Dwyer Mark User Manual

Page 21

CAUTION: GENERAL
• Protection provided by the equipment may be impaired if the equipment is used in a manner not

specified by the manufacturer.

• Risk of electric shock - disconnect supply circuit before opening. Keep unit tightly closed while

circuits are alive.

• Suitable insulation between signal wiring and hazardous voltage wiring must be provided.

HAZARDOUS LOCATIONS, FLAMEPROOF
• Keep cover tightly closed when in operation.

• De-energize supply circuit before opening.
• To prevent ignition of hazardous locations, replace cover before energizing the electrical circuits.
• After de-energizing delay 3 minutes before opening.
• Do not open AS-interface equipped units when an explosive atmosphere may be present.

CAUTION

MARK 4 FLAME PROOF ENCLOSURE OPTION B & IE
• Repairs only to be conducted by Proximity Controls, A Division of Dwyer Instruments, Inc.

• Inspect thru shaft/bushing joint, of Mark 4, periodically for wear, if gap exceeds .0033˝ (.0 84 mm) for a length of 1˝
(25.4 mm) return to Proximity Controls, A Division of Dwyer Instruments, Inc. for repair or replace unit. The thread of the
cover with 4.000-16UN 2A/B must have a minimum of 7 threads engaged.

WARNING

HAZARDOUS LOCATIONS, INTRINSIC SAFETY
• Enclosure must be protected from mechanical friction and impact with iron/steel to prevent ignition

capable sparks.

CAUTION

Units without suffix B or IS are not Directive 94/9/EC (ATEX) Compliant. These units are not
intended or use in potentially hazardous atmospheres in the EU. These units may be CE marked

for other Directives of the EU.

NOTICE