Danfoss Electronics MP 55E Installation Guide

Installation guide

Pressure switch MP 55E

060R9517

Refrigerants:

R1270, R290, R600, R600a

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.

Operation range

Typ e

MP 55E -1 – 12 17 22

PS/MWP P

[bar]

test

Max. 80 °C 176 °F

15% Ag

Electrical connection

The MP-E 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

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.

the heating of components of circuitry.

Note:

The equipment to be used for electrical load limiting must always be approved for use in the

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

zone concerned.

Intrinsic safety protection method

EX - zone Non EX - zone

EX certied Zenner barrier

Signal

Electrical data for

intrinsically safe specication

(for all MP-E types):

Pi max: 1 W Ui max: 30 V Ii max: 0.1 A Ci max: 0.5 nF Li max: 0.2 µH

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

Product marking

II3G

Ex ic IIB T6Gc

Safety requirements

The MP-E can be applied on systems with R1270 (propylene), R290 (propane), R600 (butane), R600a (isobutane) 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. Note, please follow specic selection criteria stated in the datasheet for these particular refrigerants.

2. The refrigeration system must always comply with European Ex installation standard, EN 60079-14, any local directive and legislation as well as any other regulation applying in the area of installation.

3. MP-E switch must be used only with reliable means of limiting the voltage and current to prevent

sparks between the contact surfaces. The equipment to be used for electrical load limiting must

always be approved for use in the zone concerned.

4. Cable and cable entries approved for the application must be used. Cables must not be in contact

with sharp edges. The cable must be connected with adequate stress relief in order to prevent that

pulling forces can be carried through the cable to the terminal.

5. In the event of pressure pulsations in the system, where the switch is connected, these must be

eectively damped to prevent fatigue failure on the bellows. The cycle frequency of the MP-E

switch must be kept as low as possible. The vibration level must be kept as low as possible.

6. It is recommended to regularly check the function of theMP-E switch.

7. 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 pressure

switches or the use of them against the instructions of Danfoss.

8. Any overload of the MP-E switch must be prevented. Overloaded or damaged apparatus must be

exchanged.

9. Only authorised persons, who are certied in installing and maintaining refrigration system may

do the installation, maintenance and exchange of the switch.

10. Use only appropriate tools.

11. Dispose of the switch in an environmentally-friendly way.

12. Components within the equipment can exceed the enclosure temperature by 1K (1 °C). When the

media temperature exceeds 80 °C, it is the responsibility of the user to ensure that the media temperature does not cause a thermal ignition risk on parts between the media and the switch enclosure thus it is recommended that maximum media temperature on pressure switch is limited to 80 °C.

13. Isolation of the intrinsically safe circuit to ground and to the contact mounting screw has been veried through 500VACrms dielectric strength testing, carried out in accordance with E N 6 0079-11:2012 . 14 . The max. applicable length of the cable connected to the MP-E depends on cable capacity and inductivity. Capacitance and inductivity of the cable together with Ci and Li of MP-E must t requirements of applied zener barrier.

Danfoss Electronics MP 55E Installation Guide

Specifications and Main Features

Frequently Asked Questions

User Manual