01040001 CTP21 3 Sensor Central detection unit IP54

Gas Detection » Central units, Commercial / Industrial
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The CTP21 is a wall-mounted gas detector. It can be connected up to 3 remote catalytic sensors for flammable gases calibrated for Methane (model ST441M) or LPG (model ST441G) rated to IP44. The CTP21 is rated to IP44.

The CTP21 is normally powered by mains, but can also be connected either to an external power supply at 12Vdc (e.g. to a buffer battery unit 12Vdc model PS175 or PS180).

On the front plate 3 vertical LED bars shows both the working condition and the gas concentration being detected by each sensor. The instrument has two alarm levels with sealed-type output relays, normally activated, with tension-free change over contacts.

When the gas concentration attains 10% LEL (illumination of the 3rd red LED), the 1st relay "ALARM 1" will activate. This relay is normally used as a pre-alarm for the controlling of a siren (model SE301A).

When the gas concentration attains 20% LEL, the 4th red LED will illuminate and after 30 seconds the second relay "ALARM 2" will activate.  This one is used for the gas shut-off by means of a solenoid valve and/or interruption of the electric energy. When the relay activates, the red LED "ALARM" illuminates, and the normal functioning will be attained by pushing the "RESET" button after removing the cause of the alarm.

For security reasons, the "RESET" button cannot operate when the sensor is detecting gas. When a fault sensor condition occurs, the third "FAULT" relay activates and the yellow LED of the corresponding channel illuminates.

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