1.4 Design and principle of operation
1.4.1 Design of the radiometer
The radiometer (according to Figure 1) is designed as a rectangular
parallelepiped rounded on each side. The plastic damp and dustproof body of the
radiometer (ingress protection rating IP54) consists of two parts – upper (1) and
lower (2) covers. The LCD (3), “ALARM” light-emitting diode (4) and two key of
control MODE (5) and THRESHOLD (6) are located on the panel of the upper cover.
The printed-circuit board with the electric circuit of the device is screwed with four
screws to the upper cover of the radiometer. All inscriptions of the upper cover are
serigraphy applied.
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