IST-2138.EC01.01/C
Istruzione / User’s Manual / Manuel d’utilisation
Pag.9/18
TECNOCONTROL S.r.l. - Via Miglioli, 47 20090 SEGRATE (MI) ITALY
Tel. +39 02 26922890 - Fax +39 02 2133734
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
”.
SE138EA - SE138EA-H
SE138EC-S - SE138EC-H
SE138ES
SE138EH
SE138EHCN
SE138EN
SE138EN2
500 ppm NH
3
>1000 ppm CO
150 ppm SO
2
500 ppm H
2
S
100 ppm EHN
1000 ppm NO
150 ppm NO
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
paints.
However, in case of products containing substances in great quantity, these could interfere with the Sensor
and cause false alarms.
We recommend ventilating the room when products like these are used. Alcohols, Hydro-
gen and volatile organic solvents in great quantity cause false alarms, and then the cell needs one or more hours in
clean air to recover the normal sensitivity conditions.
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 increase mA output causing the activation of connected alarm devices.
Operation Check, Zero Adjust, and Calibration
:
are different code protected functions. To access these func-
tions is necessary to insert the relevant “
Code
" through the keys F1s and F2. To have the key pressure recog-
nized, hold pressing it for around a second (
until the green Led doesn't switch off for a moment
). Then the next key can be
pressed. In case of error all it takes is waiting around 10 seconds and the sequence is automatically erased.
The
Calibration Check
is a function code free.
Calibration Kit, Sample Gas Bottles
(
for Calibration Check and Calibration
) the mixture to be used depending on the
model installed is shown in the table below:
MODEL
Sample gas bottle
Tecnocontrol Code
SE138EA - SE138EA-H
100 ppm
Ammoniaca (NH
3
)
in
Nitrogen
Available on request
SE138EC-S - SE138EC-H
300 ppm
Carbon monoxide (CO
)
in
Nitrogen
BO210
SE138ES
10 ppm
Sulphur dioxide (SO
2
)
in
Nitrogen
Available on request
SE138EH
50 ppm
Hydrogen sulphide (H
2
S) in Nitrogen
Available on request
SE138EHCN
10 ppm
Hydrogen cyanide (HCN) in Nitrogen
Available on request
SE138EN
100 ppm Nitric oxide (NO)
in Nitrogen
Available on request
SE138EN2
30ppm
Nitrogen dioxide (NO
2
)
in air
Available on request
It is possible to use either the
disposable cylinders with adjust valve
or the high pressure ones with reduction gear.
Is also necessary the
Tecnocontrol calibration kit model TC011
. To ensure that the gas concentration reaches
sensor, use steel reduction gear and Teflon tubes or other compatible materials which do not disperse the gas.
“INSTRUMENT OPERATION CHECK” (
Check Code
: F2, F2, F1, F1)
:
this function allows to effect a functional test
of the detector. After having inserted the "
Check C
ode
", all Led are switched off and all the relays are deactivated.
Then they will switch on in sequence, the Led, from the yellow up to the 3° red. To the lighting of the various Led it
corresponds the activation of the relevant relays (
relay "FAULT" with the yellow Led, relay "ALARM1" with the 1° red Led, relay
