Dwyer Instrumentation Used in Dust CollectorsThere are various types of instruments used in a dust collector system. Dust collector systems are utilized to enhance the quality of air released from industrial or commercial processes, by collecting dust and other impurities in the air.
When dust laden air is drawn from the process and passed thru the dust collector’s filters, the filters collect the dust and clean the air before it is discharged outside or recycled back into the facility. As this process continues, dust builds on the filters; reducing their ability to effectively clean the air. Dwyer’s instruments and controls offer a great solution to clean the dust collector’s filters, either manually or on-demand. This allows the dust collector to run continuously, which prevents costly production delays and/or shutdowns.
One of the instruments used to visually monitor the differential pressure across the filters is the Series 2000 Magnehelic® Differential Pressure Gage. It is an extremely economic option if you are considering only visual monitoring. Magnehelic® Differential Pressure Gage is used for high accuracy--guaranteed within 2% of full scale; while the design resists over-pressures shock and vibration.
If your application requires an explosion proof instrument to visually monitor the differential pressure across the filters, you can simply choose our ATEX approved Differential Pressure Gage Series 2000 Magnehelic, AT22000. Moreover, this gage can also indicate positive, negative or differential pressures and is accurate within 2%.
There are instances where you may want to not only visually monitor the differential pressure across the filters, but also to control a timer board to start and stop cleaning cycles. For these instances you can choose either our Series A3000 Photohelic Pressure Switch/Gage or the Series DH3 Digihelic Differential Pressure Controller.
The Photohelic® Switch/Gage function as versatile, highly repeatable pressure switch combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Series DH3 Digihelic® Differential Pressure Controller is a 3 in 1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output all packed in the popular Photohelic® gage style housing. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time and money.
Dwyer Instruments’ Timer boards, Series DCT1000 and Series DCT600, are used to sequence pulse valves once the differential pressure controllers indicate there is a demand for cleaning; or you can use for continuous cleaning as well. The Series DCT1000 eliminates external devices such as pressure switches, relays and timers. The units modular design allows for use as a continuous cleaning control or on-demand cleaning control using the optional plug-in pressure module. A 4-20 mA process output is integral to the plug-in pressure module, eliminating the need to purchase a process transmitter.
Mounting holes are standard to other dust collector controllers used in the industry, allowing you to use the DCT1000 for existing installations. The Series DCT 600 was designed for ease of installation in your dust collector system. For installations requiring fewer channels than available on the board, a shorting plug or dip switches allows selection of the last used channel. Time-on and time-off settings are selected using two potentiometers. High-limit and low-limit control inputs are provided for use with on-demand systems. Units can also work in continuous clean mode.
In order to remove the dust and debris from the filters we use pulse valves, Series DCS and RDCS. These valves are operated for a fraction of a second, pulsing a blast of high pressure air down the filters. The Series DCS/RDCS Springless Dust Collection Valves are ideal for use with the Series DCT1000 and Series DCT500 duct collection timer boards. A springless design offers not only durability, but also reliability for an exceptional cleaning pulse. Both the Series DCS and RDCS have the option for either coupling or NPT connections.
Bulk Head Connectors, Series BHC, are used to connect blow tubes and venturi’s inside the dust collector to the pulse valves that are located on the outside of the unit.
Once the dust and debris is removed from the filters, the discharged air from the dust collector needs to be monitored. Our Series PMT Particulate Transmitter, is used for this purpose. The Series PMT is a reliable dust collector emissions monitor and leak detector. The loop powered design is ideal for direct connection to existing PLCs or other baghouse diagnostic control systems. Particulate transmitters allow operators to observe the efficiency of their fillers and monitor when filters are worn-out or broken. It can detect a hole in the filter smaller than the eye can see!
In the event that dust clogs or bridges the bottom of the dust collector, the Series PLS2, a paddle level switch, is used for protection preventing it from being discharged. The Series PLS2 is an electromechanical level switch designed for level monitoring of bulk materials. The rotating measuring vane is driven by a brushless synchronous motor at one revolution per minute. As product builds up, the paddle rotation is impeded and the resulting motor torque activates the output switch and stops the motor. A spring mechanism reactivates the motor and returns the switch to normal state when the material no longer impedes the paddle rotation.