Applications Of The Furnas Pressure Switch
This article discusses the applications of the Furnas pressure switch from Hubbell Industrial Controls Inc. for ensuring that the pressure does not exceed certain levels both for safety and for effective operation. This switch is usually connected in series with the control circuits of the systems that need to be shut down if the pressure happens to reach a certain threshold. This particular brand of pressure switches utilizes electromechanical switches that have an electronic switch that is linked to a sensory element. The Furnas pressure switch can also be used for the automatic control of water systems, air systems, pumping systems, and sprinkler systems.
The models for the Furnas pressure switch that are designed for the control of water systems are the 69E and the 69W. For air systems, the models are the 69J and the 69M/69H. There are also some models for special applications. Brands that offer the same products and services like Hubbell include the Barksdale pressure switches and the CCS pressure switches. For other brands, do not forget to check the cross reference provided by websites focusing on these devices. Meanwhile, the Furnas 69ES is specifically designed for use in the control of water wells. They are designed for direct application for all kinds of pumps up to 5 hp. For pumps that are bigger than 5 hp, this particular kind of pressure switch is also designed for use in the control circuit of the pumps’ magnetic starter.
For air systems, the 69E models are designed to be the most versatile in the market. Their purpose is for the regulation of the compressor. The unloader can be installed on either side of the pressure switch or it can be rotated to allow installation using one of the eight possible positions so that the tubing and the time required are minimized. This particular model has a maximum pressure rating of 200 psi. The 69M models are for the control of tank pressure so that it stays within a certain range, while the highest pressure allowable is 175 psi. For heavy duty requirements, the 69H models can be used because the maximum pressure is 250 psi.
Other models for the Furnas pressure switch are for special applications. The GARD-IT model is designed to cut off the pump motor whenever the failure of the air or water supply results in the system pressure dropping to a value that is below the threshold of the standard pressure switch. And when the supply returns, depressing the reset lever manually will cause the system to be switched to automatic operation until the system pressure reaches the maximum GARD-IT level. The HI-GARD model is designed to open the contacts when a particular pressure is attained. This device is manually reset when the system pressure returns to normal. Meanwhile, it should be noted that there are other ways for safeguarding such systems and these include the use of other kinds of pressure switches and pressure sensors. Do not forget to also consider the use of pressure sensors, including the Keller pressure sensors.
