GAI-Tronics DEX-101 User Manual
Pub. 42004-679L2G
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model DEX-101, -102, -201, and -202
Hazardous Area Driller’s Intercom Stations
T ABLE OF C ONTENTS
Confidentiality Notice .....................................................................................................................1
General Information .......................................................................................................................1
Product Overview ................................................................................................................................... 1
System Requirements and Limitations ................................................................................................. 1
Features and Functions .......................................................................................................................... 2
Available Models ..................................................................................................................................... 2
Description of Major Components ........................................................................................................ 2
Installation ......................................................................................................................................3
General Information ............................................................................................................................... 3
Mounting .................................................................................................................................................. 5
Conduit Installation ................................................................................................................................ 5
Field Wire Installation ............................................................................................................................ 6
Power ........................................................................................................................................................ 7
AC Models ............................................................................................................................................................ 7
DC Models ............................................................................................................................................................ 7
Auxiliary Devices .................................................................................................................................... 8
System Interconnection .......................................................................................................................... 9
Operation .......................................................................................................................................10
Digital Models DEX-102 and DEX-202 ............................................................................................ ... 10
Intercom Communication Modes ........................................................................................................................ 10
Volume Control .................................................................................................................................................. 10
Paging ................................................................................................................................................................. 11
Alarms and Music ............................................................................................................................................... 11
Analog Models DEX-101 and DEX-201 .............................................................................................. 11
Intercom Communication Modes ........................................................................................................................ 11
Volume Control .................................................................................................................................................. 11
Paging ................................................................................................................................................................. 11
Alarms and Music ............................................................................................................................................... 11
Maintenance ..................................................................................................................................12
General Information ............................................................................................................................. 12
Troubleshooting .................................................................................................................................... 12
Specifications ................................................................................................................................13
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
V
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Pub. 42004-679L2G
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model DEX-101, -102, -201, and -202
Hazardous Area Driller’s Intercom Stations
Confidential ity Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics. GAITronics retains all intellectual property and other rights in or to the information contained herein, and
such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
Product Overview
The Driller’s Intercom is a communications system
designed to serve the needs of oil and gas industry on
oil drilling platforms, especially in hazardous areas. It
provides all-call, group call, and point to point
communications, and is available in digital and analog
versions.
The enclosure is rated NEMA-4X, and is factory sealed
to ensure explosion-proof integrity.
System Requirements and Limitations
Each Driller’s Intercom system requires a Central
Switch to operate. The Central Switch must be located
in a non-hazardous area. The configuration parameters
for all components of the system are set in the Central
configuration.
Each central switch can manage up to 16 digital or analog subscribers, and can be expanded to 32
subscribers. Central switches can be linked or a larger switch can be used for increased system size. By
combining central switches, the system is easily expanded at any time.
All stations must be connected in a star configuration to the Central Switch, but power to the stations can
be daisy-chained. Please refer to the “Installation” section for the power cable and system cable distance
limitations.
Additional features and functions (not detailed in this manual) are available. Refer to the Central Switch
manual or contact a GAI-Tronics Corporation representative for more details.
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
V
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Figure 1. Driller’s Intercom with Keypad
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Features and Functions
Digital and analog models Factory sealed
120–240 V ac and 24 V dc models Suitable for Div. 1 & 2 and Zone 1 & 2 Hazardous Areas
NEMA-4X rated enclosure Suitable for high noise areas
18-watt speaker amplifier Hands-free duplex and simplex communication
Speaker volume control All-call and group paging
Beacon control (digital models only) Broadcast of alarm and music signals
Footswitch input Master/slave and point-to-point communications
Call status indicator System upgrade and expansion capability
UL Approved
Available Models
DEX-101
DEX-201
DEX-102
DEX-202
Analog Intercom Station - 24 V dc (UL)
Analog Intercom Station - 120 V ac (UL)
Digital Intercom Station with keypad - 24 V dc (UL)
Digital Intercom Station with keypad - 120 V ac (UL)
Description of Major Components
The Driller’s Intercom stations consist of a factory-sealed enclosure (top) and a termination enclosure
(bottom). Refer to Figure 1 for details. The factory-sealed configuration eliminates the need for external
seals on this unit; however, additional seals may be required on auxiliary devices.
The audio, control, and power components for this assembly are contained in the factory-sealed
enclosure. The front panel of the factory-sealed enclosure contains the user interface components
(microphone, status LED, and keypad [digital models only]).
All system terminations (power, speaker, system, footswitch, and beacon) are to be made in the
termination enclosure.
This station requires an external speaker (sold separately) to operate. Also, a customer-supplied beacon
(digital models only) and footswitch can be added to this unit for visual status indication and talk/listen
control.
CAUTION
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Use only suitably listed components for the hazardous area.
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Installation
General Information
WARNING
Always remove power to this station and any associated equipment before
beginning any installation.
Install equipment without modification and according to all applicable local and national electrical codes.
Consult the National Electrical Code (NFPA 70), Canadian Standards Association (CSA 22.1), and local
codes for specific requirements regarding your installation. Class 2 circuit wiring must be performed in
accordance with NEC 725.55.
CAUTION
The factory-sealed section of this station is only to be opened for maintenance or repair by factory
authorized personnel. Refer to the “Maintenance” section for more details.
WARNING
After installing station and before applying power, verify that the bolts on the factory-sealed section
of the station are set at 30 ft-lbs.
This station has a highly sensitive microphone that allows the user to communicate at a distance from the
station. This station also contains a high gain amplifier that enables operation in high noise
environments.
To prevent feedback problems in the system, the ambient noise levels, volume settings, and station
placement must be taken into consideration. In most cases, stations can be mounted perpendicular to the
same surface and be placed 150 feet apart. This minimum spacing requirement between stations can be
reduced under the following conditions:
Stations are installed in a high noise environment;
Stations are configured for simplex mode (depressing T button);
Stations contain speaker L-pads;
Stations are placed in separate rooms.
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Figure 2. Driller’s Intercom Outline
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