m PERSONAL INJURY WARNING
DO NOT USE these products as safety or emergency stop
devices or in any other application where failure of the
product could result in personal injury.
Failure to comply with these instructions could result in
death or serious injury.
mWARNING
OPENING PRODUCTS HAZARD
DO NOT USE these products when energized or in a
flammable gas atmosphere.
Failure to comply with these instructions could result in
death or serious injury.
mWARNING
IMPROPER CONDUIT THREAD USE
DO NOT USE any other conduit thread than the one
identified on the product. Verify that the mating threaded
fitting is identical with the conduit thread shown on the
product nameplate.
Failure to comply with these instructions could result in
death or serious injury.
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.
mDANGER
EMISSION OF HOT PARTICLES
Joint surfaces must be thoroughly cleaned before closing.
Failure to comply with these instructions could result in
death or serious injury.
IMPORTANT: All EX series products comply with UL Standard:
UL 894 and UL 1203, CSA Standard: C22.2 no. 251966, C22.2
no. 30M1986. EX series products also meet NEMA 1 enclosure
requirements.
Select EX and EXHT Series products also meet the European
Hazardous Locations Designation: Ex db +H2 T6 Gb (FOR EX
SERIES) and Ex db +H2 T2 Gb (FOR EXHT SERIES) 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 EN600790 and EN600791. 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 Series
Ex db IIB+H2 T6 Gb
40 °C < Tamb +70 °C
EXHT Series
Ex db 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 600790
ABNT NBR IEC 600791
ABNT NBR IEC 60529
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: Ex db 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
KEM 08.0027X) for Ex db IIB + H2 T6 or T2 Gb environments
and are compliant with IEC 600790 and IEC 600791.
2813
INSTALLATION INSTRUCTIONS FOR THE
MICRO SWITCH EX SERIES,
EXPLOSION-PROOF LIMIT SWITCHES
50009662
Issue 11
2 sensing.honeywell.com
MICRO SWITCH HAZARDOUS LOCATION SWITCH, EX SERIES
Issue 11
50009662
NOTICE
ATEX INSTALLATION INSTRUCTIONS
Cable connection
The cable entry device shall be certified in type of protection
flameproof enclosure “d”, suitable for the conditions of use
and correctly installed.
For ambient temperatures above 60 °C [140 °F], cables and
cable glands suitable for a temperature of at least 80 °C
[176 °F] are required.
Conduit connection
A certified sealing device in type of protection flameproof
enclosure “d”, such as a conduit seal with setting compound
shall be provided immediately to the entrance of the
enclosure.
For ambient temperatures over 60 °C [140 °F], suitable heat
resistant wiring and setting compound in conduit seal shall
be used.
Blanking elements of unused apertures shall be certified in
type of protection flameproof enclosure “d”, suitable for the
conditions of use and correctly installed
SPECIAL CONDITIONS FOR SAFE USE
1. For information regarding the dimensions of the
flameproof joints, the manufacturer shall be contacted.
2. The special fasteners shall have a yield stress minimum of
372 MPa.
INSTALLING THE SWITCH
A mounting bracket (15PA85EX) 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 15PA86EX 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 1032 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 EXAR20 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.
NOTICE FOR ATEX APPLICATIONS
As ambient temperature approaches 60 °C [140 °F], cable
entry can be 70 °C [158 °F] or higher and cable branching
can be 80 °C [176 °F] or higher, making it important to
select cable that meets these requirements.
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).