Andel Floodline DD-14 Installations- und Betriebshandbuch - Seite 3
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Introduction
The Floodline DD-nn digital gas detector is designed to continuously monitor for the
presence of the specified gas. They are designed to be installed in hotels, offices,
public buildings etc. When the set concentration values are exceeded, the detector
generates a visual / audible alarm and changes the state of the output relay within the
DD-nn detector.
The unit also has RS-485 network capabilities for connection to the Floodline MDD-
256/T gas detection system which gives more detailed alarm information. Each sensor
has 3 alarm levels A1, A2 and A3 set at different levels depending on the type of gas
being detected.
The detector has a removable module with an intelligent semiconductor sensor, which
facilitates maintenance and lowers operating cost.
The sensor is available to detect 5 gas types which are defined by the 'nn' number of
the device, the table below gives details for these codes and the A1 to A3 alarm levels.
The code number is clearly marked on the removable detection module.
Code Number
Detectable Gases
DD-11
Natural Gas/CNG, other hydrocarbon
A1= 10%, A2 = 20%, A3 = 30%
DD-14
Natural Gas/CNG (selective to CH4)
A1= 10%, A2 = 20%, A3 = 30%
DD-15
Propane/butane/LPG, other hydrocarbons
A1= 10%, A2 = 20%, A3 = 30%
DD-22
Carbon monoxide (CO)
A1= 20ppm, A2 = 100ppm, A3 ≥ 250ppm
DD-61
Chlorofluorocarbon (HFCs)
A1= 1000ppm, A2 = 2000ppm, A3 = 2500ppm
The main features of the detectors are:
• Long life, semiconductor gas sensor
• Ease of installation and connection (detachable terminals)
• RS-485 port (isolated) with Modbus RTU protocol (for connection to MDD-256)
• 3 Standard alarm thresholds (A1, A2, A3 factory set)
• Relay output (set for A2 threshold as standard) NO/NC type (switch up to
30Vdc)
FLD DD Gas Sensor 22.03.2022 Rev.0
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