KROHNE OPTIWAVE-M 7400 C Supplement

24 GHz Radar (FMCW) Level Transmitter foragitated and
corrosive liquids
© KROHNE 02/2019 - MA OPTIWAVE-M7400 C R01 en
Short guide

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◆
◆ IMPRINT :::::::::::::::::::::::::::::::::::::
All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without the
prior written authorisation of KROHNE Norway AS, Dept.: KROHNE Marine.
Subject to change without notice.
Copyright 2019 by
KROHNE Marine – Strømtangveien 21 – 3950 Brevik (Norway)

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OPTIWAVE-M 7400 C
CONTENTS
1 Safety instructions 5
1.1 Software history...........................................................................................................................5
1.2 Intended use ................................................................................................................................5
1.3 Certification..................................................................................................................................6
1.4 Radio approvals............................................................................................................................6
1.4.1 European Union (EU) ......................................................................................................................... 6
1.4.2 U.S.A. and Canada.............................................................................................................................. 9
1.5 Safety instructions from the manufacturer ...............................................................................12
1.5.1 Copyright and data protection......................................................................................................... 12
1.5.2 Disclaimer ........................................................................................................................................ 12
1.5.3 Product liability and warranty.......................................................................................................... 13
1.5.4 Information concerning the documentation ................................................................................... 13
1.5.5 Warnings and symbols used ............................................................................................................ 14
1.6 Safety instructions for the operator ..........................................................................................14
2 Installation 15
2.1 How to turn or remove the signal converter .............................................................................15
3 Start-up 16
3.1 How to start the device..............................................................................................................16
3.2 Operating concept .....................................................................................................................16
3.3 Digital display screen .................................................................................................................17
3.3.1 Display screen layout ....................................................................................................................... 17
3.3.2 Keypad buttons................................................................................................................................ 18
4 Operation 21
4.1 User modes ................................................................................................................................21
4.2 Normal mode .............................................................................................................................21
4.3 Program mode ...........................................................................................................................24
4.3.1 General notes................................................................................................................................... 24
4.3.2 Protection of the device settings (access levels) ............................................................................. 25
4.3.3 How to get access to the Quick Setup menu ................................................................................... 27
4.3.4 Keypad functions ............................................................................................................................. 28
4.3.5 How to save settings changed in Program mode............................................................................. 31
4.3.6 Menu overview ................................................................................................................................ 32
4.3.7 Function description ........................................................................................................................ 38
4.4 Further information on device configuration in Program mode ...............................................58
4.4.1 Standard setup................................................................................................................................. 58
4.4.2 Empty spectrum recording .............................................................................................................. 61
4.4.3 How to make a filter to remove radar signal interference .............................................................. 64
4.5 Status messages and diagnostic data ........................................................................................65

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CONTENTS
OPTIWAVE 7400C
5 Service 72
5.1 Periodic maintenance ............................................................................................................... 72
5.1.1 General notes................................................................................................................................... 72
5.1.2 How to clean the top surface of the device ..................................................................................... 72
5.1.3 How to clean horn antennas under process conditions .................................................................. 72
5.1.4 Heating or cooling horn antennas under process conditions .......................................................... 73
5.2 Service warranty ........................................................................................................................73
5.3 Spare parts availability...............................................................................................................74
5.4 Availability of services................................................................................................................74
5.5 Returning the device to the manufacturer ................................................................................74
5.5.1 General information......................................................................................................................... 74
5.5.2 Form (for copying) to accompany a returned device....................................................................... 75
5.6 Disposal......................................................................................................................................75
6 Appendix 76
6.1 Glossary......................................................................................................................................76

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1.1 Software history
"Firmware revision" agrees with NAMUR NE 53. It is a series of numbers used to record the revision
status of embedded software (firmware) in electronic equipment assemblies. It gives data on the type of
changes made and the effect that changes have on compatibility.
Data about software revisions is shown in menu 1.1.0 IDENT. For more data, refer to Function
description on page 38. If it is not possible to refer to the device menu, record the serial number of the
device (given on the device nameplate) and speak to the supplier.
Changes and effect on compatibility
1
Downwards compatible changes and fault repair with no effect on operation (e.g. spelling mistakes on
display)
2-_
Downwards compatible hardware and/or software change of interfaces:
H
HART®
P
Profibus
F
FOUNDATION fieldbus
3-_
Downwards compatible hardware and/or software change of inputs and outputs:
CO Current output
FO,
PO
Frequency output / pulse output
SO Status output
LS Limit switch
CI Current input
D Display
Release
date
Printed circuit
assembly
Firmware
revision
Electronic
revision
Hardware
revision
Changes and
compatibility
Documentation
2017-02-02 HMI (LCD display
option)
BL1.24.04 ER1.0.06
4002905801a
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7400 R01
Main and Support 4002815701d
Sensor 4002859301a
1 If the device does not have the display module option, the module reference number is 4002905802a
1.2 Intended use
CAUTION!
Responsibilityfortheuseofthe measuringdeviceswithregardtosuitability,intendeduseand
corrosion resistance of the used materials against the measured fluid lies solely with the operator.
INFORMATION!
Themanufacturerisnotliableforanydamageresultingfromimproperuseoruseforotherthan the
intended purpose.
This radar level transmitter measures distance, level, mass, volume and reflectivity of liquids, pastes and
slurries.
It can be installed on tanks, reactors and open channels.

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1.3 Certification
DANGER!
Fordevicesusedinhazardousareas,additionalsafetynotesapply;pleaserefertotheEx
documentation.
CE marking
The device meets the essential requirements of the EU Directives:
• Electromagnetic Compatibility (EMC) directive
• The safety part of the Low-Voltage directive
• For devices used in hazardous locations: ATEX directive
The manufacturer certifies successful testing of the product by applying the CE marking. For more data
about the EU Directives and European Standards related to this device, refer to the EU Declaration of
Conformity. You can download this document free of charge from the website (Download Center).
All devices are based on the CE marking and meet the requirements of NAMUR
Recommendations NE 21, NE 43, NE 53 and NE 107.
1.4 Radio approvals
1.4.1 European Union (EU)
INFORMATION!
LPR (LevelProbingRadar) devicesmeasure levelintheopenair or inaclosedspace(ametallic tank etc.).
TLPR (TankLevel ProbingRadar) devices measure level in aclosed space only. You canuseLPRdevices
forTLPRapplications.TheLPRandTLPRdevicesmeettherequirementsof the RED (Radio Equipment
Directive) for use in the member countries of the EU.
This level transmitter is approved to be used outside metallic tanks. If you use the device in the open air,
read the device nameplate to make sure that the device can be used for your application. Only the
antennas that follow are permitted for open-air applications:
Antenna type Order code
316L / DN80 (3¨) Metallic Horn VFDExxxxxxxxxxxxx4xxx...
316L / DN100 (4¨) Metallic Horn VFDExxxxxxxxxxxxx5xxx...
316L / DN150 (6¨) Metallic Horn VFDExxxxxxxxxxxxx6xxx...
316L / DN200 (8¨) Metallic Horn VFDExxxxxxxxxxxxx7xxx...
PTFE / DN80 (3¨) Drop VFDExxxxxxxxxxxxxExxx...
PTFE / DN100 (4¨) Drop VFDExxxxxxxxxxxxxFxxx...
PTFE / DN150 (6¨) Drop VFDExxxxxxxxxxxxxGxxx...
PEEK / DN80 (3¨) Drop VFDExxxxxxxxxxxxxKxxx...

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S/N: xxxxxxxxxxxxxxxxxxx
Manufacturing
date: YYYY-MM-DD
Tag
No:
Figure 1-1: European Union: radio approval information on the nameplate
1 Type code (defined in order).
2 HVIN (Hardware Version Identification Number). This number gives the radar signal frequency (24G = 24 GHz), the lo- cation of
the device (T=TLPR or L=LPR) and the type of signal converter (compact (C))
TLPR device: HVIN: 24G-T-C
LPR device: HVIN: 24G-L-C
3 CE sign
TLPR (Tank Level Probing Radar) devices only
Use approved personnel to install the device. The device and the tank agree with the RED (Radio Equipment
Directive) if you obey the instructions that follow:
• TLPR (Tank Level Probing Radar) are required to be installed at a permanent fixed position at a closed
(not open) metallic tank or reinforced concrete tank, or similar enclosure structure made of
comparable attenuating material;
• flanges and attachments of the TLPR equipment shall provide the necessarymicrowave sealing
by design;
• sight glasses shall be coated with a microwave-proof coating when necessary (i.e. electrically
conductive coating);
• manholes or connection flanges at the tank shall be closed to ensure a low-level leakage of the
signal into the air outside the tank;
• whenever possible, mounting of the TLPR equipment shall be on top of the tankstructure with
the orientation of the antenna to point in a downward direction;
• installation and maintenance of the TLPR equipment shall be performed by professionally trained
individuals only.
For data about how to install EMI/RFI shielding gaskets, refer to the instructions supplied with this
accessory.

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LPR (Level Probing Radar) devices only
Use approved personnel to install the device. If the device is operated in the open air (outdoors), it
agrees with the RED (Radio Equipment Directive) if you obey these instructions:
• The antenna must always point downwards. The boresight direction of the antenna must be vertical. No
other angles are permitted.
• Install the device more than 4 km / 2.485 mi away from radio astronomy sites.
• If the device is 4...40 km / 2.485. 24.855 mi away from radio astronomy sites, do not install the
device more than 15 m / 49.21 ft above the ground.
CAUTION!
If itis necessary to install the device less than 4 km / 2.485 mifrom radio astronomy sites, you must get
the approval of the national regulatory authority before installation (e.g. ANFR (France),
Bundesnetzagentur (Germany), Ofcom (United Kingdom) etc.).
Radio quiet zones: locations of radio astronomy sites (stations) in Europe and northern Eurasia
Country Name of the station Location
Latitude, ϕ Longitude, λ
Finland Metsähovi 60°13'04" N 24°23'37" E
Tuorla 60°24'56" N 22°26'31" E
France Plateau de Bure 44°38'01" N 05°54'26" E
Germany
Effelsberg
50°31'32" N
06°53'00" E
Hungary
Penc
47°47'22" N
19°16'53" E
Italy
Medicina
44°31'14" N
11°38'49" E
Noto
36°52'34" N
14°59'21" E
Sardinia
39°29'50" N
09°14'40" E
Latvia
Ventspils
57°33'12" N
21°51'17" E
Poland
Kraków – Fort Skala
50°03'18" N
19°49'36" E
Russia Dmitrov 56
°
26'00" N 37
°
27'00" E
Kalyazin
57°13'22" N
37°54'01" E
Pushchino
54°49'00" N
37°40'00" E
Zelenchukskaya 43
°
49'53" N 41
°
35'32" E
Spain Yebes 40
°
31'27" N 03
°
05'22" W
Robledo 40
°
25'38" N 04
°
14'57" W
Switzerland Bleien 47
°
20
’
26" N 08
°
06
’
44" E
Sweden Onsala 57
°
23
’
45" N 11
°
55
’
35" E
UK Cambridge 52
°
09'59" N 00
°
02'20" E
Darnhall 53°09'22" N 02°32'03" W
Jodrell Bank 53°14'10" N 02°18'26" W
Knockin 52°47'24" N 02°59'45" W
Pickmere 53°17'18" N 02°26'38" W

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1.4.2 U.S.A. and Canada
INFORMATION!
LPR (LevelProbingRadar) devicesmeasure levelintheopen air or inaclosedspace(ametallic tank etc.).
TLPR (Tank Level Probing Radar) devices measure level in a closed space only.
This level transmitter is approved to be used outside metallic tanks. If you use the device in the open air,
read the device nameplate to make sure that the device can be used for your application. Only the
antennas that follow are permitted for open-air applications:
Antenna type Order code
316L / DN80 (3¨) Metallic Horn
VFDExxxxxxxxxxxxx4xxx...
316L / DN100 (4¨) Metallic Horn
VFDExxxxxxxxxxxxx5xxx...
316L / DN150 (6¨) Metallic Horn
VFDExxxxxxxxxxxxx6xxx...
316L / DN200 (8¨) Metallic Horn
VFDExxxxxxxxxxxxx7xxx...
PTFE / DN80 (3¨) Drop
VFDExxxxxxxxxxxxxExxx...
PTFE / DN100 (4¨) Drop
VFDExxxxxxxxxxxxxFxxx...
PTFE / DN150 (6¨) Drop
VFDExxxxxxxxxxxxxGxxx...
PEEK / DN80 (3¨) Drop
VFDExxxxxxxxxxxxxKxxx...
LEGAL NOTICE!
FCC
ThisdevicecomplieswithPart15of the FCC Rules.Operationissubjecttothe followingtwo
conditions:
1. This device may not cause harmful interference,and
2. this device must accept any interference received, including interference which may cause un- desired
operation.
Changes or modifications made to this equipment not expressly approved by the manufacturer may
void the FCC authorizations to operate this equipment.
This equipment has beentested and found to complywith the limits for aClass B digital device, pursuant
toPart15oftheFCCRules.Theselimitsaredesignedtoprovidereasonableprotection againstharmful
interferenceinaresidentialinstallation.Thisequipmentgenerates,usesand can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interferencetoradiocommunications. However,there is no guarantee that interference will
not occur in a particular installation. If this equipment does causeharmfulinterferencetoradioor
televisionreception,whichcanbedeterminedbyturning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet onacircuitdifferentfrom thattowhichthe receiveris
connected.
• Consult the dealer or an experienced radio/TV technician for help.

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LEGAL NOTICE!
IC
This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following conditions:
1. This device may not cause harmful interference,and
2. this device must accept any interference received, including interference that may cause un- desired
operation.
ThisdeviceandthehandbookcomplieswiththerequirementsofRSS-Gen.Operationissubject to the
conditions that follow:
1. The installation of the LPR/TLPR device shall be done by trained installers, in strict compliance with the
manufacturer’s instructions.
2. The use of this device is on a "no-interference, no-protection" basis. That is, the user shall ac- cept
operationsofhigh-poweredradarinthesamefrequencybandwhichmayinterferewithor
damage this
device. However, devices found to interfere with primary licensing operations will
be required to be
removed at the user’s expense.
3. TheTLPRdeviceshallbeinstalledandoperatedinacompletelyenclosedcontainertoprevent RF
emissions, which can otherwise interfere with aeronautical navigation.
4. LPRdevices:Ensureaverticallydownwardorientationofthetransmitantennaandaninstal- lation
only at fixed locations.
5. Theinstaller /userofthisdevice shallensure thatitisatleast10kmfromtheDominionRadio
AstrophysicalObservatory(DRAO)nearPenticton, BritishColumbia.Thecoordinatesofthe DRAOare
latitude49°19'15"Nandlongitude119°37'12"W.Fordevicesnotmeetingthis10km separation(e.g.
thoseintheOkanaganValley,BritishColumbia)theinstaller/usermustcoor- dinatewith,andobtain
thewritten concurrenceof,the Directorof theDRAO beforetheequip- mentcanbeinstalledor
operated.TheDirectoroftheDRAOmaybecontactedat250-497-2300
(tel.) or 250-497-2355 (fax).
Alternatively, the Manager, Regulatory Standards, Industry Canada,
may be contacted.
The Product Marketing Name (PMN) of this device is "Optiwave x400 series".

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S/N:
xxxxxxxxxxxxxxxxxxx
Manufacturing
date: YYYY-MM-DD
Tag
No:
Figure 1-2: U.S.A. and Canada: radio approval information on the nameplate
1 Type code (defined in order).
2 HVIN (Hardware Version Identification Number). This number gives the radar signal frequency (24G = 24 GHz), the lo- cation of
the device (T=TLPR or L=LPR) and the type of signal converter (compact (C))
TLPR device: HVIN: 24G-T-C
LPR device: HVIN: 24G-L-C
3 FCC ID and IC number
TLPR device: FCC-ID:Q6BFMCW24G74T, IC number: 1991D-FMCW24G74T LPR
device: FCC-ID: Q6BFMCW24G74L, IC number: 1991D-FMCW24G74L

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1.5 Safety instructions from the manufacturer
1.5.1 Copyright and dataprotection
The contents of this document have been created with great care. Nevertheless, we provide no guarantee
that the contents are correct, complete or up-to-date.
The contents and works in this document are subject to copyright. Contributions from third parties are
identified as such. Reproduction, processing, dissemination and any type of use beyond what is
permitted under copyright requires written authorisation from the respective author and/or the
manufacturer.
The manufacturer tries always to observe the copyrights of others, and to draw on works created in-
house or works in the public domain.
The collection of personal data (such as names, street addresses or e-mail addresses) in the
manufacturer's documents is always on a voluntary basis whenever possible. Whenever feasible, it is
always possible to make use of the offerings and services without providing any personal data.
We draw your attention to the fact that data transmission over the Internet (e.g. when communicating
by e-mail) may involve gaps in security. It is not possible to protect such data completely against access
by third parties.
We hereby expressly prohibit the use of the contact data published as part of our duty to publish an
imprint for the purpose of sending us any advertising or informational materials that we have not
expressly requested.
1.5.2 Disclaimer
The manufacturer will not be liable for any damage of any kind by using its product, including, but not
limited to direct, indirect or incidental and consequential damages.
This disclaimer does not apply in case the manufacturer has acted on purpose or with gross negligence.
In the event any applicable law does not allow such limitations on implied warranties or the exclusion of
limitation of certain damages, you may, if such law applies to you, not be subject to some or all of the
above disclaimer, exclusions or limitations.
Any product purchased from the manufacturer is warranted in accordance with the relevant product
documentation and our Terms and Conditions of Sale.
The manufacturer reserves the right to alter the content of its documents, including this disclaimer in any
way, at any time, for any reason, without prior notification, and will not be liable in any way for possible
consequences of such changes.

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1.5.3 Product liability and warranty
The operator shall bear responsibility for the suitability of the device for the specific purpose. The
manufacturer accepts no liability for the consequences of misuse by the operator. Improper installation
or operation of the devices (systems) will cause the warranty to be void. The respective "Standard Terms
and Conditions" which form the basis for the sales contract shall also apply.
1.5.4 Information concerning thedocumentation
To prevent any injury to the user or damage to the device it is essential that you read the information
in this document and observe applicable national standards, safety requirements and accident
prevention regulations.
If this document is not in your native language and if you have any problems understanding the text, we
advise you to contact your local office for assistance. The manufacturer can not accept responsibility for
any damage or injury caused by misunderstanding of the information in this document.
This document is provided to help you establish operating conditions, which will permit safe and efficient use
of this device. Special considerations and precautions are also described in the document, which appear in
the form of icons as shown below.

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1.5.5 Warnings and symbolsused
Safety warnings are indicated by the following symbols.
DANGER!
This warning refers to the immediate danger when working with electricity.
DANGER!
This warning refers to the immediate danger of burns caused by heat or hot surfaces.
DANGER!
This warning refers to the immediate danger when using this device in a hazardous atmosphere.
DANGER!
These warningsmustbeobservedwithoutfail.Evenpartialdisregardofthis warning can lead to serious
health problems and even death. There is also the risk of seriously damaging the device or parts of the
operator's plant.
WARNING!
Disregardingthis safetywarning,evenif onlyinpart,posestheriskofserioushealthproblems. There is
also the risk of damaging the device or parts of the operator's plant.
CAUTION!
Disregardingtheseinstructionscanresultindamage tothedeviceortopartsoftheoperator's plant.
INFORMATION!
These instructions contain important information for the handling of the device.
LEGAL NOTICE!
This note contains information on statutory directives and standards.
• HANDLING
This symbol designates all instructions for actions to be carried out by the operator in the
specified sequence.
i RESULT
This symbol refers to all important consequences of the previous actions.
1.6 Safety instructions for the operator
WARNING!
In general, devices from the manufacturer may only be installed, commissioned, operated and
maintained by properly trained and authorized personnel.
Thisdocumentisprovidedtohelpyouestablishoperatingconditions,whichwillpermitsafeand efficient
use of this device.

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OPTIWAVE-M7400C
INSTALLATION 2
2.1 How to turn or remove the signal converter
INFORMATION!
Theconverterturns360°.Theconvertercanberemovedfromtheprocessconnectionassembly under
process conditions.
Figure 2-1: How to turn or remove the signal converter
1 Tool: 5 mm Allen wrench (not supplied)
2 Cover for the wave guide hole on top of the process connection assembly (not supplied)
CAUTION!
Ifyouremovetheconverter, putacoveronthewave guidehole ontopoftheprocessconnection assembly.
Makesurethattheconverterisfullyengagedwhenyouattachittotheprocessconnection assembly.
Then tighten the lock screw.

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3 START-UP
OPTIWAVE-M 7400 C
3.1 How to start the device
• Connect the converter to the power supply.
• Energize the converter.
i DeviceswiththeLCDdisplayoptiononly:After10secondsthescreenwilldisplay"Optiwave 7400"
and the logo of the supplier. After 40 seconds the default screen will appear. The devicewillshow
measurementdata.Measurementsagreewithspecificationsgiveninthe customer order.
CAUTION!
If the manufacturer received data about the installation, the device will display readings correctly.If
not,gotosub-menuA.4ApplicationAssistantintheconfigurationmenutoselectthe correct settings.
3.2 Operating concept
You can read measurements and configure the device with:
• A digital display screen (optional).
• A connection to a system or PC with PACTware™. You can download the Device Type
Manager (DTM) file from the website.
• A connection to a system or PC with AMS™. You can download the Device Description (DD) file
from the website.
• A connection to a HART® Field Communicator. You can download the Device Description (DD) file
from the website.

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OPTIWAVE-M7400C
START-UP 3
3.3 Digital display screen
If you remove the housing cover, you can push the buttons on the keypad. If you cannot remove the
housing cover, you can operate the keypad with a bar magnet. For more data, refer to Keypad buttons on
page 18.
3.3.1 Display screen layout
Display in Normal mode
Figure 3-1: Display screen layout in Normal mode (measurement data)
1 Current output percentage (bar graph)
2 Device status (NAMUR NE 107 symbols)
3 Device tag name
4 Keypad operation indicator (shown when you push a button or operate the keypad with a bar magnet)
5 Measurement value and units
6 Keypad buttons with Hall effect sensors (sensors sensitive to large changes in magnetic field strength)
The output percentage bar graph is only shown if you set "One Value and Bar" or "Two Values and Bar"
in menu items C6.4.1 Function (1st Meas. page) or C6.5.1 Function (2nd Meas. Page). If menu item
C6.4.2 1st Value Variable (1st Meas. page) is set to "Level", then the device shows "Level" as the current
output percentage in Normal mode (refer to item
1 in the illustration).

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3 START-UP
OPTIWAVE-M 7400 C
Display in Programmode
Figure 3-2: Display screen layout in Program mode
1 Menu number or menu item number
2 Location (menu) of sub-menu or menu item
3 Menu item name
3.3.2 Keypad buttons
Functions of keypad buttons
Keypad button Symbol Function
[Right]
[>] Normal mode: Enter Program mode
Program mode:
Menu: Enter the sub-menu or menu item
Menu item: Move cursor one digit to the right (this includes the
decimal point). If the cursor is on the last digit, a push of this button
will move the cursor to the first digit.
[Return]
[ ^ ] Normal mode: None
Program mode:
Menu: Exit the menu. If you are in the top level menu, the device goes
back to Normal mode.
Menu item: Confirm change and exit the menu item.
[Escape]
[ > ]+[

] Normal mode: None
Program mode:
Menu: Exit the menu.
Menu item: Exit the menu item. This step also cancels the change
made to the setting in the menu item.
[Down]
[ ] Normal mode: Change screen (measurement pages 1 and 2 and the
status message page)
Program mode: Decrease value or change parameter
[Up]
[

] Normal mode: Change screen (measurement pages 1 and 2 and the
status message page)
Program mode: Increase value or change parameter
For more data on keypad functions, refer to Keypad functions on page 28.

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OPTIWAVE-M7400C
START-UP 3
How to push the keypad buttons with your hand
Figure 3-3: How to push the keypad buttons with your hand
Equipment needed
• Cover wrench
1 Remove the housing cover with the cover wrench supplied with the device.
2 Push the buttons on the keypad.
i This will operate the device.

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3 START-UP
OPTIWAVE-M 7400 C
How to operate the keypad buttons with a bar magnet
Figure 3-4: How to operate the keypad buttons with a bar magnet
Equipment needed
• Bar magnet
INFORMATION!
It is not necessary to remove the display housing cover to do this procedure.
• Hold the bar magnet near to a keypad button.
i Thekeypadbuttonwilloperate.Ifyoumustoperatethebuttonmorethanonetime,remove
the bar magnet and then hold it near to the button again.