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

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.

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.

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

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

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

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

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.

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

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

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 & 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

centred

7 8

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.”

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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