Operational Description; Installation; Warning - Tecno Control TS255CN2 User Manual

IST-2255.CN01.01
Nitrogen dioxide (NO
density has to air is 1.58). Combined with water turns into nitric acid and nitric oxide.
NO is formed in most combustion processes using air as the oxidant. At elevated temperatures nitrogen combines
2
with oxygen to form nitrogen dioxide. The most important sources of NO
plants, heating and vehicles, especially diesel engines). NO
to the lungs, pulmonary edema and death as it is capable of combining with the haemoglobin by changing the
chemical and physiological, forming metaemoglobina which is no longer able to carry oxygen to the tissues. Also,
low concentrations (4 ppm) will anesthetize the nose.

OPERATIONAL DESCRIPTION

The two electrochemical sensors are temperature compensated, but are sensitive to extreme humidity variations.
The calibration is carried out with CO an NO
should be present in the same environment as listed in
P : when powered, both the sensors needs a time of preliminary heating of about 60 seconds. During
REHEATING
this period the two yellow LED "FAULT" flashes. After this period, the two yellow LED lights off, the green LED "ON"
illuminates to indicate normal functioning. After this period the unit is able to detect gasses even if it attains the
optimum stability conditions after about 4 hours of continual functioning.
N : the green LED "ON" should be light on.
ORMAL OPERATION
The Red LED (ALARM CO) illuminates when CO concentration attains 150 ppm.
The Red LED (ALARM NO
F : the instrument signals different kind of failures, as listed below. The Yellow LED, FAULT CO or FAULT NO
AULTS
illuminates and the "S1" CO output or "S2" NO
If a Yellow LED illuminates each 4 seconds (with Green LED activate): this happens when the corresponding
"Cartridge Sensor" has exceeded its theoretical period of life and its correct operation is not longer guaranteed. The
detector keeps on operating normally but it is necessary to replace, as soon as possible, the corresponding
"Cartridge Sensor" with a new one. The type to be required is described at
described in the attached manual.
If a Yellow LED activate and the Green LED is off (0 mA output signal): this signal different kind of faults. 1) The
corresponding "Cartridge Sensor" is not working, please replace with new one. 2) If a new "Cartridge Sensor" is
installed or it is not correctly connected or a not compatible one is mounted. Please check the cartridge
connections and compatibility
does not change, it will be necessary to replace the unit and/or send it back to the supplier to repair.
If a Yellow and the Green LED activates (0 mA output signal): this happens when the "Cartridge Sensor" is not
working. First try to perform the procedure of "ZERO" as described in the section "Test and Calibration > Zero
adjust" then disconnect and connect the unit, finally try to replace a new "Cartridge Sensor". If the condition is not
change, it will be necessary to replace the unit and/or send it back to the supplier to repair.
If the Green LED, one Yellow and the corresponding Red LED activate (>24 mA output signal): this happens
when the "Cartridge Sensor" is not working or gas concentration is out of scale (higher than CO>375 ppm or NO
there are not any gas leaks and the condition is not change, it will be necessary to replace the unit and/or send it
back to the supplier to repair.

INSTALLATION

The detector must be accurately installed according to the national dispositions in force on the safety of the plants
and installation of electric devices.
D : The
ETECTOR POSITIONING
sensor downwards. It should be fixed at 1.60 m from the floor (the CO gas is lighter as air, while NO
Electrical Connection
the Table 1. Normally use a four wire shielded cable. The terminals (+, -, S1, S2), are plug-in type, it is necessary to
extract them to make the connection. Pay attention when you insert them again, being polarized.
: Once installation is completed, it is necessary to adjust the sensors to the environment conditions,
I
MPORTANT
connect the unit, wait about 30÷60 minutes and the carry out the "Zero Adjust" (see 'Test and Calibration >).
COMPATIBILITY WITH OTHER CENTRAL UNITS: In case of a central unit other then Tecnocontrol, please
verify the max load resistor as shown in
400 ohm with 24Vdc power supply. We suggest using 24Vdc power supply.

WARNING

A of the sensors, in clean air and in normal working condition is about 3÷4 years. After this period
VERAGE LIFETIME
when the corresponding yellow LED flashes every 4 seconds, it is necessary replacing the CO and/or NO
"Cartridge Sensor".
P : we advise to carry out working tests at least every year Tests, Zero Adjust and Calibration
ERIODICAL TESTING
with CO/Nitrogen (for S1) and NO
N : the detector is not able to detect gas occurring outside the room where it is installed, or under the floor.
OTE
S
ENSOR OPERATING LIMITS
lower than -40° or higher than 60°C. The electrochemical cells should not be exposed to an over-range
concentration of 1500 ppm CO and 150ppm NO
sensor.
TECNOCONTROL S.r.l. Via Miglioli 47 SEGRATE ( MI )
Istruzione / User's Manual / Manuel d'utilisation
) is a reddish-brown toxic gas with a characteristic sharp, biting odour, heavier than air (its
2
2
) illuminates when CO concentration attains 15 ppm.
2
output, falls down to 0 mA.
2
(see Table 3) these checks are made switching off and on the device. If the condition
Fig. 1 shows the instrument size. The unit must be wall mounted positioned with the
(see Fig.2): the maximum distance to install each detector from the Central Unit is show in
Fig. 4. The max load resistor is 50 ohm with 12Vdc power supply, while is
/Nitrogen (for S2) mixture as explained on
2
: both the electrochemical cells, in any case, should not be exposed to temperatures
is toxic by inhalation, it can cause irreversible damage
2
gas. Anyway, it can contemporaneously detect other gases that
table 4.
. If this condition occurs, we suggest replacing the corresponding
2
are internal combustion engines (power
2
Page 1. The replacement procedure is
gas is heavier than air).
2
page 6 chapter "Tests and Calibration".
Tel. +39 02 26922890 - Fax +39 02 2133734
Pag.5/11
2
>32ppm). If
2
2