IST-2137.EC03.01/E
Istruzione / User’s Manual / Manuel d’utilisation
Pag.10/20
TECNOCONTROL S.r.l. Via Miglioli 47 SEGRATE ( MI )
Tel. +39 02 26922890 - Fax +39 02 2133734
erating normally but it is necessary to replace, as soon as possible, the “
Cartridge
” with a new one. The type to be
required is described on
Page 1
. The replacement procedure is described in the attached manual.
Yellow Led activate, green Led off (
FAULT relay activates and 0 mA output signal
):
this signal different kind of faults.
1)
The Dip-Switch set up is wrong, please verify (
see Tables 2 and 5÷11
).
2)
The “
Cartridge
” is not working, please re-
place with new one.
3)
If a new
“
Cartridge
” is installed or it is not correctly connected or a not compatible one is
mounted. Please check the cartridge connections and compatibility (
see on page 1
) these checks are made switching
off and on 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 relay activates and 0 mA output signal
):
this happens when the “
Cartridge
” is
not working. First try to perform the procedure of “
ZERO
” as described in the section
“
Test and Calibration
> Zero ad-
just
”
then disconnect and connect the unit, finally try to replace a new
“
Cartridge
”. If the condition is not change,
please replace
the unit and/or send it back to the supplier to repair.
All Led activates (
FAULT relay activates and >20 mA output signal
):
this happens when the “
Cartridge
” is not working or
gas concentration is higher than F.S. If there are not any gas leaks and the condition is not change, it will be nec-
essary 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.
SE137EA and SE137EA-H positioning:
should be fixed at 30÷50 cm from the ceiling (
NH
3
gas is lighter than air
).
SE137EC-S and SE137EC-H positioning:
should be fixed at 1.60 m from the floor (
CO
gas is a little lighter than air).
SE137ES positioning:
should be fixed at 30÷50 cm from the floor (
SO
2
gas is heavy as air)
SE137EH positioning:
should be fixed at 30-50 cm from the floor (
H
2
S
gas is heavier than air).
SE137EHCN positioning:
should be fixed at 1.60 m from the floor for the protection of persons or over the likely
point of emission. (
HCN
gas is a little lighter than air
).
SE137EN positioning:
should be fixed at 1.60 m from the floor
(
NO
gas is heavy as air).
SE137EN2 positioning:
should be fixed at
30÷50
cm from the floor
(
NO
2
gas is heavier as air).
SE137EHCL positioning
: should be fixed at 30÷50 cm from the floor
(
HCL
gas is heavier than air).
SE137ECL positioning
: should be fixed at 30÷50 cm from the floor
(
CL
2
gas is much heavier than air).
Electrical Connection (
see Fig.2
)
: the maximum distance to install each detector from the power supply show in the
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 the conductors for output relay.
If
the output signal is used in mA, please use 3 conductors screened conductors for relay output. The max
load resistor is 50 ohm with 12Vdc power supply, while is 400 ohm with 24Vdc power supply (
see fig.4
).
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 (
S
ingle
P
ole
S
ingle
T
hrow)
contacts and should be set NO (Normally Open) or
NC (Normally Closed) by positioning the 4th Dip-Switch (
see Table 2
). With the
Dip-Switches from 1 to 3 the concen-
tration for alarm activations is determined. Some alarms can be set with TLV-TWA and STEL functioning.
Note: Dip-Switch should be set with instrument powered off. Dip-Switch settled in reserved positions acti-
vates FAULT Led indication (see “Operational Description > Faults”).
Important:
Once installation is completed,
power up the unit, wait about 30 to 60 minutes and then to adjust the
sensor to the environment, only if it is necessary,
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
Fig. 4
.
The max load resistor is 50 ohm with 12Vdc power supply, while is
400 ohm with 24Vdc power supply.
We suggest using 24Vdc power supply.
WARNING
Average life
: In clean air and in normal working condition the
sensor's life is
about 2 years.
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 6 or 12 months. Tests, Zero Adjust and Calibration
with sample gas bottle, as explained in the next chapter “
Tests and Calibration
”.
Note:
the detector is not able to detect gas leaks occurring outside the room where it is installed, neither inside
walls or under the floor.
Sensor operating limits:
the electrochemical cell, in any case, should not be exposed to temperatures lower than
-40°C or higher than 60°C. The electrochemical cell can be damaged, if it is exposed to concentrations over the
limit specified in the table, depending on the model. If this condition occurs, please replace the “
Cartridge Sensor
”.
SE137EA
SE137EA-H
SE137EC-S
SE137EC-H
SE137ES
SE137EH
SE137EHCN
SE137EN
SE137EN2
SE137EHCL
SE137ECL
500ppm NH
3
1000ppm CO 150ppm SO
2
500ppm H
2
S 100ppm EHN 1000ppm NO 150ppm NO
2
>30ppm HCL >50ppm CL
2
Safety:
electrochemical Cell contains a small quantity of acid. It is possible that either a very strong mechanical
action or an incorrect instrument use beyond the limits of its operational functioning could provoke a liquid leak out
of the sensor. Should this event occurs, please avoid touching the come out liquid. Should a contact with either the
skin or eyes occur, wash immediately and abundantly with water.
Cross sensitivity to other gases:
this detector is designed to detect gas leaks at a very low concentration. The
electrochemical cells employed have a good resistance towards products such as sprays, detergents, glues and
