ENGLISH
Pag. 19
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Once the installation has been completed, verify that each detector reaches at least
12 Vdc.
3.3 Connection analogue output (only in 12-24 Vdc version)
The default configuration provides a 4-20 mA proportional output. Wiring between the de-
tector and the control panel should be carried out taking into account the following:
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Use shielded cables.
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Wires’ cross section depends on the distance between the control panel and the detec-
tor: for a distance up to m 100 we advise a 3-core wire with cross section area of 0.75
mm2; for a distance between m 100 and 200 we recommend a 3-core wire with cross
section of 1.0 mm2; for a distance between m 200 and 300 we recommend a 3-core
wire with cross section 1.5 mm2.
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Should any junctions be necessary on wires, please make sure there is no interruption
on the shield.
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Please remember that the shield is to be grounded from the control panel side only.
Also remember never to connect the shield to the detectors.
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Ensure the wire connections, either clutching or crimping type, are properly carried
out with terminals that do not oxidise or loosen. We recommend having them solde-
red.
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The SMART3-R gas detectors can be connected to control panels available on the mar-
ket having 4-20mA input signals.
3.4 Remote head connection
The remote head is supplied with the 6-conductor cable already crimped, it must be con-
nected to the base-board of the SMART 3-R detector. Open the detector box by unscrewing
the 4 screws on the front side and connect the 6-conductor cable to the connector shown in
Figure 4. Pass the cable through the cable gland in the caseunderside.
4. Testing, use and maintenance
4.1 Power ON
When the detector is powered on, the LEDs start blinking yellow during warmup time. After
one minute, the LEDs remain green during normal status.
Once the warm-up phase is over, the detector can work correctly, although the optimal per-
formances will be achieved after two hours.
4.2 Testing
Detectors are factory calibrated for the specific gas required by the customers. Future adjust-
ment of the preset calibration can be carried out by employing the calibration keypad. Te-
sting should be carried out by using a gas mixture in the appropriate range, along with our
Summary of Contents for SMART3-R Series
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