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Andel - Leak Detection - System Design Guide

FLOODLINE - Refrigerant Gas Sensor - Detection Cables - Leak Detection


The Andel “FLOODLINE” range covers all possible requirements, from stand-alone single zone modules and units for the smaller installation, to comprehensive multi-zone systems.

With the capacity to handle the largest building offering outstanding flexibility, with a range of equipment and sensors to tailor each installation to the client's exact needs.

Sensor Selection:

Choosing the best sensor to suit the application and the areas to be monitored:

Multi-8 Zone Detection Cable

Within raised floor voids in data centres, comms/server/IT rooms, tea points and vending areas, drip trays, A/C units and underfloor pipework.

Multi-4 Zone Detection Cable:

Attach along the full length of high level pipework especially above critical/sensitive areas.

Point Sensor:

Plant rooms, tank rooms, trenches, small drip trays, base of lift shafts, toilets and showers.


Pipe joints and junctions, plumbed in water coolers and inaccessible areas.

Pipe-in-Pipe Sensor:

Double containment water pipework and tanks and high level alarm.

DP01 Double Containment Sensor:

Double containment oil/diesel pipework and tanks, either along full length or at lowest point.

Oil Sensor:

Bunded oil storage tanks, generator rooms and oil pipework trenches.

FGS1000 Refrigerant Gas Sensor:

Office areas served by VRF/VRV units, in chiller plant rooms, along refrigerant gas pipework routes.

System Layout:

Choosing the best design for optimum coverage with the most suitable sensor:


Install Multi-8 Zone Detection Cable in the raised floor void attached to the floor slab approx. 500mm in from the wall.

Whole Floor Area:

Install Multi-8 Zone Detection Cable in the raised floor void across the whole floor space at 2m centres.

A/C Units/Downflow Units

Install Multi-8 Zone Detection Cable either around the ‘footprint’ of the unit or ‘zig-zagged’ directly beneath.

Low Level Pipework in Floor Void:

Install Multi-8 Zone Detection Cable beneath the pipework within the floor void in a ‘serpentine’ pattern along the full pipe length.

High Level Pipework:

Attach Absorbent Multi-4 Zone Detection Cable to the underside of the whole pipe length outside any lagging.

Plant Room:

Install Point Sensors either at equidistant positions around the room or targeted at specific items of equipment e.g. Pump Sets, Water Tanks, etc.

Double Containment Pipework:

Install DP01 Pipe-in-Pipe Sensor at equidistant positions along the full pipe lengths – usually 10-15m apart or at the lowest point if the pipework runs to a fall.

Refrigerant Gas

Within offices, install at mid level (approximately 1m from floor), preferably adjacent/near to VRF units. For Chiller Rooms, etc install every 6m³ across the whole area.

Control Panel Selection:


Up to 20m of Detection Cable in the raised floor void of one room, within a short length of drip tray, 1 - 3no Point / Oil Sensors, usually within the same room or 1no FGS1000 Ref. Gas Sensor.
- Floodline One Zone Control Panel - Volt free outputs for ‘LEAK’ and ‘SYSTEM’ fault.


20 - 300m of Detection Cable either within a single or multiple rooms, several A/C Units or separate Drip Trays and combination of between 5 - 50no Point / Oil Sensors in large Plant / Generator Rooms and 4 - 20no FGS1000 Ref. Gas Sensors, etc.
- Floodline 4 - 32 Zone Control Panels - Volt free outputs for ‘LEAK’ and ‘SYSTEM’ fault and individual zone output relays available.


Over 300m of Detection Cable either within a large area (data centre) or across many smaller room (server & comms rooms) and / or combination of Point / Oil / Ref. Gas Sensors.
- Floodline 128 System – 32 / 64 / 96 / 128no Zones – Volt free outputs for ‘LEAK’ and ‘SYSTEM’ fault, RS232 / 485 + MODBUS and individual zone output relays available.


Various options for connecting components, installing the Floodline sensors and control panels and adapting the system for each individual site:

Zone Couplers:

Start / Auto / End of Line – Using RJ48 connectors for ease of installation by simple ‘plug & play’ connectivity.

Junction Boxes:

For use with Multi–4 Zone Cable to connect from panel to the first zone and then between each concurrent or separate zone.

Leader Cable:

Full LSF – 0H interconnecting cable for use from the control panel to each individual or set of zones.

Remote Panel:

Provides audible and visual alarm at a secondary position i.e. at a reception desk or security office.

Caution Tags:

Usually fitted every 1 – 2m along clearly identifying detection cable.


Self–adhesive 6.3mm clips, or drilled & plugged ‘P’ clips usually installed every metre and every change of direction along the full length of the detection cable.

Click the PDF image to view the technical information in full

refrigerant gas, leak detection

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Dodworth Business Park South

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Tel: 01484 845 000
Fax: 01484 845 222

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