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8. TECHNICAL SPECIFICATIONS
Product Gas detector, type ST450EC
Gas type Oxygen and Toxic gasses (O
2
, H
2
S, CO)
Sensor type Electrochemical sensor (2 or 3 electrodes)
Range Oxygen (O
2
), 0-25 Vol%
Hydrogen sulphide (H
2
S), 0-30 / 50 / 100 ppm
Carbon monoxide (CO), 0-500 ppm
Sensor life expectancy 6 ~ 26 months (depending on the sensor type)
Storage temperature -40 to +65°C
Display Digital graphic display with backlight
Status LED display Green: OK, Red: Alarm, Yellow: SF (System Failure)
Blue: Menu active
Power supply 17,5-24 VDC (max. 25mA)
Power consumption Max. 120 mA
Outputs 4-20mA (0-25mA), RS485 Modbus RTU
<2.4mA System Failure, >20 mA Over Range
Signal cable 2-wire shielded, 0,75 … 2,5 mm2
Cable gland Standard Brass, optional SS (screw-thread M20x1,5)
Cable size Cable gland (size 16):
Outer sheath: Ø max. 16 mm (incl. shielding)
Inner sheath: >l Ø l< 7 – 10 mm
Cable gland (size 20):
Outer sheath: Ø max. 20 mm (incl. shielding)
Inner sheath: >l Ø l< 10,5 – 13 mm
(Inner sheath is excl. shieling and outer sheath)
Load impedance max. 300Ω at 24 Vdc
Operating temperature ST450EC-O2 -20 to +55 °C
ST450EC-H2S -20 to +50 °C
ST450EC-CO -20 to +50 °C
Relative humidity ST450EC-O2 5 to 95% r.H. (n.c.)
ST450EC-H2S 15 to 90% r.H. (n.c.)
ST450EC-CO 15 to 90% r.H. (n.c.)
Pressure range Toxic: Atmospheric ± 10%, Oxygen: 80 to 120 kPa
Enclosure Aluminium with coating, optional SS
Dimensions 179 x 189 x 107 mm (HxWxD)
Weight 1,8 kg (Alu), 3,2 kg (SS)
Enclosure gas sensor SS 316, M20x1.5, Ex d, Ex t
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