The magnetic float level switch opens and closes dry connections. The dry contacts provide an electrical signal to trigger a water level alarm when opened or closed. The water level alarm informs the control panel of low or excessive water levels. If you have an automated water level control system, the control panel will automatically notify the pump to start filling or emptying the water.
A magnetic float level switch provides pump control and high/low-level warning in a broad range of filling/emptying applications. Float and a mechanical or magnetic switching mechanism are often used together. The floating object is detected when the liquid surface reaches its maximum height in the tank.
Food processing plants, Sewage treatment plants, Mining, Agriculture, and more rely on the easy and cost-effective level control provided by these magnetic float level switches.
Advantages of Magnetic Float Level Switch:
Following are the benefits of a magnetic float level switch:
- Magnetic float level switches require no calibration.
- They are dependable, cheap, and straightforward.
- They are wave sensitive.
- As long as the switch materials are suitable, float level switches may be used with any liquid, regardless of its density.
- The presence of vapours, saliva, or boiling at the surface does not affect the float level switches.
Working of Magnetic Float Level Switch:
Magnetic Float switches use a magnetic reed switch with two contacts enclosed in a glass tube to complete a circuit. For the current to flow, a magnet must come within touching distance of the two contacts. They split when the magnet is no longer present and break the circuit.
The float switch has a magnetic reed switch enclosed in a plastic stem or stainless steel. The float has a magnet that slides up and down the branch when the fluid level changes. The contacts in the enclosed reed switch meet the interest, completing the circuit between the two lead wires. The contacts are open or close to signal a high or low Alarm.
Accommodation Ladder:
Accommodation ladders are a standard piece of equipment aboard boats and ships. This style of the portable nautical ladder may be easily draped over the side of a boat or yacht, allowing people to get into or out of the vessel quickly.
A conventional accommodation ladder is a light metal that can hold one or two persons. The fundamental design is two poles, or sides joined by rungs. An accommodation ladder has a hook design on each pole, which allows it to be secured to the side of the boat as required.
‘Re-reeving’ the fall wire may take crucial time if the accommodation ladder is lifted in an emergency. As a result, a thorough examination of this procedure is required. When the winch is not being used, short lengths of yarn tied to the outboard side of the ladder can either be quickly released or will part when it takes on minimal weight. Another option is to attach a tall vertical stanchion and, while leaving the fall wires in place, loosely secure the slack wires to the top of this stanchion.
Issues for Deploying Accommodation Ladder:
- Many boats are fitted with an authorised ‘extension gangway’ that may be attached to the bottom platform of the accommodation ladder and used as a safe ‘bridge’ to the shore in these instances.
- There are times when leaving the ladder hung when berthed in ports with a significant tidal range is preferable, so that crew members can constantly monitor and maintain it.
- The wire from the winch to an outrigger, revved via sheaves on both the inboard and outboard sides of a ladder, is the standard path for gangway fall wires in most designs.
- The reed switch must be moved closer to the float to engage the button, which raises the float and activates the magnet. The output contact changes when the draw gets close to the reed switch.
- As the liquid level rises or falls, there is a change in the contact between the two surfaces. The buoyancy of a float type level metre causes it to rise and fall. It detects a signal from a magnet in the float to a reed switch in the stem. Float switches can last for years with millions of on/off cycles when appropriately used. However, the level metre may not measure some viscosities and gravities.
- Slipping the ladder outboard and landing its foot on the dry ground causes the outboard fall wires to cross across the stairs, making it difficult to go up and down them. A grab block-like mechanism allows the crew to temporarily unreeve the wire from the outboard sheave and relocate it out of the way of a vessel’s access.
