ELECTRONIC PERSONAL DOSEMETER HANDBOOK
EPD/HB/40521/000
TECHNICAL DESCRIPTION
ISSUE 5
Thermo
Page 45
4.3 Mechanical Description
4.3.1 Mechanical Characteristics And Dimensions
Display and function control: Single button on the front of the EPD (recessed
to prevent inadvertent operation).
Case material : High impact Polycarbonate/ABS blend.
Clip : High impact plastic clip assembly comprising:
♦
spring clip
♦ lanyard plate,
Weight : 95 gm including LTC battery and clip.
88 gm with lanyard plate only (clip removed).
Dimensions : See Figure 4.1.
4.3.2 Brief Mechanical Description
The EPD is of semi-modular construction and comprises an inner conductive liner,
an outer case assembly and lid. The inner liner houses the EPD’s electronic
components. The outer case, consisting of a moulded front and back, fits around
the inner liner and is fused together to provide physical protection. The lid, which
is fitted to the top of the outer case, has a tight tolerance and is locked in place as
an integral part of the EPD assembly. The outer case and lid are designed not
to
come apart.
The complete assembly is engineered to house functional and operation
components (e.g. EPD battery, LCD display, button, alarm LED, alarm sounder,
IR communications link and beta window (see Figure 2.1). Externally, the outer
case is contoured to receive, and lock in place, a clip assembly (see Section 6.3).
Essentially, component replacement is limited to the EPD battery, battery cap and
clip assembly.
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