General Description; Operation; Installation And Startup - Sensor Electronics SEC 3100 Instruction And Operation Manual

II GENERAL DESCRIPTION
CONVENTIONS
The following conventions are used in this manual.
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Warning Statement
VDC (DC Voltage)
SEC 3100
The SEC 3100 transmitter is designed to be used with the SEC Millenium, SEC Signature infrared gas
sensors or SEC 3000 toxic gas detectors. The SEC 3100 is a microprocessor based intelligent transmitter
continuously monitoring information from the gas sensor. The LCD of the SEC 3100 displays the gas
concentration and sensor status. The SEC 3100 has one (1) "Alarm" LED and one (1) "Status" LED. The
SEC 3100 also has three (3) magnetic switches located around the circumference of the unit. This manual
will describe the operation and use of the SEC 3100 transmitter.
Features
• Explosion Proof
• Back lighted LCD Display
• Low Cost
• Plug and play toxic, oxygen and combustible gas sensors
• Self-check system
• 4-20 mA ouput
• RS-485 Interface (Isolated)
• Optional alarm and fault relays
• Non-intrusive programming
• Non-intrusive calibration
• Removable, non-volatile, time stamped data logging
• Optional IS barrier
• Digital communication link to SEC 3000 and SEC Millenium Gas Detectors
• Multi port housing for easy installation
III. OPERATION

Installation and Startup

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Warning: The user shall be made aware that if the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
The first step in the installation process is to establish a mounting location for the SEC 3100 transmitter and
gas sensor. Select a location that is typical of the atmosphere to be monitored or close to the anticipated
source of a dangerous gas.
It is very important that the SEC 3100 and gas sensor be properly located enabling it to provide maximum
protection. The most effective number and placement of sensors vary depending on the conditions of the
application. When determining where to locate gas sensors the following factors should be considered.
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What are the characteristics of the gas that is to be detected? Is it lighter or heavier than air? If it is
lighter than air the sensor should be placed above the potential gas leak. Place the sensor close to the
floor for gases that are heavier than air. Note that air currents can cause a gas that is heavier than air to