending on shape and size
of the particle a particular signal results. Hence, the multitude of the reflected
signals results in a reflection pattern (see Fig. 4-6). This pattern is going to be
received by the piezo crystal again, converted to electric signals and loaded into
a digital signal processor (DSP) which is built in the active sensor.
Fig. 4-6 Situation at first signal reception
After a certain period a second ultrasonic burst is sent into the medium. The
newly generated reflection signal is saved in the DSP too.
In various flow levels there are different flow velocities (flow velocity profile). De-
pending on the level, the reflecting particles’ movement away from the first
measurement point therefore varies. Hence, a distorted reflection pattern results
(see Fig. 4-7). At the same time slightly different reflections occur: some parti-
cles have been turning around and thus have another shape of reflection; some
particles are no longer within the measurement range and others have now
moved into the measurement range.

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Page 20 OCM Pro CF - Rev. 07 as of 04.12.2012
Fig. 4-7 Situation at second signal detection
The DSP checks both the received reflection patterns for similarities using the
cross correlation method. All existing signal differences are rejected so that two
similar but temporarily offset signal patterns are left for velocity evaluation.
Depending on the flow levels both patterns are subdivided into up to 16 meas-
urement windows. Then, in each measurement window the lag ∆t of the signal
pattern is investigated (see Fig. 4-8).
Fig. 4-8 Echo signal images and evaluation
Based on the beam angle, the interval between both transmitted signals and the
lag of the signal pattern therefore in each single measurement window the flow
velocity can be determined.
Stringing the single flow velocities together mathematically results in the flow
profile of the acoustic path which then is indicated on the OCM Pro display and
can be read there for inspection and control purposes.
Fig. 4-9 Investigated flow profile