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Alarm Unit - ALU

Technical Section

                                                                     To Add                 To Add

       Unit                                                Customisation    Customisation

Description                    Order Code       Option 1             Option 2

(Example - An ALU 4 with customisation option 1 = 16.002A)

2 Channel Unit  ALU 2 -       16.001                A                   B

4 Channel Unit  ALU 4 -       16.002                A                   B

6 Channel Unit  ALU 6 -       16.003                A                   B

 Wallmount Kit is Included, Extra Wallmount Kit - 10.002

Additional Mounting Options

Cassette Mounting System - 09.012

Space Saver Cassette Mounting System - 09.013

If a Cassette is ordered we will be in touch to ask if there are 

any retrofit bracket requirements with your order.

Our Technical Pages have been enhanced and optimised for Mobile Phone compatibility, this is to allow installers to easily be able to follow our installation procedures on site if required

Electrical Supply

AC Range - 85 to 264V @ 47 TO 440 Hz

AC Current (Typical) 0.03A/230V AC

Designed Electronics Products are Ultra Low Power

Ultra Low Power

Fuses  (Located on PCB)

   24V DC Supply Fuse (F1) - 630mA  20 x 5mm Thermal

Internal Mains Supply Fuse (F2) - 2A  20 x 5mm Thermal

Digital Inputs (Non Isolated)

Supply Voltage (provided by ALU) +24V DC

Input Current at 24 V DC 7.7 mA

Inputs compatible with normal dry contact switches, PNP / NPN and NAMUR specification inductive proximity switches.

Digital Outputs (Dry Contact Volt Free)

Current Rating       0.5A @ 24V DC​

Enclosure

Material  -  ABS

Rating  -  IP65

Dimensions - 271 x 120 x 170 mm

Colour  - Light Grey RAL 7035

Mounting Holes - Accept 4 x M4 screws

ALU is Supplied with a Wall Mounting Kit

Optional Cabinet Mounted Cassette System Available - CLICK HERE for more information.

Design Compliances

Designed in compliance with

  • BS EN 60204-1:2018 Safety of machinery. Electrical equipment of machines

 

Tested and FULLY compliant with 

EN 61326-1:2021 Electrical Equipment for Measurement Control and Lab Use - EMC Requirements.

EN 55011:2016+A2 Conducted RF Emissions

  • EN 55011:2016+A2 Radiated Emissions

  • EN 61000-4-2:2009 Electrostatic Discharge

  • EN 61000-4-3:2006+A2 Radiated Immunity 80 MHz to 6 GHz

  • EN 61000-4-4:2012 Fast Transient and Burst Immunity

  • EN 61000-4-5:2014+A1 Surge Immunity

  • EN 61000-4-6:2014 Conducted RF Immunity

  • EN 61000-4-11:2020 Mains Dips and Interruptions

  • EN 61000-4-8:2010 Power Frequency Magnetic Field Immunity

Mounting  (with included Wall Mounting Kit)

ALU Wall Mounting Dimensions
ALU Wallmounting Dimendions

Connecting Digital Inputs

The ALU is supplied with Blanking Plugs fitted to maintain sealed integrity, A separate cable gland is supplied for each Digital Input which can be found inside the monitor.

1 With a flat bladed screwdriver insert it into the gap on the right hand clip as shown and either twist or lever the screwdriver to the right to open the clip and you will find the cable glands. 2 With an appropriate screwdriver remove the required blanking plug and using the same seal and nut fit the cable gland 3, Repeat the procedure to accommodate the amount of Digital Inputs you require

2

ALU how to Install a Cable Gland

DO NOT remove a blanking plug and fit a cable gland if it is not required as this will result in loss of sealed integrity and may invalidate your warranty.​​

ALU Digital Alarm Monitor New
How to Open an ALU Monitor

1

Designed Electronics ALU Cable Glands

 Inside you will find the cable glands.

If for any reason the cable glands are missing please contact your supervisor or your installer.

ALU How to Install a Cable Gland

3

As you will now be wiring your Digital Inputs this may be a good time to decide which Input you want to wire to which Channel as you should be aware that if you require a time delay on an input before it activates this MUST be wired into Channel 2 Only (1 to 10 seconds adjustable)

It may also be useful to fill out a Configuration Sheet for your future reference and also to mark/label your input cables for easy identification, You can download and print an ALU Configuration sheet HERE or from our Downloads page for you to fill out and print or print and fill out to save or file for your future reference.

The cable from the Digital Input device should be passed through its cable gland and terminated into its corresponding connecting plug in the circuit board​​

Feed your Input Cable

through your Cable Gland

1

Designed Electronics ALU Connect an Input

2

We recommend that you

crimp wire ferrules or

bootlace ferrules to the

bare wires

ALU Monitor how to wire Inputs
ALU How to prepare Input Wires

5

Plug your wires back into the

socket and tighten the Cable Gland

ALU Wire Sensor Inputs

Unplug your required

green Input plug

3

ALU How to Unplug Input Plug

Wire your 2 wires into

your green Input Plug

(I/P and +24v) as marked on the PCB

4

ALU How to Connect Input Wires

If you have a 3-wired device and are unsure how to 

establish which 2 wires you need then please use 

our simple guide to identify which wires you need 

for the correct operation

Which can be found HERE

BSI Member
Registered with the Environment Agency
Fully RoHS Compliant

Designed Electronics Ltd

Registered in England and Wales,  Company number 10713415

Chapelfields, Coventry, England​.   VAT Registration number 438526966

© 2025 by Designed Electronics Ltd. All rights reserved.

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