Page 1
Laboratory
technical
sales manual
Page 2
Contents
LKPv and LGPv laboratory appliances
with Profi-Controller
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(U)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
External temperature and alarm monitoring connection
External alarm contact connection
Product temperature monitoring connection
Safety feature table
Temperature consistency and distribution according to NF X 15 -140
Description of the NF X 15-140 test procedure
Results according to NF X 15-140
Loading plan:
low temperature chest freezers with kryo racks
Pharmacy refrigerators compliant to DIN 58345
2
Page 3
Doorvoermogelijkheid PT 100
Bovenin de binnenruimte is een
opening (Ø 7,6 mm) aangebracht
die de mogelijkheid biedt een
externe temperatuurvoeler of een
andere meetverbinding door te
voeren.
Verlicht tekstdisplay
Tiptoetsbediening met hygiënisch
vuilbestendig foliedisplay en toets-
blokkering. Keuze uit 5 talen (Engels,
Duits, Frans, Spaans en Italiaans).
Temperatuur wordt op 0,1°C nauw-
keurig aangegeven.
Beveiligd bij stroomuitval
Een 12V accu voorkomt dat data
verloren gaan. Gedurende 72 uur
wordt het temperatuurverloop
geregistreerd en wordt, indien
Optisch en akoestisch alarm
Een deur- en temperatuuralarm
waarschuwt bij een ongewenste
temperatuurverandering van 2K.
30 Alarmsituaties worden bewaard
en kunnen via het display of de in-
frarood interface worden uitgelezen.
Aansluiten op centale
Met een seriële interface RS 485 of
potentiaalvrij contact is aansluiten op
een centraal log- of alarmsysteem
mogelijk. Iedere 2 minuten worden
tijd, datum en temperatuur exact
geregistreerd.
Temperatuurregistratie
Iedere 4 minuten worden datum, tijd
en temperatuur, evenals eventuele
alarmmeldingen, bewaard. Na 2.800
registraties (~ 7,5 dag) worden data
LKPv and LGPv laboratory appliances with Profi-Controller
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 /– 2 K 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 30 minute delay to avoid unwanted
All LKPv and LGPv modells register when doors are left open or ajar and have an integrated audio and visual
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
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
alarms due to e.g. door opening.
Door-open alarm
door-open alarm. This alarm has a 1 minute delay which can be adjusted.
Power failure alarm
monitoring via the RS 485 interface continue to function during power failure for up to 72 hrs.
Internal system alarms
The following 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.
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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 minimum internal air temperatures
This function stores to the memory the internal temperature profile at 4-minute intervals. 2800 temperature
LKPv and LGPv laboratory appliances with Profi-Controller
The LKPv and LGPv models all have a solid-state relay guaranteed to > 1 billion compressor start cycles. As
well as allowing very accurate temperature control this feature practically excludes the possibility of burnt
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
Internal memory functions
Internal alarm memory
measured during this alarm condition period are registered.
Internal temperature memory
logs are stored to memory, which corresponds to approximately a 7-day logging period.
Special safety functions
Solid-state relay for maximum reliability
relay contacts as a cause for extreme internal temperatures.
Double fan cooling
40 °C
30 °C
20 °C
10 °C
0 °C
-10 °C
-20 °C
-30 °C
16.07.2009
12:00
18:00
17.07.2009
06:0000:00 12:00 18:00
18.07.2009
06:0000:00 12:00 18:00
19.07.2009
06:0000:00 12:00 18:00
guaranteed to 80 000 hrs operating time.
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Liebherr
Temperature
Monitoring
Software for
Serial Interface &
Infrared key
Deutsch
English
Français
Italiano
Español
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
red interface on the cabinet to the “infrared key”. This “key” is then connected by cable to a PC or laptop
ware allows visualisation and analysis of the temperature data in various formats including a graph. The data
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 conditions to greatly reduce
the risk of loss of contents.
External temperature and alarm
monitoring connections
Infrared interface and optional infrared key
this data an infrared device (“key”) is available as an optional extra. The data is transferred from the infra-
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.
The optional kit includes all the necessary components: key, cable and software including manual. The soft-
can also be exported to Excel, Word and other standard formats for storage or further analysis.
Example: visualisation of temperature data
40 °C
36 °C
32 °C
28 °C
24 °C
20 °C
16 °C
12 °C
8 °C
4 °C
0 °C
– 4 °C
– 8 °C
– 12 °C
– 16 °C
– 20 °C
– 24 °C
– 28 °C
16.07.2009
12:00
16.07.2009
18:00
17.07.2009
00:00
17.07.2009
06:00
17.07.2009
12:00
17.07.2009
18:00
18.07.2009
00:00
18.07.2009
06:00
18.07.2009
12:00
18.07.2009
18:00
19.07.2009
00:00
19.07.2009
06:00
Internal temperature
19.07.2009
12:00
19.07.2009
18:00
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Liebherr
Temperature
Monitoring
Software for
Serial Interface &
Infrared key
Deutsch
English
Français
Italiano
Español
. The
maximum possible length of the data lines depends on the quality of the components used. The maximum
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
LKPv and LGPv laboratory appliances with Profi-Controller
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
RS 485 interface and optional signal converter
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
2
BUS line
range is 500 m. A maximum of 20 appliances can be wired in series.
appliance 1 appliance 2 appliance 20
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
RS 485
+ - s
Optimum:
Shielded Twisted Pair
Terminator
120 Ohm
- + s
- + s - + s
Address 1 Address 2 Address 3
Terminator
120 Ohm
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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
Normal operation Alarm condition
e.g. green lamp
indicating normal
opretaion
external power supply
N.O.
COM
N.C.
+
e.g. red lamp
indicating alarm
condition
-
external power supply
N.O.
COM
N.C.
+
-
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 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
GND
Open or close A1– 6 to GND
Normal operation
COM
N.C.
Alarm condition
N.O.
COM
GND
A1 A2 A3 A4 A5 A6
Any contractors
normally open or closed
GND
GND
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.
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LKPv and LGPv laboratory appliances with Profi-Controller
Product temperature monitoring connection
Interface for optional NTC product temperature probe
All LKPv and LGPv models have an integrated interface for connecting an optional available NTC product
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
-0.4°C
+0.5°C
Cal.1 1.0°C 0.5°C Cal.2 8.0°C -0.4°C Cal.3 15.0°C 0.8°C
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LKPv and LGPv laboratory appliances with Profi-Controller
Safety feature table
Laboratory appliances with
Profi-Controller
Spark-free interior No No No No No No No No
High / Low temperature alarm, 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
Power failure alarm through battery backup
for 72h, audio and visual
Volt-free contact for external alarm signal Yes Yes Yes Yes Yes Yes Yes Yes
RS 485 data transfer interface Yes Yes Yes Yes Yes Yes Yes Yes
Infrared data transfer interface Yes Yes Yes Yes Yes Yes Yes Yes
Infrared data transfer key with data monitoring
software
RS 485 / RS 232 converter with data
monitoring software
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 Yes Yes Yes Yes
LKPv 6520 LKPv 6522 LKPv 8420 LKPv 1420 LKPv 1422 LGPv 6520 LGPv 8420 LGPv 1420
Yes Yes Yes Yes Yes Yes Yes Yes
Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory
Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory
Condenser and evaporator temperature alarms Yes Yes Yes Yes Yes Yes Yes Yes
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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 & 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 % 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 characterisation forms a supposedly representative sample of the working space.”
The characterisation is performed using nine probes; one located at each corner, one in the centre of the working space.
Location of the probes used for characterisation
1/10 T
1/10 B
2 3
1/10 H
1
4
5
centred
7 8
6
9
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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 H0
increased by their expanded uncertainty U
, within the working space during the measurement time.”
mj
Gradient: “Distribution of temperatures within the chamber“
max = (mean value warmest probe + expanded measurement uncertainty)
min = (mean value coldest probe – expanded measurement uncertainty)
Example: Gradient (Homogeneity)
Maximum value
is the maximum difference, obtained in an achieved environment, between the mean values of measurements 0mj
H0 = max (0
-mj+Umj) – min (0-mj-Umj)
Gradient H0
Minimum value
Measurement period
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.
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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
in °C
0
Sensor (j) Sensor with greatest difference
A B B
Duration of measurements
Maximum
fluctuation
m
S0
Fluctuation
of a sensor
j
S0
B
t
in min
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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 thermal mass
shows the following results:
LKPv 6520
8,0 °C
7,5 °C
7,0 °C
6,5 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
6,0 °C
5,5 °C
5,0 °C
mj
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
Average probe temperature
min (0
t1 t2 t3 t4 t5 t6 t7 t8 t9
LKPv 6522
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
max (0
H0= Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
Gradient H0- : 1.8 K (+ 0.9 K / – 0.9 K from
set temperature)
Max. fluctuation: 1.0 K
5,5 °C
5,0 °C
4,5 °C
4,0 °C
min (0
3,5 °C
3,0 °C
2,5 °C
2,0 °C
Average probe temperature
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
– Umj) = mean value coldest probe – expanded measurement uncertainty
Gradient H0- : 2.3 K (+1.4 K / – 0.9 K from
set temperature)
Probes
Max. fluctuation: 1.6 K
Set temperature
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LKPv and LGPv laboratory appliances with Profi-Controller
LKPv 8420
8,0 °C
7,5 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
3,0 °C
mj
2,5 °C
2,0 °C
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
H0 = Gradient
Gradient H0- : 1.74 K (+0.9 K / – 0.84 K from
set temperature)
Probes
Max. fluctuation: 1.5 K
Set temperature
LKPv 1420
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
Average probe temperature
max (0
min (0
t1 t2 t3 t4 t5 t6 t7 t8 t9
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 2.0 K (+0.5 K / – 1.5 K from
set temperature)
Max. fluctuation: 1.2 K
14
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LKPv and LGPv laboratory appliances with Profi-Controller
LKPv 1422
8,0 °C
7,5 °C
7,0 °C
6,5 °C
max (0
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
min (0
3,0 °C
2,5 °C
2,0 °C
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 2.6 K (+1.5 K / – 1.1 K from
set temperature)
Max. fluctuation: 1.6 K
LGPv 6520
-17.0 °C
-17.5 °C
-18.0 °C
-18.5 °C
-19.0 °C
-19.5 °C
-20.0 °C
-20.5 °C
-21.0 °C
-21.5 °C
-22.0 °C
-23.0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Gradient H0- : 3.0 K (+1.75 K / –1.25 K from
set temperature)
Average probe temperature
Set temperature
Max. fluctuation: 3.6 K
15
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LKPv and LGPv laboratory appliances with Profi-Controller
LGPv 8420
– 17,0 °C
– 17,5 °C
max (0
– 18,0 °C
– 18,5 °C
– 19,0 °C
– 19,5 °C
– 20,0 °C
– 20,5 °C
– 21,0 °C
– 21,5 °C
– 22,0 °C
– 22,5 °C
min (0
– 23,0 °C
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 3.52 K (+2.0 K / – 1.52 K from
set temperature)
Max. fluctuation: 4.3 K
LGPv 1420
–17.0 °C
–17.5 °C
–18.0 °C
–18.5 °C
–19.0 °C
–19.5 °C
–20.0 °C
–20.5 °C
–21.0 °C
–21.5 °C
–22.0 °C
–23.0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Gradient H0- : 3.5 K (+1.5 K / – 2.0 K from
set temperature)
Average probe temperature
Set temperature
Max. fluctuation: 3.9 K
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Page 17
Doorvoermogelijkheid PT 100
Bovenin de binnenruimte is een
opening (Ø 7,6 mm) aangebracht
die de mogelijkheid biedt een
externe temperatuurvoeler of een
andere meetverbinding door te
voeren.
Verlicht tekstdisplay
Tiptoetsbediening met hygiënisch
vuilbestendig foliedisplay en toets-
blokkering. Keuze uit 5 talen (Engels,
Duits, Frans, Spaans en Italiaans).
Temperatuur wordt op 0,1°C nauw-
keurig aangegeven.
Beveiligd bij stroomuitval
Een 12V accu voorkomt dat data
verloren gaan. Gedurende 72 uur
wordt het temperatuurverloop
geregistreerd en wordt, indien
Optisch en akoestisch alarm
Een deur- en temperatuuralarm
waarschuwt bij een ongewenste
temperatuurverandering van 2K.
30 Alarmsituaties worden bewaard
en kunnen via het display of de in-
frarood interface worden uitgelezen.
Aansluiten op centale
Met een seriële interface RS 485 of
potentiaalvrij contact is aansluiten op
een centraal log- of alarmsysteem
mogelijk. Iedere 2 minuten worden
tijd, datum en temperatuur exact
geregistreerd.
Temperatuurregistratie
Iedere 4 minuten worden datum, tijd
en temperatuur, evenals eventuele
alarmmeldingen, bewaard. Na 2.800
registraties (~ 7,5 dag) worden data
LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
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 +3 /–3 K 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 15 minutes
delay to avoid unwanted alarms due to e.g. door opening. The alarm parameters can however be adjusted
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, and can be adjusted between
All LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT models indicates a visual power failure alarm after the return of
As a self-control system, defective probes are registered and the controller causes an audio and visual
alarm signal. In case of an air-probe error the controller has pre-defined operating modes to maintain the
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 reduce the risk of loss of contents .
Temperature, door-open and power failure alarms
High and low temperature alarms
by the user to suit individual requirements.
Door-open alarm
1 and 5 minutes.
Power failure alarm
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
internal temperature at + 5 °C.
17
Page 18
In order to ensure maximum reliability, the Comfort-Controller has a heavy-duty compressor relay thus
LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
This function stores to memory details of the last three temperature and power failure alarms. Time and
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
Internal memory functions
Internal alarm memory
date of the start and the duration of the alarm conditions are registered.
Min. / max. temperature memory
Min
up to a period of ~ 40 days.
Max
Special safety function
Electro-mechanical + 2 °C safety thermostat for laboratory refrigerators with Comfort-Controller
reducing the possibility of burned relay contacts. Should however a defect occur, an additional safety ther-
mostat backs up the controller to prevent the product temperature from dropping below +2 °C.
+ 2 °C
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Liebherr
Temperature
Monitoring
Software for
Serial Interface &
Infrared key
Deutsch
English
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LK(U)v, LCv, LK(U)exv, 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 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 easily 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
RS 485
+ - s
Optimum:
Shielded Twisted Pair
BUS line
appliance 1 appliance 2 appliance 20
Terminator
120 Ohm
Terminator
120 Ohm
- + s
- + s - + s
Address 1 Address 2 Address 3
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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 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
Normal operation Alarm condition
e.g. green lamp
indicating normal
opretaion
external power supply
N.O.
COM
N.C.
+
e.g. red lamp
indicating alarm
condition
-
external power supply
N.O.
COM
N.C.
+
-
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
GND
Open or close A1– 6 to GND
Normal operation
COM
N.C.
Alarm condition
N.O.
COM
GND
A1 A2 A3 A4 A5 A6
Any contractors
normally open or closed
GND
GND
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.
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
Product temperature monitoring connection
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 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 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.
+0.5 °C
Cal. 5.0 °C + 0.5 °C
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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
Spark-free interior No No Yes Yes No No Ye s Ye s No
High / Low temperature alarm, audio and visual
Door-open alarm, audio and visual Yes Yes Yes Yes Yes Ye s Ye s Ye s Yes
Power failure warning after power
supply is returned, visual
Volt-free contact for external alarm
signal
RS 485 data transfer interface Yes Yes Yes Yes Ye s Yes Yes Yes Yes
RS 485 / RS 232 converter with
data monitoring software
NTC product temperature probe Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory
Internal alarm memory Yes Yes Yes Yes Ye s Yes Yes Yes Yes
Min. / Max. temperature memory Yes Yes Yes Yes Yes Yes Ye s Ye s Ye s
+2°C safety thermostat Yes Yes Yes No Ye s Ye s Yes No
Access port for e.g. PT 100 probe Yes Yes Ye s Ye s Ye s Yes Yes Yes Yes
Probe failure alarm Yes Yes Yes Ye s Yes Yes Yes Yes Ye s
LKUv 1610 LKUv 1612 LKUexv 1610 LGUex 1500 LKv 3910 LKv 3912 LKexv 3910 LGex 3410 LCv 4010
Yes Yes Yes Yes Ye s Yes Yes Yes Yes
Yes Yes Yes Yes Ye s Yes Yes Yes Yes
Yes Yes Yes Yes Ye s Yes Yes Yes Yes
Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory Accessory
For refrigerator
compartment
Low temperature freezers
to – 45 °C
Spark-free interior No No No
High / Low temperature alarm
audio and visual
Lid-open alarm,
audio and visual
Power failure warning after power
supply is returned, visual
Volt-free contact
for external alarm signal
RS 485 data transfer
interface
RS 485 / RS 232 converter with
data monitoring software
NTC product temperature probe Accessory Accessory Accessory
Internal alarm memory Yes Yes Yes
Min. / Max.
temperature memory
Access port for e.g. PT 100 probe Ye s Yes Yes
Probe failure alarm Yes Yes Yes
LGT 2325 LGT 3725
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Accessory Accessory Accessory
Yes Yes Yes
LGT 4725
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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 & 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 % 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 characterisation forms a supposedly representative sample of the working space.”
The characterisation is performed using nine probes; one located at each corner, one in the centre of the working space.
Location of the probes used for characterisation
1/10 T
1/10 B
2 3
1/10 H
1
5
centred
4
7 8
6
9
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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 H0
increased by their expanded uncertainty U
, within the working space during the measurement time.”
mj
Gradient: “Distribution of temperatures within the chamber“
max = (mean value warmest probe + expanded measurement uncertainty)
min = (mean value coldest probe – expanded measurement uncertainty)
Example: Gradient (Homogeneity)
Maximum value
is the maximum difference, obtained in an achieved environment, between the mean values of measurements 0mj
H0 = max (0
-mj+Umj) – min (0-mj-Umj)
Gradient H0
Minimum value
Measurement period
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.
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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
in °C
0
Sensor (j) Sensor with greatest difference
A B B
Duration of measurements
Maximum
fluctuation
m
S0
Fluctuation
of a sensor
j
S0
B
t
in min
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
Results 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 thermal mass shows the following results:
LKUv 1610
8,0 °C
7,5 °C
7,0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
6,5 °C
6,0 °C
5,5 °C
5,0 °C
mj
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
LKUv 1612
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
max (0
H0 = Gradient
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
Gradient H0- : 2.9 K (+1.3 K / –1.6 K from
set temperature)
Max. fluctuation: 2.5 K
H0 = Gradient
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
min (0
2,5 °C
2,0 °C
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 4.0 K (+2.0 K / – 2.0 K from
set temperature)
Max. fluctuation: 3.3 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
LKUexv 1610
8,0 °C
7,5 °C
max (0
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
min (0
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 4.1 K (+1.6 K / –2.5 K from
set temperature)
Max. fluctuation: 3.0 K
LGUex 1500
-17.0 °C
-17.5 °C
-18.0 °C
-18.5 °C
-19.0 °C
-19.5 °C
-20.0 °C
-20.5 °C
-21.0 °C
-21.5 °C
-22.0 °C
-22.5 °C
-23.0 °C
-23.5 °C
-24.0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Gradient H0- : 5.7 K (+2.1 K / – 3.6 K from
set temperature)
Average probe temperature
Set temperature
Max. fluctuation: 0.80 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
LKv 3910
9,0 °C
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
1,5 °C
1,0 °C
Average probe temperature
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Set temperature
Gradient H0- : 3.0 K (+1.25 K / –1.75 K from
set temperature)
Max. fluctuation: 2.5 K
LKv 3912
9,0 °C
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
1,5 °C
1,0 °C
Average probe temperature
max (0
min (0
t1 t2 t3 t4 t5 t6 t7 t8 t9
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 4.2 K (+1.8 K / – 2.4 K from
set temperature)
Max. fluctuation: 3.7 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
LKexv 3910
8,0 °C
7,5 °C
7,0 °C
max (0
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
min (0
2,5 °C
2,0 °C
t1 t2 t3 t4 t5 t6 t7 t8 t9
Average probe temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Set temperature
Gradient H0- : 2.8 K (+1.2 K / –1.6 K from
set temperature)
Max. fluctuation: 3.4 K
LGex 3410
-17.0 °C
-17.5 °C
-18.0 °C
-18.5 °C
-19.0 °C
-19.5 °C
-20.0 °C
-20.5 °C
-21.0 °C
-21.5 °C
-22.0 °C
-23.0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Gradient H0- : 2.9 K (+1.4 K / – 1.5 K from
set temperature)
Average probe temperature
Set temperature
Max. fluctuation: 0.40 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
LCv 4010 – Evaluation of refrigerator compartment
9,0 °C
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
1,5 °C
1,0 °C
Average probe temperature
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Set temperature
Gradient H0- : 3.4 K (+1.8 K / –1.6 K from
set temperature)
Max. fluctuation: 4.0 K
LCv 4010 – Evaluation of freezer compartment
– 16,5 °C
– 17,0 °C
– 17,5 °C
– 18,0 °C
– 18,5 °C
– 19,0 °C
– 19,5 °C
– 20,0 °C
– 20,5 °C
– 21,0 °C
– 21,5 °C
– 22,0 °C
– 22,5 °C
– 23,0 °C
– 23,5 °C
– 24,0 °C
Average probe temperature
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Set temperature
Probes
H0 = Gradient
Gradient H0- : 6.0 K (+2.6 K / – 3.4 K from
set temperature)
Max. fluctuation: 3.4 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
LGT 2325 *
– 41,0 °C
– 41,5 °C
– 42,0 °C
– 42,5 °C
– 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
– 47,5 °C
– 48,0 °C
– 48,5 °C
Average probe temperature
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Set temperature
Gradient H0-: 4,58 K (+ 2,45 K/-2,13 K from
set temperature)
Max. fluctuation: 1,8 K
*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 *
-42,0 °C
-42,5 °C
-43,0°C
-43,5°C
-44,0°C
-44,5 °C
-45,0 °C
-45,5 °C
-46,0 °C
+ Umj) = mean value warmest probe + expanded measurement uncertainty
max (0
mj
H0 = Gradient
-46,5 °C
-47,0 °C
-47,5°C
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
-48,0 °C
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Average probe 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).
Set temperature
Gradient H0- : 3,23 K (+ 0,82 K/-2,41 K from
set temperature)
Max. fluctuation: 0,5 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
LGT 4725 *
-42,0 °C
-42,5 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
-43,0°C
-43,5°C
-44,0°C
H0 = Gradient
-44,5 °C
-45,0 °C
-45,5 °C
-46,0 °C
-46,5 °C
-47,0 °C
-47,5°C
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
-48,0 °C
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Average probe 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).
Set temperature
Gradient H0-: 3,27 K (+ 0,8 K/-2,47 K from
set temperature)
Max. fluctuation: 1,1 K
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LK(U)v, LCv, LK(U)exv, LG(U)ex and LGT laboratory appliances with Comfort-Controller
Loading plan: low temperature chest freezers with kryo racks (height of kryo boxes 50 mm)
LGT 2325 L GT 3725
Interior dimensions (W/D/H) in mm
Number of racks: 140/140/604 mm
Number of racks: 140/140/222 mm
Number of boxes: 130/130/50 mm
Maximum height of racks:
Maximum height of racks above the compressor:
889/410/630 1170/500/650
8 18
2 3
96 210
630 mm 650 mm
375 mm 380 mm
LGT 4725
Interior dimensions (W/D/H) in mm
Number of racks: 140/140/604 mm
Number of racks: 140/140/222 mm
Number of boxes: 130/130/50 mm
Maximum height of racks:
Maximum height of racks above the compressor:
1445/500/650
24
3
276
650 mm
380 mm
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Pharmacy refrigerators compliant to DIN 58345
Pharmacy refrigerators compliant to
DIN 58345
In order to comply with the DIN 58345 standard, the MKv and MKUv models have the following specifications:
1) To avoid any unwanted manipulation, the set temperature is fixed at +5 °C to guarantee maximum safety
2) Likewise the offset values of the probes cannot be changed
3) Also alarm limits cannot be changed from the default values +2/+8°C
4) An additional probe is positioned at the warmest point within the unit and this temperature is displayed on the controller
5) The MKv 3912 has a load line to prevent pharmaceuticals being placed at the very top of the compartment
6) In order to prevent product loss or detriment due to incorrect storage, an integrated evaporator cover keeps products
away from the cold surface of the evaporator
7) The integrated power failure alarm gives an acoustic warning immediately upon power failure
Otherwise the MKv and MKUv models have the same features as the LKv and LKUv equivalents.
Safety feature table
Pharmacy refrigerators
compliant to DIN 58345
Spark-free interior No No No No
High / Low temperature alarm
audio and visual
Door-open alarm, audio and visual Yes Yes Yes Yes
Power failure warning immediately
upon power failure l
Volt-free contact
for external alarm signal
RS 485 data transfer
interface
RS 485 / RS 232 converter with
data monitoring software
NTC product temperature probe Accessory Accessory Accessory Accessory
Internal alarm memory Yes Yes Yes Yes
Min. / Max.
temperature memory
MK v 3910 MKv 3912
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Accessory Accessory Accessory Accessory
Yes Yes Yes Yes
MKU v 1610 MK U v 1612
+ 2 °C safety thermostat Yes Yes Yes Yes
Access port for e.g. PT 100 probe Ye s Yes Yes Yes
Probe failure alarm Yes Yes Yes Yes
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Pharmacy refrigerators compliant to DIN 58345
Results according to NF X 15-140
The evaluation of air temperatures of the MK(U)v models according to NF X 15-140 using a PT 100 temperature probe shows the following results:
MKv 3910
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
min (0
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Gradient H0- : 4.20 K (+2.4 K / –1.8 K from
set temperature)
Average probe temperature
MKv 3912
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
max (0
min (0
t1 t2 t3 t4 t5 t6 t7 t8 t9
Set temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0
= Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Max. fluctuation: 3.10 K
Gradient H0- : 4.46 K (+3.1 K / –1.36 K from
set temperature)
Average probe temperature
Set temperature
Max. fluctuation: 3.60 K
35
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Pharmacy refrigerators compliant to DIN 58345
MKUv 1610
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
max (0
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0 = Gradient
min (0
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
t1 t2 t3 t4 t5 t6 t7 t8 t9
Probes
Gradient H0- : 3.31 K (+2.0 K / –1.31 K from
set temperature)
Average probe temperature
MKUv 1612
8,5 °C
8,0 °C
7,5 °C
7,0 °C
6,5 °C
6,0 °C
5,5 °C
5,0 °C
4,5 °C
4,0 °C
3,5 °C
3,0 °C
2,5 °C
2,0 °C
max (0
min (0
t1 t2 t3 t4 t5 t6 t7 t8 t9
Set temperature
+ Umj) = mean value warmest probe + expanded measurement uncertainty
mj
H0
= Gradient
– Umj) = mean value coldest probe – expanded measurement uncertainty
mj
Probes
Max. fluctuation: 2.70 K
Gradient H0- : 4.27 K (+2.27 K / –2.00 K from
set temperature)
Average probe temperature
Liebherr laboratory refrigerators or freezers do not comply with the German Institute for Standardisation norm DIN 58371 regarding the
requirements for the storage of conserved blood and DIN 58375 regarding the requirements for the storage of blood plasma. The MKv and
MKUv models comply with the German Institute for Standardisation norm DIN 58345 which refers to the specification of pharmacy refrigerators.
All other Liebherr refrigerators and freezers in this catalogue do not comply with this standard.
Set temperature
Max. fluctuation: 4.00 K
36
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