EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 85
6.4 Cleaning
The EPD is a sealed unit and has protection against dust and low pressure jets of
water from all directions. The unit will not withstand prolonged immersion under
pressure. Cleaning should be carried out if the unit requires general cleaning, if the
EPD battery has leaked or if the unit has come into contact with radioactive
contamination.
6.4.1 General Cleaning
The unit should be cleaned with warm soapy water. Use a neutral water-based
detergent, other detergents may damage or attack the EPD’s outer plastic coating.
A small brush should be used to clean any crevices in the case moulding. After
cleaning dry the EPD with a soft cloth. During cleaning, water may enter the alarm
sounder aperture. The sounder aperture is watertight, although water ingress may
deaden the alarm. Any water should be shaken or blown out of the sounder aperture
to restore the alarm noise level.
6.4.2 Radiological Cleaning
WARNING
DURING OPERATIONAL USE THE EPD MAY BECOME EXPOSED TO
RADIOACTIVE CONTAMINATION. THE EPD MUST BE SUBJECT TO ALL
RELEVANT DECONTAMINATION PROCEDURES LAID DOWN BY THE
RADIOLOGICAL PROTECTION AUTHORITY.
If radioactive deposits are present the unit should be decontaminated by carefully
wiping it over using a disposable cloth or tissue dampened with a detergent solution
and a small brush as described above, or alternatively by using a disposable 'sticky
wipe rag'. The unit should afterwards be checked with a sensitive radiation monitor
to ensure satisfactory decontamination has been achieved.
6.4.3 Cleaning after a Battery Leakage
Any leakage of the EPD battery must be treated with extreme caution. In most
instances battery leakage will be confined within the EPD battery compartment.
Minor leakage (light smearing) may be removed with a proprietary cotton bud
moistened with a water-based detergent. However, if doubt exists as to the extent of
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