Alarm system is not only meant for fire detection or other similar equipment.

Equally important in all machineries used onboard

The chosen machinery here is boiler

There are several important alarm control systems which are controlling or manipulating the boiler

These are several alarm system operational equipments:-

1. Salinity alarm equipment

2. Oxygen analyzer

3. Flame safeguard

The conductivity limit switch, is used to amplify and transform signals from a conductivity electrode, for continuous monitoring of the conductivity in feed and boiler water

1a RED led

1b GREEN led

2 switch point adjuster

3 measuring range switch

4 adjuster for temperature compensation

5 screw to fasten the cover base

The ultrasonic sensor contains two piezoelectric crystals. A high frequency signal (3.7 MHz) generated by the control unit is transmitted to one piezoelectric crystal by coaxial cable. This crystal converts the electrical signal into an ultrasonic oscillation.

The sensor design allows the ultrasonic oscillation to pass from the transmitter crystal to the receiver piezoelectric crystal.

There is a gap between the transmitter and receiver When the gap is in the liquid the signal reaches the receiver due to low

ultrasonic attenuation of the liquid if it is in oil it is vice versa.

In the event of non-ignition of the flame or loss of flame during burner operation, the supply of fuel is always interrupted instantaneously. The unit can be reset by pushing the reset button on the flame safeguard. Any flame signal - in normal operation or a faulty flame signal - is signalled by the indicator lamp.

The switching function needed to enter the flame signal to the control circuit of the burner system is provided by the flame relay “FR” of the flame safeguard.