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.
17