User manual

Operating Instructions OPUS20E For external sensors
10
EN
8.2 Calculation Channels for
Measurement Conversion
Using the SmartGraph software, analog sensors that deliver a current or voltage
value can be used as calculation channels for measurement conversion. Calcu-
lation channels allow input variables from analog sensors that deliver a current
or voltage value to be converted into the actual measurement variable. Units of
measurement, conversion parameters and decimal place settings can be speci-
fied and assigned to a sensor type (see Table 2).
You will find more detailed information on how to use the software to
configure calculation channels in the software manual which you can call up
via the Help function of your SmartGraph software.
8.3. Displaying Measurement Values
One of the channel groups specified in Table 1 can be configured to display
measurement values on each of the three lines provided on the display for this
purpose. The current measurement is always displayed.
8.4. Data Logging
When you select operating mode M3 or M4, the data logger is in the logging
mode (REC) and the measurement values of the measurement channels pre-se-
lected for logging are stored in the device.
Up to 20 of the measurement channels specified in Table 1 can be logged in par-
allel and stored in the memory of the measuring device.
Logging begins immediately as soon as operating mode M3 or M4 is selected
and is executed in the ring mode. This means that logging does not end when
the memory is full but is permanently ongoing. For this purpose, the oldest
values are continuously overwritten with the most recent data.
R
Tip: The current, minimum, maximum and mean measurement values
of a channel group represent an individual measurement channel in
each case. If you want these measurements to be available for subsequent
documentation and analysis, each of these measurement channels must be
pre-selected for logging at the memory organization level, as subsequent
computation of these measurements is not available on the software side.
Using the software, you can set up the individual specifications for the type,
duration and scope of data logging in the logging mode. You will find detailed
information about this in the software manual.
9. Alarm Function
9.1. Alarm Configuration
The data logger management can be used to configure an alarm for each indi-
vidual measuring channel which has been selected for display or logging.
First you must define both an upper and a lower alarm threshold so as to set a
corridor within which the values are deemed to be good. The data logger trig-
gers the alarm as soon as the measured value is outside this corridor, i.e. one
of the thresholds has been exceeded.
Please note: The alarm function will only be displayed for the channel groups
of the three measurement channels which have been previously selected to
be displayed and only in the operating modes M2 and M3.
Alarm incidents of further selected measurement channels in logging mode are
saved regardless of whether they have been selected to be displayed or not.
This means that alarm incidents of measurement channels that have not been
selected for display but which have been selected for logging will be saved.
All selected alarm incidents are also recorded when the display has been deac-
tivated in operating mode M4.
9.2. Alarm Symbol on the Display
The alarm will only appear on the dis-
play for measurement values which
have been selected to be displayed and
which have been configured with an ac-
tive alarm function. When an alarm has
been triggered on one of these meas-
urement channels, an alarm symbol ap-
pears next to the measurement value
for this specific channel. The symbol con-
tinues to flash until the measurement
value returns to the preset corridor.
The alarm symbol stops flashing as soon as the measured value is within the se-
lected thresholds. The alarm symbol remains on the display.
This is to show the user that an alarm has been triggered and that an alarm in-
cident has occurred. If the threshold values are exceeded again, then the alarm
symbol starts to blink again.
The alarm symbol disappears when the memory is read out.
A hysteresis can also be set which switches off the alarm when the measured
value is once again within the corridor.
9.3. Acoustic Alarm
When an alarm is triggered when the acoustic function is active (see chapter
6.2.4. Acoustic Function), an alarm tone sounds in addition to the alarm symbol
on the display. The logger stops emitting the tone when the measured value is
within the corridor.
Display example for an alarm incident
of the measurement channel displayed
in the first measurement line.
Alarm display
Upper alarm
threshold value
Set value
corridor –
“Good sector”
Lower alarm
threshold
value
Flashing
Static
Logging mode
Reading out the value memory
Table 2: Available Calculation Channels for Measurement Conversion
Assignable units:
counts, logic, digits, °C, °F, K, °Cdp, °Fdp, %rH, g/kg, g/m³, µm, mm, cm, dm, m, km, in, mil, ft, mi, m/s, km/h, kts, ppm,
mV, V, mA, A, Hz, kHz, bar, mbar, Pa, mPa, hPa, kPa, m³, l, s, ms, µs, %, °, mm/h, m³/h, l/m², in/h, mil/h, g, kg
Assignable sensor types:
Temperature, relative humidity, absolute humidity, dew point, battery voltage, voltage, current, absolute air pressure, relative air pressure,
building moisture, flow velocity, mixing ratio, CO2 concentration, particle 0.1 µm, particle 0.2 µm,
particle 0.3 µm, particle 0.5 µm, particle 1 µm, particle 5 µm, particle 10 µm, particle x µm, particle y µm, particle z µm,
unknown, inactive, cooling limit temperature, global radiation, daylight, precipitation amount, wind speed,
wind direction, analog/digital input, soil moisture, leaf wetness