Section 2 Detective+
VI. Data Logging
The data logging aspect of the instrument can be configured to be active when
the instrument is switched on by the START menu option. Additionally, the
instrument records events (such as alarms) and an event will cause the logger
to be switched on.
Data is logged for all gas channels at a rate set by the log period, which is
configurable via Portables PC software. The standard logging interval is 1 min-
ute. For each channel, the maximum level (minimum in the case of oxygen) is
recorded since the last reading was taken and stored in the log. Thus, even if
the log period is set to 10 minutes (for example) and a brief gas hazard occurs,
it will not be missed by the logger. Logged data is retained in battery-backed
memory when the instrument is turned off. When the memory is filled, the new
data over-writes the oldest.
A log is extracted from the instrument and saved as a file on the computer via
the Portables PC software, which also allows viewing of the logged data on
the PC.
The instrument notes the following events in the log along with a note of the
channel the event is associated with (if appropriate):
Log switched on – either from front panel or by event trigger
Log switch off – either front panel or by instrument switch off
Sensor channel overrange
Instantaneous alarm 1
Instantaneous alarm 2
Instantaneous alarm 3
Short term exposure alarm
Long term exposure alarm
User triggered event (from the instrument front panel)
Change of user (from the front panel)
Change of site (from the front panel)
The instrument is capable of storing just over 6300 data logs for all channels.
Events take the space of 2 logs.
Data Logging Detective+
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