HD45 / HD46
- 21 -
V2.4
4.3 LED indicators in HD45
BVR and HD45
BAR models
HD45
BVR
and
HD45
BAR
models are supplied with four LEDs which show the air
quality level.
The passage from a level to the other is established based on the values of three
thresholds, preset to the following values.
Lower threshold = 600 ppm
Medium threshold = 800 ppm
Upper threshold = 1400 ppm.
The level indication is obtained according to the following procedure:
Optimal:
It is on the green LED
CO
2
< Lower threshold
(600 ppm)
Satisfying:
it is on the green LED
CO
2
> Lower threshold (600 ppm)
CO
2
< Medium threshold (800 ppm)
Mediocre:
It is on the yellow LED
CO
2
> Medium threshold (800 ppm)
CO
2
< Upper threshold (1400 ppm)
Poor:
It is on the red LED
CO
2
> Upper threshold (1400 ppm)
LEDs turn off when the measuring value falls below the threshold minus the
hysteresis, which is common to the three thresholds and is factory preset to 20 ppm.
Threshold values and hysteresis can be configured. For the setting procedure, see
section “CONFIGURATION”.
LED indicators operate independently from relay operation. Indicator thresholds and
hysteresis are different parameters than relay thresholds and hysteresis. So, relay can
be activated at different values than LED thresholds.
4.4 Logging
Instruments are in continuous logging mode from the moment they are powered. The
logging interval is preset to 5 minutes.
The instrument can store up to 2304 samples. Each sample consists of all the values
measured by the instrument. Samples do not include date and time of data
acquisition.
Memory is managed in a circular way, so that, when memory is full, the most recent
samples overwrite the older ones.
If power supply is interrupted and then restored, logging is restarted in a new session,
allowing in this way identification of stored data in the current run session.
Stored values can be downloaded to a PC with the help of the application program
DeltaLog14
or through the protocol indicated in the section “COMMUNICATION
PROTOCOL”.
