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This product is not eligible for return or exchange unless defective. Once production has begun, order cannot be canceled even if it is not shipped yet. We suggest that you would double-check the product specifications and features to make sure the item complies with your requirements.
This product can be customized to your needs (voltage, ranges, sizes, additional documents, etc.). Please Contact Us or Add to Quote if any specific requirements are needed.
Dwyer Instruments, 3300-20MM, 3000 Photohelic Pressure Switch / Gage, 10 - 0 - 10 Zero Center mm. of Water
The Photohelic Switch / Gage is a very versatile, precise pressure switch combined with the time-proven Magnehelic pressure gage. Gage reading is unaffected by switch operation. Easy to adjust set points have knob controls. Applied pressure and switch set points are fully visible at all times. Deadband is one pointer width - less than 1% of full scale. Double-pole double-throw relays can be easily interlocked to provide variable deadband control.
Photohelic Gage Sensing. In a typical control application, the Photohelic switch / gage controls between high and low pressure set points. When pressure changes, reaching either set point pressure, the beam from an LED to the limiting phototransistor will be cut off by the helix-driven light shield. The resulting signal change is electronically amplified to actuate its DPDT slave relay and switching occurs. Dead band between make and break is 1% of full scale or less - just enough to assure positive, chatter-free operation.
Item is non-returnable unless defective
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Dwyer Pressure Gauges
Dwyer Photohelic
Note: Please read description carefully. Do not base your order on the picture presented.
