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PXP
Analog to Pneumatic Output Transducer for 18 to 25 psig Air Supply Pressure
- Converts analog control signals into pneumatic output: The PXP Series accepts 0-5 VDC, 0-10 VDC, 0-15 VDC, or 0-20 mA input signals and produces a proportional 0-15 psig pneumatic output.
- Ideal for HVAC pneumatic control: Designed for three-way mixing valves, pilot positioners, pneumatic valve and damper actuators, fan vane control, DDC systems, mixing boxes, and VAV box applications.
- Built-in pressure feedback: Provides a 0-5 VDC feedback signal that represents branch line pressure, making it easier to monitor output pressure from a controller or BAS.
- Flexible model options: Available in single-valve, constant-bleed, low-consumption, fail-safe, and high-flow configurations to match different pneumatic control requirements.
- Manual override for setup and service: Jumper-selectable manual override allows technicians to control output pressure during installation, checkout, and troubleshooting.
- Reliable operation in control panels and ceiling spaces: Compact snaptrack-mounted design with removable terminal blocks and barbed pneumatic fittings supports clean installation in panels or above-ceiling HVAC applications.
- Accurate pneumatic modulation: Delivers 1% full-scale accuracy at room temperature and 2% full-scale accuracy across the operating range for dependable actuator positioning.
- Service-friendly connections: Includes removable brass barbed fittings, pluggable screw terminals, integral air filtration, and a plugged gauge port with optional pressure gauge support.
Product Overview
- Accuracy Detail Output Pressure Accuracy: 1% full scale @ room temperature
- Air Supply Pressure, Max 25 psi
- Air Supply Pressure, Min 18 psi
- Applications Air and HVAC, Building and Maintenance, Environmental Monitoring, Pneumatic Systems
- Approvals RoHS2, WEEE
- Auto/Manual function Manual / Auto Override: MAN function = output can be varied
- Electrical Connection Screw Terminal
- Filter Furnished with integral-in-barb 80-100 micron lter (Part # PN004) except for PXP2LG which is furnished with external 5 micron in-line lter (PN021)
- Height 2.18 in
- Impedance Input Input Signal Source (@ Impedance): 0-5 VDC @ 10,000 Ω
- Input Type Analog
- Length 3.25 in
- Materials PVC
- Operating Humidity 10 to 95% RH, non-condensing
- Operating Temperature, Max 120 °F
- Operating Temperature, Min 35 °F
- Output Note Feedback Signal Output Range: 0-5 VDC = Output Span
- Output Pressure Range 0 to 15 psi
- Pressure Note Gauge Pressure Range (Gauge Models): 0-30 psig (0-200 kPa)
- Series ID PXP
- Storage Temperature, Max 150 °F
- Storage Temperature, Min -20 °F
- Supply Voltage 24 Vac/Vdc
- Tightening Torque 0.5 Nm (Minimum); 0.6 Nm (Maximum)
- Tube Size 1/4 in OD x 1/8 in ID
- Width 2.18 in
- Wire Gauge 26 to 16 AWG
Supported Applications
The ACI PXP series is an analog to pneumatic output transducer that converts an analog electrical input signal into a proportional pneumatic output. The device automatically modulates control valves to regulate branch line pressure based on the selected set point determined by the input signal. Documented applications include Three-Way Mixing Valve Control, Pilot Positioner Control, Pneumatic Valve & Damper Actuator Control, Fan Vane Control, DDC Control, and Above Ceiling Applications for mixing and VAV boxes.
Operating Conditions & Performance
The PXP series operates with an air supply pressure range of 18 psig (124.106 kPa) minimum to 25 psig (172.369 kPa) maximum. The standard output pressure range is field-calibratable up to a maximum of 0 to 15 psig (0-103.421 kPa), with EPC products offering a 0 to 20 psig modulating output. Output accuracy is specified as 1% full scale @ room temperature and 2% full scale across the operating temperature range.
Electrical power requirements are 24 VAC (+/-10%), 50 or 60 Hz, or 24 VDC (+10%/-5%). The unit accepts selectable input signal ranges of 0-5 VDC @ 10,000 Ω, 0-10 VDC @ 10,000 Ω, 0-15 VDC @ 10,000 Ω, or 0-20 mA @ 250Ω. A feedback signal output of 0-5 VDC proportional to the branch line pressure is provided.
Operating conditions require an ambient temperature range of 35 to 120°F (1.7 to 48.9°C) and humidity between 10 to 95% non-condensing. Storage temperatures are rated from -20 to 150°F (-28.9 to 65.5°C). The device requires a minimum branch line capacity of 2 in³ (33.78 cm³) to operate without oscillation.
Configuration Options
The series offers multiple configurations distinguished by valve architecture, bleed orifice sizing, and fail-safe behavior:
- PXP0.3 / PXP0.3G: Single valve version with no air consumption; does not bleed or exhaust air.
- PXP1.3 / PXP5.3 / PXP7.3 (and G variants): Constant bleed controllers where branch exhaust response time is determined by the specific bleed orifice size and pressure differentials. Orifice sizes include 0.010" Silver, 0.005" Copper, and 0.007" Brass.
- PXP2.3 / PXP2.3G: Two-valve design that does not use air at set point; maintains branch pressure if power fails (assuming no leaks).
- PXP2.3FS / PXP2.3GFS: Fail-safe models equipped with a Normally Open (N.O.) branch exhaust valve to exhaust branch line pressure on power failure.
- PXP2.3LG: High-flow model furnished with an external 5 micron in-line filter (PN021) instead of the standard integral-in-barb filter.
All models feature a machined aluminum manifold with removable brass barbed fittings for Main and Branch connections, accepting 1/4" O.D. nominal (1/8" I.D.) polyethylene tubing. A plugged 1/8-27-FNPT gauge port is available on all units; an optional pressure gauge (0-30 psig / 0-200 kPa) can be installed at additional cost.
Key Product Differences
Variants within the PXP series differ primarily in their pneumatic control logic and physical dimensions. Models with a "G" suffix include an integrated pressure gauge, increasing overall depth from 0.70" (17.78mm) to approximately 2.95" (74.90mm). The housing material is Polyvinyl Chloride (PVC) for the Snaptrack mounting system with a UL94 V-0 flammability rating.
Power consumption varies by model type, ranging from 160 mA maximum to 200 mA on fail-safe models. Air flow capacity differs between standard and high-flow versions; supply valves are rated at 750 SCIM (37.69 Liters) for most models, while the PXP2LG supports up to 1400 SCIM (22.94 Liters). Accessories include a DIN Rail Adapter Kit, Transient Voltage Suppressors, and replacement orifice kits.
PDFs & Manuals
