EMERSON PM1 Aventics Electromechanical Pressure Switch ATEX Certified Instruction Manual

EMERSON PM1 Aventics Electromechanical Pressure Switch ATEX Certified

 About this documentation

These instructions contain important information for the safe and appropriate as-sembly and commissioning of the product.

• Read these instructions carefully, especially the section “Notes on Safety”, be-fore working with the product.

Additional documentation

1. Also follow the instructions for the other system components.
2. Furthermore, observe all general, statutory and other binding regulations.

Presentation of information

Warnings
In this documentation, there are warning notes before the steps whenever there is a risk of personal injury or damage to equipment. The measures described to avoid these hazards must be followed.

Structure of warnings

SIGNAL WORD
Hazard type and source Consequences of non-observance

• Precautions

Meaning of the signal words

• DANGER Immediate danger to the life and health of persons.
  Failure to observe these notices will result in serious health consequences, in-cluding death.

• CAUTION Possible dangerous situation.
  Failure to observe these notices may result in minor injuries or damage to property.

• NOTICE Possibility of damage to property or malfunction.
  Failure to observe these notices may result in damage to property or malfunctions, but not in personal injury

Symbols
Recommendation for the optimum use of our products.
Observe this information to ensure the smoothest possible operation.

Notes on safety

The product has been manufactured according to the accepted rules of current technology. Even so, there is a risk of injury or damage if the following general safety instructions and the specific warnings given in this instruction manual are not observed.

1. Keep these instructions in a location where they are accessible to all users at all times.
2. Always include the operating instructions when you pass the product on to third parties.

Intended use
The product may only be commissioned after it has been installed in the machine/system for which it is intended.

1. Only use the pressure switch to open and close electrical contacts using compressed air.
2. Only use compressed air as the medium.
3. Use is permitted only under the operating conditions and within the performance limits listed in the technical data.

Personnel qualifications
All tasks associated with the product require basic mechanical, pneumatic and electrical knowledge, as well as knowledge of the respective technical terms. In order to ensure operational safety, these tasks may only be carried out by qualified personnel or an instructed person under the direction of qualified personnel. Qualified personnel are those who can recognize possible dangers and institute the appropriate safety measures, due to their professional training, knowledge, and experience, as well as their understanding of the relevant regulations per-taining to the work to be done. Qualified personnel must observe the rules relevant to the subject area.

General safety instructions

• Observe the valid local regulations to protect the environment in the country of use and to avoid workplace accidents.
• Only use the product in safety-relevant applications if such use is expressly specified and permitted in the product documentation.
• Only use AVENTICS products that are in perfect working order.
• Examine the product for obvious defects, such as cracks in the housing or missing screws, caps, or seals.
• Do not modify or convert the product.
• The warranty will not apply if the product is incorrectly assembled.
• Product warnings and information must be legible, i.e. not covered by paint, etc.
• Only use the connection cable connected to the device and make sure that the connection cable is permanently installed.
• Never release the cable fitting on the device or connection cable.
• Make sure that the connection cable is protected against UV influences.

Safety instructions related to the product and technology

• Lay cables and lines so that they cannot be damaged and no one can trip over them.
• Do not assemble or operate the product in critical ambient conditions (e.g. high fluctuations in temperature) or in aggressive ambient air (e.g. solvent gases, salty air).
• When using the product, observe the environmental conditions in accordance with the IP protection requirements (IP65).

ATEX information on explosion protection
PM1-ATEX pressure switches are certified and labeled according to the enclosed declaration of conformity. They can be used as follows (see g Declaration of con-formity):

• In purely gas explosive areas of zone 2 (category 3G)
• In areas with flammable dust particles of zone 22 (category 3D)

DANGER
Danger of an ignition source due to impermissible operating conditions, connections, and parameters!
Operating the PM1 under impermissible conditions can lead to overheating on the surfaces of the PM1 and/or formation of an ignition source.

1. Observe the permissible operating conditions, in particular the ambient and medium temperatures.
2. Note the limited temperature range for ATEX conditions. Make sure that the values for the medium and ambient temperatures listed in the technical data (80°C) are complied with.
3. If temperatures of >+70 °C are reached, ensure that the cable is fixed.
4. Make sure that permitted temperature levels are not exceeded due to fluc-tuations in pressure.
5. Observe the relevant Ex guidelines for installation, maintenance, and re-pair, in particular EN 60079-17 as well as the prevailing national regulations (e.g. 89/391/EEC, article 7, paragraphs 5 and 8, IEC 60364 et seq.). This work must be performed by an electrical specialist.
6. When using the equipment in areas in zone 22 (dust 3D), protection stan-dards must also meet the requirements stated in EN 60079-31 (IP protec-tion class) or other measures must be implemented to prevent deposits of dust.

Scope of delivery

The scope of delivery includes:

• 1x electromechanical pressure switch PM1 with 3 m or 7 m cable
• 2x mounting screws, for flange version
• O-ring, for flange version
• Operating instructions

About This Product

Product description
The PM1 is used to open or close an electrical contact when a pre-set pressure range is reached.

Performance specifications
An appropriate medium is applied to the PM1 at the G1/4 connection or on the flange. A bellow actuates a microswitch (change-over switch) via a mechanism once the preset switching pressure is reached.  The contact switches (see g Fig. 5 and g Fig. 6)

• if the pressure increases from 1-2 to 1-3,
• if the pressure decreases from 1-3 to 1-2.
•  if the underpressure increases from 1-3 to 1-2, if the underpressure decreases from 1-2 to 1-3

Overview of PM1 pressure switch, ATEX certified

Pneumatic flange connection

1. O-ring ø 5×1.5 (included in scope of delivery)
2. Adjustment screw for fine adjust-ment, self-holding
3. Cylinder screw M5x30 ISO 1207 (2x); MA = 2.5+0.5 Nm (included in scope of delivery)

Pneumatic connection, internal thread G1/4

1. Connection G1/4, MA = 12+0.1 Nm
2. Adjustment screw for fine adjust- ment, self-holding
   For material numbers, please refer to the online catalog.

Product identification

Observe the product information on the product and packaging. The ATEX information can be found on the back of the product.

Identification on the name plate

1. Internal factory designation
2. Country of manufacture
3. EAC mark
4. Specialist marking
5. CE mark
6. Material number
7. Operating pressure range
8. Max. permissible voltage
9. Max. current consumption
10. Max. power consumption
11. Serial number
12. Manufacturer’s address
13. Date code*
14. Customer-specific switching pressure
15. Wiring diagram
16. Manufacturer logo

The first four digits of the 7-digit date code show the year and the last two show the week.

Assembly

Let the product acclimatize for several hours before commissioning, other- wise, water may condense in the housing.

CAUTION Danger of injury if assembled under pressure or voltage!
Assembling when under pressure or electrical voltage can lead to injuries and damage to the product or system components.

1. Make sure that the relevant system component is without pressure and voltage before you assemble the product.
2. Protect the system against being restarted.

Assembling the pressure switch and connecting the pneumatics

1. Make sure that the system is not under voltage or pressure.
2. Connect the pressure switch with the pressure system:
   • Flange connection M5: MA = 2.5+0.5 Nm (see g Fig. 1)
   • Connection G1/4: MA = 12+1 Nm (see g Fig. 2)

Electrically connecting the pressure switch
Wire identification corresponds with the contact assignment of the following fig-ure.

The installation of electrical devices must be carried out in accordance with appli-cable national regulations and performed or supervised by an electrical specialist (in compliance with TRBS 1203 or equivalent).

Commissioning and operation

DANGER
Danger of explosion!
There is a danger of ignition in explosive areas if the product is not commis- sioned properly.

• Observe the warnings under g 2.5. ATEX information on explosion protec-tion!

CAUTION Risk of injury due to uncontrolled actuator movements when the pneumat-ics are switched on!
There is a danger of personal injury if the system is in an undefined state.

• Put the system in a defined state before switching it on.

CAUTION
System is operating under pressure!
Incorrect installation could damage the pressure switch or the system and cause serious injury.

• Before commissioning, check that all connections, ports and components have been correctly installed.

Commissioning the pressure switch

Proceed as follows to commission the pressure switch:

1. Check whether the pressure switch is assembled correctly (see g 5. Assembly and g 2. Notes on safety, especially g 2.5. ATEX information on explosion protection) and make sure that all pressure switch connections are properly connected.
2. Secure the components to be switched to prevent unintentional responses, and apply voltage.
3. Apply the compressed air to the system.
4. Check that the switch outputs are functioning properly.

Setting the switching point

1. Adjustment screw

• Factory setting: pressure switch = 3 bar; vacuum switch = –0.4 bar

• The adjustment screw is self-holding.
  The switching point is continuously adjustable, even during operation.

  • To check the switching point, an external pressure gauge must be used. To set the switching point to a higher pressure:

  • Turn the adjustment screw (1) to the right (+).
    To set the switching point to a lower pressure:

  • Turn the adjustment screw (1) to the left (–).

Service and repairs

Cleaning and servicing

DANGER
Danger of explosion due to electrostatic charge!
Cleaning with a dry cloth may cause the surface of the pressure switch to be- come electrostatically charged. This can lead to an explosion in explosive ar- eas.

• Use only a water-moistened cloth to clean the pressure switch! Never use solvents or aggressive detergents.
• Do not use high-pressure cleaners for cleaning.

Maintenance
The pressure switch is maintenance-free.

• Contact the AVENTICS service department in case of technical problems.

Disassembly and exchange

CAUTION
Danger of explosion!
Disassembly and exchange when under pressure or voltage can lead to explo- sions in explosive areas.

1. Make sure that the relevant system component is without pressure and voltage before you assemble the product.
2. Protect the system against being restarted.
3. Make sure that the system is not under voltage or pressure.
4. Disconnect the electrical connection.
5. Loosen the mounting screws on the pressure switch.
6.  Remove the pressure switch from the pressure system.

Disposal

Dispose of the product in accordance with the currently applicable regula- tions in your country.

Troubleshooting

Response to malfunctions

• If malfunctions occur with unknown causes, exchange the pressure switch with an original pressure switch.
  The individual components of the pressure switch cannot be replaced or repaired.

If you cannot remedy a malfunction, please contact one of the addresses, see the back of the instructions.

Technical data

General

•   Max. particle size: 40 µm

•   Pressure dew point ≤ 3°C

•   Oil content: max. 40 mg/m3

The pressure dew point must be at least 15°C below the ambient and medium temperatures and must not exceed 3°C.

The oil content of compressed air must remain constant during the service life.

u Use only the approved oils from AVENTICS.

Switching pressure range| •   –0.9 bar to 1 bar (see g Fig. 8)

•   0.2 bar to 16 bar (min. switching pressure range 0.2 bar fall- ing/0.5 bar rising) (see g Fig. 9)

Max. switching fre- quency| 1.6 Hz
Electronics|
Min./max. operating voltage

Further tech

| 12 V–125 V DC

12 V–250 V AC

nical data can be found in our online catalog.

Switching capacity

Standards and directives complied with

EN IEC 60079-0:2018| Explosive atmospheres – Part 0: Equipment – General requirements
EN IEC 60079-15:2019| Explosive atmospheres – Part 15: Equipment protection via type of ignition protection “n”
EN 60079-31:2014| Explosive atmospheres – Part 31: Equipment – Protection against dust explo- sion with housing “t”

Reference cycle 30/min. reference temperature: +30°C, U = 30 V
Inductive load: AC = cos ~ 0.7°; DC = L/R ~ 10 ms

Differential switching pressure characteristic curve

1. Rising
2. Falling
   • p1 (+) Upper switching pressure with increasing pressure
   • p1 (-) Lower switching pressure with decreasing pressure

• A) p1 (-) Min.
• B) p1 (-) Max.
• p1 (+) Upper switching pressure with increasing pressure
• p1 (-) Lower switching pressure with decreasing pressure
• Δ p1 Max. switching pressure difference or hysteresis

Example:

• p1 (+) = 8 bar > p1(-) = 7.6 bar
• Δ p1 = 0.4 bar

References

• AVENTICS – Smart, reliable solutions for pneumatic automation | Emerson US
• Contact Us | Emerson US
• Contact Us | Emerson US

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