5.5.1.2 Short Term History
At a certain logging rate (adjustable; see Section 5.5.1.5), the date and time plus ten
variables are stored in the historic data file Short Term. Its capacity is 480 recordings;
when the file is full and a new recording occurs, the oldest recording is deleted (first in,
first out method).
Navigation is performed as follows:
• From History; ShortTerm, press ENTER to read the date and time of the last event
recorded in the historic data file Short Term.
• Press UP or DOWN to read the date and time of previous or next recordings.
• Press ENTER and UP or DOWN to read the value of the variables at the selected
date and time.
The ten variables recorded in the historic data file Short Term are the same as the
ones recorded in the Events file (see Section 5.5.1.1).
5.5.1.3 Long Term History
From one to four times per day (adjustable; see Section 5.5.1.5), the date and time
plus ten variables are stored in the historic data file Long Term. Its capacity is 480
recordings; when the file is full and a new recording occurs, the oldest recording is
deleted (first in, first out method).
Navigation in this file is performed the same way than in the historic data file Short
Term (see Section 5.5.1.2).
The ten variables recorded in the historic data file Long Term are the same as the
ones recorded in the Events file (see Section 5.5.1.1).
5.5.1.4 Service History
A semimonthly, automatic test of the Hydran 201 sensor is performed the first and
fifteenth days of each month at midnight (fixed logging rate, non-adjustable); for each
test, the date and time of the test plus seven variables are recorded in the historic data
file Service. Its capacity is 120 recordings (five years); when the file is full and a new
recording occurs, the oldest recording is deleted (first in, first out method).
Navigation in this file is performed the same way than in the historic data file Short
Term (see Section 5.5.1.2).
The following seven variables are recorded in the Service file:
• Battery (voltage of the battery).
• ServiceL (value of the ServiceL variable).
• ServiceI (value of the ServiceI variable).
• ServiceA (value of the ServiceA variable).
• SensorTemp (temperature of the H201 sensor).
• SerialNumber (serial number of the H201 sensor).
• GasLevel.
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