IST-1408.PA01.02 - Dis.0534045
CE408P / User Manual
Pag. 18/41
GECA S.r.l. - Via E. Fermi, 98 25064 GUSSAGO (BS) - Tel. 030 3730218 - Fax 030 3730228
Description of items related to the Preconfigured sensor:
TAG:
It is a
TAG
than 10 characters, selectable one at a time, where you can write a note or a
reminder for a sensor (e.g. FLOOR 2, BOILER, etc.).
AL.:
Defines the type of
ALARM
of the sensor and establishes how they should be set the
thresholds of the various alarm levels. In the specific:
•
INCREASING
: The alarm levels will be set in ascending order, i.e.
SENSOR
SCALE
≥
ALARM 3
≥
ALARM 2
≥
ALARM 1
≥
FAULT (current <1mA)
. All our sensors, except
for the detection of oxygen, are set with this type of alarm.
•
DECREASING
: The alarm levels must be set in descending order, i.e.
FAULT
(current <1mA)
≤
ALARM 3
≤
ALARM 2
≤
ALARM 1
≤
SENSOR SCALE.
Only our sensors to
detect oxygen are set with this type of alarm.
•
OXYGEN
: The alarm levels should be set to detect deficiency or excess of the
normal presence of oxygen in the air (20.9% v / v), i.e.
FAULT (current <1mA)
≤
ALARM 2
≤
ALARM 1
≤
20.5% volume and 21.5% volume
≤
ALARM 3
≤
SENSOR SCALE
. Our sensors to
detect oxygen can be set with this type of alarm.
Alarm 2 is displayed as AL
,
while the alarm 3 as AL
.
•
TLV:
(
T
hreshold
L
imit
V
alues
) are the exposure limit values for toxic substances to
which workers may be exposed every day for the entire duration of working life without harmful
effects. Must be set in ascending, i.e.
SENSOR SCALE
≥
ALARM 3
≥
ALARM 1
≥
ALARM 2
≥
FAULT (current <1 mA).
In this case, each alarm level is a value obtained with a temporal
average. TLVs in detail are:
o
ALARM 1 = TLV-TWA (
T
ime-
W
eighted
A
verage
)
is
the
time-weighted average concentration
for a conventional 8-hour workday and a 40-hour
workweek, to which it is believed that nearly all workers may be repeatedly exposed, day after
day, without adverse effect. This alarm is triggered when the weighted average concentration
within 8 hours exceeds the set threshold.
o
ALARM 2 = TLV-STEL
(
T
hreshold
L
imit
V
alue–
S
hort-
T
erm
E
xposure Limit
)
is the concentration to which it is believed that workers can be
exposed
continuously for a short period
of time without suffering from irritation, chronic or irreversible
tissue damage, or narcosis. STEL is defined as a 15-minute TWA exposure, which should not
be exceeded at any time during a workday. This alarm is triggered when the weighted average
concentration in the last 15 minutes, exceeds the set threshold.
o
ALARM 3 = TLV-C (
T
hreshold
L
imit
V
alue-
C
eiling
)
is
the concentration that
should not be exceeded
during any part of the working exposure. This
type of alarm is triggered when the instantaneous concentration exceeds the set threshold. Are
not carried out, time weighted average.
Only our sensors for detection of toxic gases can be set up with this type of alarm.
•
PARKING EN
:
The alarm levels should be set so increasing, i.e.
SENSOR
SCALE
≥
ALARM 3
≥
ALARM 2
≥
ALARM 1
≥
FAULT (current <1 mA).
In this case, the first
two levels of alarm representing a value obtained with a time average between 5 and 60 min.
(
according to standard EN 50545-1 for the car parks
). This value can be set via the parameter
TWA
. Level 3, however is instantaneous.
This type of alarm (
see Table 3
) can only be set with our sensors for toxic gases in car parks car
(series TS220 and TS293 / EC/EN/EN2) or the dual sensors (series TS255).
•
ZONE:
Sets the area that will be associated with the sensor. The areas available are
2. The area
0
means that the sensor is not associated in any area
•
TWA:
This parameter can only be changed in the sensors where the alarm is
PARKING EN
(
in all other cases is fixed at zero
). Is how many minutes are carried out time-
weighted average for the activation of the 2 alarms? The value can be chosen between 5 and 60
min. (
in accordance with standard EN50545-1 for the car parks
).
•
THRESHOLD:
Indicates the value, above which, the corresponding alarm is
activated.
The thresholds have a hysteresis to prevent the output will cycle on and off continuously
(concentration fluctuates around the threshold value). This hysteresis is 20% of the value of the set
threshold, for all models of sensors. Only exception is for models for detection of oxygen
