This is a complete system which can be delivered either as a single or as a dual point system. When delivered as a dual point system it is approved as two independent systems as required in the regulations.

Some features
• Does not require any specialist engineer for installation or start up.
• Proven to be very reliable.
• Two years guarantee.
• Reference list exceeds 700 tanker vessels.
• Type approved by all the main classification societies.
• Short delivery times.

• The system fulfils IMO, USCG and classification societies’ rules and regulations.

The system’s main parts are the SENSORS and the ALARM CABINET.

Type HL-8903 for one level and type HHL-8903 for two levels. This float type sensor works on a permanent magnet - reed switch principle, and the construction is unique with the following advantages:

• Will not be damaged when mounted close to a tank washing machine.
• Complete unit in stainless steel.
• Will not stick due to very small surface area between the float and the guides.
• Can handle high pressure, low density and high temperature.
• Can operate in any type of cargo which can be pumped.
• Has a lifting knob on top of the sensor connection box for testing.
• Fail to safe operation with closed contacts in normal position.
• Virtually the same alarm point for different cargo densities.
• Designed without any active electronic components in order to avoid problems when working in the open deck area.
Type OAS-5 is a complete signal monitoring and alarm unit which can be delivered for single or dual point sensors and is equipped with:

• Intrinsically safe connections to sensors.
• Potential free contacts for common external alarm light and horn.
• All normal alarm functions.
• «Alarm hold» function in order to avoid repeated alarms on the same measuring point.
• (Option.) RS 485/422 serial line communication with host computer.
• Mains supply from one or two AC fused circuits. Two required if dual point system because of the independence requirements.
• The Alarm Panel can either be mounted in the front door of the alarm cabinet or in a common console.
• The complete system can, according to requirement in the regulations,
be tested by the test knob on the sensor’s connection box.