Crowcon Sensitron PL4+ Gas Control Unit
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Crowcon Sensitron PL4+ Gas Control Unit
The PL4+ is a cost-effective solution for the detection of flammable, toxic and oxygen contents in small systems.
This panel provides 4 analogue 4-20 mA inputs that can be upgraded to 8 by using the PL4/ESP 4-input expansion module. This extension board offers 4 additional inputs and 16 electrical Open-Collector outputs, which can be converted into relays with the 16-relays board.
The control panel comes complete with 5 relays, one for each one of the 3 thresholds, 1 for fault and 1 programmable.
The LCD display accurately indicates the measured gas concentration and alarm set points. Mode status LEDs visually indicate alarm levels, fault and power-on. An internal buzzer is provided for an audible alarm in case of alarm or fault. It can be manually silenced with a front panel button.
The PL4+’s ABS cabinet is rated to IP65 and can accommodate a 12 VDC, 7Ah additional battery to ensure it works correctly when the power supply fails.
Order Information
| Part Number | Description |
|---|---|
| STPL4+ | 4-channel, triple threshold microprocessor-based gas control panel with LCD display, IP65-rated enclosure, 12V 1.5A enclosed power supply, and 5 output relays. Accepts 4-20 mA analogue signals. Expandable up to 8 inputs using STPL4/ESP. |
| STPL4/ESP | 4-channel extension card used to expand the PL4+ control panel with 4 additional channels. Also provides 16 additional Open Collector Outputs. |
| STG/16REL | 16-relay card compatible with MULTISCAN 8+ and STPL4/ESP to provide additional 16 relay outputs. *External enclosure not included. |
| Electrical data | |
| Power supply | 100 – 230 Vac (-20% / +5%) 50Hz |
| Back-up battery | 1 x 12V 7A/h (Optional) |
| Output supply | 13.8 Vdc |
| Inputs | 4 analogue 4-20mA inputs, can be upgraded to 8 by using the PL4/ESP module |
| Outputs |
5 relays: 3 associated to alarm thresholds, 1 to fault and 1 freely programmable With PL4/ESP board 16 O/C outputs are available, convertible into relays with the 16REL module |
| Absorption | 40 mA at 220 V (without connected battery and optional modules) |
| Fuses |
2A delayed, on the main power supply 3A delayed, on gas detectors power supply |
| Relays contact ratings |
10 A at 250V relays of the board panel 6.0 A at 250V relays of 16REL module |
| Functionalities | |
| Operating modes |
3, set with the key on the front panel: – System ON – System OFF – System in programming mode |
| Visual indications |
LCD display 2raws x 16columns 7 status LEDs: 1 green for the power supply, 2 yellow for low battery supply and fault, 4 red for alarms and auxiliary output |
| Acoustic indications | Buzzer 70db at 1m |
| Front panel buttons | Keyboard with two buttons (ACK and reset) |
| Environmental conditions | |
| Storage temperature | -20 / +60°C |
| Operating temperature | 0 / +50°C |
| Operating humidity | 15 / 85% RH non condensing |
| Box | |
| Material | ABS |
| Dimensions | 426 x 288 x 148 mm |
| Weight | 3.4 kg without battery |
| IP Grade | IP65 |
| Compliance | |
| EMC | EN 61000-6-3:2007 + A1:2011; EN 50270:2015 |
| ATEX |
ATEX Directive 2014/34/UE EN IEC 60079-0:2018 EN 60079-29-1:2016 |
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