Pressure | Temperature | Level

Measurement technology
for refrigeration

Alexander Wiegand,
Chairman and CEO,
WIKA

About us2

As a family-run business acting globally, with 11,200 highly
qualified employees, the WIKA group of companies is aworldwide leader in pressure and temperature measurement.
The company also sets the standard in the measurement oflevel, force and flow, and in calibration technology.

With manufacturing locations around the globe, WIKA
ensures flexibility and the highest delivery performance.
Every year, over 50 million quality products, both standard
and customer-specific solutions, are delivered in batches of
1 to over 10,000 units.

Founded in 1946, WIKA is today a strong and reliable partner
for all the requirements of industrial measurement technology, thanks to a broad portfolio of high-precision instruments
and comprehensive services.

With numerous wholly owned subsidiaries and partners,
WIKA competently and reliably supports its customers
worldwide. Our experienced engineers and sales experts are
your competent and dependable contacts locally.

WIKA – your partner for refrigeration
The refrigeration cycle, as one of the components of any refrigeration application, is an important lever to optimise theefficiency of the entire system. This is why monitoring and controlling its various physical parameters is so essential.

Cooling occurs by evaporating a liquid refrigerant in anevaporator. The heat required for evaporation is thus
extracted from the air to be cooled, which drops intemperature.
The evaporated refrigerant then leaves the evaporator
at a low evaporation pressure and is drawn through a(refrigeration) compressor to a higher pressure (thecondensation pressure). At this high condensation pressure,the heat extracted during the cooling process is dissipatedthrough the condenser (water or air-cooled) until thegas condenses into a liquid at the same pressure as thecondensation pressure.

For this reason, WIKA focuses on the reliability and accuracyof the measuring instruments, as well as strong delivery
performance. This brochure highlights the most importantmeasuring instruments that WIKA offers for the different
modules of a refrigeration system.
So that the system can run properly and efficiently, all themeasuring instruments must work accurately and reliably.

This liquid is injected back into the evaporator through anexpansion valve. The liquid expands during injection tothe lower evaporation pressure after which evaporation(i.e. cooling) begins again.
A cooling process is thus a cycle in which a liquid refrigerant
alternately expands to a lower pressure, evaporates and thencondenses.
Manufacturers of refrigeration systems understand how
important it is to be able to rely completely on every single
component.

Chillers

Page 4

Industrial heat pumps

Page 6

Rooftops

Page 8Air-handling heat exchanger

Page 10

Cooling for data centres

Page 12

Vehicle refrigeration

Page 14

Refrigeration andfreezing solutions

Page 163Chillers
Highest efficiency, smallest possible CO₂ footprint, low sound emissions and low costs − these are just some of thechallenges which refrigeration unit manufacturers are faced with.

To achieve this performance, the four basic components
of a chiller (compressor, condenser, expansion valve andevaporator) must be matched to each other ideally, and thecontrol system should be designed and fine-tuned for the
specific application. Each regulation system is only as goodas its individual components.
In the case of measuring instruments, this means thataccurate measurement is needed in order to be able tooperate the plant efficiently. In addition to their accuracy,instruments should feature additional properties, such as

resistance to weathering, condensation and media, to ensurethat a chiller can withstand, for example, 365 days per year
on a roof, exposed to the elements.
Not all measuring instruments have a direct influence on thecontrol. The plant itself also requires maintenance at regularintervals in order to provide reliable service for many years.
For this, reliable measuring instruments for monitoring thecondition of various elements, such as the engine oil, areindispensable tools.

124
3

Legend – Measuring locations:1234

4

Low-pressure line (suction gas)
High-pressure line (gas)High-pressure line (liquid)
Low-pressure line (liquid)

Product selection
Chillers

Temperature
12
3
4

1
2
3
4

Resistancethermometer
TF35
TF37
TF-2000
TF44
TF45
Dial thermometer
A52
R52
55

Pressure
12
3
4

1
2

Bourdon tube
pressure gauge
112.28132.28213.5323x.50Pressure transmitter
R-1

3
4

Accessories
SwitchPCA
PSM-690

Syphon910.15Valve
IV1x, IV2x5

Industrial heat pumps
For cooling applications in commercial and other non-domestic applications, such as schools, sports centres,shops and offices, larger heat pumps are used.

Via of the refrigeration circuit, unwanted heat is removed andthus the process or space is cooled. The heat absorbed by
the refrigerant can be transferred to other areas. For example, in production areas where heat is indispensable as partof the production process, such as sterilisation or drying processes. The use of the waste heat, in connection with the useof (non-critical) refrigerants, makes this technology particularly
environmentally friendly.

6415237

Legend – Measuring locations:
12345676

Low-pressure line (suction gas)
High-pressure line (gas)Heating circuit

High-pressure line (liquid)
Low-pressure line (liquid)
Evaporator

Compressor

For the control of heat pumps, pressure and temperature
measuring instruments are critical.
The measuring systems used ensure efficient operation of
the heat pump. As a result, they must be particularly reliable.

Product selection
Industrial heat pumps

Temperature
1245

1245

Resistancethermometer
TF35TF37
TF-2000
TF44
TF45
Dial thermometer
A52
R52
55

Level

Pressure
123
4

12

5

Bourdon tube
pressure gauge
111.10112.28132.28213.5323x.50Pressure transmitter
R-1

67

Optoelectronic levelswitch
OLS-C04

Float switch
RLS-1000

45

Accessories
SwitchPCA
PSM-690

Syphon910.15Valve
IV1x, IV2x7

Rooftops
Rooftops provide a pleasant feel-good climate in commercial buildings or production and storage halls.
The advantage of such a solution is that the system is installed on the roof and doesn’t take up any usable space.

This type of unit can be used either for heating only, cooling
only or a combination of both, also in conjunction with aventilation system.
As these units are installed on the roof of the building, it isimportant that the equipment and its measuring instruments
are able to withstand the ambient conditions.

1

45
3

Legend – Measuring locations:
1
2
3
4
5

8

Ambient air

High-pressure line (gas)High-pressure line (liquid)
Low-pressure line (liquid)
Low-pressure line (gas)2Air-cooled, roof-mounted systems are extremely energyefficient. The cooling is based on cooling air through theevaporation of water. The energy required for evaporation
is extracted from the air, and this therefore cools the air.
Electricity is only required for the operation of the fans which
circulate the air.

Product selection
Rooftops

Temperature
Outdoor thermometer
TF41

1

Pressure
1
2
3
4

1
2
3
4

5

Resistancethermometer
TF-2000
TF44
TF45

5

Bourdon tube
pressure gauge
112.28132.28213.53232.50233.50Pressure transmitter
R-1

1
2
3
4

5

9

Air-handling heat exchanger
Nowadays, most ventilation and air-conditioning systems are equipped with a heat exchanger, whereby
their energy efficiency is significantly improved.

The inlet gas/liquid is usually separated from the outlet gas/liquid to prevent mixing, though some systems allow themedia to be in contact with each other.

In the air-handling system the heat exchanger ensures thatthe heat from the used room air is recovered and returned to
the fresh supply air.

2EHAETA




3
1



ODA

Legend – Measuring locations:
1
2
3

10

Outdoor air (ODA)

Exhaust air (ETA / EHA)
Supply air (SUP)

SUP

Product selection
Air-handling heat exchanger

Temperature
123

Outdoor thermometer
TF41

2
3Resistancethermometer
TF40
TF-2000
TF45

Electronic ventilation
duct temperature
sensor
A2G-6011

Cooling for data centres
The digital world, both in business and for consumers, runs on data. This data is processed and stored around theworld in servers located in data centres. This is where the cloud, e-mails and the internet lives.

All servers generate a lot of heat, meaning the cooling ofdata centres has to be both reliable and energy-efficient.
For the cooling of the data centre’s buildings there are
separate cooling systems:

Pressure and temperature are monitored throughout all ofthese systems.

 Air-conditioning unit for server rooms (water/glycol/refrigerant) Air conditioner for server rooms (refrigerant/glycol/condensation water) Air-cooled and self-contained
 Air duct

5

3
1

4
2

Legend – Measuring locations:
12
3
4
5

12

Condenser coil temperature
High-pressure line (gas)High-pressure line (liquid)
Evaporator temperature

Outdoor air temperature

Product selection
Cooling for data centres

Temperature
145

5

Resistancethermometer
TF-2000
TF44
TF45
Outdoor thermometer
TF41

Pressure2323

Bourdon tube
pressure gauge
112.28132.28213.53Pressure transmitter
R-1

13

Vehicle refrigeration
In all travel vehicles on roads and rails, healthy air
circulation and climate comfort for the well-being of theoccupants play an essential role.

Also for the transport of food on trucks, trailers orcontainers, refrigeration systems are needed tomaintain the cooling chain throughout the entire
transport until arrival at the consignee‘s stable.

Buses and trains are therefore equipped with special coolingsystems. With a perfectly thought-out and nested piping
system, well-tempered fresh air is supplied to the interior andstale air is removed.

Reefer containers for worldwide trade and storage of foodand non-food products such as medicines or flowers areindispensable.

Their air conditioner has a condenser, among other things,
an evaporator, a compressor, a fan [heat exchanger] and anested piping system.
In order to keep the branched systems continuously stable,
reliable and precise measuring instruments are indispensabl.

1

2

Legend – Measuring locations:
1
2
3

14

Pressure in compressor, condenser, evaporator

Temperature in compressor, condenser, evaporator
Readout

The cooling of containers and trucks is achieved by a cooling
unit in the cargo hold. So that these can keep a constanttemperature, their refrigeration circuit is constantly monitored.
Pressure and temperature measuring instruments transmit
the measured values to the control system, so that it cancompensate the changed conditions.

Product selection
Vehicle refrigeration

Temperature
23

Resistancethermometer
TF-2000
TF44
TF45
Digital indicator
DI10

Pressure
11

Bourdon tube
pressure gauge
213.53Pressure transmitter
R-1

12
315

Refrigeration and freezing solutions
In all supermarkets, convenience stores and petrol stations, refrigerated cabinets are available for storage andpreservation of perishable foodstuffs. It is important that the cabinets work as efficiently as possible and do notconsume too much energy, while keeping the goods at the correct temperature.

On many cabinets, the temperature of the cooled goods isdisplayed.

These units are equipped with a special cooling system,
which requires pressure and temperature measurement tomaintain the correct cooling tempera­ture and the proper
functioning of the cooling system.

12
2

Legend – Measuring locations:123

16Temperature

Indication / readout
Pressure1

Product selection
Refrigeration and freezing solutions

Temperature
12

Pressure

Resistancethermometer
TF-2000
TF44

3

Pressure transmitter
R-1

Expansion
thermometer
TF58
TF59

2

Digital indicator
DI10

2

Digital indicator
TF-LCD

1

3
1

3

17

Ventilation and air-conditioning
With the product line for ventilation and air-conditioning,
WIKA offers a comprehensive range of measuring instruments for central air-handling units and ventilation systems.
Differential pressure measuring instruments, switches andtransmitters are used for monitoring filters and ventilators.
Air flow meters and air velocity transmitters measure thetransported air quantity and its flow velocity in air ducts andair-handling systems.
By using frost protection thermostats and temperature sensors, the air-handling system is protected from icing and frost
damage.

Differential pressure | Air flow | Temperature | Humidity | Air quality

Sensor technology forventilation and air-conditioning

The brochure “Sensor technology for ventilation and air-conditioning” gives you an overview of the product portfolio
available for your application and, in particular, of the hightechnical specifications of the A2G product family.

18Further market segments

Heating technology
Whether in residential or office accommodation, in privatehouseholds or public buildings; whether with wood, oil, gasor solar power: Modern heating technology enables you
to obtain an efficient and sustained supply of heat and hotwater. This conserves resources and the environment.

Pressure | Temperature | Level

Measurement technology
for heating

WIKA offers manufacturers and distributors a comprehensive
range of pressure, temperature and level measuring instruments tailored to suit a wide range of requirements. With thisbrochure, you will receive an overview of our products andservices for heating technology.

The brochure “Heating technology” shows you the strengths
and application areas of our measuring instruments.

Heating systems

Heat pumps

Industrial boiler systems

Heat transfer and distribution stations

19

WIKA worldwide
EuropeAustria
WIKA Messgerätevertrieb
Ursula Wiegand GmbH & Co. KG
Tel. +43 1 8691631
info@wika.at / www.wika.at
Benelux
WIKA Benelux
Tel. +31 475 535500
info@wika.nl / www.wika.nl
Bulgaria
WIKA Bulgaria EOOD
Tel. +359 2 82138-10
info@wika.bg / www.wika.bg
Croatia
WIKA Croatia d.o.o.
Tel. +385 1 6531-034
info@wika.hr / www.wika.hr
Denmark
WIKA Danmark A/S
Tel. +45 4581 9600
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Finland
WIKA Finland Oy
Tel. +358 9 682492-0
info@wika.fi / www.wika.fi
France
WIKA Instruments s.a.r.l.
Tel. +33 1 71 68 10 00
info@wika.fr / www.wika.fr

Poland
WIKA Polska spółka z ogranizonąodpowiedzialnością sp. k.
Tel. +48 54 230110-0
info@wikapolska.pl
www.wikapolska.pl
RomaniaWIKA Instruments Romania S.R.L.
Tel. +40 21 4048327
info@wika.ro / www.wika.ro
RussiaAO “WIKA MERA”
Tel. +7 495-648018-0
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Serbia
WIKA Merna Tehnika d.o.o.
Tel. +381 11 2763722
info@wika.rs / www.wika.rs
Spain
Instrumentos WIKA S.A.U.
Tel. +34 933 9386-30
info@wika.es / www.wika.es
Switzerland
WIKA Schweiz AG
Tel. +41 41 91972-72
info@wika.ch / www.wika.ch

Türkiye
WIKA Instruments
Endüstriyel Ölçüm Cihazları Tic. Ltd. Şti.
Tel. +90 216 41590-66
Germany
info@wika.com.tr
WIKA Alexander Wiegand SE & Co. KG www.wika.com.tr
Tel. +49 9372 132-0
info@wika.de / www.wika.deUkraine
TOV WIKA Prylad
IrelandTel. +38 044 496 83 80
WIKA Instruments Ireland Limited
info@wika.ua / www.wika.ua
Tel. +35 386 1449 360
info@wika.ie / www.wika.co.uk
United Kingdom
WIKA Instruments Ltd
Italy
Tel. +44 1737 644-008
WIKA Italia S.r.l. & C. S.a.s.
info@wika.co.uk / www.wika.co.uk
Tel. +39 02 93861-1
info@wika.it / www.wika.it

North America

Asia

Canada
WIKA Instruments Ltd.
Tel. +1 780 4637035
info@wika.ca / www.wika.ca

ChinaBotswana
WIKA Instrumentation Suzhou Co., Ltd. WIKA Instruments Botswana (Pty.) Ltd.
Tel. +86 512 6878 8000
Tel. +267 3110013
info@wika.cn / www.wika.com.cn
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USA
WIKA Instrument, LP
Tel. +1 770 5138200
info@wika.com / www.wika.us

India
WIKA Instruments India Pvt. Ltd.
Tel. +1800-123-101010
info@wika.co.in / www.wika.co.inEgypt
WIKA Near East Ltd.
Tel. +20 2 240 13130
info@wika.com.eg / www.wika.com.eg

Gayesco-WIKA USA, LP
Tel. +1 713 4750022
info@wikahouston.com
www.wika.us

Japan
WIKA Japan K. K.
Tel. +81 3 5439-6673
info@wika.co.jp / www.wika.co.jp

Namibia
WIKA Instruments Namibia Pty Ltd.
Tel. +26 4 61238811
info@wika.com.na / www.wika.com.na

Mensor Corporation
Tel. +1 512 3964200
sales@mensor.com
www.mensor.com

Kazakhstan
TOO WIKA Kazakhstan
Tel. +7 727 225 9444
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Nigeria
WIKA WEST AFRICA LIMITED
Tel. +234 17130019
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Latin America

Korea
WIKA Korea Ltd.
Tel. +82 2 869-0505
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Saudi Arabia
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Tel. +966 53 555 0874
info@wika.sa / www.wika.sa

Malaysia
WIKA Instrumentation (M) Sdn. Bhd.
Tel. +60 3 5590 6666
info@wika.my / www.wika.mySouth Africa
WIKA Instruments Pty. Ltd.
Tel. +27 11 62100-00
sales@wika.co.za / www.wika.co.za

Philippines
WIKA Instruments Philippines Inc.
Tel. +63 2 234-1270
info@wika.ph / www.wika.ph

United Arab Emirates
WIKA Middle East FZE
Tel. +971 4 883-9090
info@wika.ae / www.wika.ae
Australia
Australia

Argentina
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Brazil
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vendas@wika.com.br
www.wika.com.br
Chile
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Tel. +56 9 4279 0308
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Colombia
Instrumentos WIKA Colombia S.A.S.
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Singapore
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Tel. +886 3 420 6052
info@wika.tw / www.wika.tw
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Tel. +66 2 326 6876
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Africa/Middle East

Australia
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Tel. +61 2 88455222
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New Zealand
WIKA Instruments Limited
Tel. +64 9 8479020
info@wika.co.nz / www.wika.co.nz

Uzbekistan
WIKA Instrumentation FE LLC
Tel. +998 71 205 84 30
info@wika.uz / www.wika.uz

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WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30 | 63911 Klingenberg | Germany
Tel. +49 9372 132-0 | info@wika.de | www.wika.de

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9018239 01/ 2024 EN

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