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Refrigeration and air-conditioning technology

Refrigeration and air-conditioning technology
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Refrigeration and air-conditioning technology - 1

Pressure Temperature Level Calibration technology IWIKAll M Part of your business

Refrigeration and air-conditioning technology - 2

Alexander Wiegand, Chairman and CEO WIKA About us As a family-run business acting globally, with over 7,900 WIKA ensures flexibility and the highest delivery is a worldwide leader in pressure and temperature both standard and customer-specific solutions, are highly qualified employees, the WIKA group of companies measurement. The company also sets the standard in the measurement of level and flow, and in calibration technology. 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-...

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Refrigeration and air-conditioning technology - 3

Application: Liquid-cooled condenser/evaporator 14 Conversion factors for pressure and temperature 22 Within the refrigeration cycle and its periphery there are many points where pressure and temperature are measured and monitored. This serves to control the plant in order to guarantee a secure process run. Some of the measuring tasks are: Indication of pressure and temperature in the lines of the refrigeration cycle on one of the main aggregates, control of fan speed or expansion valve speed, respectively, filter monitoring, temperature measurement in the cooling room, level...

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Refrigeration and air-conditioning technology - 4

Perfection in material and form In view of the increasing requirements on refrigeration plants due to new refrigerants or leak-free systems the quality requirements for measuring instruments are also increasing. Thus the right choice of materials is decisive in order to get the best possible instrument. case means taking care of parameters such as pressure, directly – which is always advisable because of the Choosing the right material that determines the quality of the temperature and field conditions. The refrigerant used is not decisive, as the case usually is not exposed to the process...

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Refrigeration and air-conditioning technology - 5

Instrument requirements Pressure gauges with electrical output signals Control systems are gaining more and more importance in The switchGAUGEs are based on a high-quality WIKA the gauge itself is no longer sufficient, rather the measured application, an integrated magnetic snap-action contact, industrial applications. Consequently, pressure indication on value must be transferred to the control system via an electrical signal, e.g. by closing or opening of a circuit. WIKA is focusing on its mechatronic product line in order to satisfy this trend. mechanical pressure gauge which has,...

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Refrigeration and air-conditioning technology - 6

Optimum connections The connection of pressure and temperature measuring instruments to the process can be carried out via thermowells and mounting devices. Thus the connection can be specifically adjusted to the individual process requirements. Mounting flanges There are three basic possibilities to mount a pressure gauge to the process – besides the connection location: ■■ Surface mounting flange ■■ Panel mounting flange Depending on the instrument version, these three options are available in several versions, e.g. steel, brass, chrome plated, polished, galvanised etc. Attention should...

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Refrigeration and air-conditioning technology - 7

Instrument requirements ++ = highly resistant + = resistant Data are only recommendations. These may deviate, e.g. if using flotation oils or additives. Furthermore, manufacturer-specific compositions of the individual elastomers may cause resistances to deviate in the maximum operating range. Even unknown parameters and conditions in practical use may result in deviations. We therefore accept no liability for the correctness of the recommendations in an application case. - = not resistant

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Refrigeration and air-conditioning technology - 8

Due to the various structural shapes and design layouts of refrigeration plants there is also a great number of different compressors. Mainly reciprocating, screw and scroll compressors are used to suck in the refrigerant at a low pressure and compress it to a higher pressure. Other criteria for differentiation are for example the number of compressing stages, the way of cooling or the ratio compressor - engine (open, semi-hermetic, hermetic). In order to monitor oil pressure and pressure in suction and discharge line of the compressor WIKA offers all necessary measuring...

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Refrigeration and air-conditioning technology - 9

steel version Bourdon tube pressure gauge with electrical output signal, stainless steel, safety version Bourdon tube pressure gauge with switch contacts, stainless DELTA-plus, differential pressure gauge with integrated working pressure indication Nominal size: Scale range: Accuracy class: Ingress protection: Data sheet: Ingress protection: IP 65 Data sheet: PV 22.02 Nominal size: Scale range: Accuracy class: Ingress protection: Data sheet: DELTA-comb, differential pressure gauge with integrated working pressure indication and micro switch DELTA-trans, differential pressure...

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Refrigeration and air-conditioning technology - 10

Bourdon tube pressure gauge, stainless steel version Bourdon tube pressure gauge, Bourdon tube pressure gauge, plastic case, lower mount (LM) plastic case, back mount (BM) Nominal size: Scale range: Accuracy class: Data sheet: Nominal size: Scale range: Accuracy class: Data sheet: Data sheet: PM 01.05 113.13 PGS21 PGS21.100/160 Bourdon tube pressure gauge, plastic case with liquid filling Bourdon tube pressure gauge, stainless steel, fixed contacts Bourdon tube pressure gauge with switch contacts, industrial series Nominal size: Scale range: Accuracy class: Ingress protection: Data...

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Refrigeration and air-conditioning technology - 11

Application: Compressor Bourdon tube pressure gauge, forged brass case with liquid filling Bourdon tube pressure gauge, stainless steel case with liquid filling Bourdon tube pressure gauge, stainless steel, safety version, without/with liquid filling GL Nominal size: Scale range: Accuracy class: Ingress protection: Data sheet: Nominal size: Scale range: Accuracy class: Ingress protection: Data sheet: Nominal size: Scale range: Accuracy class: Ingress protection: Data sheet: Bourdon tube pressure gauge, stainless steel, without/with liquid filling Differential pressure gauge with Bourdon...

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Refrigeration and air-conditioning technology - 12

TR33Strap-on temperature sensor with connecting cableResistance thermometer in miniature design Measuring range: -50 ... +200 °C Measuring element: Pt100, Pt1000, NTC, KTY Feature: ■ Connecting lead from PVC, silicone ■ Thermowell from aluminium ■ Mounting on pipe surfaces Data sheet: TE 67.14 Data sheet: TE 60.33 Sensor element: Measuring range: Pin assignment: Cable: Data sheet: 1 x Pt100, 2 x Pt100 -200 ... +600 °C 2-, 3- or 4-wire PVC, silicone, PTFE TE 60.40

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