Installation; Warning; Test And Calibration - Tecno Control SE237S F1-H Manuel D'utilisation

IST-2137.SF01.01

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 in areas, with the presence of toxic or flammable gases.
Mounting: The Fig. 2 shows the instrument size. The detector must be positioned vertically with the sensor down-
wards. Avoid obstacles that impede the view of the detector or the diffusion of air around the sensor. Consider that
the air movements can affect the gas detection. Avoid mounting in corners, near doors or windows or in the direct
flow of air vents or ventilation systems. Normally, the detector should be installed indoors.
SE237SF positioning: Consider that halocarbons are gas heavier than air. Usually it should be fixed at 20-30cm
from the floor. Please, carefully evaluate the condition of the environment in order to have the best detection.
- If the detector is placed in refrigerated environments, place it in the area of return of the flow of air from the
environment towards the recirculation system / air conditioning; but not in the direct flow.
If the detector is positioned in the compressor rooms, place it close to them in proximity of the suction grilles /
-
recirculation of air; but not in the direct flow.
- Consider that the main causes of gas leaks in an air conditioning system are valves, fittings, flanges and con-
nections. Avoid placing the detector too close to the pressure parts of the system because a gas leak may not
be accurately detected (if the gas, leaking, has too high a flow, may not be detected by the sensor).
Electrical Connection (see
Table 1. If more than one detector is to be powered in parallel, it is necessary to consider the voltage drop across
the supply cable. Normally use a two wire cable (not shielded) for power supply + the conductors for output relay.
The opening and the electrical connection must always be made to the detector without power.
NOTE: If the mA output signal is used, please use 3 conductors screened cables + conductors for relay output. The
max load resistor is 50ohm with 12VDC (-10%) power supply, while is 500ohm with 24VDC (-10%) supply
Power Supply terminals, on the main board, are plug-in type, it is necessary to extract them to make the connec-
tion. Pay attention when you insert them again, being polarized. The relays terminals, on outputs board, are fixed.
The sealed relays are tension free SPST (Single Pole Single Throw) contacts and should be set NO (Normally Open) or
NC (Normally Closed) by positioning the 4th Dip-Switch
tration for alarm activations is determined.
NOTE: Dip-Switch should be set with instrument powered off. Dip-Switch settled in reserved position acti-
vate Fault indications (see "Operational Description >
Important: Once installation is completed, power up the unit, wait at least 48 hours (powered continuously) and
then, only if it is necessary, to adjust the sensor to the environment conditions, carry out the Zero Adjust (see

Test and Calibration).

COMPATIBILITY WITH OTHER CONTROL UNITS: If you also use the mA output signal, with a Control Unit other
than Tecnocontrol, calculate the maximum load resistance using the graph in
power supply. We accept no responsibility for any malfunction, failure or damage caused by products that
are not compatible or not of our production.

WARNING

Average life: In fresh air and in normal working condition the sensor's life is about 5 years from the date of instal-
lation. After this period the yellow LED "FAULT" flashes every 4 seconds, is necessary replacing the "Cartridge
Sensor". Consider that the aging of the sensor involves an increase in its sensitivity, therefore non periodic calibra-
tion and replacement of the cartridge increases considerably the probability of false detections.
After a real exposure exceeding the sensor operating limits (10.000 ppm), the detector must be tested with the
sample gas, as explained in the paragraph: "CALIBRATION CHECK".
Periodical testing: for checking effective functioning of the detector, we advise to carry out working tests every 6-
12 months, with the specific Refrigerant Gas/Air mixture as explained on chapter "TEST and CALIBRATION".
Note: the detector is not able to detect gas leaks occurring outside the room where it is installed, neither inside
walls nor under the floor.
Important: The semiconductor sensor operates only in presence of Oxygen. Do not use pure gases or a
lighter directly on the sensor since they could damage it irremediably.
Warning: Consider, that life and performance of the sensor can be greatly reduced, in extreme conditions of hu-
midity, high temperatures, or polluted environments with high levels of organic vapours or flammable substances
(in particular solvents), or with very high concentrations of refrigerant gas.
Some substances cause a total loss or permanent reduction of sensitivity. Avoid contacts of the sensor with va-
pours of Silicone compounds (present in paints and sealants). High concentrations of corrosive substances such as
Hydrogen sulphide, Sulphur oxides, Chlorine and Hydrochloric acid, can destroy the sensor. Even excessive vibra-
tion or mechanical shock can damage the sensor.
TEST and CALIBRATION
PAY ATTENTION: This procedure has to be made with extreme attention and by authorized and trained
people; because starting this procedure, it will start both Outputs (relays) causing the activation of con-
nected alarm devices.
Operation Check, Zero Adjust, Calibration Check and Calibration: are different code protected functions. To
access these functions is necessary to insert the relevant "Code" through the keys F1 and F2. To have the key
pressure recognized, hold pressing it for around a second (until the Green LED doesn't switch off for a moment). Then the
TECNOCONTROL S.r.l. Via Miglioli 47 SEGRATE ( MI )
Istruzione / User's Manual / Manuel d'utilisation
Fig.2): the maximum distance to install each detector from the power supply show in the
(see Table 3). With the Dip-Switches from 1 to 3 the concen-
Faults").
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Figure 4. We suggest using 24VDC
Pag.6/12
(see fig.4).