Danfoss MP 55E Pressure Switch

Refrigerants

R1270, R290, R600, R600a
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.

Installation

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 insufficient 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 classified in different zones, for different parts of the system.ed

Intrinsic safety protection method

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

Safety requirements

1. The MP-E can be applied on systems with R1270 (propylene), R290 (propane), R600 (butane),  R600a (isobutane) as the working fluid.
   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 flammable refrigerant.
   Note, please follow specific 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 effectively 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 persons, who are certified in installing and maintaining  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 1 K (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 verified through 500 VACrms dielectric strength testing, carried out in accordance with EN 60079-11:2012.
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 fit requirements of applied zener barrier.

UK DECLARATION OF CONFORMITY

DanfossA/S
Refrigeration & Air Conditioning Controls  declares under our sole responsibility that the.
Product category: Pressure switches

Type designation(s): MPE
Covered by this declaration is in conformity with the following directive(s). standard(s) or other normative document(s), provided that the product is used in accordance with our instructions.
Equipment and Protective Systems Intended for use in Potentially Explosive Atmospheres Regulations 2016 Marking::

Test basis:

BS EN IEC 60079-0:2018 Explosive atmospheres, Part 0, Equipment-General requiremenls
BS EN 60079-11:2012 Explosive atmospheres, Part 11, Equipment Protection by Intrinsic safely
Danfoss only vouches for the correctness of the English version of this declaration. In the event of the declaration being translated nto any other language, the translator concerned shall be liable for the correctness of the translation

Documents / Resources

Danfoss MP 55E Pressure Switch [pdf] Installation Guide 060R9517, 089, MP 55E Pressure Switch, MP 55E, Pressure Switch, Switch

References

• User Manual