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Service & Maintenance of Hochiki Smoke Detectors and Sensors Technology Guide

Hochiki Europe offers assistance in Detector Servicing in the form of a Cleaning & Recalibration service for both conventional and analogue smoke and ionisation point detectors and sensors, ensuring the maximum life expectancy, correct response to fire and false alarms are minimised. See chart (right) and the "Servicing Processes by Product" section for details of our servicing processes. We recommend that detectors/sensors are returned to be serviced if in-situ testing shows the device's response to be inadequate, if a visual inspection reveals heavy contamination or if local legislation stipulates it. Any quantity of devices can be returned to our UK headquarters at Gillingham to be serviced, simply contact our Sales Department, or your Hochiki Representative for free advice (see back page for contact details). All devices serviced by Hochiki Europe (UK) Ltd are subject to a 12 month warranty against product failure.


conventional analogue





Servicing Processes by Product

The processes employed by the Hochiki Europe Service & Maintenance Department are dependent on the age and type of detector/sensor. The chart (right) shows each device type and model number and the corresponding servicing process indicated by the letters A, B, C, D and E.



Acceptance, Disassembly, Manual Clean, Mechanical Clean, Ultrasonic Treatments, Oven Dry, Reassembly, Test, Calibrate (if required), Age and Repackage.



As for A except Ultrasonic Treatments.


As for A except Ultrasonic Treatments, Mechanical Clean, Oven Dry.



As for A except Calibrate


As for A except Ultrasonic Treatments, Calibrate


BS 5839 : Part 1 - Maintenance

According to British Standards concerning the regular servicing of detectors, "to give greater assurance of reliability, correct servicing is essential. Normally an agreement should be made with a manufacturer, supplier or other competent contractor for regular servicing" The standard also identifies the following key points regarding the servicing of fire detection devices (please note, the following information is an overview only and should in no way replace the actual standard - available from BSI, see back page for contact details). It is important to ensure that operation during testing does not result in a false alarm of fire. It is essential that routine tests are adequate to ensure that the requisite degree of sensitivity to fire is maintained. If it is found that the sensitivity of detectors is adversely affected by the rapid accumulation of dirt, then arrangements should be made to increase the frequency of the inspections. Routine tests of operation (of heat detectors) should be carried out as recommended by the manufacturer, with at least 2 % of the installed heat detectors operated annually by the application of a heat source as a check on reliability. Care should be taken during the maintenance of systems in which the detector is itself coded (addressable devices). False information in respect of the origin of alarm could occur if individually coded detectors were exchanged. Each device is booked into the Hochiki Servicing system, and it's unique serial number is recorded. This number is used to verify the date of manufacture and to track the progress of the device through the servicing procedure.

The device is carefully dismantled, separating the electronic components from the plastic casing. Each part of the detector is cleaned differently.

Finally the devices are relabeled (if required) retaining their unique serial numbers, then repackaged ready to be dispatched back to the customer.

The above statements refer to UK legislation only. Customers not using UK regulations should refer to their local standards.

When the testing and recalibration has been finalised the devices are placed on Ageing Racks. Here they are connected to bases and powered up as though they were connected to a fire alarm system. They are continually monitored in this state for a minimum of 12 hours to determine their reliability.

If the plastic casing is heavily contaminated it is manually cleaned to remove the majority of pollutants before being mechanically washed in a detergent solution.

The electronics are cleaned using an ultrasonic cleaning tank. This equipment gently removes any built-up deposits of dirt and dust using ultrasonic pulses to vibrate the components. The deposits are drawn to the bottom of the tank where they are collected and disposed of.

Once the cleaning process is complete both electronic components and plastic casings are rack-dried within an oven dryer.

Once reassembled conventional smoke detectors are tested and calibrated employing a smoke tunnel. This machine consists of several chambers each filled with varying densities of smoke. The detectors are calibrated to respond correctly to each density.

Analogue ionisation detectors are tested and calibrated on a specially constructed function testing rig, where their response to inputs is measured and, if needed, adjusted electronically.

*For details of other servicing processes refer to chart on front page.

Smoke Chamber Replacement for ALG-E/SLR-E/SLR-E3

If the wire mesh smoke chamber cover in a photoelectric smoke detector or sensor gets heavily contaminated with large particles such as dust, soot etc this could compromise the sensitivity of the device. In these instances Hochiki Europe recommends replacing the smoke chamber cover rather than attempting to clean the mesh. However, if the whole of the device including the detection elements is contaminated, the device should be returned to Hochiki Europe for servicing. To replace the smoke chamber cover, follow these steps: The detector/sensor is constructed as two halves, the device itself and its outer cover. You will need to separate these halves to access the smoke chamber cover . Turn the device over - you will see four locking tabs (see fig 1). These hold the two halves together. You will need an OUTER COVER REMOVAL TOOL available from Hochiki (Part No. O/C ALG/SLR). Place the removal tool over the base of the device so that the two cut-outs sit over the metal terminals. Turn the removal tool clockwise until it stops. The removal tool has released all four clips. Now you can pull the two halves of the device apart, exposing the smoke chamber cover. The chamber cover (see fig 2) can be removed by twisting it anti-clockwise until it clicks. It can then be carefully lifted off from the device. Fit a new replacement chamber cover by first aligning the arrows on the cover itself and the base. Carefully lower the cover down onto the device and then secure by twisting clockwise until it clicks.


fig 1

fig 2

The two halves of the device can now be joined back together. Look for the two sets of ridges on the device itself and align with the two sets of corresponding grooves on the outer cover (see fig 3). Simply push the two halves together until they snap tight. The outer cover is now locked onto the device.

A Smoke Chamber Replacement CDROM e-Guide is available to order from our website at

fig 3

Useful Contacts


Hochiki Europe (UK) Ltd - UK Sales Department Hochiki Europe (UK) Ltd - Export Sales Department The British Standards Institute [email protected] [email protected] +44 (0)1634) 260133 +44 (0)1634 260133 +44 (0) 207 8996 9000


Gary Craig - General Manager UK Sales Richard Clifford - Sales Manager for South West Bill Longmuir - Sales Manager for South East Graham Lowe - Business Development Manager and Sales Manager for the North David Brown - Sales Support Supervisor Mark Jones - Sales Support Engineer [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] (07831) 710302 (07831) 710301 (07831) 710300 (07831) 322246 (07974) 572447 (07980) 238829

Quality System Certificate No. 164 Assessed to ISO9001 Environmental Management System Certificate No. EMS 286 Assessed to ISO 14001 : 1996 Hochiki Europe (UK) Ltd. reserves the right to alter the specification of its products from time to time without notice. Although every effort has been made to ensure the accuracy of the information contained in this document it is not warranted or represented by Hochiki Europe (UK) Ltd. to be a complete and up-to-date description.

Hochiki Europe (UK) Ltd, Grosvenor Road, Gillingham Business Park, Gillingham, Kent ME8 0SA, UK Tel : +44 (0) 1634 260133 Fax : +44 (0) 1634 260132 email : [email protected]

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