Installation; Warning - Tecno Control SE138K Manuel D'utilisation

IST-2138.KM02.01/A
indicate normal functioning. After this period the unit is able to detect gas even if it attains the optimum stability
conditions after about 4 hours continual functioning.
Normal operation: the green LED "ON" should be light on.
The 1st° Red LED (ALARM 1) illuminates when the Gas concentration attains 1st alarm level and after about 12
seconds , the "ALARM 1" relay will activate.
The 2nd Red LED (ALARM 2) illuminates when the Gas concentration attains 2nd alarm level and after about 30
seconds, the "ALARM 2" relay will activate.
The 3rd Red LED (ALARM 3) illuminates when the Gas concentration attains 3rd alarm level and after about 60
seconds, the "ALARM 3" relay will activate.
Faults: the instrument signal different kind of failures, as listed below. The Yellow LED illuminates, the "S" output
falls down to 0mA and the "FAULT" normally activated relay deactivate. The "FAULT" relay, if necessary, can be
used both to signal remotely an occurred damage and to signal the absence of power to the instrument.
Yellow LED illuminates each 4 seconds (with Green LED activate): this happens when the "Cartridge Sensor" has
overcome its period of life (about 5 years) 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 "Cartridge Sensor" with a new one. The
type to be required is listed in 2
Yellow LED activate, Green LED off ( FAULT relays activate and 0mA output signal): this signal different kind of
faults. 1) The Dip Switch set up is wrong, please verify
please replace with new one. 3) 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
made connecting and disconnecting the device. If the condition does not change, it will be necessary to replace the
unit and/or send it back to the supplier to repair.
Yellow and Green LED activates ( FAULT relays activate and 0mA 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 Calibra-
tion > 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.
All LED activate ( FAULT relays activate and >24mA output signal): this happens when the "Cartridge Sensor" is not
working or gas concentration is out of scale (higher than 25% LIE) If 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 and testing according to the national dispositions in force on the safety of
the plants and installation of electric devices in areas with danger of explosion.
Mounting: The
Fig. 2 shows the instrument size. The unit must be positioned vertically with the sensor downwards.
Models SE138KG and SE138KB should be fixed at 20-30 cm from the floor (LPG and Petrol vapours are heavier than air).
Models SE138KM and SE138KI should be fixed at 20-30 cm from the ceiling (Methane and Hydrogen are lighter than air).
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. If
the output signal is used in mA, please use 3 conductors screened cables + conductors for relay output. The max load
resistor is 50 ohm with 12Vdc (-10%) power supply, while is 500 ohm with 24Vdc (-10%) power supply
Power Supply terminals, on the main board and the relays terminals, on outputs board, are plug-in type, it is neces-
sary to extract them to make the connection. Pay attention when you insert them again, being polarized.
The relays are solid state type, the max connecting resistive load is 24V/1A. They have tension free SPST (Single
Pole Single Throw) contacts and should be set NO (Normally Open) or NC (Normally Closed) by positioning the 4th Dip-
(see Table 3). With the Dip-Switches from 1 to 3 the concentration for alarm activations is determined.
Switch
Note: Dip-Switch should be set with instrument powered off. Dip-Switch settled in reserved position activate Fault
indications (see "Operational Description > Faults").
Important: Once installation is completed, it is necessary to adjust the sensor to the environment conditions, con-
nect the unit, wait about 20÷30 minutes and the carry out the "Zero Ad just" (see 'Test and Calibration >).

WARNING

Average life: The sensitive element used in this detector has an excellent stability in time. In fresh air and in nor-
mal working condition the sensor's life is about 5 years from the date of installation. After this period the yellow LED
"FAULT" flashes every 4 seconds, is necessary replacing the "Cartridge Sensor".
Periodical testing: we advise to carry out working tests every 12 months. Tests, Zero Adjust and Calibration with
Gas/Air mixture as explained on
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 catalytic 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: some substances cause a permanent reduction in sensitivity. Avoid contacts of the sensor with vapours
of Silicone compounds, Tetra-ethyl Lead (petrol antiknock additive) and Phosphate esters, since they can reduce
irremediably its sensitivity. Some substances produce a temporary loss of sensitivity. This "inhibitors" include Hy-
drogen sulphides, Chlorine, Chlorinated hydrocarbons and halogenated compounds. The sensitivity is recovered
after a short period of running in clear air.
TECNOCONTROL S.r.l. Via Miglioli 47 SEGRATE ( MI )
Istruzione / User's Manual / Manuel d'utilisation
nd
column Table 4. The replacement procedure is described in the attached manual.
Fig.2): the maximum distance to install each detector from the power supply show in the
page 4 chapter "Tests and Calibration".
(see Table 2-3). 2) The "Cartridge Sensor" is not working,
Tel: 02/26 92 28 90 Fax: 02/21 33 734
Pag.5/10
(see Table 4) these checks are
fig.4).
(see