Choosing the correct flow switch or flow meter for your application can be challenging, especially with the sheer volume of designs on the market. When you’re selecting a flow switch for your application, it’s important to know the basics in order to make an informed decision. Continue reading to find out more about flow switches in this helpful guide from Fluid Controls.
A flow switch is a mechanical device that’s used to control the flow of air, steam or liquid. Flow switches work by sending trip signals to another device (this can be a pump) within the system. It tells the device to turn on and shut off, which further protects it from damage and provides cooling circuit protection.
Flow switches determine if flow is above or below a specific rate. This is known as a set point. The set point can either be adjustable or fixed, depending on the specification of the individual device. When the set point is reached, the response is often the actuation of an electric circuit. Once it’s tripped, the flow switch stays in its new state until the fall drops below the set point.
A water flow switch, which is also known as a water flow detector, is an electro-mechanical device that’s designed to send an alarm to a monitored panel (and/or fire department) when a continuous flow of water occurs through a fire sprinkler system’s piping.
The flow of water signifies an activated sprinkler head or a leak within the system.
A flow meter is a device that’s used in fluid systems to measure linear, non-linear, volumetric or mass flow rate of a liquid or gas. They have many different applications and can be fitted with an integrated flow control valve to control output flow.
When choosing a flow meter for your application, it’s important to consider a range of factors, including the familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and the average time between failure on site.
There is no one-size-fits-all flow meter that’s suitable for all types of applications, so it’s important to select the correct device for you. Choosing the right flow meter for your application requires writing a detailed specification that covers the use of the meter, taking into account the features of each meter type. This will help to narrow down the critical specifications and select a corresponding product. If you require some professional expertise, Fluid Controls’ expert advisers can help with your decision-making process.
Flow switches and flow meters are very reliable devices for determining flow rates. A couple of benefits worth mentioning are that they can be used for a number of different applications. These include industrial and biomedical applications to name just two.
Flow switches also offer plenty of versatility, economy and accuracy. Some flow switches can be used to actuate audible or visual alarms, as well as relays or other controls.
Flow meters, like flow switches, have plenty of advantages in their favour. Firstly, they can give a true mass flow measurement and produce extremely precise readings. They’re also unaffected by pressure, temperature and viscosity with self-draining characteristics.
There is one key difference between flow switches and flow meters, and it is in relation to how they function. Flow meters monitor the rate of flow and the user must check the flow rate themselves. This must be done as and when rather than at predetermined intervals in order to detect any potential issues.
In comparison, flow switches can detect the presence of the flow at a predetermined set point. A flow switch can then alert the user and perform a designated action.
At Fluid Controls, we can supply a complete range of flow switches, flow meters and even excess flow valves. Malema’s range of flow switches, meters and valves are recognised by the leading certification bodies around the world, and you can get them from us.
Widely used in industries that range from offshore to semiconductors, including harsh environments, Malema’s products are UL and ATEX-approved as well as CE-compliant. They’re available in a choice of materials and are suitable for almost all measuring and monitoring applications.
Speak to a Fluid Controls adviser today about our complete range of flow switches and flow meters by contacting us at +44 (0) 118 970 2060 or Sales@FluidControls.co.uk.