Y/Z-Purge Ext. Relay Kit Model 9121; Purge Types; General Y/Z-Purge Operation; Model 9121 Relay Kit Functionality - Daisy 9017 User Manual

Model 9017 Y/Z-Purge Operator Interface

7.1 Y/Z-Purge Ext. Relay Kit Model 9121

The Model 9121 External Relay Kit is designed to be incorporated into Daisy Data Y-
or Z-Purge Systems to provide an automated means to remove power to protected
components upon the loss of pressure within the cabinet.

7.1.1 Purge Types

• Type Y Purge System - Allows for the use of non-incendive components within the
cabinet of a Class 1, Division 1 environment.
• Type Z Purge System - Allows for the use of unclassified components within the
cabinet of a Class 1, Division 2 environment.

7.1.2 General Y/Z-Purge Operation

During normal operation in the event of a loss of pressure within the enclosure, the
alarm system will indicate a failure. The operator must then manually shut off power
and signal connections at a safe disconnect location.

7.1.3 Model 9121 Relay Kit Functionality

Once installed, the relay will provide an automated shutdown, or powering-off, of
the protected components within the cabinet.
This DOES NOT turn the Y/Z-Purge into an X-Purge. It is used to reduce the risk of
ignition if there is a loss of positive pressure by powering off a majority of the
electronics within the purged cabinet. This does not include the alarm circuit,
therefore does not entirely eliminate the risk.
The Model 9121 Relay Panel MUST BE INSTALLED OUTSIDE THE HAZARDOUS AREA.

7.1.4 Model 9121 Connections

February 2022
MODEL 9121 RELAY KIT INSTALLATION NOTE
MODEL 9121 CANNOT BE INSTALLED IN THE HAZARDOUS AREA!
MODEL 9121 RELAY
KIT/PANEL
12
Daisy Data Displays, Inc.
D011-000002