Danfoss MP 55E Data sheet

Data Sheet

Diﬀerential pressure switch Type MP 55E

MP 55E oil dierential pressure switches are used as safety switches

MP 55E oil dierential pressure switches are used as safety switches to protect refrigeration compressors against low lubricating oil pressure.

If the oil pressure fails the oil dierential pressure control stops the compressor.

MP 55E for HCFC, HFC and HC refrigerants are equipped with gold-plated SPDT contacts, which react directly on the dierential pressure without time delay.

The units are designed to operate in explosive zones acc. to 2014/34/EU, Atex directive, explosive zone 2, surface equipment, category

MP 55E are delivered with ¼ inch solder connections to ensure a hermetic installation.

Features

• Wide regulating range,

• Can be used for deep freeze, refrigeration and air conditioning plant,

• Can be used for HCFC, HFC and HC refrigerants,

• Electrical connection at the front of the unit,

• Screwed cable entry for cables from 6 – 14 mm diameter,

• Small contact dierential

AI217686432357en-001001

345

Connection to oil pressure side of lubrication

system, OIL

Connection to suction side of refrigeration plant,

Setting disc

Test device

Terminals

Features

Specication

Stainless steel

19/11, no. 1.4306 to EN 10088

Deep-drawn steel plate

no. 1.0338 to EN 10130

Free cutting steel

no. 1.0401 to EN 10277

Dierential pressure switch, Type MP 55E

Product specications

Design and Materials

Figure 1: Design for Type MP 55E

The MP 55E pressure control only switches the dierential pressure, i.e. the dierence in pressure between the two counteracting bellows, and it is virtually independent of the absolute pressure acting on both bellows.

The MP 55E can be set for dierent dierential pressures by the setting disc (3).

The set dierential pressure can be read from the internal scale.

Table 1: Materials in contact with the medium

Features

Specication

Ambient temperature

-20 – 60 °C

Max. working pressure

PS/MWP = 17 bar

Max. test pressure

Pe = 22 bar

Screwed cable entry

Pg 13.5

Cable diameter

6 – 14 mm

Max. media temperature

80 °C

Enclosure

IP20 to EN 60529 / IEC 60529

Contact rating

Pi max: 1 W

Ui max: 30 V

Ii max: 0.1 A

Ci max: 0.5 nF

Li max: 0.2 μH

EX - zone

Non EX - zone

Electrical data for intrinsically safe specication

(for all MP 55E types):

EX certified Zenner barrier

Pi max: 1 W Ui max: 30 V Ii max: 0.1 A

Ci max: 0.5 nF Li max: 0.2 µH

Dierential pressure switch, Type MP 55E

Technical data

Table 2: Technical data for MP 55E

Electrical connection

The MP 55E pressure switch placed in explosive zone must always be wired through reliable Ex zener barrier, placed outside ex-zone, to ensure insucient energy supply to cause the ignition of surrounding atmosphere by an electrical spark or the heating of components of circuitry.

The equipment to be used for electrical load limiting must always be approved for use in the zone concerned. Cables and cable entries approved for the application must be used and can not be in contact with sharp edges. Cables must be connected with adequate stress relief that way that pulling forces can not be carried throug the cable to the terminal.

 NOTE:

A particular system can be classied in dierent zones, for dierent parts of the system.

Intrinsic safety protection method

Table 3: Intrinsic safety protection method

Must be used with certied Ex ic barrier (product matching) satisfying the input parameters.

Installation and maintenance

Only authorised persons, who are certied in installing and maintaining the systems may do the installation, maintenance and change of the switch.

In the event of strong pulsation in the system, bellows must be protected against fatigue failure by use of damping coil.

Net weight approx. 0.8 kg

Dierential pressure switch, Type MP 55E

The cycle frequency of the MP 55E switch must be kept as low as possible. The vibration level must be kept as low as possible.

Any overload of the MP 55E switch must be prevented. Overloaded or damaged apparatus must be exchanged.

Safety requirements

The MP-E can be applied on systems with R1270, R290, R600, R600a as the working uid. For countries where safety standards are not an indispensable part of the safety system Danfoss recommend the installer to get a third party approval of the system containing ammable refrigerant.

: Please follow specic selection criteria stated in the datasheet for these particular refrigerants.

MP 55E pressure switches comply with the requirements for explosive atmosphere 2014/34/EU, acc. to ATEX, zone 2.

Only apparatus designed, constructed and released by Danfoss must be used for application concerned. Danfoss can accept no responsibility in case of alterations made on the switches or the use of them against the Danfoss instructions.Original Danfoss spare parts approved for use in explosive atmosphere can only be used.

The application covers systems that must be located within the EU or EFTA and comply with the existing EU legislation, such as the directive concerning potential explosive atmosphere (ATEX) 2014/34/EU, and other related EU standards. The system where MP 55E is mounted must always comply with local directives, legislation or any other regulation applying in the area of installation. The Danfoss products comply with the requirements of ATEX directive, but Danfoss takes no responsibility for the classication of explosive zone.

Dimension and weight

Figure 2: Dimension and weight for MP 55E

Type

Dierential

range ∆p

Switch

dierential max. ∆p

Operation range LP side

Code no.

[bar]

Connection

⁄4 in. ODF solder

MP 55E

0.3 – 4.5

0.2

-1 – 12

060B530091

Dierential pressure switch, Type MP 55E

Ordering

Figure 3: Ordering for MP 55E

For R32, R290, R600, R600a, R1270

For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers, where refrigerants are listed as part of technical data.

This product is validated in accordance to EN 60079-0:2012 + A11:2013. Ignition risk is evaluated in accordance to EN 60079-11:2012. See safety requirements at the end of instruction.

Table 4: Ordering for MP 55E

Document type

Approval authority

UA declaration (EMCD/LVD)

LLC CDC EURO TYSK

EU declaration (ATEX/ ROHS)

Danfoss

Manufacturer declaration for China ROHS

Danfoss

Dierential pressure switch, Type MP 55E

Certicates, declarations and approvals

The list contains all certicates, declarations, and approvals for this product type. Individual code number may have some or all of these approvals, and certain local approvals may not appear on the list.

Some approvals may change over time. You can check the most current status at danfoss.com or contact your local Danfoss representative if you have any questions.

Table 5: Certicates, declarations and approvals

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Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specications already agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

Danfoss MP 55E Data sheet

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