P81 General features
Light signals:  1 red LED, power supply ON; 1 yellow LED, failure; 1 red LED, gas alarm.
Acoustic signals: 1 buzzer with sound intensity > 60db at 1m
1 button to reset the alarms and for testing the probe.
Self-extinguishing plastic housing.
Dimensions: 105 x 90 x 58 mm – 6 modules complies with DIN 43880 standard.
Unit weight: 0.185 kg.
Rear panel mounting on Omega DIN EN 50022 rail.
Protection: IP20; IP40 when is properly installed in an electrical box.
Environment temperature: 0 ÷ 50 °C.
Environment humidity ±90% U.R. without condensation.
Electric features
Power supply: 12 Vac/dc ± 10%.
Absorption: approximately 160mA (320mA) with a single probe; 460mA (620mA) with faulty probe and output.
Connection with 2 terminals of 2.5 mm².
Protection: input – fuse power supply 1A 5x20mm.
1 input for sensors S81, S82, S83, or probes ATEX S84, S85, S86 (different gas types).
Connection to the probe with 3 terminals of 2.5 mm²: C (-12…24V); S (+4…20mA); A (+12…24V).
Maximum connection length 50 m.
Section of 3 conductors: 1.5 mm².
Alarm output: n.1 relay with 1 SPDT contact 8A 250Vac.
Failure output: n.1 open collector 12Vdc / 300mA max.
Outputs connections: n.3 terminals of 2.5 mm² for relay C-NC-NO; n.2 terminals of 2.5 mm² for open collector.