Model 9017 Y/Z-Purge Operator Interface
Daisy Data Displays, Inc.
February 2022
12
D011-000002
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.
7.1.4
Model 9121 Connections
MODEL 9121 RELAY KIT INSTALLATION NOTE
The Model 9121 Relay Panel MUST BE
INSTALLED OUTSIDE THE HAZARDOUS AREA
.
MODEL 9121 CANNOT BE INSTALLED IN THE HAZARDOUS AREA!
MODEL 9121 RELAY
KIT/PANEL
Summary of Contents for 9017
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