Page 57
Hydran* M2-X Instruction Manual
MA-029
Rev. 1.0,
30-Jul-18
•
Sensor Temp Avg.
: Average temperature of the sensor, in °C. The period used to
calculate this value is set with parameter
Sens. Temp Avg Per.
in
Setup >
Readings
Setup
(see Section 3.2.8.3).
•
H
2
O Cell mV
: Voltage of the electrical signal currently sent by the moisture
sensor
.
3.4.2
View History Data
The Hydran M2-X has an internal function that automatically records information
such as gas and moisture levels, trend values, alarm messages and setup
parameters. This information is stored in four sections, which are collectively referred
to as
history files
.
The
View History Data
functions are used to consult the four history files:
•
Short Term (recording at a fixed logging rate; example: every 15 minutes)
•
Long Term (recording at fixed logging rates; example: each day at midnight)
•
Events (recording at the time of events; example: alarms)
•
Service (recording at the time of the semimonthly, automatic sensor test)
The maintenance procedure in Section 9 shows how the data of the history files
can be used.
3.4.2.1
Short Term History
The
Short Term History
function gives access to the Short Term history file. From
1 to 360 minutes (adjustable; see parameter
Short Term Rate
in
Setup > History
Setup >
History Log Rate
[see Section 3.2.6.1]),
the date and time plus several values
are logged in this file. Its capacity is 4,760 records (if equipped with four analog input
inter-faces); when the file is full, a new record erases the oldest one in a first in, first
out method.
The following variables are recorded in the Short Term history file (this list is
identical for the Long Term and Event history files):
•
Gas level in ppm.
•
Service U.
•
Hourly trend in ppm/x hours (default value is 24 hours).
•
Daily trend in ppm/x days (default value is 30 days).
•
Service V.
•
Relative humidity level in %.
•
Relative humidity average in %/x hours.
•
Moisture level in ppm.
•
Moisture average in ppm/x hours.
•
H
2
O cell signal in V (microvolts).
•
Heater plate temperature in ˚C.
•
Heater plate output power in percentage.
•
Sensor temperature in ˚C.
