System Status - Prosense PC3 Series Installation And User Manual

The Fault relay is set to NO (Normally Open – Energised) and energised. Hence fault relay
LED is always active. It does not mean that there is a fault on detector. If the power LED is
active and fault LED is off it means that there is a fault condition on the detector. The fault
relay will be de-energized in case of power failure.
The alarm relays set to NO (Normally Open – De-Energised) position at factory.
The alarm levels are also adjustable via using SW1 and SW2 alarm level pins. Alarm levels are
defined as percentage in LEL for flammable gases. The alarm levels can be adjusted using
jumpers to switch SW1 and SW2. Possible options are given in table 9:
Oxygen Detectors:
For oxygen detectors the output values and meanings are different as oxygen is naturally
available in atmosphere:
Port Usage
Fault Fault Relay output
AL1 Alarm 1 Relay output - Lower level for Oxygen
Alarm 2 Relay output - Higher level for Oxygen Non-Energised
AL2
Alarm levels are also different as given in below table:

System Status

The Prosense PC3 detector has two LEDs on main board. Red LED shows system power status
and yellow LED shows fault status. Both LEDs will be illuminated right after applying power.
After approximately 90 sec the yellow LED will be turned off and only red LED will continue
blinking. This status means that detector is ready to normal operation. Detector will provide
PRS-UM-PC3-EN-Rev.04-06.2020
SW1 SW2
Open Open
Open Closed
Closed Closed
Closed Open
Table 9: Alarm level pin positions
Table 10: Relay module output meanings for Oxygen detectors
SW1 SW2
Open Open
Open Closed
Closed Closed
Closed Open
Table 11: Alarm level (% Vol) pin positions for Oxygen detectors
Al1 Level Al2 Level
10 LEL 15 LEL
10 LEL 20 LEL
20 LEL 25 LEL
20 LEL 40 LEL
Energy
Energised
Non-Energised
Al1 Level Al2 Level
19 %vol 23 %vol
19 %vol 22 %vol
18 %vol 22 %vol
18 %vol 23 %vol
Contact
NO
NO
NO
17