The present application discloses a system comprising a compact curved grating and its associated compact curved grating spectrometer or compact curved grating wavelength multiplexerdemultiplexer module and a method for making the same. The hot swap circuits provide for de-bouncing, controlled charging of the input capacitor of the power supply circuit and soft-start of the pulse width modulator after charging the input capacitor. The hydraulic control circuit comprises a supply unit, a distributor valve adapted to select every time one of the four hydraulic actuators and two solenoid valves adapted to control the hydraulic actuator selected by the distributor valve. Exemplary systems for control and automation service as disclosed herein can have greater flexibility and simplicity from the plant user perspective. Then the arm contacts the outside surface of the L-shaped chute. The super absorbent polymer particle are bonded to the sheet with an adhesive that is applied in a continuous plane to the entire surface or the substantially entire surface at least at the portion to be provided with the super absorbent polymer particle in this sheet.