SPECIAL CONDITIONS FOR SAFE USE
Honeywell explosion-proof switches are designed specifically
for use in hazardous location applications. The BX enclosure is
sealed for protection against corrosion, water, dust and oil as
defined in IEC60529. The temperature rating for these products
depends upon the seal material used. Products using a fluoro-
silicone seal have a rating of -40 °C [-40 °F] to 70 °C [158 °F].
Products using a fluorocarbon seal have a rating of -12 °C [10 °F]
to 70 °C [158 °F]. These enclosures meet Ex d IIC T6, Ta -40 °C
to 70 °C and Ta -12 °C to 70 °C, respectively. As well as Ex d tD
A21 IP67 T85 °C. SIRA 00ATEX1037X and IEC Ex SIR 07.0102X.
Compliance with the Essential Health and Safety Requirements
has been assured by compliance with EN 60079-0:2006, EN
60079-1:2007, EN 61241-0:2004, EN 61241-0:2006, IEC 60079-
0:2004 4th Ed., IEC 60079-0:2007 6th Ed., IEC 61241-0:2004 1st
Ed., and IEC 61241-1:2004 1st Ed. The maximum contruction
gap (ic) is less than that required by Table 2 of EN/IEC60079-
1:2007, clause 5.2.2 as detailed below.
Flame path
Max. gap
Comment
Push rod & bearing 0,076 mm
Cylindrical spigot joint
BX with conduit types 1/2-14NPT, 3/4-14NPT also meet the North
American Hazardous Locations Designation: NEMA 7 - Class I,
Groups B, C and D; NEMA 9 - Class II, Groups E, F and G and
comply with UL Standard: UL 894, CSA Standard: C22.2 No. 25-
1966, C22.2 No. 30-M1986.
The BX is ideal for outdoor use or in adverse environments where
a combination of explosion-proof plus sealing requirements are
needed. To comply with explosion proof requirements the BX
has flame paths within the housing, which cool exploding gases
below the ignition temperature before they reach explosive gases
surrounding the housing. Flame paths on the BX are (1) an ex-
tended plunger between the switch cavity and head and (2) the
cover-housing threads on the front of the switch.
WARNING
PERSONAL INJURY
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.
WARNING
OPENING PRODUCTS HAZARD
DO NOT OPEN these products when energized or in a
flammable gas atmosphere.
Failure to comply with these instructions could result in
death or serious injury.
WARNING
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.
WARNING
During installation, suitable certified cable entry and closing
device approved by Explosion Test Lab with Ex marking “Ex IIC”
shall be used and correctly installed. The conduit size should be
G1/2”, G3/4”, M20, PG13.5, or PF1/2”. Cable entry for redundan-
cy use should be well and effectively blocked by closing device.
Installation Instructions for the
MICRO SWITCH™ BX Series
Explosion-proof Limit Switches
MOUNT, ADJUST, WIRE
MOUNTING
Note mounting dimension drawings for hole locations (Fig. 9,
page 3). The BX is directly interchangeable with the LSX explo-
sion-proof limit switches: Adapter plate is not required.
ADJUSTING INSTRUCTIONS
To give flexibility in application, the user can perform the adjust-
ments described below in any order before wiring the unit.
Sensing and Control
Issue 10
PK 80148
0518
II2GD