Differential Pressure Gauges
 The air flow or throughput of a baghouse needs to be measured and monitored regularly. Production rates of collected particulate and the efficiency of the collector are determined by measuring the differential pressure between the inlet duct and outlet duct of the baghouse. The differential pressure or delta P value represents a loss of throughput or air flow through the baghouse. The greater the differential value or pressure drop, the greater the loss of air flow.
This same differential value is then used to determine the start and stop time of the cleaning cycle of the baghouse. Without this measured and monitored differential value, air flows through the baghouse and production rate of the collected particulate may be restricted, resulting in a loss of efficiency.
Magnehelic® and Capsuhelic® differential pressure gauges provide an excellent means of measuring differential pressure values. Photohelic® and Capsu-Photohelic® gauges provide an excellent means of measuring, monitoring, and combining Magnehelic and Capsuhelic gauges with switching circuitry to start and stop cleaning cycles in baghouses.
Magnehelic and Capsuhelic gauges are also used to measure fan and blower pressures, air velocity, furnace draft, and in other similar appapplications.
Photohelic and Capsu-Photohelic gauges can be used to control pressures in air conditioning systems, clean rooms, fluidic and pneumatic systems, and materials handling alarms and fume exhaust systems.
Magnehelic and Capsuhelic Differential Pressure Gauges
- Series 2000 Magnehelic
More than 70 ranges from 0-25" WC to 0-30 psig. Zero center from 0.25-0-0.25" WC to 15-0-15"WC. Low (to 15 psig), medium (to 35 psig), and high total internal pressure styles to 80 psig. Accuracy ± 2% of full scale.
- Series 4000 Capsuhelic
More than 60 ranges, from 0-50" WC to 0-300 psig. Zero center from 1-0-1" WC to 15-0-15" WC. Sensitive to low differential pressures, yet withstands internal pressures to 5000 psig. Accuracy ± 3% of full scale.
Both Magnehelic and Capsuhelic gauges have easy-to-read 4" dials that quickly indicate low air or gas pressures - positive, negative, or differential. Both include simple, frictionless Magnehelic magnetic movement. Resistant to shock, vibration and overpressure. No fluid - no evaporation, freezing, or toxicity problems. Capsuhelic gauges handle compatible fluid internally.
Series 3000 Photohelic and Series 43000 Caspu-Photohelic Pressure Switch/Gauges:
 Both offer more than 60 ranges, from 0-25" WC to 0-6000 psig.
Maximum rated pressure: Photohelic 80 psig; Capsu-Photohelic 500 psig. 1.2X full scale on 436000S models.
Photohelic and Capsu-Photohelic models combine our most precise pressure switch with time-proven Magnehelic gauge design. Knob controls adjust set points. Applied pressure and switch set points are fully visible. Gauge reading not affected by switch operation. Photocell actuated DPDT relays can be interlocked for variable deadband control. Deadband is less than 1% of scale. For positive, negative or differential pressures from 0-25" WC to 0-6000 psig full scale.
Monitoring and controlling differential pressures from the inlet to the outlet ports of a baghouse determines efficiency of the baghouse operation. Greater pressure differential results in reduced air flow through the baghouse, reducing production of particulate rates. Fans and air handling blowers work against resistance loads and, therefore, consume more power and generate greater maintenance requirements. All of these add costs to the overall baghouse operation.
Menardi stocks a variety of differential pressure gauges with various operating ranges. If you are looking for a replacement, we have it. If you are not currently utilizing differential pressure gauges but would like to, our Technical Support Group will provide various approaches to help you measure and monitor you air flow systems.
Magnehelic®, Capsuhelic®, Photohelic®, and Capsu-Photohelic® are registered trademarks of Dwyer Instruments.
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