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Hydra 256 Addressable car park gas detection system



Hydra 256 Gas Detection System

The Crowcon Hydra Addressable Gas Detection System is designed to monitor toxic and/or flammable gas hazards, particularly in car park applications.

Addressibility significantly reduces installation costs and makes savings through effective control of ventilation fans achievable, for example running fans at full power only when gas levels rise.


Hydra allows a connection of a maximum of 256 detectors to a single panel via addressable RS-485 loops.

Features include:

  • Able to control up to 256 remote outputs, all of which are programmable
  • Built-in relays can be used to indicate the system status remotely or provide control of auxiliary equipment
  • Modbus RTU output for connection to Building Management Systems (BMS)
  • Event log functions
  • Optional battery back up


Crowcon Hydra 256 Specifications

Size430W x 405H x 140D mm (16.9x16x5.5 ins)100W x 180H x 65D mm (3.9x7x2.5 ins)
Weight7.9Kg (17.4lbs)0.4kg (0.9lbs)
Enclosure materialPainted steelPainted alloy
Ingress protectionN/AIP55
Operating temperature0 to +55°C (32 to 131°F)-10 to +55°C (14 to 131°F)
Storage temperature-20 to +60°C (-4 to 140°F)
Humidity15-85%RH non-condensing20-90%RH non-condensing (RH @40°C)
Battery back-up2 x 12V 7Ah lead-acid batteries (optional)N/A
InputsUp to 256 addressable Hydra+ gas detectors. Two RS-485 buses supplied (max. 128 detectors), two extra buses may be addedN/A
Outputs3 x alarm relays (alarm level 1,2,3)
1 x fault relay
1 x power fail relay
1 x battery relay
1 x sounder relay
1 x test relaySPCO contacts rated 16A 230Vac
RS-485 Modbus
Addressable output modulesOne to four 16-way modules can be connected per RS-485 bus to provide up to 64 additional open-collector outputs, or up to 64 SPCO relays when used with 8-way relay modules. 256 outputs maximumN/A
Relays can be energised/de-energised, latched/non-latched, time-delayed, pulsed. Contacts rated 16A 230Vac
Digital communicationsRS-232 port for system configuration via a PC (software and lead supplied), or for Modbus communication to BMS/DCS/PLC systems.N/A
Event loggingUp to 1000 alarm, power, fault, system events are stored in NVM and on SD card.N/A
Panel indicationGraphic LCD
6 x red Alarm (alarm level 1,2,3)
2 x yellow Fault
2 x yellow Over-range
2 x yellow Under-range
2 x green Power/battery
2 x yellow Inhibit/test
Gases and rangesCO: 0-300ppm
NO2 : 0-20ppm LPG/Propane: 0-100% LEL
Sensor life4 years typical
ApprovalsEMC: EN50270, EN61000-6-3: 2001 + A11 (2004)N/A



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