AX-ADPS-8x Differential Pressure Switch – High-Precision Airflow Proving and Filter Status Monitor

The AX-ADPS-8x Differential Pressure Switch is a highly accurate, cost-effective mechanical monitoring device designed specifically for modern commercial HVAC systems and building management services (BMS). Manufactured by Axio, this switch offers precise, non-contact monitoring of air movement across specialized industrial ventilation ducts and air filtration networks. It serves as a vital safeguard to identify fan failures, duct obstructions, or heavily soiled filters before they affect building indoor air quality or damage equipment.

The functional layout of the AX-ADPS-8x Differential Pressure Switch features a scaled manual adjustment knob embedded underneath a clear, impact-resistant protective cover. Operating on a sensitive silicone diaphragm principle, the switch tracks pressure imbalances between its high-pressure (P_1) and low-pressure (P_2) mechanical ports. When the pressure difference climbs past the calibrated setpoint, an internal Single-Pole Double-Throw (SPDT) change-over switch snaps closed. This sends an instant digital warning signal to the main system controller.

Key Features of AX-ADPS-8x Differential Pressure Switch

• Field-Selectable Six Range Architectures: The “8x” family encompasses six distinct factory models (ranging from the low-pressure AX-ADPS-80 to the high-pressure AX-ADPS-87) to seamlessly handle thresholds from 20 Pa up to 4,000 Pa.

• Integrated Scaled Adjustment Dial: Incorporates an outer visual dial calibrated in Pascals (Pa), allowing technicians to accurately select trip points without connecting external reference gauges.

• Robust Single-Pole Double-Throw (SPDT) Relay: Equipped with high-conductivity volt-free contacts rated up to 250 VAC and 1.5 A, making integration straightforward with digital input cards or warning sirens.

• Ultra-Sensitive Silicone Diaphragm Core: Built with a resilient, premium silicone diaphragm that ensures excellent measurement repeatability and long-term calibration stability over millions of cycles.

• Dual IP Enclosure Classifications: Supplied in a standard IP54 dust-protected housing, with upgraded IP65 water-tight enclosure configurations available for harsh outdoor plant conditions.

• Comprehensive Factory Duct Fitting Kit: Packaged right out of the box with an installation kit containing two meters of flexible 6 mm plastic tubing, twin pitot static pressure probes, and mounting hardware.

Applications and Usage of AX-ADPS-8x Differential Pressure Switch

The reliable monitoring, mechanical durability, and broad pressure options of the AX-ADPS-8x Differential Pressure Switch make it a standard choice across cleanroom environments and air handling arrays:

• HVAC Air Filter Performance Tracking: Installed directly across intake filter beds. The switch monitors the pressure drop between the dirty air inlet (P_1) and clean air outlet (P_2) to flag maintenance teams when the filter is clogged.

• Ventilation Fan and Flow Proving Loops: Placed next to large multi-stage supply fans. It verifies that air is moving down the ductwork by cross-referencing internal static air pressure against ambient room air pressure.

• Frost and Overheat Heat Exchanger Safeguards: Monitors the air space flanking commercial heat exchangers to trigger defrost cycles or emergency shutdowns if localized airflow chokes up.

• Stairwell and Cleanroom Positive Pressurization: Ensures that targeted spaces maintain a slightly higher relative air pressure to prevent outside airborne smoke, dust, or chemicals from leaking past access doors.

Technical Specifications

Benefits of the AX-ADPS-8x Differential Pressure Switch

• Drastically Lowers Energy Overhead: Catching blocked air pathways early helps reduce excessive motor drag on variable-speed fans, lowering utility bills.

• Simplifies HVAC Commissioning Tasks: The clear, front-facing visual adjustment dial eliminates the need for technicians to balance small inner calibration springs or carry heavy hand-held manometers during routine field checkups.

• High Tolerance Against Environmental Variations: The robust Nylon 6.6 outer body combined with an optional ATEX explosion-proof version makes this series highly dependable for chemical exhaust vents and hazardous industrial areas.

Installation and Wiring Guidelines

• Mounting Orientation Priority: To ensure maximum accuracy, always bolt the chassis onto a flat vertical plane with the pressure hose fittings and M20 cable gland pointing straight down. Mounting the switch horizontally can shift the dial’s accuracy calibration by approximately +20 Pa.

• Hose Port Mapping: Push your 6 mm PVC tubing firmly over the barbed pipe adapters. Connect the higher pressure zone (such as the upstream side of a filter) to port P1. Connect the lower pressure suction zone to port P2.

• Electrical Safety Rules: Always verify that the electrical lines are completely de-energized before lifting the polystyrene cover. Use the provided 6.3 mm male spade adapters to securely snap the BMS feedback loop lines onto the internal SPDT contact terminals.

  To review official pressure range classifications, installation orientation adjustments, or safe ATEX-rated explosion-proof parameters, check the complete Annicom Axio Panel Instrumentation Guide.

  To request an official commercial RFQ for bulk project orders or verify real-time regional warehouse stock availability, please connect with our technical sales division via the Control Qatar Contact Page.