Honeywell MICRO SWITCH EX Series Explosion-proof Limit Switches Installation Guide

MICRO SWITCH EX Series Explosion-proof Limit Switches

Series

Explosion-proof Limit Switches

  

2813

GENERAL INFORMATION

The flame paths of Honeywell’s MICRO SWITCH EX explosion proof switches cool exploding gases below the ignition  temperature before they reach explosive gases surrounding  the housing. The enclosed basic switch is accessible when the  cover is removed. EX series products are NEMA 1 rated and  therefore are not recommended for use in areas when they will  be subjected to liquid splash.

EX series products are listed by Underwriters’ Laboratories and  CSA for use in hazardous locations NEMA 7, Class I, Groups C &  D, and NEMA 9, Class II, Group E, F, and G. This includes vapors  

of ethyl ether, gasoline, petroleum, alcohol, acetone, lacquer  solvent, natural gas, and atmospheres charged with grain dust,  metal dust, carbon black, coal, or coke dust. Select EX listings  are also listed for Class I, Group B (hydrogen) atmospheres.

Issue 11 50009662

IMPORTANT:  All EX series products comply with UL Standard:  UL 894 and UL 1203, CSA Standard: C22.2 no. 25-1966, C22.2  no. 30-M1986. EX series products also meet NEMA 1 enclosure  requirements.

Select EX Series products also meet the European Hazardous  Locations Designation: Exd IIB + H2 T6 Gb category II 2 G,  KEMA 04ATEX2312X and complies with the European Directive  on Equipment and Protective Systems Intended for Use in  Potentially Explosive Atmospheres (2014/34/EU) commonly  referred to as the ATEX Directive. Compliance with the  Essential Health and Safety Requirements has been assured by  compliance with EN60079-0:2009 and EN60079-1:2007. EX  series products have an ATEX temperature range of –40 °C to  70 °C [–40 °F to 158 °F], and when used within the maximum  voltage and current specified on the product will have no  heating problems.

EX AND EXHT Series products also meet the Brazilian  hazardous locations designation:  

Ex d IIB+H2 T6 Gb

-40 °C < Tamb +70 °C

Ex d IIB+H2 T2 Gb

-40 °C < Tamb +204 °C

and comply with INMETRO requirements.

Compliance with Essential Health and Safety Requirements  has been assured by compliance with  

ABNT NBR IEC 60079-0:2008

ABNT NBR IEC 60079-1:2009

ABNT NBR IEC 60529:2011

Please refer to certificate number TÜV 14.0554 X for conditions  of safe use.

The EXHT Series products have an ATEX temperature range  of -40 °C to 204 °C [-40 °F to 400 °F] and meet the European  Hazard Locations Designation: Exd IIB + H2 T2 Gb category  II 2 G. Select EX and EXHT Series products also meet the IEC  Scheme for Explosive Atmospheres IEC Ex Certification (IEC Ex  

MICRO SWITCH EX Series  ISSUE 11  50009662  MICRO SWITCH EX Series  ISSUE 11  50009662  

KEM 08.0027X) for Ex d IIB + H2 T6 or T2 Gb environments and  are compliant with IEC 60079-0:2007 and IEC 60079-1:2007.  

I NSTALLING THE SWITCH

A mounting bracket (15PA85-EX) is furnished at no extra cost  with most EX switches. This permits all rotary operated switches  to be mounted from top, bottom, back or right end. Plunger  switches may be mounted on back, bottom or right end with  this standard bracket. For top mounting of plunger switches,  bracket 15PA86-EX must be purchased separately. The double  conduit switch also has an auxiliary bracket (included) which  permits two-hole mounting from top, back or bottom. Direct  mounting is by means of two 10-32 NF tapped holes on the  top, back or bottom. Any mounting bracket that does not  interfere with the explosion-proof protection of the enclosure  can be used on these products.

15PA85-EX

Fasten bracket to switch with screws furnished. Bracket may be  secured to mounting surface with 0.250 inch machine screws.

15PA86-EX

Fasten bracket to top of switch with screws furnished. Bracket  

may be secured to mounting surface with 0.250 inch machine screws.

Note: Catalog listing EX-AR20 can be mounted using  Honeywell system sensor bracket OSYEXP or PIBVEXP without  interfering with the explosion-proof protection of the enclosure.

ELECTRICAL RATINGS

Electrical ratings of EX switches depend on the type of basic  switch enclosed in the housing. Ratings are shown on page  4 along with letter keys (A, B, C, D, E, F, G) shown in table of  listings on page 4.

WIRING INSTRUCTION

Use up to size #14 AWG solid or stranded wires to connect to  the pressure-type connector terminals. Use green wires for  ground leads, red wires for NC leads, blue wires for NO leads,  and black for common leads.

ADJUSTING THE ROLLER ARMS

The roller lever assembly is adjustable through 360° at any of  1,980 positive lock positions at intervals of approximately 0.2°.

To adjust the roller lever to the desired position, hold the  hexagon washer with a wrench and loosen lock nut sufficiently  to disengage the serrations. Hold shaft in position by means  of the hexagon washer so that no torque will be applied to  the internal parts of the unit when the lock nut is tightened or  loosened. Failure to do so may result in damage to the enclosed  switching mechanism.

Moving lever one serration forward or backward with respect to  serrations on fluted washer changes the position of the lever  approximately 8.2° (see sketch at end of section).

Moving lever and fluted washer, as a unit, one serration forward  or backward with respect to serrations on the hexagon washer  changes position of the lever 8°. Moving the lever one serration  in one direction, and the lever and fluted washer, as a unit, one  serration in the other direction, changes position of the arm  approximately 0.2°.

After positioning lever arm, tighten lock nut sufficiently to  prevent slippage of arm, but avoid over tightening.

MOUNTING DIMENSIONS

Roller Arm – Single Conduit

Roller Arm – Double Conduit

NOTE: The yield stress of bolts to fasten the enclosure together  is according to drawing, EX SERIES CHART 1.

Straight Plunger One-way Roller Arm Low Force Rod

STRAIGHT PLUNGER ACTUATION  Do not actuate by cams or slides  or by any other device which  will impart side thrust to the plunger. Use straight “push” action  in the direction of the plunger motion. Do not oil this plunger  mechanism. Sufficient grease of the proper type is assembled  in the plunger during manufacture to last the lifetime of the  switch. Additional grease, oil, water or fine abrasive may cause  jamming or electrical failure.

2  sps.honeywell.com/ast Advanced Sensing Technologies  3

MICRO SWITCH EX Series  ISSUE 11  50009662  MICRO SWITCH EX Series  ISSUE 11  50009662  

REPLACING BASIC SWITCH

1. Observe this notice:

2. Remove cover of housing, disconnect the lead-in wires,  loosen screws holding the basic switch, then remove the  basic switch.

3. Place replacement switch in the insulator, insert the  screws, and place basic switch in the housing.  

4. Tighten the screws and connect the lead-in wires.

5. Be sure small compression spring is returned to its position  between the top of the basic switch and the internal lever  (or above internal lever in the case of the CCW actuated  switches).

ELECTRICAL RATINGS

A  UL and CSA listed: L96

15 amps, 125, 250 or 480 Vac;

1/8 Hp, 125 Vac; 1/4 Hp, 250 Vac;

1/2 amp, 125 Vdc; 1/4 amp,

250 Vdc

B  UL and CSA listed: L23

20 amps, 125, 250 or 480 Vac;

10 amps, 125 Vac “L”; 1 Hp,

125 VAC, 2 Hp, 250 VAC; 1/2 amp,

125 VDC; 1/4 amp, 250 Vdc

C  UL and CSA listed: L59

10 amps, 125 or 250 VAC; 0.3 amp,

125 Vdc; 0.15 amp, 250 Vdc

D  UL and CSA listed: L9

10 amps, 125, 250 or 480 Vac;

1/2 amp, 125 Vdc; 1/4 amp,

250 Vdc

E  UL listed: L22

1 amp, 125 Vac

F  UL and CSA listed: L110

3 amps, 125 or 250 VAC

1/10 HP, 125 Vac; 1/16 HP, 250 Vac

G  UL and CSA listed: L35

5 amps, 125, 250 or 480 Vac;

1/2 amp, 125 Vdc; 1/4 amp 250 Vdc

ATEX TEMPERATURE RATINGS

T2 EXHT Series T6 EX Series

A ground screw is provided for convenient grounding.