Liebherr WKt 4552 User Manual
Laboratory
technical
sales manual
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
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.
3
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.
4
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
5
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
6
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.
7
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
8
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
9
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
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 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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