Publication No. 2086 / Update 01.00 Mat-No. 3015953
© Copyright 2021 DEHN SE + Co KG
DEHNrecord SD
Multifunctional measurement and analysis device for monitoring power quality
Manual
Страница 1: ...Publication No 2086 Update 01 00 Mat No 3015953 Copyright 2021 DEHN SE Co KG DEHNrecord SD Multifunctional measurement and analysis device for monitoring power quality Manual ...
Страница 2: ...Page 2 from 69 Imprint Manufacturer DEHN SE Co KG Hans Dehn Str 1 92306 Neumarkt Germany Tel 49 9181 906 0 www dehn de Service Hotline Technical Support Tel 49 9181 906 1750 technik support dehn de ...
Страница 3: ...1000 4 30 class A 10 4 2 Additional measurement capabilities 10 4 3 Device variants 11 4 4 Measurement locations measurement tasks 11 4 5 Measured values recording 12 4 6 Measured values evaluation of power quality PQ 13 4 7 Measurement site concept 14 4 8 Configuration 16 4 9 Events and output channels 17 5 Device description 18 6 Mounting 20 6 1 Mounting as a single device 20 6 2 Mounting with s...
Страница 4: ...tage 28 8 2 Step 2 Connection to the web server 28 8 3 Step 3 Check 28 8 4 Step 4 Configuration 29 9 Functionality 30 9 1 User interface 30 9 2 Block diagram 32 9 3 Measured values 33 9 4 Modbus 34 9 5 Communication via the network 35 10 Device settings 36 10 1 Device settings expert mode 36 10 2 General 36 10 3 LED indicator 36 10 4 Digital inputs digital outputs and logic 37 10 5 Network 41 10 6...
Страница 5: ...rruption 50 11 6 Voltage dip 50 11 7 Voltage swell 50 11 8 Voltage interruption 51 11 9 Unbalance 51 11 10 Total harmonic distortion THD harmonics interharmonics 52 11 11 Mains signalling voltages 52 11 12 Rapid voltage changes 53 11 13 Values for PQ characteristics 54 12 Technical data 57 13 Maintenance 69 13 1 Check 69 13 2 Cleaning 70 13 3 Dismantling 70 13 4 Disposal 70 ...
Страница 6: ...uality DRC SD DEHNrecord SD SPD Surge Protective Device POP Power frequency overvoltage protective device UTC Coordinated Universal Time MSRL Equipment for measurement control and laboratory use according to EN 61010 1 PLC Programmable logic controller ...
Страница 7: ...If the DRC SD is used together with a surge protective device SPD in environments with overvoltage category IV make sure that the SPD is functional before accessing the device If the SPD indicates a defect the SPD must first be repaired before the DRC SD can be accessed The installation instructions for the SPD must be observed for this purpose 2 1 Intended use The DRC SD is permitted for use in t...
Страница 8: ...following can be checked Rotational field direction of the voltage connections Current measuring coil connection Impulse current sensor connection Configuration The DEHNrecord SD can be suitably configured via the Web server Access to the cloud server is preconfigured MQTT port 8883 LED 1 lights up green once access to the DEHNmonitor PQ is working Product registration For product registration in ...
Страница 9: ...us TCP MQTT Page 9 from 69 4 Service description Schematic overview of functions front end DEHN server Measured value acquisition Measured value evaluation Control center PLC PC Current Voltage Push button Digital Impulse current ICS SPD monitoring Web server ...
Страница 10: ...pulse current 8 20 µs and 10 350 µs to 100 kA By maximum duration rise time and single sum charge Current power energy via up to 4 current sensors Rogowski coils or split core current transformers Limit values for current power P Q S current direction zero current and energy global can be parameterized separately for each phase or the neutral conductor Power frequency overvoltages POP According to...
Страница 11: ...upply is uninterruptible 4 4 Measurement locations measurement tasks Energy supplier Power quality monitoring evaluation energy consumption load profile Energy consumer Energy measurement and monitoring Power quality monitoring analysis Installation location Local network stations cable distribution cabinets measuring transducer cabinets transfer points to customer facility main distributions sub ...
Страница 12: ... detailed event data to the cloud This reduces the scope of measured values obtained to the relevant data This can be done from all measurement functions In conjunction with the high re solution temporal detailed data this func tion provides a detailed fault record Events can also be assigned to different output channels LED digital output e mail Events are categorized by basic device functions de...
Страница 13: ...users in the cloud The positions of the devices are generalized Individual parameter set At the same time it is possible to monitor user or site specific issues at the same time The limit values for event detection can be specified individually for this purpose The start of application of an individual parameter set can also be defined immediately or by date This allows a parameter set to be set s...
Страница 14: ...gned to the measurement site again Measurement sites can also be shared with other users organizati ons Registration in the cloud is required Measurement site type A measurement site type defines a specific configuration parame ters limit values output channels that can be assigned to several DRC SD Example The measurement site type IT customer evaluates spe cial parameters that are relevant for d...
Страница 15: ...e A Type A Type A Type B Type B Type C 4 Service description Principle of the measurement site concept Measurement sites of the same measure ment site type behave in the same way and can be parameterized easily and with little effort via the cloud This is a key benefit for managing many devices This concept is available in DEHNmonitor PQ ...
Страница 16: ...lling voltage More detailed explanations of the device settings can be found in chapter 10 4 Modbus TCP Device access via Ethernet interface enables access to parameters limit values current cyclical data status and event data Cloud access The device can be configured via the DEHNmonitor PQ You have access to the current cyclic and past data status event data including detailed histories At presen...
Страница 17: ...ue Example digital input SPD monitoring Example briefly press button 2 Start web server LED 1 device lights up blue Example device update Firmware update successful is reported to the cloud Output channels There are three output channels Ethernet Cloud Modbus TCP LED Digital output The e mail notification is provided via the cloud DEHNmonitor PQ Example connection establishment cloud LED 1 device ...
Страница 18: ...s up green power quality OK in factory setting RGB LED can be assigned to other device functions Push button 1 Option Short 1 s Action 1 start fast data transfer Long 5 s Action 2 device stop start Long 10 s factory reset Push button 2 Basic Short 1 s activate Web server Long 5 s device reset Ethernet Network connection Connection to internal Web server Modbus TCP cloud I O connection Connections ...
Страница 19: ...put 1 max 30 VDC I1 2 6 5 I1 1 Input 2 max 30 VDC I2 2 8 7 I2 1 Input 3 max 30 VDC I3 2 10 9 I3 1 Output 1 potential free contact max 30 V max 500 mA O1 2 12 11 O1 1 Output 2 potential free contact max 30 V max 500 mA O2 2 14 13 O2 1 5 Device description plug Cross sectional area plug push in 0 08 2 5 mm solid wire 0 25 1 5 mm with ferrule A slotted screwdriver size 0 is required to unlock the pus...
Страница 20: ...ing as a single device The device is mounted on a 35 mm DIN rail according to EN 60715 Use in areas with overvoltage category III Backup fuse The backup fuse must be selected to match the connection line e g for 1 5mm2 B16A 300 V CAT III ...
Страница 21: ...EHNrecord SD as well as possible further wiring via its connection terminals may only be carried out by a qualified electrician in accordance with the installation standards of the country Backup fuse The specifications of the respective SPD must be observed Through wiring In the case of further wiring via the terminals of the DRC the backup fuse must be selected accordingly The latching elements ...
Страница 22: ...urement category 300 V CAT III is achieved for the current and voltage measurement inputs of the DEHNrecord SD The safety instructions from chapter 2 must be observed It is recommended to monitor the functionality of the lightning current arresters and surge arresters used e g DEHNventil DEHNvenCi DEHN shield DEHNvap DEHNguard etc See the example monitoring of the FM contact on the following pages...
Страница 23: ...ry IV In the protection area of the SPD green area the measurement category 300 V CAT III required for the DEHNrecord SD is achieved At the same time the DEHNrecord SD monitors the functionality of the SPD via its remote signalling contact Current measurement is optionally possible with split core current sensors DRC SD SCS 100 or Rogowski coils DRC SD RCS 1000 300 V CAT III in the protection area...
Страница 24: ...e signaled via an output channel LED digital output e mail Auxiliary voltage The auxiliary voltage Ue Ue is used to operate the potential free digital inputs Cross sectional area L1 L2 L3 N 1 5 6 mm2 Cross sectional area connector 0 25 1 5 mm2 Example wiring of an SPD with remote signalling contact Connect SPD contact terminal 11 with auxiliary voltage 12 VDC I O connector terminal 3 Feedback from...
Страница 25: ... monitored via an input An event can be signalled via an output channel LED digital output e mail Cross sectional area L1 L2 L3 N 1 5 6 mm2 Cross sectional area connector 0 25 1 5 mm2 Example wiring of an SPD with remote signalling contact Connect SPD contact terminal 11 with power supply 24 VDC I O connector terminal 3 Feedback from SPD contact terminal 12 or 14 to digital input I1 1 I O connecto...
Страница 26: ...ent path to be monitored with two cable ties The arrow shows the positive impulse current direction To avoid influences from neighboring conductors the measurement should only be made on individually laid conductors Mounting may only be carried out on insulated non hazardously active conductors Connection on the device The sensor is connected to the DEHNrecord SD Connection I O brown wire terminal...
Страница 27: ...er frequency load currents can be recorded per device From this power values and energy values are calculated The usage is to be parameterized via the web server and can be configured individually Connection to the device The sensors are connected to the CM connection CM connection current sensors Terminal 1 2 3 4 5 6 7 8 Description IL1 1 IL1 2 IL2 1 IL2 2 IL3 1 IL3 2 IN 1 IN 2 Current sensor L1 ...
Страница 28: ... IP 169 254 0 1 Sub 255 255 255 0 2 Connect computer and DEHNrecord SD directly with network cable 3 Activate web server press push button 2 Basic briefly LED 1 Device lights up blue 4 Access with browser http 169 254 0 10 Password in delivery state smartdevice 8 3 Step 3 Check After successful login the following properties can be checked and settings can be made for example Rotation field direct...
Страница 29: ...figured MQTT port 8883 LED 1 Device lights up permanently green as soon as access to the DEHNmonitor PQ is working Product registration For successful product registration at DEHNmonitor PQ www dehn de powerquality monitor the four digits after the serial number are required in addition to the serial number These are only printed on the DEHNrecord SD itself Example 0000 in FHA12345678 0000 8 Commi...
Страница 30: ...ay with standard configuration LED 1 Device blue Web server active orange Action 1 Factory setting fast data transfer red Action 2 Factory setting device stop start green flashing Power supply ok green Cloud connection ok LED 2 Status green PQ ok orange e g PQ in tolerance red PQ out of tolerance Further signals can be configured The assignment of LED 2 Status to a measuring function is done via t...
Страница 31: ...ese have different functions depending on how long they are pressed Push button Duration function 1 Option short 1 sec Start fast data transfer long 5 sec Device stop start long 10 sec Reset to factory settings 2 Basic short 1 sec Activate web server long 5 sec Device reset Push button 1 Option Push button 2 Basic ...
Страница 32: ...urrent measurement L1 L2 L3 N Voltage measurement L1 L2 L3 N Digital In 1 2 3 Digital Out 1 2 DRC SD 2 2 Power supply extern via connection Ue Ue DRC SD 1 2 Power supply via connection L1 Auxiliary voltage Out via connection Ue Ue 9 2 Block diagram Variant with impulse current measurement expected to be available from Q4 2021 Microcontroller ...
Страница 33: ...easured variables A detailed list with names and descriptions of the individual measured variables can be found in the Modbus manual Power Quality Voltage magnitude Frequency Flicker Voltage unbalance Voltage harmonics Voltage interharmonics Mains signalling voltages Voltage dip swell interruption Rapid voltage changes Power frequency overvoltages Events according to EN 50550 Individual setting e ...
Страница 34: ...dbus instructions It contains a list and description of all Modbus registers and measured variables The file is available on the internet page https www dehn international com en dehnrecord smart device power quality Modbus TCP Operating mode TCP Bus participant role Slave Commands see Modbus instructions 9 Functionality Measured values ...
Страница 35: ...l number 80 HTTP Communication to the web server 123 NTP Time synchronization 502 Modbus Modbus TCP Communication 67 68 DHCP Obtain IP address via DHCP 161 SNMP Registration of the device e g in Windows Explorer to access the web server from there ICMP For ping command External Communication Port Protocol Description Example 443 HTTPS Communication to the target system Azure Cloud 8883 MQTT TLS 9 ...
Страница 36: ...h for the configuration of power quality parameters can be specified here Path for PQ configuration Comment Modbus Limit values can be set via the Modbus Cloud Limit values can be set via the cloud 10 3 LED indicator The display of LED 2 Status can be configured individually The following options are available for this purpose Configuration LED 2 Status green yellow red PQ status standard OK Event...
Страница 37: ...r 10 minute interval Event type Transmission Off No event is transmitted Instant event Only the first event is transmitted immediately Collection event The number of events is transmitted at the end of the 10 minute interval The event trigger defines the kind of signal change to which the inputs react Event trigger Input reacts to signal change On change at rising and falling edge Rising edge with...
Страница 38: ...ior of the respective digital output Parameter Setting options Default value Function Off Contact normally open Contact normally closed Off The active time defines how long the output remains activated after an event occurs in the selected source As soon as another event occurs within this time the time window is restarted Parameter Setting range Default value Active time 100 2000 ms 1000 ms ...
Страница 39: ...quency overvoltages POP PQ standard Violation of a PQ limit according to EN 50160 PQ individual Violation of a PQ limit according to individual set of limit values Impulse Violation of an impulse limit Energy current Events caused by the current and energy measurement see chapter 10 6 current measurement Device Events generated by the DEHNrecord SD itself such as cloud connection established or ac...
Страница 40: ...ource LOGIC function IN 0 IN 1 IN 3 internal event OUT 0 OUT 1 UN in V b a To link output 1 or 2 with the logic select Logic as the source under the setting for the respective output Parameter Values Function OFF AND OR XOR NOR NAND XNOR Input 1 2 and 3 digital inputs off normal inverted Input 4 internal source off POP PQ standard PQ individual impulse energy current device Variant with impulse cu...
Страница 41: ...e DNS server for static settings 0 0 0 0 255 255 255 255 8 8 8 8 DNS Server 2 IP of the DNS server for static settings 1 1 1 1 Static IP if DHCP is disabled 169 254 0 10 Static IP gateway if DHCP is disabled 0 0 0 0 Static IP netmask if DHCP is disabled 255 255 0 0 Time server 1 SNTP de pool ntp org Time server 2 SNTP ptbtime1 ptb de Time server 3 SNTP ptbtime2 ptb de Time server 4 SNTP ptbtime3 p...
Страница 42: ...s only accessible in web server expert mode MQTT server Adress dkg sdc prod iothub devices 01 azure devices net MQTT username dkg sdc prod iothub devices 01 azure devices net FHAxxxxxxxx api version 2019 10 01 FHAxxxxxxxx serial number of the device ...
Страница 43: ...ectivity factor This factor can be used to determine the time at which the digital out put is switched if POP is set as the source for it By default this is set to 1 which corresponds to half of the voltage time window minus the switch off time reserve Switch off time reserve This time serves as the reserve which a potential protective device requires from recording a trigger signal to switch off ...
Страница 44: ...eshold 2 440V Attention Exceeding or falling below threshold must be set under Status Direction Status Direction Setting whether triggering occurs when the voltage threshold is exceeded or not reached Duration Delay time after which triggering occurs when the voltage threshold is exceeded or not reached Individual recording criterion Setting range Devault value Voltage 2 440 V 325 V Duration 0 04 ...
Страница 45: ...equency The further mean values are calculated from this 3 s 5 min Measuring intervals For data provided in the cloud or via Modbus a measuring interval of 5 minutes is defined This measuring interval also corresponds to the averaging time over which the average value is calculated for each measured variable Fast data transfer During fast data transfer the 3 second average values 10 s for frequenc...
Страница 46: ... over 3 phases 0 9999999 kWh If an event is recognized i e the recorded measured value exceeds or falls below the associated limit or fulfills the underlying condition this event is provided with the corresponding data event type and category time stamp parameters measured value and included in the transfer to the cloud for archiving and evaluation It is also available for retrieval in the corresp...
Страница 47: ...Frequency of the mains signalling voltage Frequency of the ripple control signal the 3 second mean value of which is compared with the limit Duration Period over which compliance with the limit is monitored Trigger threshold If this is exceeded the duration of the monitoring starts Specified as a deviation in of the nominal voltage You will find the setting range and devault values in the chapter ...
Страница 48: ...00 4 30 Flagged data indicate that they may be unreliable The user is free to take them into account or not Periods For various power quality characteristics time periods can be defined within an observation period in which the limits must be observed This period is specified in of the selected observation period and indirectly defines the permissible number of events within an observation period ...
Страница 49: ...vation period and the minimum and maximum in deviation from the nominal value 11 4 Flicker Flicker is visually perceptible change in luminosity of light sources A distinction is made between short term flicker Pst 10 minute value and long term flicker Plt 2 hour value Limits Limits can be defined for flicker short and long term In addition a period can be defined in which the limits must be observ...
Страница 50: ...is can also be configured individually Voltage dips are categorized according to table 2 of EN 50160 and the number of dips permitted before it is categorized as a violation can be defined for each individual category In addition there is a field for categories that are not defined in the table 11 7 Voltage swell If the voltage exceeds a defined threshold a voltage swell is detected Limits In addi...
Страница 51: ...orized as either short or long interruption It is also possible to define a permitted number of interruptions per category before it is categorized as a violation 11 9 Unbalance The unbalance of a three phase system is represented by the quantity u2 using the symmetrical components This represents the ratio of the negative sequence component to the positive sequence component in percent Limits In ...
Страница 52: ...imits must be observed before a violation occurs The maximum is given as a value to the rms value of the fundamental 50 Hz In addition the highest order up to which the individual harmonics are included in the calculation of the THD can be defined 11 11 Mains signalling voltages Power supply companies often use their network for communication purposes Mains signalling voltages so called ripple con...
Страница 53: ...oltage magnitude is at a nearly constant level for a period of time and suddenly a voltage change occurs that significantly deviates from that level Limits The voltage change level defines the limit from which height the deviation from the constant level is considered as a rapid voltage change This limit is given in of the nominal voltage In addition a hysteresis can be defined for this value and ...
Страница 54: ...50160 Voltage magnitude Period 1 0 100 95 Max 1 0 1 25 10 Min 1 25 0 1 10 Period 2 0 100 100 Max 2 0 1 25 10 Min 2 25 0 1 15 Frequency Period 1 0 100 99 5 Max 1 0 1 25 1 Min 1 25 0 1 1 Period 2 0 100 100 Max 2 0 1 25 4 Min 2 25 0 1 6 Flicker long term Period 0 100 95 Max 0 2 10 1 0 Flicker short term Period 0 100 Max 0 2 10 ...
Страница 55: ...tage swell Number 0 1000 Threshold 50 1 10 Hysteresis 0 10 2 Voltage interruption Number 0 1000 Threshold 1 10 5 Hysteresis 0 10 2 Duration short term long term 1 600 s 180 s Unbalance Period 0 100 95 max 0 5 5 2 0 THD Period 0 100 100 max 0 1 20 8 Order h Up to this order the individual harmonics are taken into account for the calculation of the THD 0 50 40 ...
Страница 56: ...ine under device settings 100 3000 Hz 175 Hz Recording duration to define under device settings 3 120 s 120 s Trigger threshold to define under device settings 0 3 4 9 4 5 Rapid voltage changes Number 0 1000 Level 1 6 5 Hysteresis 0 5 3 2 5 min threshold bei Voltage dip 50 1 10 max threshold bei Voltage swell 1 50 10 Table H Limits for individiual harmonics Order h 2 3 4 5 6 7 8 9 10 11 12 13 14 1...
Страница 57: ...mption 30 mA max 100 mA max Power consumption 8 W max 3 W max Max permissible input voltage in the event of a fault with disconnected neutral 400 VAC Supply voltage buffering in case of power failure min 5 seconds depending on power supply Supply voltage buffering in case of voltage dip up to 70 min 60 seconds depending on power supply Permitted overvoltage 463 VAC for 5 seconds 12 Technical data ...
Страница 58: ... connecting cable e g for 1 5mm2 B16A Backup fuse in combination with an SPD The specifications of the respective SPD must be observed Analog inputs Impulse current measurement 1 x Impulse current sensor DRC SD ICS for recording of surge currents up to 100 kA Voltage measurement 3 x Recording the AC mains voltage of all three phases Current measurement 4 x Rogowski coils or split core current tran...
Страница 59: ...gital signal via a potential free contact max 24 VDC max 0 5 A max 0 25 W User interface Push buttons 2 x Control during operation LEDs 2 x RGB Display of different states Standards Safety MSRL EN 61010 1 2010 Cor 2011 EN 61010 2 030 2010 Cor 2011 EMC MSRL industry power plants EN 61326 1 2013 EN 61000 6 5 2015 AC 2018 Power quality devices features EN 62586 1 2017 EN 61000 4 30 2015 EN 50160 2010...
Страница 60: ... Housing impact resistance IK 06 Installation location control cabinet Mounting type DIN rail in main or sub distribution operation with panel cover Connection supply mains voltage measurement Busbar 2 pol 4 pol solid wire 2 pol 4 pol Protection class IP20 Possible combinations With SPD product family directly with busbar DEHNventil DEHNshield DEHNguard DEHNbloc modular With SPD product family fre...
Страница 61: ...ge storage and transport from 5 to 95 Indoor operation from 5 to 95 Note no condensation no ice Contamination by dust salt smoke corrosive flammable gas vapors no significant pollution Vibrations seismic shocks IEC 60721 3 1 IEC 60721 3 2 IEC 60721 3 3 Electromagnetic immunity DIN EN 61000 6 5 2016 07 Operating height max 2000 m above sea level Pollution level 2 Overvoltage category related to the...
Страница 62: ...modules MVS 4 8 11 910 814 Busbar for use with DEHNventil DEHNbloc modular 8 DIN modules MVS 4 56 910 614 Parallel connection busbar and line possible Input voltage Lx N 230 Veff 50 Hz max 300 Veff Input rated voltage measurement category 300 V CAT III Input rated voltage measurement category together with SPD Up 2 5 kV 300 V CAT IV Detection of power frequency overvoltages Limits according to EN ...
Страница 63: ... for designated external split core current transformers or Rogowski coils Number 4 Connection cross section 0 08 2 5 mm solid wire 0 25 1 5 mm with ferrule Parameterization via web server cloud or Modbus Isolation current measurement input no galvanic isolation ...
Страница 64: ...h 2 cable ties Weight 120 g Safety insulation touchability of sensors 300 V CAT III Safety insulation to the live conductor 300 V CAT III Current sensors Rogowski coil divisible flexible DRC SD RCS 1000 Part No 910 937 Measuring range 0 1000 A 2000 A max 50 Hz Bandwidth 50 kHz Ring diameter inside 150 mm Dimension Ø 10 mm Connection cable length 3 m alternative 1 m Weight 250 g Safety insulation t...
Страница 65: ...rrule Connection type push in Measuring range 0 100 kA Voltage magnitude resolution 100 A Sampling rate 1 µs Waveform 8 20 10 350 µs Recording length max 500 ms Impulse values calculated Ipeak Qges Tr Tw category duration Trigger threshold voltage level parameterizable via internal web server or via the cloud Variant with impulse current measurement expected to be available from Q4 2021 ...
Страница 66: ...onductor to be measured with 2 cable ties included Dimensions W x D x H 23 x 30 x 75 mm Connecting cable length 3 m incl fastening and kink protection Weight 25 g Safety insulation touchability of sensors 300 V CAT III Variant with impulse current measurement expected to be available from Q4 2021 Mounting may only be carried out on insulated non hazardously active conductors ...
Страница 67: ...I Isolation connections to other digital outputs galvanically isolated Isolation connections to external DC supply 100 V Digital inputs 3 x Type multifunctional Voltage nominal voltage 24 VDC max 30 VDC high 8 5 V low 7 35 V Current consumption max 10 mA Polarity arbitrary Isolation connections to voltage measurement inputs 300 V CAT III Isolation connections to other digital outputs galvanically ...
Страница 68: ...Measurement power quality Measuring range Measurement accuracy method Voltage magnitude 10 150 of UN 0 1 of UN Frequency 15 of fN 10 mHz Flicker 0 2 10 Pst EN 61000 4 15 Dip swell 10 150 of UN 0 2 of UN 1 period Interruption 10 of UN Unbalance 0 5 5 of u2 andu0 0 15 Harmonics Interharmonics Order 2 50 EN 61000 4 7 class I Mains signalling voltage 0 15 von UN EN 61000 4 30 Rapid voltage changes 1 o...
Страница 69: ...tenance of the device is recommended 13 1 Check A test could be carried out for example by a parallel measurement with a reference device Reasons for premature maintenance may include The device was exposed to temperatures outside the tolerance range for a long time Frequent and extraordinary EMC phenomena Please note The reason for a permanent deterioration of the measurement results may be solel...
Страница 70: ...a cloth dampened with water No liquids may penetrate the device 13 3 Dismantling ATTENTION Risk of electric shock A DEHNrecord SmartDevice may only be dismantled by a qualified electrician 13 4 Disposal The device must not be disposed of with household waste Further information can be found on our homepage www dehn de 13 Maintenance ...
