ENMET OMNI-4000 - Manual (Page 10)

ENMET Corporation OMNI-4000 S/N 6705 and above
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1.0 General Description
O VERVIEW : In this section the OMNI-4000 and its components are described by means of a number of diagrams.
The OMNI-4000: The OMNI-4000 is a portable multi-gas detector. It can simultaneously detect the presence of up to
four gases by means of special sensors for each type of gas to be detected. Included are explosive gases (methane, propane,
butane, etc.), toxic gases (carbon monoxide, hydrogen sulfide, chlorine, etc.), and the oxygen content of the air.
1.1 General Characteristics
These are presented below. Complete specifications and sensor characteristics are presented in Section 4.
• Simultaneous detection of up to 4 gases
• Interchangeable factory-set sensors
• Automatic switchover between "explosive gas %" and "volume %" scales, optional
• Storage of events
• Instantaneous STEL and TWA alarms
• RS232C port for direct connection to a serial printer or compatible personal computer
• Intrinsic Safety Approval
1.2 Main Components
These are those operated by the user. They are shown in Figures 1-1, 1-2, and 1-3. A detailed description of each main
component is given in the next chapter.
O PERATION OF THE DEVICE
The OMNI-4000 is a gas detector which can be used with up to four sensors, each one for a different type of gas. Thus,
depending on the number and type of sensors installed, the OMNI-4000 detects the presence of the corresponding gases in
the immediate environment. Sensors can be easily removed and replaced by other available sensors for different gases.
When fitted with a pump system and a calibration cover, the OMNI-4000 can be used to measure the concentrations of
gases in difficult-to-reach areas or before entry into confined spaces.
When the instrument is on and not in alarm, a confidence beep is emitted and the general alarm indicator light blinks every
30 seconds, showing that the device is operating correctly. The OMNI-4000 has received intrinsic safety approval for the
European equivalent of Class 1, Div. I, Groups A, B, C and D hazardous areas.
1.3 Operating the OMNI-4000: In the Field
Control is by means of the four touch-sensitive switches on the front panel. See Figure 1-3 in which these switches are
named. These switches are used:
• To turn the device on and off
• To acknowledge the gas audio alarm
• To turn on the backlighting system for the LCD display, which automatically turns off after approximately 15 seconds
• To select the menus during operation
1.4 Programming
Access for programming is obtained by inserting the programming plug into the appropriate socket or after opening
the instrument. The same touch sensitive switches on the OMNI-4000, shown in Figure 1-3, then enable:
• The device to be turned on and off
• The programming choice to be entered
• Scrolling in a menu
• The selection of a menu