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IST-1424.CE02.02
Description of items related to the Preconfigured sensor:
It is a TAG than 10 characters, selectable one at a time, where you can write a note or a
TAG
reminder for a sensor (e.g. FLOOR 2, BOILER, etc.).
Defines the type of ALARM of the sensor and establishes how they should be set the
AL.
thresholds of the various alarm levels. In the specific:
• INCREASING:
ALARM 3 ≥ ALARM 2 ≥ ALARM 1 ≥ FAULT (current <1mA). All our sensors, except Oxygen
detectors, are set with this type of alarm.
• DECREASING:
(current <1mA) ≤ ALARM 3 ≤ ALARM 2 ≤ ALARM 1 ≤ SENSOR SCALE. Only our Oxygen detectors
are set with this type of alarm.
• OXYGEN:
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 Oxygen
detectors can be set with this type of alarm.
Only for Oxygen detectors, Alarm 2 is displayed as AL , while the alarm 3 as AL
• TLV:
(Threshold Limit Values) 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 (Time-Weighted Average) 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 (Threshold Limit Value–Short-Term Exposure 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 (Threshold Limit Value-Ceiling) 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
(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
This parameter can only be changed in the sensors where the alarm is PARKING EN
• TWA:
(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).
Indicates the value, above which, the corresponding alarm is activated.
• THRESHOLD:
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 (TS220EO/TS293EO/TS593EO) whose hysteresis is 2%. The level of fault (FAULT)
has a hysteresis of 1mA, so a sensor failure comes out when his current exceeds 2mA.
TECNOCONTROL S.r.l. - Via Miglioli, 47 20090 SEGRATE (MI) - Tel. 02. 26 92 28 90 - Fax 02. 21 33 734
CE424P / User Manual
The alarm levels will be set in ascending order, i.e. SENSOR SCALE ≥
The alarm levels must be set in descending order, i.e. FAULT
The alarm levels should be set to detect deficiency or excess of the
(see Table
3) can only be set with our sensors for toxic gases in car parks car
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