072
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DATALOGGER
NI2400
NI2400
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DATALOGGER
NI2400
NI2400
• in field
SEnSibiliTy
insert the sensibility of sensor (for example 0.2 mm/count)
;
• in field
uniT
of
mEASurE
insert the unit of measure of the done conversion (example
“mm”)
With this configuration, the NI2400 acquires the number of impulses for a period of a hour.
Once this interval ends, the NI2400 memorizes the number of counts done during this pe-
riod of time.
If for example in one hour 5 counts are detached, the NI2400 applies the following conver-
sion:
5 COUNT * 0.2 MM/COUNT = 1 MM
Once tche value is memorized, the counter sets to zero.
Alarm configuration is the same as all other channel types, with High, Low and Derivative
Thresholds. VC alarm with Logical Operations is present, as a Virtual Channel alarm can be
used in Virtual Channels Logical Alarms.
VIRTUAL CHANNELS
Overview
This chapter is focused on Virtual Channels (VC from now on), to understand why VC are
implemented on OM datalogger and how to configure them.
1. Why are Virtual Channels implemented in OM Family? – This paragraph shows benefits
of Virtual Channels
2. Scripts – Scripts are a fundamental section of Virtual Channels’ architecture.
3. Virtual Channels configuration – “HOW TO” use and configure Virtual Channels’ with
analog and digital sensors, digital input and multiplexers.
4. Common Errors – Here are shown common errors made during virtual channels creation,
and how to avoid them.
Why are Virtual Channels Implemented?
We usually use sensors to get a measure. Anyway, we could need a way to modify that
number because we need either a derived measure (airflow/airspeed) or an expression cal-
culated on more than 1 sensor (dewpoint or Δ
t between two zones for instance). We can
calculate this with spreadsheet or just let our datalogger do the work.
OM Family has this feature with Virtual Channels.
Virtual Cannels allows operations to be made on a single channel or between channels.
OM group them into Scripts, with a maximum of 5 scripts containing 16 virtual channels
each. Each Virtual Channel can handle up to 9 elements (including Virtual Channel beloning
to the same script).
Figure 63
Figure 62
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3