Gas detection probes certified with ATEX, 4- 20mA, for control units P81 and P82
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DESCRIPTION
General features0
Combustible gas detection probes, certified with ATEX II 2G Ex d IIC T6, to be used with the electronic control units P81 and P82.
The probes are available in 3 versions: S84 for methane gas and city gas, S85 for LPG and S86 for carbon monoxide.
- Sensor type: catalytic, standard.
- Measurement range 0…100% LEL.
- Sensor precision ± 5% of the probe scale, ± 10% of reading.
- Precision (semiconductor) ± 10% of full scale (the calibration point).
- Repeatability ± 5% of full scale, ± 10% of reading.
- Measurement resolution 1% LEL.
- Digital processing of Kalman filter measurement.
- Preheating time < 2m.
- Stabilization time < 2m.
- Maximum response time < 20s (T50), < 60s (T90).
- Average life time of the sensor in air 255 weeks.
- Environment temperatures:
– operating -20 ÷ 50 °C;
– storage -20 ÷ 70 °C. - Environment humidity without condensation:
– operating 15 ÷ 90 %UR;
– storage 45 ÷ 75 %UR. - Operating pressure (KPa) 80 ÷ 110.
- Air speed (m/s): ± 6.
- Optical signals – red LED visible on the powered probe.
- Dimensions: 164 x 100 x 82 mm.
- Unit weight 0.8 Kg.
Electric features- Power supply: 11 ÷ 28 Vdc.
- Absorption: maximum 3.2 W.
Output logic 4…20mA:
- proportional logic 4mA = 0% LEL; 0 ppm
(default) 20mA = 100% LEL; 500 ppm - absorption logic 0mA = no alarm
(applications with 1 or 2 thresholds) 10mA = 1st threshold alarm – 20mA = 2nd threshold alarm - reference selection
of the signal 4…20mA to 1/2 of jumpers with reference to power supply negative or positive signs
4…20mA output load resistance up to 200Ω at 12Vdc power supply and up to 200Ω¸ 700Ω at 24Vdc power supply
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