Introduction; Hazardous Area Safety Methods: Theory Of Operation; Division 1: X-Purge Protection - Daisy 9016 X-Purge User Manual

Model 9016 X-Purge Operator Interface

1 Introduction

Thank you for selecting a DAISY solution for your hazardous area operator interface
requirements!
This manual describes the general procedures for installing and operating DAISY Model
9016 X-Purge interface systems. The text portion of the manual also includes an overview of
the theory behind the methods used to make electronic systems safe for hazardous areas.
Section 9, Specifications, also contains an overview of system specifications, and Section 10
Drawings, includes mechanical drawings of each unit.

2 Hazardous Area Safety Methods: Theory of Operation

2.1 Division 1: X-Purge Protection

X-Purge systems are another option available for Division 1 hazardous areas. The
installation of an X-Purge system on an enclosure in a Division 1 area renders the area
within the enclosure to an essentially non-rated environment. Thus, normally rated
equipment may be installed within the enclosure (within reasonable limits, such as
complying with temperature and power restrictions).
An X-Purge system is fully automated. The system not only provides the protective
purge and maintains positive pressure, but it also automatically controls the
connection and disconnection of power supplies and signal paths. A well-designed X-
Purge system also automatically control flow rates, internal pressure regulation, purge
timing, and switching of states between purge flow and normal operation. DAISY X-
Purge controls provide all of these features.
X-Purge controls must also satisfy the FM 3620: 4.2 specifications. DAISY X-Purged
equipment has also been validated by Factory Mutual as meeting these requirements.
February 2022 5
Daisy Data Displays, Inc.
D010-000002