Key Features
EN54-20 approved
4 or 6, addressable pipe air-sampling
Area coverage up to 2000m2
0.001% to 20% obscuration/m
4 Alarms - Alert, Action , Fire 1, Fire 2

Product Discontinued

This product has now been discontinued.

Please note: spares for EF-FT4/6 Aspirating Smoke Detectors are still available and part numbers can be found below.


The EF-FT4 and EF-FT6 detectors are multi-channel large bore air-sampling systems with an alarm sensitivity range from 0.001% to 20% obscuration/m. These detectors are classified as a Very Early Warning Smoke Detector and can reliably detect fire at an early stage at low to high concentrations of smoke. As a multi-channel system, the FT4/6 detector is able to divide a protected space into sampling sectors, enabling the localisation of a fire for faster incident response.

The detectors are configurable for a variety of environments, providing an ideal fire detection solution for power stations, telecommunications and IT facilities, clean rooms, warehouses, cold storage, harsh and hazardous areas, museums, prison cells, and technical cabinets.

How it Works

The FT4/6 detector draws a combined air sample from all sectors in the protected area, then filters and analyses the sample in a laser detection chamber. When smoke particles are detected and the smoke level reaches a TRACE alarm threshold, the system will sequentially scan the sectors via the rotary valve to identify the sector, or sectors with the smoke condition. Alarm states (Alert, Action, Fire 1, Fire 2) are shown on the display and communicated to a host fire alarm control panel.

Product Features

Programming and Configuration

The four alarm levels are available for each channel and the sensitivity thresholds and delays for each of these can be individually programmed per sector. The detector provides a simple and comprehensive display that includes an LED array to show the measured smoke level for the currently selected pipe, and an on-board programmer for local configuration.

RS485 interfaces allow connections to programming devices and remote displays, and the TCP/IP Ethernet interface can provide access to an email messaging service.

Inputs and Outputs

There are 5 relays as standard and the system is expandable, supporting several optional modules, which provide the detector with additional programmable output relays or 4 to 20mA analogue outputs.

Aspiration and Flow Sensing

The aspirator is a 2000 Pa, high pressure and high volume fan, which provides superior detection times over long pipe lengths and reliable detection in high air-flow environments. Airflow in each pipe is monitored by a dual element thermal sensing system, with airflow faults indicated on the display and remote monitoring equipment.

Additional Features

  • 4 or 6 x 100m (max) sampling pipes
  • 5 relay outputs as standard with optional expansion




-Class A (20 holes / 0.05% obs/m)

-Class B (48 holes / 0.06% obs/m)

-Class C (72 holes / 0.10% obs/m)


-Class A (30 holes / 0.05% obs/m)

-Class B (72 holes / 0.06% obs/m)

-Class C (72 holes / 0.10% obs/m)


Tech Specs


Sampling Pipe Inlets

4 or 6 (max)


Integrated mass particle detection nephelometer

Sampling Pipe

1 to 4 or 1 to 6, 25mm or 3/4” nominal bore

Sampling Pipe Length

100m (max) per pipe. Verify using Aspire 2

Exhaust Air Pipe

(25 mm or 3/4”)


Supply Voltage

Nominal 24Vdc (18 to 30Vdc)

Operating Current

500mA to 1.4A max (fan speed dependant)


LCD, calibrated LED bargraph, multiple condition/status indicators


Local and/or remote


Panel front, remote membrane and/or RS232 PC connection

Relay Outputs

5 common as standard. Expansion possible

Flow Monitoring

Differential pressure sensor. Twin thermal element

Cable Terminals

Removable, rising clamp, 2.0mm2 wire maximum


Operating Temparature

-10 to +60°C

Recommended Det. Amb.

0 to 39°C

Operating Humidity

10 to 95% (non condensing)

IP Rating




0.001 to 20% obscuration per metre


2000 Pa centrifugal air pump

Alarm Levels

4 - Programmable per pipe/channel (Alert, Action, Fire 1, Fire 2)

Alarm Delay

1 - 60 seconds


RS484, RS232, MODbus, Ethernet TCP/IP


Field exchangeable dual stage

Housing Material

Galvanised steel back chassis with ABS outer cover


Upright with batteries fitted. Horizontal possible without batteries



Dimensions (W x H x D)

490 x 355 x 200mm

Part Codes

EF-FT4-DT 4 addressable pipe, 24Vdc, display/programmer, TCP/IP
EF-FT6-DT 6 addressable pipe, 24Vdc, display/programmer, TCP/IP
01-EP02-02E Internal mains psu/charger, 230Vac (optional)
28-002 4A True Load, Power Supply, 24VDC, 96-264V AC (EN54-4) 17AH Max
VPS-250-E External 5A PSU with Charger - EN54 Approved
02-FL53 Replaceable internal filter - coarse
02-FL56 Replaceable internal filter - fine



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