Alarm, memory and safety functions
Contents
1. Any contractors normally open or closed In spite of all efforts to produce appliances of unequalled reliability Liebherr strongly recommends that the volt free contact is wired into some kind of indepen dent and external warning system Please take a few moments to consider the value of the contents of the refrigerators and freezers under your supervision The cost of such a warning system is often negligible in comparison to the value of the contents 19 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller Interface for optional NTC product temperature probe All LK U v LCv LK U exv LG U ex and LGT models have an integrated interface for connecting an optional available NTC product temperature probe to the comfort controller The controller can be set to display either the internal air temperature as registered by the air probe or the temperature registered by the product probe Depending on this selection the temperature alarm limits are related either to the air probe or to the product probe In addition the product temperature can be monitored on an externaldocumentation system via the RS 485 interface Whereas the air probe is in a fixed position the product probe will be located by the user e g in a phial or in a measurement package in order to simulate a product temperature The product temperature probe is water resistant and resistant to corrosion IP 68 and AISI 3162. s 4 4 Pee ve i _ __ KL eee SS ww SL _ _ _ ee ee f it Laboratory technical sales manual j j f y t LIEBHERR Pt ey 2S w P gt Se _ hey ee Contents LKPv and LGPv laboratory appliances with Profi Controller m s MR 1 arta Alarm memory and safety functions Temperature door open and power failure alarms Internal system alarms Internal memory functions special safety functions Temperature and alarm documentation External temperature and alarm monitoring connections External alarm contact connection Product temperature monitoring connection Safety feature table Temperature consistency and distribution according to NF X 15 14 Description of the NF X 15 140 test procedure Results according to NF X 15 140 LK U v LCv LK U exv LG Uj ex and LGT laboratory appliances with Comfort Controller Alarm memory and safety functions Temperature door open and power failure alarms Internal system alarm Internal memory functions special safety function Temperature and alarm documentation W External temperature and alarm monitoring connection External alarm contact connection ay Product temperature monitoring connection i Safety feature table Temperature consistency and distribution according to NF X 15 140 Ne Description of the NF X 15
3. Min Max temperature memory Yes Yes Yes Yes Yes Yes Yes Yes Yes No For refrigerator 2 C safety thermostat Yes Yes Yes No Yes Yes Yes compartement Access port for e g PT 100 probe Yes Yes Yes Yes Yes Yes Yes Yes Yes Probe failure alarm Yes Yes Yes Yes Yes Yes Yes Yes Yes Low temperature freezers to 45 C LGT 2325 LGT 3725 LGT 4725 spark free interior No No No High Low temperature alarm Yes Yes Yes audio and visual Lid open alarm Yes Yes Yes audio and visual Power failure warning after power Yes Yes Yes supply is returned visual Volt free contact for external alarm signal RS 485 data transfer fur Datentransfer RS 485 RS 232 converter with data monitoring software Yes Yes Yes Yes Yes Yes Accessory Accessory Accessory NTC product temperature probe Accessory Accessory Accessory Internal alarm memory Min Max temperature memory Access port for e g PT 100 probe Probe failure alarm Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 21 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller Temperature consistency and distribution according to NF X 15 140 The Liebherr laboratory cabinets are all tested in house to the NF X 15 140 test procedure Liebherr s modern R amp D facility has climate controlled test rooms which conform to EN 23953 Description of the NF X 15 140 test procedure The general test
4. Average probe temperature Set temperature LGUex 1500 OEC 1750C max BaT Un mean value warmest probe expanded measurement uncertainty 18 0 C Pr en EE 20C 23 0 C 23 016 24 0 C ti 2 t3 t4 t5 t6 w t8 t9 Probes e Average probe temperature Set temperature Pres Gradient HO 4 1 K 1 6K 2 5K from set temperature Max fluctuation 3 0 K Gradient HO 5 7K 2 1K 3 6 K from set temperature Max fluctuation 0 80 K 26 LK U v LCv LK Ujexv LG U ex and LGT laboratory appliances with Comfort Controller LKv 3910 r ITT 9 0 C l o o A F HOA IOE i 45 C S 4 0 C Shona 6026 25 N 20C z 1 5 C ORC Gradient H8 3 0K 1 25K 1 75K from t1 t2 13 t4 t5 t6 t7 t8 t9 set temperature Probes Max fluctuation 2 5 K e Average probe temperature Set temperature LKv 3912 es Ts a Colt i L0G oo 1G 6 0 C Sone 50 C 45 C 40 C oes SOG Mess G Gradient HO 4 2 K 1 8 K 2 4 K from Probes 2075 Max fluctuation 3 7 K e Average probe temperature Set temperature AA LK U v LCv LK Ujexv LG U ex and LGT laboratory appliances with Comfort Controller LKexv 3910 8 0 C LoC OS max 0 Un mean value warmest probe expanded measurement uncertainty Bo 6 0 C Dor DOC 4 5 C 4 0 C 30 F oe 2306 Gradient HO 2 8 K
5. relative humidity Refrigerator set temperature 5 C Freezer set temperature 20 C Measurements are made using 9 x PT 100 air temperature probes positioned in accordance with NF X 15 140 Unless specifically stipulated the temperature probes are located at equal distances from the walls of 1 10 of each of the dimensions of the internal volume w h d The location of the probes used for characterization forms a supposedly representative sample of the working space The characterization is performed using nine probes one located at each corner one in the centre of the working space Location of the probes used for characterization WA 7 1 10 B 1 10 H N amp 5 centred 10 LKPv and LGPv laboratory appliances with Profi Controller Cabinets are tested empty over a period of 24 hrs including defrost cycles Test criteria for characterising the temperature consistency and distribution 1 Gradient or homogeneity The gradient H8 is the maximum difference obtained in an achieved environment between the mean values of measurements oh increased by their expanded uncertainty Uy within the working space during the measurement time Gradient Distribution of temperatures within the chamber H max 6 U_ min BU n max mean value warmest probe expanded measurement uncertainty min mean value coldest probe expanded measurement uncerta
6. the PC on which the software is running if this PC is not supervised e g at night or over weekends then the alarm signal might not be recognised In order to avoid unrecognised alarms the software includes an email function which sends an email in case of an alarm condition to predefined email addresses These emails can be easiliy checked with a smartphone Therefore the user will be warned without having direct access to a computer Networking Both laboratory appliances with Profi Controller as well as laboratory appliances with Comfort Controller can be networked using the same Liebherr accessory package RS 485 interface converter including temperature monitoring software Example RS 485 network Ro 0 485 Optimum shielded Twisted Pair fe a o o Terminator ocol ecol 120 Ohm 7 5 7 9 Address 1 Address 2 ol BUS line appliance 1 appliance 2 appliance 20 Terminator 120 Ohm S Address 3 18 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller External alarm contact connection Volt free contact All LK U v LCv LK U exv LG U ex and LGT models have an integrated volt free contact The relay contact can be wired into a warning system in the building which would advise e g security personnel or a janitor outside of working hours Warning systems with audio or visual alarms are possible The followi
7. 1 2K 1 6K from t1 t2 13 t4 t5 t6 1 t8 t9 set temperature Probes 2 0 C Max fluctuation 3 4 K e Average probe temperature Set temperature LGex 3410 WOC IOC AORC AGC OR AIC 20 0 C 203C LONG SN e L 22 0EC Ni Gradient HO 2 9K 1 4K 1 5 K from Probes set temperature ZE Max fluctuation 0 40 K e Average probe temperature Set temperature 28 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller LCv 4010 Evaluation of refrigerator compartment 8 0 C Gan max Wa mean value warmest probe expanded measurement uncertainty OS Bo 6 0 C 50 1G 0 0 C 49 C 4 0 C 30C aU 23 6 20 t t2 t3 t4 5 t6 t7 t8 t9 Probes e Average probe temperature Set temperature LCv 4010 Evaluation of freezer compartment IOI G 17 0 C max Oar Un mean value warmest probe expanded measurement uncertainty T60 AEC HOE 193C 2000C LOC OC L 2206 2297C 20C LC 24 0 C ti t2 3 t4 5 t6 t7 t8 t9 Probes e Average probe temperature Set temperature M Shi Hi HI Gradient HO 3 4K 1 8K 1 6K from set temperature Max fluctuation 4 0 K Gradient HO 6 0K 2 6K 3 4 K from set temperature Max fluctuation 3 4K 23 LK U v LCv LK Ujexv LG U ex and LGT laboratory appliances with Comfort Controller LGT 2325 41 0 C 41 5 C max CF Un mean value warmest pr
8. 140 test procedure Results according to NF X 15 140 LKPv and LGPv laboratory appliances with Profi Controller Alarm memory and safety functions Liebherr Mediline refrigerators and freezers with Profi Controller help to protect your inventory These cabinets offer a variety of alarm memory and safety features designed to greatly reduce the risk of loss of contents Temperature door open and power failure alarms High and low temperature alarms All LKPv and LGPv modells have integrated high and low internal air temperature alarms with both audio and visual signals The factory settings for the alarm limits are 3 2K in relation to the set temperature lf the set temperature is altered to meet a specific storage temperature requirement then the alarm settings move in parallel and do not need to be adjusted separately There is a 30 minute delay to avoid unwanted alarms due to e g door opening Door open alarm All LKPv and LGPv modells register when doors are left open or ajar and have an integrated audio and visual door open alarm This alarm has a 1 minute delay which can be adjusted Power failure alarm All LKPv and LGPv modells have a battery back up which operates an audio and visual alarm immediately upon power failure Both the integrated temperature data logger and the optional external temperature monitoring via the RS 485 interface continue to function during power failure for up to 72 hrs Internal system alarms The fo
9. 2 EG max 8 oe U mi mean value warmest probe expanded measurement uncertainty 65C 6 0 C Doe 9 0 C 45 C 4 0 C min eae U mean value coldest probe expanded measurement uncertainty IIC G 3 0 C oe AOE Gradient HO 2 6K 1 5K 1 1K from Probes Max fluctuation 1 6 K e Average probe temperature Set temperature 14 LKPv and LGPv laboratory appliances with Profi Controller LGPv 6520 SC max 8 Un mean value warmest probe expanded measurement uncertainty 18 0 C Pike AG H Gradient SHO a 200 C 2057C 2107C AoC 2206 228 ORC t 2 t3 t4 t5 t6 t7 t8 t9 Max fluctuation 3 6 K e Average probe temperature Set temperature LGPv 1420 ORC IOC AORC AGC OR AIC 20 0 C 203C LOG SNe S2ZA0 AG Zo t1 t2 13 t4 t5 t6 t7 t8 t9 Gradient HO 3 5K 1 5K 2 0 K from Probes set temperature e Average probe temperature Set temperature Max fluctuation 3 9 K The evaluation of the LKPv 8420 and LGPv 8420 models will be available in December 2011 Gradient HO 3 0K 1 75K 1 25K from Probes set temperature l3 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller Alarm memory and safety functions Liebherr Mediline refrigerators and freezers with Comfort Controller help to protect your inventory These cabinets offer a variety of alarm memory and safety features designed to greatly
10. BU n max mean value warmest probe expanded measurement uncertainty min mean value coldest probe expanded measurement uncertainty Example Gradient Homogeneity Cin E Oma FUM Om UM 3 6m Um Maximum value JF e Om ce aie fen sensor Nr 3 p a ee fares ee Ome see a e Um ee ae aay ak aivee mee cet el ae Sensor Nr 2 B Minimum value Measurement period tin min The gradient indicates the temperature distribution within the cabinets Especially in the laboratory sector optimum temperature distribution is crucial to guarantee the safe storage of samples or other products at any place within the unit The lower the gradient the better is the temperature distribution within the unit gt LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller 2 Fluctuation The characterisation of the temperature fluctuation within the working space enables to determine the variation in maximum temperature at a measurement point of the working space during the measurement time Maximum fluctuation Value of the probe with the greatest difference between highest and lowest measured temperature The lower the maximum fluctuation the better is the temperature consistency within the units Example Fluctuation Caled gt D o E Maximum F fluctuation D Sem amp 2 _ E a D 2 eee
11. It complies with NSF standards Due to possible tolerances of the product temperature probe the temperature displayed can differ from the product probe temperature Using the calibration function the temperature displayed can be aligned with the product probe temperature The correction value for the compensation of the differences can be adjusted in 0 1 C steps ae eeeae if Cal 05 C 20 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller Safety feature table Laboratory appliances with Comfort Controller LCv 4010 LKUv 1610 LKUv 1612 LKUexv1610 LGUex 1500 LKv 3910 LKv 3912 LKexv 3910 LGex 3410 Spark free interior No No Yes Yes No No Yes Yes No High Low temperature alarm au Yes Yes Yes Yes Yes Yes Yes Yes Yes dio and visual Door open alarm audio and visual Yes Yes Yes Yes Yes Yes Yes Yes Yes Power failure warning after power supply is returned visual Yes Yes Yes Yes Yes Yes Yes Yes Yes Volt free contact for external alarm Yes Yes Yes Yes Yes Yes Yes Yes Yes signal RS 485 data transfer interface Yes Yes Yes Yes Yes Yes Yes Yes Yes RS 485 RS 232 converter with aS Accessor data monitoring software y Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory NTC product temperature probe Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory Internal alarm memory Yes Yes Yes Yes Yes Yes Yes Yes Yes
12. ae OSS VS 3 Fluctuation of a sensor B Soj Mem t ee A B B B Duration of measurements tin min 24 LK U v Lv LK Ujexv LG Ujex and LGT laboratory appliances with Comfort Controller Resulis according to NF X 15 140 The evaluation of air temperatures of the LK U v LCv LK U exv LG U ex and LGPv models according to NF X 15 140 using a PT 100 temperature probe with 25 g copper leads to the following results LKUv 1610 8 0 C LIE 7 0 C max eae Un mean value warmest probe expanded measurement uncertainty CoC 6 0 C oe SOG 49 C 4 0 C 39C SONS 296 Gradient HO 2 9K 1 3K 1 6K from t1 t2 US t4 t5 t6 t7 t8 t9 set temperature Probes 2 0 C e Average probe temperature Set temperature Max fluctuation 2 9 K LKUv 1612 8 0 C Gare max 0 Un mean value warmest probe expanded measurement uncertainty 7 0 C Gia 6 0 C 55 9 0 C 45 C 40 C Sone OG 71S AG Gradient HO 4 0K 2 0K 2 0 K from t1 t2 t3 t4 t5 t6 i t8 t9 set temperature Probes 20 e Average probe temperature Set temperature Max fluctuation 3 3 K 23 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller LKUexv 1610 8 0 C oa max Wa mean value warmest probe expanded measurement uncertainty OaE H Gradient a S ae ee a Ot t ee DOR 4 5 C 4 0 C 30L 30C 296 2 0 C tl t2 t3 t4 t5 t6 t t8 t9 Probes e
13. arm audio and visual Yes Yes Yes Yes Yes Yes Yes Yes Door open alarm audio and visual Yes Yes Yes Yes Yes Yes Yes Yes RE Ne TA battery backup Yes Yes Yes Yes Yes Yes Yes Yes Volt free contact for external alarm signal Yes Yes Yes Yes Yes Yes Yes Yes RS 485 data transfer interface Yes Nes Yes Yes Yes Nes ves Yes Infrared data transfer interface Yes Nes Yes Yes Yes Ves Yes Yes Urea transfer key with data monitoring Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory iar See nverter with data Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory NTC product temperature probe Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory Internal alarm memory Yes Yes Yes Yes Yes Yes Yes Yes Min Max temperature memory Yes Yes Yes Yes Yes Yes Yes Yes Access port for e g PT 100 probe Yes Yes Yes Yes Yes Yes Yes Yes Probe failure alarm Yes Yes Yes Yes Nes Yes Yes Yes Condenser and evaporator temperature alarms Yes Yes Yes Yes Yes Yes Yes Yes LKPv and LGPv laboratory appliances with Profi Controller Temperature consistency and distribution according to NF X 15 140 The Liebherr laboratory cabinets are all tested in house to the NF X 15 140 test procedure Liebherr s modern R amp D facility has climate controlled test rooms which conform to EN 23953 Description of the NF X 15 140 test procedure The general test conditions are as follows Ambient temperature 25 C 60
14. conditions are as follows Ambient temperature 25 C 60 relative humidity Refrigerator set temperature 5 C Freezer set temperature 20 C Low temperature freezer set temperature 45 C Measurements are made using 9 x PT 100 air temperature probes positioned in accordance with NF X 15 140 Unless specifically stipulated the temperature probes are located at equal distances from the walls of 1 10 of each of the dimensions of the internal volume w h d The location of the probes used for characterization forms a supposedly representative sample of the working space The characterization is performed using nine probes one located at each corner one in the centre of the working space Location of the probes used for characterization 1 104 WA VA 1 10 B 2 3 5 centred 7 8 ae LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller Cabinets are tested empty over a period of 24 hrs including defrost cycles Test criteria for characterising the temperature consistency and distribution 1 Gradient or homogeneity The gradient H8 is the maximum difference obtained in an achieved environment between the mean values of measurements oh increased by their expanded uncertainty Uy within the working space during the measurement time Gradient Distribution of temperatures within the chamber H max 6 U_ min
15. ditions to greatly reduce the risk of loss of contents External temperature and alarm monitoring connections Infrared interface and optional infrared key All LKPv and LGPv models have an integrated temperature data logger which stores up to 2800 air probe temperature values recorded at 4 minute intervals which equals approximately 7 7 days In order to use this data an infrared device key is available as an optional extra The data is transferred from the infra red interface on the cabinet to the infrared key This key is then connected by cable to a PC or laptop and the data is transferred onto the dedicated software on the PC Only one set of data i e from one cab inet can be transferred at one time LEBHERR The optional kit includes all the necessary components key cable and software including manual The soft ware allows visualisation and analysis of the temperature data in various formats including a graph The data can also be exported to Excel Word and other standard formats for storage or further analysis Example visualisation of temperature data Internal temperature 16 07 2009 16 07 2009 17 07 2009 17 07 2009 17 07 2009 17 07 2009 18 07 2009 18 07 2009 18 07 2009 18 07 2009 19 07 2009 19 07 2009 19 07 2009 19 07 2009 ii 18 00 00 00 06 00 00 18 00 12 00 18 00 12 18 00 00 00 06 00 00 00 06 00 2 00 LKPv and LGPv laboratory appliances wi
16. fective probes are registered and the controller cause an audio and visual alarm signal In case of an air probe error the controller has pre defined operating modes to maintain the internal temperature at 5 C 16 LK U v LCv LK U exv LG U ex and LGT laboratory appliances with Comfort Controller Internal memory functions Internal alarm memory This function stores to memory details of the last three temperature and power failure alarms Time and date of the start and the duration of the alarm conditions are registered Min max temperature memory After reaching the set temperature for the first time the Comfort controller begins continuously to store to memory the highest and lowest internal temperatures registered These minimum and maximum temperatures can be read out from the memory After reading the min max memory the values can either be reset or left in the memory Normally the values would be noted by the user and the memory reset in order to define the next period to be registered The controller also registers the time elapsed since the last reset up to a period of 40 days Special safety function Electro mechanical 2 C safety thermostat for laboratory refrigerators with Comfort Controller In order to ensure maximum reliability the Comfort Controller has a heavy duty compressor relay thus reducing the possibility of burned relay contacts Should however a defect occur an additional safety ther mostat backs
17. inty Example Gradient Homogeneity en oC Maximum value Om Um V 8m a5 Um 3 s a ir o i e D sensor Nr 3 T amp 2n as aant 6m ne 8m D Um 2 l n s e T sensor Nr 2 B Minimum value Measurement period tin min The gradient indicates the temperature distribution within the cabinets Especially in the laboratory sector optimum temperature distribution is crucial to guarantee the safe storage of samples or other products at any place within the unit The lower the gradient the better is the temperature distribution within the unit 11 LKPv and LGPv laboratory appliances with Profi Controller 2 Fluctuation The characterisation of the temperature fluctuation within the working space enables to determine the variation in maximum temperature at a measurement point of the working space during the measurement time Maximum fluctuation Value of the probe with the greatest difference between highest and lowest measured temperature The lower the maximum fluctuation the better is the temperature consistency within the units Example Fluctuation Caled gt D o E Maximum F fluctuation D Sem amp 2 _ E a D 2 eee ae OSS VS 3 Fluctuation of a sensor B Soj Mem t ee A B B B Duration of meas
18. llowing alarms are related to internal self checks of the refrigeration system and the electronic controller probes While these might not be immediately relevant to the everyday operation of the cabinets they do provide added security by warning probably before the air temperature probe registers an alarm condition They also provide a service engineer with valuable information thus allowing quicker intervention High condenser temperature alarm This integrated audio and visual alarm warns of excessive condenser temperatures possibly caused by e g high ambient temperatures or blocked air flow to or from the refrigeration system Low evaporator temperature alarm This integrated audio and visual alarm warns of low evaporator temperatures possibly caused by e g defective air circulation fan or blocked internal air flow This alarm will possibly warn much sooner than the high or low temperature alarm Probe failure alarm As a self control system defective probes are registered and the controller cause an audio and visual alarm signal In case of an air probe error the controller has pre defined operating modes to maintain the internal temperature at 5 C LKPv and LGPv laboratory appliances with Profi Controller Internal memory functions Internal alarm memory This function stores to memory details of the last 30 alarms time and date of the start and the end of the alarm condition the type of the alarm condition and the maximum and minim
19. ng example shows a circuit with a visual alarm Either normal operation or alarm condition or both can be indicated Either AC or DC circuits are possible max AC 230 V 5 Amp Example visual alarm system using volt free alarm contact Normal operation Alarm condition e g green lamp e g red lamp indicating normal indicating alarm opretaion condition external power supply external power supply Alternatively if no internal warning system is in place and additional wiring inside the building is problematical the volt free contact can be used in conjunction with e g a GSM alarm dialler There are many different versions of GSM alarm dialers available on the market which either call a telephone number and or send a text message in case of an alarm Depending on the specification of GSM alarm dialers potentially many appliances can be connected to one dialler Being GSM appliances only a SIM card and a power supply are required The following example shows a circuit with a GSM dialler A change in relay setting activates the alarm function of the dialler and thus initiates either a telephone call or an SMS to pre defined numbers with a pre recorded message The dialler in the example has 6 addressed alarm inputs This could be 6 individual appli ances or 6 rooms each with several appliances wired in series Example GSM dialer alarm system using volt free alarm contact Alarm inputs A1 6 Open or close Ai 6 to GND Normal operation
20. ntroller as well as laboratory appliances with Comfort Controller can be networked using the same Liebherr accessory package RS 485 interface converter including temperature monitoring software Example RS 485 network Optimum Terminator Shielded Twisted Pair 120 Ohm e IE J Terminator OOo 120 Ohm on ae gt 8 Address 1 Address 2 Adaress 3 LKPv and LGPv laboratory appliances with Profi Controller External alarm contact connection Volt free contact All LKPv and LGPv models have an integrated volt free contact The relay contact can be wired into a warning system in the building which would advise e g Security personnel or a janitor outside of working hours Warning systems with audio or visual alarms are possible The following example shows a circuit with a visual alarm Either normal operation or alarm condition or both can be indicated Either AC or DC circuits are possible max AC 230 V 5 Amp Example visual alarm system using volt free alarm contact Alarm condition e g green lamp e g red lamp indicating normal i indicating alarm opretaion condition external power supply 4 external power supply Alternatively if no internal warning system is in place and additional wiring inside the building is problematical the volt free contact can be used in conjunction with e g a GSM alarm dialler There are many different versions of GSM alarm dialers available on the market which either call a tele
21. obe expanded measurement uncertainty 42 0 C 7 3 H Gradient 42 5 C 43 0 C 43 9 C 44 0 C 445 C 45 0 C 45 5 C 46 0 C 46 5 C 47 0 C 47 5 C Gradient HO 4 58 K 2 45 K 2 13K from t1 t2 t3 t4 t5 t6 v t8 t9 set temperature Messkanal 48 0 C Max fluctuation 1 8 K e Average probe temperature Set temperature If the cabinet is operated at 20 C it is recommended to reduce the predefined offset of 2 7 K to 1 0 K See user manual LGT 3725 42 5 at max 8 a W mean value warmest probe expanded measurement uncertainty 43 0 C 43 5 C 44 0 C 44 5 C 45 0 C 45 5 C 46 0 C 46 5 C 47 0 C 475 C Gradient HO 3 23 K 0 82 K 2 41 K from t1 e 3 t4 E t6 t7 t8 t9 set temperature Probes 48 0 C Max fluctuation 0 5 K e Average probe temperature Set temperature lf the cabinet is operated at 20 C it is recommended to reduce the predefined offset of 2 7 K to 1 0 K See user manual 30 LK U v Lv LK Ujexv LG Ujex and LGT laboratory appliances with Comfort Controller LGT 4725 42 5 C max 8 Wa mean value warmest probe expanded measurement uncertainty 43 0 C SUS aU 44 0 C 44 5 C 45 0 C 45 5 C 46 0 C 46 5 C 47 0 C 47 9 C Gradient HO 3 27 K 0 8K 2 47 K from ti t2 IIs t4 t5 t6 t7 t8 t9 set temperature Probes 48 0 C Max fluctuation 1 1 K e Average probe temperat
22. phone number and or send a text message in case of an alarm Depending on the specification of the alarm dialler potentially many appliances can be connected to one dialler Being GSM appliances only a SIM card and a power supply are required The following example shows a circuit with a GSM dialler A change in relay setting activates the alarm function of the dialler and thus initiates either a telephone call or an SMS to pre defined numbers with a pre recorded message The dialler in the example has 6 addressed alarm inputs This could be 6 individual appliances or 6 rooms each with several appliances wired in series Example GSM dialler alarm system using volt free alarm contact Alarm inputs A1 6 Open or close A1 6 to GND Normal operation A2 A3 D Any contractors normally open or closed In spite of all efforts to produce appliances of unequalled reliability Liebherr strongly recommends that the volt free contact is wired into some kind of independent and external warning system Please take a few moments to consider the value of the contents of the refrigerators and freezers under your supervision The cost of such a warning system is often negligible in comparison to the value of the contents 7 LKPv and LGPv laboratory appliances with Profi Controller Interface for optional NTC product temperature probe All LKPv and LGPv models have an integrated interface for connecting an optional available NTC prod
23. reduce the risk of loss of contents Temperature door open and power failure alarms High and low temperature alarms All LK U v LCv LK U exv LG U ex and LGT models have integrated high and low internal air temperature alarms with both audio and visual signals The factory settings for the alarm limits are 1 1K in relation to the set temperature If the set temperature is altered to meet a specific storage temperature requirement then the alarm settings move in parallel and do not need to be adjusted separately There is a 60 minute delay to avoid unwanted alarms due to e g door opening The alarm parameters can however be adjusted by the user to suit individual requirements Door open alarm All LK U v LCv LK U exv LG U ex and LGT models register when doors are left open or ajar and have an integrated audio and visual door open alarm This alarm has a 1 minute delay Power failure alarm All LK U v LCv LK U exv LG U ex and LGT models indicates a visual power failure alarm after the return of the power supply The power failure alarm remains until it is manually reset Internal system alarm The following alarm is related to internal self checks of the electronic controller probes While this might not be immediately relevant to the every day operation of the cabinets it does provide added security by warning probably before the air temperature probe registers an alarm condition Probe failure alarm As a self control system de
24. th Profi Controller RS 485 interface and optional signal converter All LKPv and LGPv models have an RS 485 interface If an RS 485 monitoring system is not already in place a converter kit is available as an optional extra to convert the RS 485 signal to an RS 232 signal and allow connection to a PC or laptop The RS 485 bus connection is made using standard shielded data cables e g type LIYCY 2 x 0 14 mm The maximum possible length of the data lines depends on the quality of the components used The maximum range is 500 m A maximum of 20 appliances can be wired in series BUS line Za appliance 1 appliance 2 jappliance 20 Dedicated software is provided in the accessory package allowing visualisation analysis and export to other formats for storage The software reads the air probe temperature at 2 minute intervals and records alarm conditions When an alarm condition is registered the software will warn on the PC on which the software is running If this PC is not supervised e g at night or over weekends then the alarm signal might not be recognised In order to avoid unrecognised alarms the software includes an email function which sends an email in case of an alarm condition to predefined email addresses These emails can be easiliy checked with a smartphone Therefore the user will be warned without having direct access to a computer Networking Both laboratory appliances with Profi Co
25. uct temperature probe to the Profi controller The controller can be set to display either the internal air temper ature as registered by the air probe or the temperature registered by the product probe or both Also the temperature alarm limits as well as the temperature alarm delay for the product temperature probe can be adjusted by the user to suit individual requirements In addition the product temperature can be monitored on an external documentation system via the RS 485 interface Whereas the air probe is in a fixed position the product probe will be located by the user e g in a phial or in a measurement package in order to simulate a product temperature The product temperature probe is water resistant and resistant to corrosion IP 68 and AISI 316 It complies with all relevant NSF standards Due to possible tolerances of the product temperature probe the temperature displayed can differ from the product probe temperature Using the calibration function the temperature displayed can be aligned with the product probe temperature at as many as three temperature points The correction value for the compensation of the differences can be adjusted in 0 1 C steps 0 8 C LKPv and LGPv laboratory appliances with Profi Controller Safety feature table EA Gp LE tL LKPv 6520 LKPv 6522 LKPv 8420 LKPv 1420 LKPv 1422 LGPv 6520 LGPv 8420 LGPv 1420 Profi Controller Spark free interior No No No No No No No No High Low temperature al
26. um internal air temperatures measured during this alarm condition period are registered Internal temperature memory This function stores to the memory the internal temperature profile at 4 minute intervals 2800 temperature logs are stored to memory which corresponds to approximately a 7 day logging period Special safety functions Solid state relay for maximum reliability The LKPv and LGPv models all have a solid state relay guaranteed to gt 1 billion compressor start cycles As well as allowing very accurate temperature control this feature practically excludes the possibility of burnt relay contacts as a cause for extreme internal temperatures Double fan cooling All LKPv and LGPv modells have a double internal fan arrangement so that in case of one defective fan the cooling system continues to function at reduced capacity The highly reliable fans Liebherr uses are guaranteed to 80 000 hrs operating time LIEBHERR LIEBHERR MEDine f 18 07 2009 l 12 00 18 00 00 00 06 00 12 00 18 00 00 00 19 07 2009 06 00 12 00 LKPv and LGPv laboratory appliances with Profi Controller Temperature and alarm documentation Liebherr Mediline refrigerators and freezers with Profi Controller help to protect your inventory These cabinets offer a variety of features and options designed both for external monitoring of the internal temperatures the product temperatures and alarm con
27. up the controller to prevent the product temperature from dropping below 2 C pA LK U v LCv LK Ujexv LG U ex and LGT laboratory appliances with Comfort Controller Temperature and alarm documentation Liebherr Mediline refrigerators and freezers with Comfort Controller help to protect your inventory These cabinets offer a variety of features and options designed both for external monitoring of the internal temperatures the product temperatures and alarm conditions to greatly reduce the risk of loss of contents External temperature and alarm monitoring connection RS 485 interface and optional signal converter All LK U v LCv LK U exv and LG U ex models have an integrated RS 485 interface If an RS 485 monitoring system is not already in place a converter kit is available as an optional extra to convert the RS 485 signal to an RS 232 signal and allow connection to a PC or laptop The RS 485 bus connection is made using standard shielded data cables e g type LIYCY 2 x 0 14 mm2 The maximum possible length of the data lines depends on the quality of the components used The maximum range is 500m A maximum of 20 appliances can be wired in Series Dedicated software is provided in the accessory package allowing visualisation analysis and export to other formats for storage The software reads the air probe temperature at 2 minute intervals and records alarm conditions When an alarm condition is registered the software will warn on
28. ure Set temperature If the cabinet is operated at 20 C it is recommended to reduce the predefined offset of 2 7 K to 1 0 K See user manual 31
29. urements tin min 12 LKPv and LGPv laboratory appliances with Profi Controller Results according to NF X 15 140 The evaluation of air temperatures of the LKPv and LGPv models according to NF X 15 140 using a PT 100 temperature probe with 25 g copper leads to the following results LKPv 6520 8 0 2 oe UG oo 50 C max 8 U mean value warmest probe expanded measurement uncertainty Sy 1G BYU Al OG H Gradient V__ AMG min Os aU mean value coldest probe expanded measurement uncertainty BO 30C 29C LO AE Gradient HO 1 8 K 0 9 K 0 9 K from tl i t3 t4 t5 t6 t t8 t9 set temperature Probes Max Fluktuation 1 0 K e Average probe temperature Set temperature LKPv 6522 8 0 C ou 7 0 C O12 1S OG 0 1G SUG 49 C 4 0 C Sone BS AoC Gradient HO 2 3 K 1 4 K 0 9 K from ti t2 is t4 t5 t6 t t8 t9 set temperature Probes 20C Max Fluktuation 1 6 K e Average probe temperature Set temperature lo LKPv and LGPv laboratory appliances with Profi Controller LKPv 1420 c eee eee ee e O OG max 8 iG Un mean value warmest probe expanded measurement uncertainty e Arrr so 4 Se ee es 45 C ool E Doran 3o CHi ede YY a Zoe 2026 Gradient HO 2 0K 0 5K 1 5K from t1 t2 t3 t4 t5 t6 ul t8 t9 set temperature Probes Max fluctuation 1 2 K e Average probe temperature Set temperature LKPv 142
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