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Operating Instructions

Treatment of measurement errors on solids

The table below contains typical examples of application-based measurement errors on solids.
A distinction is made between measurement errors in the following states:

•

Constant level

•

Filling

•

Discharging

The figures in the column headed "

Error pattern

" each show the actual level in a broken line and the level

shown by the sensor in an unbroken line.

1
2

Level

time

1 Actual level
2 Level indicated by the sensor

Notes:

•

Whenever the sensor shows a constant value, the cause could also be the fault setting of the current
output to "

Hold value

•

If the level shown is too low the cause could also be excessive cable resistance.

Error description

Error pattern

Cause

Remedy

1. Measurement

value shows level too

low or too high

- Min. / Max. adjustment incorrect

- Correct Min. / Max. adjustment

- Linearization curve incorrect

- Adjust linearization curve

2. Measurement

value jumps towards

100 %

- The amplitude of the product echo

falls due to the process
- The false signal suppression

process has not been completed

- Complete false signal

suppression process

- The amplitude or location of an

interference echo has changed

(for example condensate or

product deposits); the false signal

suppression is no longer correct

- Find the cause of the changed

interference echo and complete a

false signal suppression process

with condensate, for example

Leve

time

Level

time

7.4 Measurement errors with a constant level

Содержание Nico 15

Страница 1: ...SWR engineering Messtechnik GmbH EN Operating Instructions Nico 15 30 Radar sensor for the continuous level measurement of solids ...

Страница 2: ...pe 5 3 Product description 3 1 How it works 5 4 Installation 4 1 General instructions 8 4 2 Installation preparations horn antenna 8 4 3 Installation instructions 9 4 4 Installation bar 10 5 Connect to the voltage supply 5 1 Preparing the connection 21 5 2 Connecting 21 5 3 Single chamber housing connection diagram 23 5 4 Switch on phase 23 6 Commissioning with the display and control module 6 1 F...

Страница 3: ...g 39 7 6 Measurement errors during discharge 39 8 Annex 8 1 Technical data 41 8 2 Dimensions 45 Safety instructions for potentially explosive atmospheres Refer to the specific explosion protection instructions for use in potentially explosive atmospheres These are an integral part of the operating instructions and are supplied with every device licensed for operation in potentially explosive atmos...

Страница 4: ...mark special information for applications in potentially explosive atmospheres List The initial dot denotes a list with no binding order Action This arrow denotes a single action Action sequence Preceding numbers denote actions to be performed in sequence Battery disposal This symbol is used to mark special information for the disposal of batteries 2 For your safety 2 1 Authorised personnel All th...

Страница 5: ... the internationally permitted limit values If used correctly the device is not expected to cause any health problems 2 5 CE conformity The device satisfies the requirements of the relevant EC directives We confirm that it has been tested successfully by applying the CE mark The device is designed for use in an industrial environment During such operation cable based and radiated interference must...

Страница 6: ...nstallation Electrical connection 1 Ensure that the voltage supply is identical to the details on the model plate 2 Connect the device as shown in the following figure For further information see the section entitled Connect to the voltage supply Set the parameters 1 Go to the Setup menu using the display and control module 2 Using the Medium menu point select the medium for your application for e...

Страница 7: ...st be entered for the minimum and maximum fill level If you do not know these values it is also possible to make the adjustment using distances for example of 10 and 50 The starting point for these distance details is always the sealing surface of the thread or flange Further steps 1 Set the required damping of the output signal in the Additional adjustments menu Damping menu point 2 Select the ou...

Страница 8: ...de the process pressure process temperature and the chemical properties of the media Details of these are set out in the section entitled Technical data and on the model plate 4 2 Installation preparations horn antenna The device is also supplied in versions in which the antenna has a larger diameter than the process connection thread or flange Before installation therefore the antenna must be rem...

Страница 9: ...position which is at least 200 mm from the vessel wall If you are unable to install it this far away from the wall you should save the interference signal during the commissioning procedure This particularly applies if you expect material to accumulate on the vessel wall In this case we recommend that process of saving the interference signal is repeated at a later date when material has accumulat...

Страница 10: ...nd must be mounted on the sensor before commissioning using the three Allen bolts M5 x 10 and spring washers For details of the maximum tightening torque see the section entitled Technical data Tools required Allen key size 4 There are two methods of securing the bar to the sensor Depending on the method you choose the sensor can be swung in the bar as follows Single chamber housing Tilt angle 180...

Страница 11: ...n silos Alignment To ensure that the sensor can cover as much of vessel volume as possible the sensor should be aligned so that the measuring beam reaches the lowest vessel level in other words the discharge Fig 11 Installation in an open vessel ...

Страница 12: ...enna projects slightly out of the socket Fig 13 Radar sensor installation with inflowing solids Socket for plastic antenna A union flange for DN 80 and a suitable adapter flange are available for installing the Nico 15 on a socket The collar flange may be mounted directly above the housing on the aluminium single chamber housing version Retrofitting is not possible on the aluminium twin chamber ho...

Страница 13: ...t also save the interference signal d h The tables below show the maximum pipe socket length h dependent on the diameter d Socket diameter d Socket length h 80 mm 300 mm 100 mm 400 mm 150 mm 500 mm Tip For new systems it is a good idea to angle the vessel socket towards the discharge This results in less interference reflection from the vessel wall and measurements are possible right into the coni...

Страница 14: ...ional interference reflection which may adversely affect the measurement result for short distances If the solids have good reflective properties you can also install the Nico 30 with a horn antenna on longer pipe sockets Guide values for socket heights are shown in the figure below After this you must also save the interference signal Fig 17 Distance between the antenna and socket for horn antenn...

Страница 15: ...ble with an antenna extension This enables the antenna length to be selected ex works or retrospectively so that the antenna end projects slightly over the end of the socket However the antenna extension will also cause interference reflection close to it This may result in a greater minimum distance particularly for poorly reflective media such as plastic powder A clean socket with the socket end...

Страница 16: ... 0 6 0 8 1 1 1 4 10 0 3 0 7 1 1 1 4 1 8 15 0 5 1 0 1 6 2 1 2 6 20 0 7 1 4 2 1 2 8 3 5 25 0 9 1 7 2 6 3 5 4 4 30 1 0 2 1 3 2 4 2 5 3 Example For a 20 m high vessel the installation position for the sensor is 1 4 m from the centre of the vessel The required tilt angle of 4 can be taken from the table Proceed as follows to set the tilt angle using the swivel mounting 1 Undo the clamp screw on the swi...

Страница 17: ...ld save the interference signal during the commissioning procedure If large vessel fittings such as bracing and supports cause interference echoes these can be damped by additional measures Small sheet metal covers installed at angles over the fittings will scatter the radar signals and thus effectively prevent direct interference echo reflection Mixer units If there is a mixer unit in the vessel ...

Страница 18: ...l If the Nico 30 is used on a moving arm you should note the maximum measuring rate see section entitled Technical data Installation in the vessel insulation Devices for a temperature range up to 250 C or up to 450 C have a spacer between the process connection and electronic housing This is designed to ensure the thermal isolation of the electronic system from the high process temperatures Inform...

Страница 19: ...5 Device installation in an underfloor box 1 Underfloor box 2 Concrete floor Installation in a multi chamber vessel The silo walls in multi chamber silos are often profile walls made of trapezoidal sheet metal for example to provide the required strength If the radar sensor is installed very close to a heavily textured vessel wall it may suffer serious interference reflections The sensor should th...

Страница 20: ...version the air is distributed through ducts in the antenna system and keeps it relatively free of dust deposits Fig 28 Purge air connection for horn antenna In practice it has been found that a pressure of approx 0 1 1 bar creates an adequate air flow External air purge on the Nico 15 Since the Nico 15 does not have a direct purge air connection a separate air purge connection must be installed i...

Страница 21: ...s inside the galvanic system and in vessels with cathodic corrosion protection In this case the two sided shield earthing may result in considerable equalising currents over the cable shield To prevent this the cable shield may be connected to just one side of the earth potential in the control cabinet for these applications The cable shield must not be connected to the internal earth terminal in ...

Страница 22: ...raight into the terminal openings Flexible cores without end ferrules should be pressed on to the terminal head with a small slotted screwdriver to release the terminal opening Removing the slotted screwdriver will close the terminals again Further information about the maximum core cross section is available in the sections entitled Technical data Electromechanical data 7 Check that the cables ar...

Страница 23: ...g the cable shield 5 4 Switch on phase After the device has been connected to the voltage supply or after the voltage supply has been restored the device will conduct a self test for approx 30 seconds Internal test of the electronic system Show the device type hardware and software version measuring point name on the display or PC Show the status message F 105 Found measurement on the display or P...

Страница 24: ...m and turn it clockwise to secure it 3 Secure the housing cover with the inspection window Proceed in reverse to remove it The display and control module is supplied by the sensor no other connection is required Fig 32 Fit the display and control module in the electronic system chamber in a single chamber housing 1 2 Fig 33 Fit the display and control module in a twin chamber housing 1 In the elec...

Страница 25: ...ey Change the value of a parameter ESC key Cancel entry Return to the higher level menu Control system You can control the sensor using the four keys on the display and control module The various menu points are displayed on the LC display The functions of the various keys are shown above Approximately 10 minutes after the last key was pressed the system will automatically return to the measuremen...

Страница 26: ...al adjustments Distance unit m Temperature unit C Measuring probe length Length of pipe ex works Linearization curve Linear HART mode Default address 0 Quick start 6 3 Parameterisation The parameterisation adjusts the device to the conditions in which it is used The parameterisation process takes place in a control menu Main menu The main menu is divided into five sections with the following funct...

Страница 27: ...ensor perfectly to the product and significantly increase measurement accuracy primarily for media with poor reflection properties Enter the required parameters using the appropriate keys save them by pressing OK and then go to the next menu point by pressing ESC and Setup Application In addition to the medium the application or place of use can also affect the measurement This menu point enables ...

Страница 28: ...s and beams Large heap angle Measurement close to the filling inflow Crusher Vessel Fittings wearing and safety equipment present Process Measuring conditions Measurement value jump for example due to filling by truck Fast reaction speed Large distance to medium Demonstration Setting for all applications which are not typical level measurements The sensor will accept any change of measurement valu...

Страница 29: ... vessel form can also affect the measurement This menu point provides a range of options for the vessel floor and roof for certain applications to adjust the sensor to these different measurement conditions Enter the required parameters using the appropriate keys save them by pressing OK and then go to the next menu point by pressing ESC and Setup Adjustment Since the radar sensor is a distance me...

Страница 30: ...ment is always carried out without changing the solids This means that these settings can be completed in advance without the device having to be installed Setup Min adjustment Proceed as follows 1 Select menu point Setup using and confirm your selection with OK Now select menu point Min adjustment using and confirm your selection with OK 2 Edit the percentage value using OK and place the cursor i...

Страница 31: ...entage value using and save it using OK The cursor will now go to the distance value 4 Enter the distance value in metres for the full vessel to match the percentage value Please note for this purpose that the maximum fill level must be underneath the minimum distance to the edge of the antenna 5 Save your settings using OK Diagnostics Peak values The minimum and maximum measurement values are sav...

Страница 32: ...f the echo over the measuring range in dB The signal strengths allows the quality of the measurement to be assessed The False signal suppression represents the saved interference echoes see Additional adjustments menu for the empty vessel with the signal strength in dB over the measuring range A comparison of the echo curve and false signal suppression enables a more precise assessment of the meas...

Страница 33: ... adversely affect the measurement High sockets Vessel fittings such as bracing Mixer units Accumulations or welds on vessel walls Note A false signal suppression records marks and saves these interference signals so that they are not taken into consideration for measuring the fill level This should be done at a low fill level so that any existing interference reflections can be recorded Proceed as...

Страница 34: ...his is a good idea if a false signal suppression was saved at too high a fill level which means that it was not possible to record all the interference echoes If you select Update the distance to the surface of the solids in the created false signal suppression will be displayed This value can now be changed and the false signal suppression can be extended to this range Additional adjustments Line...

Страница 35: ...s including special and laboratory parameters to the default values for the specific device Any created false signal suppression freely programmed linearization curve or measurement value memory will be deleted Setup Reset the parameter settings made in the Commissioning menu point to the default values for the specific device Any created false signal suppression freely programmed linearization cu...

Страница 36: ...e Function check Out of specification Maintenance and clarified by pictograms 4 1 2 3 Fig 35 Status message pictograms 1 Failure red 2 Function check orange 3 Out of specification yellow 4 Maintenance blue Failure The device will output a fault message if it detects a malfunction This status message will be active at all times The user is unable to deactivate it Function check Work is being carrie...

Страница 37: ...connection diagram The following table describes possible errors in the current signal and helps to rectify them Error Cause Remedy 4 20 mA signal not stable Level fluctuations Set the damping to suit the device using the display and control module No 4 20 mA signal Electrical connection faulty Test the connection using the section entitled Connecting and if necessary correct it using the section ...

Страница 38: ...n is too low the cause could also be excessive cable resistance Error description Error pattern Cause Remedy 1 Measurement value shows level too low or too high Min Max adjustment incorrect Correct Min Max adjustment Linearization curve incorrect Adjust linearization curve 2 Measurement value jumps towards 100 The amplitude of the product echo falls due to the process The false signal suppression ...

Страница 39: ... the installation position and sensor alignment Reflections from the surface of the goods via the vessel wall deviation Select a better installation position improve the sensor alignment for example using a swivel mounting 5 Measurement value jumps sporadically towards 100 during filling Varying condensate or dirt on the antenna Complete a false signal suppression process or increase false signal ...

Страница 40: ...ement value fluctuates by 10 20 Various echoes from a surface of the goods which is not flat for example at the discharge hopper Check the medium type application parameter and adjust it if necessary Improve the installation position and sensor alignment Reflections from the surface of the goods via the vessel wall deflection Level time 0 Level time 0 Action after fault has been remedied Depending...

Страница 41: ...connection Between earth terminal process connection and antenna Pipe thread cylindrical ISO 228 T1 G1 A to DIN 3852 A American pipe thread tapered 1 NPT 2 NPT Flanges DIN from DN 25 ANSI from 1 Weights Device depending on housing approx 2 17 2 kg 4 409 37 92 lbs process connection and antenna Antenna extension 1 6 kg m 1 157 lbs ft Max length of antenna extension 5 85 m 19 19 ft Tightening torque...

Страница 42: ...ting current 3 6 mA Load 4 20 mA HART active 500 Ω Damping 63 of input value 0 999 s adjustable Measurement accuracy to DIN EN 60770 1 Process reference conditions to DIN EN 61298 1 Temperature 18 30 C 64 86 F Relative humidity 45 75 Air pressure 860 1060 mbar 86 106 kPa 12 5 15 4 psig Installation reference conditions Minimum distance from components 200 mm 7 874 in Reflector Flat panel reflector...

Страница 43: ...hock Electromechanical data version IP 66 IP 68 1 bar Cable inlet options Cable screw connection with integral M20 x 1 5 cable ø 5 9 mm connection cable Cable inlet NPT Blind plug M20 x 1 5 NPT Connection cable Cable cross section 0 5 mm AWG 20 Core resistance 0 036 Ω m Tensile strength 1200 N 270 lbf Standard length 5 m 16 4 ft Max length 180 m 590 6 ft Min bending radius 25 mm 0 984 in at 25 C 7...

Страница 44: ...larity reversal protection Integrate Max power consumption 4 VA 2 1 W Electrical protection measures Protection type depending on IP 66 IP 68 0 2 bar 2 housing version Surge voltage category III Protection class III 2 The requirements for compliance with the protection type are the appropriate cable and correct installation ...

Страница 45: ...21 mm 0 83 ø 107 mm 4 21 Fig 38 Nico 15 collar flange to match DN 80 PN 16 ASME 3 150lbs JIS80 10K Nico 15 version with adapter flange 2 1 138 mm 5 43 31 mm 1 22 20 mm 0 79 8 mm 0 32 ø 75 mm 2 95 ø 98 mm 3 86 Fig 39 Nico 15 adapter flange 1 Adapter flange 2 Seal 8 2 Dimensions The following dimension drawings are only a selection of the possible versions ...

Страница 46: ... y G1 A 1 NPT x y 2 1 144 mm 5 67 Fig 40 Nico 30 horn antenna in threaded design 1 Standard 2 With intermediate temperature piece up to 250 C Nico 30 horn antenna in flange design x y 2 1 60 mm 2 36 mm inch 8 50 16 93 3 94 ø1 58 ø1 89 ø2 95 ø3 74 4 72 x y 100 ø40 120 ø48 216 ø75 430 ø95 1 2 3 4 x y 1 2 3 4 166 mm 6 54 Fig 41 Nico 30 horn antenna in flange design 1 Standard 2 With intermediate temp...

Страница 47: ...ø 48 216 ø 75 430 ø 95 1 2 3 4 x y 1 2 3 4 4 0 m m 1 5 8 1 4 6 m m 5 7 5 2 1 max 15 0 59 Fig 42 Nico 30 horn antenna and swivel mounting 1 Standard 2 With intermediate temperature piece up to 250 C SWR engineering Messtechnik GmbH Gutedelstraße 31 79418 Schliengen Germany Phone 49 7635 82 72 48 0 Fax 49 7635 82 72 48 48 www swr engineering com All rights reserved EN 20 10 2016 ...

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