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P/N: 18122 Page 1 Rev. 1.0
Rev Date: 9/7/07
S-2A
Propane / CNG Fume Detector with Solenoid Valve Control
Installation and Operation Manual
MADE IN THE USA.
• Automatic Solenoid Control
• Dual Sensor Capability
• Microcomputer Operation
• Solid State Sensors
• Self Testing Circuitry
READ THIS MANUAL CAREFULLY AND
SAVE FOR FUTURE REFERENCE. KEEP
THIS MANUAL WITH THE S-2A.
Introduction
The S-2A vapor-monitoring system utilizes advanced technology for detection of propane (LPG)
fuel vapors as well as CNG (Compressed Natural Gas). The S-2A allows the connection of two
(2) sensors and has both visual and audible alarms. Test switches are provided for full checking
of all operations. System operation and correct sensor operation are continually monitored and
indicators are provided for fault detection. The S-2A has an internal relay for automatic control of
fuel solenoid. Read this owner’s manual completely before installation. Failure to read and follow
these instructions can result in damage to the unit voiding the warranty.
Components This Kit Includes
• One S-2A Display w/Bezel • Four screws for the display
• One SV-1 Solenoid Valve • Two screws for the sensor
• One 20 MS-2 Sensor
CAUTION: NO POWER ON/OFF SWITCH IS PROVIDED FOR THIS UNIT. TO
FUNCTION AS INTENDED, THE S-2A MUST BE CONNECTED TO A CORRECT
POWER SOURCE, AND FOR MAXIMUM EFFECTIVENESS, BE POWERED AT
ALL TIMES WHILE ABOARD. IF POWER IS ON AND LEFT UNATTENDED FOR AN
EXTENDED PERIOD OF TIME, BATTERY POWER MAY BE DIMINISHED.