Cleveland Controls AFS-477 Sensing Switch
The Cleveland Controls AFS-477 Air Pressure Sensing Switch is an industrial-grade proving switch designed for HVAC, Energy Management, and DDC (Direct Digital Control) systems. This differential air pressure switch features gold-plated contacts, making it the preferred choice for low-ampere circuits and computer-controlled environments where high conductivity and signal integrity are paramount. With a field-adjustable set point range of 0.05" w.c. to 2.0" w.c., the AFS-477 provides precise monitoring of positive, negative, or differential pressure across fans, filters, and dampers. The rugged plated housing contains a silicone diaphragm and a snap-acting SPST switch (also available as SPDT in standard configurations) rated for 100,000 cycles at 0.5 psi. Designed for vertical surface mounting, it utilizes screw-type terminals with cup washers and 1/4" OD compression connectors to ensure secure pneumatic and electrical integration in demanding mechanical rooms.
Key Benefits for Contractors:- High Signal Reliability: Integrated gold contacts prevent oxidation, ensuring reliable switching in low-voltage DDC and dry circuit applications.
- Precision Calibration: Features a field-adjustable set point ranging from 0.05" to 2.0" w.c., allowing for fine-tuned air flow proving.
- Versatile Sensing: Capable of sensing positive, negative, or differential pressure, offering flexibility for various air flow monitoring requirements.
- Durable Construction: The corrosion-resistant plated housing and silicone diaphragm operate across a wide temperature range of -40°F to 180°F.
- Easy Installation: Equipped with a 7/8" conduit opening for 1/2" conduit and standard 1/4" compression fittings for fast field wiring and plumbing.
How do I adjust the set point on the AFS-477?
To calibrate the air pressure sensing switch, turn the adjustment screw counterclockwise until it stops, then turn it four full rotations clockwise to engage the spring. Each subsequent full turn adjusts the set point by approximately 0.2" w.c. Always use a manometer to verify the final set point.
Can this switch be used with flexible tubing?
The standard AFS-477 uses 1/4" OD compression ferrules for rigid or semi-rigid tubing. For applications requiring flexible plastic tubing, an optional slip-on tubing adapter (P/N 18311) is required to ensure a leak-proof connection.
Why does mounting position matter for this sensing switch?
For maximum accuracy at the lowest set points, the unit must be mounted with the diaphragm in a vertical plane. Mounting the switch horizontally can shift the set point due to the weight of the internal components affecting the differential pressure sensitivity.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $68.19
-65%$68.19
$23.87Cleveland Controls AFS-477 Sensing Switch
The Cleveland Controls AFS-477 Air Pressure Sensing Switch is an industrial-grade proving switch designed for HVAC, Energy Management, and DDC (Direct Digital Control) systems. This differential air pressure switch features gold-plated contacts, making it the preferred choice for low-ampere circuits and computer-controlled environments where high conductivity and signal integrity are paramount. With a field-adjustable set point range of 0.05" w.c. to 2.0" w.c., the AFS-477 provides precise monitoring of positive, negative, or differential pressure across fans, filters, and dampers. The rugged plated housing contains a silicone diaphragm and a snap-acting SPST switch (also available as SPDT in standard configurations) rated for 100,000 cycles at 0.5 psi. Designed for vertical surface mounting, it utilizes screw-type terminals with cup washers and 1/4" OD compression connectors to ensure secure pneumatic and electrical integration in demanding mechanical rooms.
Key Benefits for Contractors:- High Signal Reliability: Integrated gold contacts prevent oxidation, ensuring reliable switching in low-voltage DDC and dry circuit applications.
- Precision Calibration: Features a field-adjustable set point ranging from 0.05" to 2.0" w.c., allowing for fine-tuned air flow proving.
- Versatile Sensing: Capable of sensing positive, negative, or differential pressure, offering flexibility for various air flow monitoring requirements.
- Durable Construction: The corrosion-resistant plated housing and silicone diaphragm operate across a wide temperature range of -40°F to 180°F.
- Easy Installation: Equipped with a 7/8" conduit opening for 1/2" conduit and standard 1/4" compression fittings for fast field wiring and plumbing.
How do I adjust the set point on the AFS-477?
To calibrate the air pressure sensing switch, turn the adjustment screw counterclockwise until it stops, then turn it four full rotations clockwise to engage the spring. Each subsequent full turn adjusts the set point by approximately 0.2" w.c. Always use a manometer to verify the final set point.
Can this switch be used with flexible tubing?
The standard AFS-477 uses 1/4" OD compression ferrules for rigid or semi-rigid tubing. For applications requiring flexible plastic tubing, an optional slip-on tubing adapter (P/N 18311) is required to ensure a leak-proof connection.
Why does mounting position matter for this sensing switch?
For maximum accuracy at the lowest set points, the unit must be mounted with the diaphragm in a vertical plane. Mounting the switch horizontally can shift the set point due to the weight of the internal components affecting the differential pressure sensitivity.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Cleveland Controls AFS-477 Air Pressure Sensing Switch is an industrial-grade proving switch designed for HVAC, Energy Management, and DDC (Direct Digital Control) systems. This differential air pressure switch features gold-plated contacts, making it the preferred choice for low-ampere circuits and computer-controlled environments where high conductivity and signal integrity are paramount. With a field-adjustable set point range of 0.05" w.c. to 2.0" w.c., the AFS-477 provides precise monitoring of positive, negative, or differential pressure across fans, filters, and dampers. The rugged plated housing contains a silicone diaphragm and a snap-acting SPST switch (also available as SPDT in standard configurations) rated for 100,000 cycles at 0.5 psi. Designed for vertical surface mounting, it utilizes screw-type terminals with cup washers and 1/4" OD compression connectors to ensure secure pneumatic and electrical integration in demanding mechanical rooms.
Key Benefits for Contractors:- High Signal Reliability: Integrated gold contacts prevent oxidation, ensuring reliable switching in low-voltage DDC and dry circuit applications.
- Precision Calibration: Features a field-adjustable set point ranging from 0.05" to 2.0" w.c., allowing for fine-tuned air flow proving.
- Versatile Sensing: Capable of sensing positive, negative, or differential pressure, offering flexibility for various air flow monitoring requirements.
- Durable Construction: The corrosion-resistant plated housing and silicone diaphragm operate across a wide temperature range of -40°F to 180°F.
- Easy Installation: Equipped with a 7/8" conduit opening for 1/2" conduit and standard 1/4" compression fittings for fast field wiring and plumbing.
How do I adjust the set point on the AFS-477?
To calibrate the air pressure sensing switch, turn the adjustment screw counterclockwise until it stops, then turn it four full rotations clockwise to engage the spring. Each subsequent full turn adjusts the set point by approximately 0.2" w.c. Always use a manometer to verify the final set point.
Can this switch be used with flexible tubing?
The standard AFS-477 uses 1/4" OD compression ferrules for rigid or semi-rigid tubing. For applications requiring flexible plastic tubing, an optional slip-on tubing adapter (P/N 18311) is required to ensure a leak-proof connection.
Why does mounting position matter for this sensing switch?
For maximum accuracy at the lowest set points, the unit must be mounted with the diaphragm in a vertical plane. Mounting the switch horizontally can shift the set point due to the weight of the internal components affecting the differential pressure sensitivity.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
