ENMET OMNI-4000 - Manual (Page 16)

ENMET Corporation OMNI-4000 S/N 6705 and above
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1.7.3 Acknowledging Alarms
Acknowledging Gas Alarms
• This means canceling only the audio alarm, not the entire gas alarm. When a channel is in alarm and the ENTER
switch shown in Fig. 1-11 is pressed, the audio alarm stops, but the both the general and channel alarm lamps
continue blinking until the reading is below the programmed alarm threshold level. As soon as the reading is within
the preset limits, the alarm lamps automatically go out. This applies equally for the instantaneous alarms and the
TWA and STEL alarms.
Acknowledging Fault Alarms
• A fault alarm can be acknowledged only after the fault has been cleared from the channel.
1.8 Memorization of Readings-Histograms
The OMNI-4000 can store the readings taken for later printout or display on a computer screen, in the form of
histograms. See Figure 1-12.
The histogram function enables the printout and/or display on a personal computer or work-station of the readings and
events stored in the OMNI-4000 during the period of operation.
Clearing the memory can only be performed during the printout procedure. The OMNI-4000 can be turned off
without affecting the data stored in it.
Operating Principles
In order to make maximum use of the data printed out as charts, the principles underlying the memorization of data are
described below.
1.9 Data Stored
The OMNI-4000 stores groups of data as soon as it is switched on and then cyclically. Each of these groups has the
same structure and content:
• The average reading of concentrations for each enabled sensor over a period of one minute, at a rate of one sampling
operation per second
• The events on each channel:
] Resetting
] Faults
] Instantaneous and average alarms
] Types of maintenance requested (programming, calibration, sensor replacement)
] The date and time
] The low battery condition
] The self-adjustment request
] The maintenance function request
1.9.1 Memory Capacity
The number of readings which can be stored is limited by the size of the memory of the OMNI-4000. The recording
capacity is 48 hours, with a limit of 8 events per channel per each 24 hours.
If the quantity of data to be stored exceeds the storage capacity of the OMNI-4000, the oldest data are lost (FIFO -
First In, First Out - procedure). The lost data are replaced by the new data.