Paddle switches supplied to filter maker
A
Mobrey Measurement product story
Edited by the Engineeringtalk editorial team
Jul 26, 2007
Emerson Process Management's 180 Mobrey PLS paddle switches alert the operators at the Soma Power Plant and Seyitomer Power Plant when the levels of ash in the hoppers reach an unsafe level.
Emerson Process Management has supplied 180 Mobrey series PLS paddle switches to Polish ash filter manufacturer, Elwo, for use as high-level alarms in ash hoppers.
The Elwo hoppers are being installed as part of the modernisation of electrostatic precipitators at two Turkish power plants.
The simple and reliable switches, which were easy to install, alert the operators at the Soma Power Plant and Seyitomer Power Plant when the levels of ash in the hoppers reach an unsafe level.
This prevents hopper overfill, which would have significant impact on the operation of the plant, and allows operators to ensure they have emptied the hoppers as required to keep ash within safe limits.
The robust PLS series was selected for this application because it provides good reliability in the harsh conditions of a power plant.
Temperatures reach in excess of 200C and Mobrey's high-temperature models are available to withstand working conditions of 400C.
"We are pleased to support Elwo and also the Turkish power plants by supplying this large international contract for critical applications", said John Walsh, Product Manager of the Mobrey measurement division of Emerson.
"It is an opportunity to combine our technology and support to serve Turkey and Eastern European markets".
Walsh continues: "The first installation was completed six months ago and the switches have proven very reliable".
"We have just completed the second installation".
The Mobrey series PLS paddle switch can be used as either a high-level switch with materials over 160kg/m3 or as a low-level limit switch for dry and solids products over 80kg/m3.
It is easily mounted through the wall of the vessel with the paddle extending inside.
An electric motor drives a paddle which rotates freely in the absence of solid material (ash).
Rotation of the paddle is prevented when covered by the ash and the motor rotates inside the housing to actuate a microswitch and signal an alarm.
A clutch mechanism automatically shuts off the motor, extending its life.
Once the material level falls, the motor is returned to its normal position and the paddle begins to rotate.
The Mobrey paddle switch has standard models to +150C and high-temperature models are available to 400C.
The switches are available with options for easy installation, including, extension shafts for top of silo mounting or mounting plates.
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