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Pag. 22
1.3 Technical specications
Table 2) Technical specications of SMART3G gas detectors
Sensing element Pellistor, IR sensor or Electrochemical cell
Measurement range Flammable gases: 0-100% LFL
Toxic gases:
Predicted sensor lifetime Pellistor: 4/5 anni
Electrochemical cell: 2/3 anni
Infrared sensor: >5 anni
Power supply 12-24 Vdc (-20% + 15%)
With pellistor: 33mA (46 mA in display version)
With electrochemical cell: 23mA (35 mA in display version)
With infrared sensor: 77mA (89 mA in display version)
Control unit Microprocessor 10 bit
Watch-dog Internal and external for the microprocessor status control
Visual indications Flickering LED; Display version with 9 smart LEDs and 4 digits
Proportional output with
pin 5-6 of JP9 closed
4-20 mA (default)
3 mA under scale alarm
2 mA fault
Proportional output with
pin 5-6 of JP9 open
4-20 mA
2 mA fault
22 mA overrange alarm
Max load resistance 200 Ω
Serial outpur (optional) RS485 for MULTISCAN++ and SENTOX IDI
Relay outputs, with ST-
S3REL board (optional)
3 relays with tension free changeover contact 24V-1 A (non-la-
tching relay)
Auto zeroing routine Zero drift compensation
Digital lter variable average on the sampled values
Repeatability from ±2% to ±5% FS (depending on sensor type)
Accuracy from ±2% to ±5% FS (depending on sensor type)
Warm-up time <120 s
Stabilization time 60 minutes
Response time (t90) < 60 s
Storage temperature Pellistor or infrared sensor: -40 / + 85 °C
Electrochemical cell: 0 / 20°C up to six months
Operatin temperature:
Operating humidity:
See instrument label
20-90 % Rh / 40° C (5-95% RH non condensing, on request)
Cable entries 2 x M20
Weight From 960 g to 1300 g (depending on model)
Dimension 106 x 190 x 62 mm
Positioning The sensor head must be mounted downward
EMC Reference standard EN50270:2015
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