ACI's Interface Devices convert one signal type to another. While many of the devices share similar functions, knowing their differences will help you know the best device for your application:
- The Difference Between ACI's EPC and PXP Interface Devices
- PXP Product Specifications
- EPC Product Specifications
- Interface Device Selection Matrix
ACI Interface Devices: The Difference Between EPC and PXP
ACI manufactures an extensive line of Interface Devices designed to solve problems. Many of ACI interface products are used to convert one signal type to another saving you time and money on retrofit projects.
Two such devices are ACI’s EPC and PXP which convert analog signals to pressure outputs. They are perfect for retrofit jobs with dampers or other parts controlled with pneumatic signals.
Watch Tech-Tip Videos on ACI A/PXP and A/EPC products below.
How to Tell the Difference Between ACI's EPC and PXP Interface Devices
2 Valve vs Fail Safe vs Bleed Differences on EPC/PXP
PXP Analog to Pneumatic Output
The PXP*.3 is an electric to pneumatic transducer which converts an analog electrical input signal to a proportional pneumatic output. The PXP*.3 will automatically modulate its control valve(s) to regulate the branch line pressure to the selected set point as determined by the input signal. The PXP*.3 offers four selectable input ranges which convert to a 0 to 15 psig modulating output (See EPC product for 0 to 20 psig outputs). A 0-5 VDC feedback signal indicating the resultant branch line pressure is also provided. This signal varies linearly with branch pressure (0 volts= 0 psig, 5 volts = 15 psig). The PXP0.3 is a single valve version that does not bleed or exhaust air. Its operation depends on the pneumatic circuit where it is installed to consume between 14 and 73 scim. The PXP1.3, 5.3, and response time determined by the bleed ori ce size and pressure di erentials (see ordering grid on the tinue to bleed through the bleed ori ce until branch pressure is zero psig. A three-way solenoid valve assembly may be used with the bleed type PXP1.3, 5.3, or 7.3 to allow control to fall back to the original local controller if power fails. The PXP2.3 incorporates two valves and does not use air at set point. It’s branch exhaust ow and response time are not limited by an internal restrictor and are similar to its load rate. If power fails to the PXP2.3, branch line pressure remains constant if the branch line does not leak air. The PXP2.3FS is equipped with a N.O. branch exhaust valve which allows exhaust of branch air on power failure. A manual override (jumper selectable), which controls the output pressure, is provided for setup and troubleshooting. Custom calibration is available upon request for an additional charge. This will speed up installation time for the end user.
Applications: Three-Way Mixing Valve Control, Pilot Positioner Control, Pneumatic Valve & Damper Actuator Control, Fan Vane Control, DDC Control, Above Ceiling Applications (mixing and VAV boxes)
The PXP is covered by ACI's Two (2) Year Limited Warranty. The warranty can be found in the front of ACI's Sensors & Transmitters catalog, as well as on ACI's website, www.workaci.com.
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PRODUCT SPECIFICATIONS
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Supply Voltage:
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24 VAC (+/-10%), 50 or 60Hz, 24 VDC (+10%/- 5%)
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Supply Current:
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160 mA maximum, 200 mA on fail safe models
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Input Signal Source (@ Impedance):
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0-5 VDC @ 10,000 | 0-10 VDC @ 10,000 | 0-15 VDC @ 10,000 | 0-20 mA @ 250
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Feedback Signal Output Range:
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0-5 VDC = Output Span
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Output Pressure Range:
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Field Calibration Possible: 0 to 15 psig (0-103.421 kPa) maximum
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Air Supply Pressure:
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Maximum: 25 psig (172.369 kPa) | Minimum: 18 psig (124.106 kPa)
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Air Consumption:
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See Ordering Grid
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Output Pressure Accuracy:
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1% full scale @ room temperature | 2% full scale across operating temperature range
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Manual / Auto Override:
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MAN function = output can be varied | AUTO function = output is controlled from input signal
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Air Flow:
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Supply valves @ 20 psig (138 kPa) main/15 psig (103 kPa) out, 750 scim (1400 on LG model)
Branch Line requires 2 in or 33.78 cm (min.). Branch line min. of 25 feet of 1/4” O.D. poly tubing
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Filtering:
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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)
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Connections:
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90° Pluggable Screw Terminal Blocks
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Wire Size:
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16 (1.31 mm ) to 26 AWG (0.129 mm )
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Terminal Block Torque Rating:
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0.5 Nm (Minimum); 0.6 Nm (Maximum)
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Connections | Pneumatic Tubing Size-Type:
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1/4" O.D. nominal (1/8” I.D.) polyethylene
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Pneumatic Fitting:
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Removeable brass barbed fittings for Main and Branch in machined aluminum manifold
Plugged 1/8-27-FNPT gauge port | Gauge installed at additional cost
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Gauge Pressure Range (Gauge Models):
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0-30 psig (0-200 kPa)
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Gauge Pressure Accuracy (Gauge Models):
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± 2.5% Midscale (± 3.5% Full Scale)
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Operating Temperature Range:
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35 to 120°F (1.7 to 48.9°C)
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Operating Humidity Rage:
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10 to 95% non-condensing
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Storage Temperature:
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-20 to 150°F (-28.9 to 65.5°C)
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Snaptrack Material:
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Polyvinyl Chloride (PVC)
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Snaptrack Flammability Rating:
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UL94 V-0
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Product Dimensions:
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No Gauge: (L) 3.25” (W) 2.18” (H) 1.87” (82.55 x 55.37 x 47.49 mm)
With Gauge: (L) 3.25” (W) 2.18” (H) 2.95” (82.55 x 55.37 x 74.9 mm)
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Product Weight:
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PXP1.3: 0.40 lbs. (0.1814 Kg) | PXP2.3: 0.47 lbs. (0.2126 Kg) | PXP1.3G: 0.49 lbs. (0.2211 Kg)
PXP2.3G & PXP2.3GFS: 0.59 lbs. (0.2693 Kg)
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Agency Approvals:
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RoHS2, WEEE
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STANDARD
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ORDERING | ||||
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Model #
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Item #
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Supply
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Exhaust
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Gauge
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Additional Information
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PXP0.3
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127205
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No Air Consumption
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- |
No Bleed Ori ce, Requires Downstream Bleed
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PXP0.3G
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127206
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No Air Consumption
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- | + |
No Bleed Ori ce, Requires Downstream Bleed
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PXP1.3
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127207
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750 SCIM (12.29 Liters)
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73 SCIM (1.196 Liters)
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0.010” Bleed Orifice
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PXP1.3G
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127208
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750 SCIM (12.29 Liters)
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73 SCIM (1.196 Liters)
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+ |
0.010” Bleed Orifice
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PXP2.3
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127209
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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Maintains Branch Pressure
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PXP2.3G
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127213
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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+ |
Maintains Branch Pressure
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PXP5.3
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127215
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750 SCIM (12.29 Liters)
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14 SCIM (0.229 Liters)
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0.005” Bleed Orifice
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PXP5.3G
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127216
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750 SCIM (12.29 Liters)
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14 SCIM (0.229 Liters)
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+ |
0.005” Bleed Orifice
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PXP7.3
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127217
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750 SCIM (12.29 Liters)
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41 SCIM (0.671 Liters)
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0.007” Bleed Orifice
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PXP7.3G
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133044
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750 SCIM (12.29 Liters)
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41 SCIM (0.671 Liters)
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+ |
0.007” Bleed Orifice
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PXP2.3FS
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127210
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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Exhausts on Power Failure
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PXP2.3GFS
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127211
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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+ |
Exhausts on Power Failure
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PXP2.3LG
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127214
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1400 SCIM (22.94 Liters)
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1400 SCIM (22.94 Liters)
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+ |
Maintains Branch Pressure, High Flow
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ACCESSORIES
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Model #
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Item #
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Description
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A/DO008
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142583
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Transient Voltage Suppressor, Bi-directional, 56 VAC/DC, 1500W
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A/DRC 2.7 X 2.18
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142626
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DIN Rail Adapter Kit
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A/PN002
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136499
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10-32 X 1/8" ID, Barb Fitting
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A/PN004
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110831
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80-100 Micron Filter Media in Barb Fitting
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A/PN021
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112219
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In Line 10 Micron Filter, Installs in-between air supply and main barb connection
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A/PN023
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129675
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0.005" Replacement Copper Orifice
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A/PN024
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128100
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0.007" Replacement Brass Orifice
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A/PN025
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128102
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0.010" Replacement Brass Orifice
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A/PN028
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128307
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Replacement Gauge
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ENC1
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102472
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20 Gauge Metal Enclosure, Designed to Hold Interfaces Products
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EPC Analog to Pneumatic Output
The EPC Series are electric to pneumatic transducers which convert an analog input signal to a proportional pneumatic output, modulating its control valve(s) to regulate the branch line pressure to the set point determined by the input signal. The EPC series oers four selectable input ranges. Output pressure ranges are jumper shunt selectable and adjustable in all ranges. A feedback signal indicating the resultant branch line pressure is also provided. EPC Series is designed with electrical terminals on one end and pneumatic connections on the other, allowing for maximum convenience in wiring and tubing installation when panel mounted. The EPC is a constant bleed interface with branch exhaust response time determined by the bleed orice size and pressure dierentials. If power fails to the EPC, it will continue to bleed through the bleed orice until branch pressure is zero psig. The EPC2 incorporates two valves (one controls exhaust), does not bleed air at set point, and has a 750 scim supply and exhaust. Its branch exhaust ow and response time are not limited by an internal restrictor and are similar to its load rate. EPC2LG operates as the EPC2, but has a higher air ow rate (1400 scim) using an external 5 micron lter, and includes a 0-30 psi gauge. If power fails to the EPC2 or EPC2LG, branch line pressure remains constant if the branch line does not leak air. The EPC2FS shares the same specications as the EPC2 except its 3-way branch valve will exhaust branch line air upon power failure. Custom calibration is available upon request for an additional charge. This will speed up installation time for the end user.
Applications: 3 Way Mixing Valve Control, Chiller Loading, Pilot Positioner Control, Pneumatic Valve & Damper Actuator Control, Fan Vane Control, DDC Control, Above Ceiling Applications (Mixing & VAV Boxes)
The EPC is covered by ACI's Two (2) Year Limited Warranty. The warranty can be found in the front of ACI's Sensors & Transmitters catalog, as well as on ACI's website, www.workaci.com.
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PRODUCT SPECIFICATIONS
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Supply Voltage:
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24 VAC (+/-10%), 50 or 60Hz, 24 VDC (+10%/- 5%)
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Supply Current:
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180 mA maximum, 200 mA on fail safe models
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Input Signal Source (@ Impedance):
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0-5 VDC @ innite Ω | 0-10 VDC @ innite Ω | 0-15 VDC @ innite Ω | 0-20 mA / 250Ω
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Feedback Signal Output Range:
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0-5 VDC = Output Span
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Output Pressure Range:
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Field Calibration Possible: 0 to 20 psig (0-138 kPa) maximum
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Output Pressure Range-Jumper Selectable:
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0-10 psig (0-68.95 kPa), 0-15 psig (0-103.43 kPa) or 0-20 psig (137.9 kPa)
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Air Supply Pressure:
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Maximum: 28 psig (193.06 kPa), minimum 22 psig (151.69 kPa)
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Air Consumption:
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See Ordering Grid
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Output Pressure Accuracy:
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1% room temperature | 2% full scale across operating temperature range
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Manual / Auto Override:
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MAN function = output can be varied | AUTO function = output is controlled from input signal
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Manual / Auto Override Switch:
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Dry Contacts: 24 VDC/VAC @ 1A maximum, N.O. in AUTO operation (Optional: N.O. in MAN operation)
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Air Flow:
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Supply valves @ 25 psig (172.38 kPa) main/20 psig (137.9 kPa) out, 750 scim (1400, LG model) Branch Line requires 2 in3 / 33.78 cm3 (min.) | Min. 25 ft of 1/4” O.D. poly branch tubing
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Filtering:
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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)
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Connections:
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90° Pluggable Screw Terminal Blocks
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Wire Size:
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16 (1.31 mm ) to 26 AWG (0.129 mm )
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Terminal Block Torque Rating:
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0.5 Nm (Minimum); 0.6 Nm (Maximum)
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Connections | Pneumatic Tubing Size-Type:
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1/4" O.D. nominal (1/8” I.D.) polyethylene
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Pneumatic Fitting:
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Removeable brass barbed fittings for Main and Branch in machined aluminum manifold
Plugged 1/8-27-FNPT gauge port
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Gauge Pressure Range (Gauge Models):
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0-30 psig (0-200 kPa)
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Gauge Pressure Accuracy (Gauge Models):
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± 2.5% Midscale (± 3.5% Full Scale)
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Operating Temperature Range:
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35 to 120°F (1.7 to 48.9°C)
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Operating Humidity Rage:
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10 to 95% non-condensing
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Storage Temperature:
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-20 to 150°F (-28.9 to 65.5°C)
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Snaptrack Material:
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Polyvinyl Chloride (PVC)
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Snaptrack Flammability Rating:
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UL94 V-0
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Enclosure Option (Box Option):
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Painted steel housing has mounting ange with four holes for sheet metal screws
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Product Dimensions:
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See table on back of product data sheet
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Product Weight:
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EPCG: 0.46 lbs. (0.2069 Kg) | EPC2G: 0.70 lbs. (0.3175 Kg) | EPC2GFS: 0.68 lbs. (0.309 Kg) EPC2GB: 1 lbs 1 oz. (0.482 Kg) | EPC2GFSB: 0.96 lbs. (0.436 Kg)
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Agency Approvals:
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RoHS2, WEEE
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STANDARD
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ORDERING
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Model #
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Item #
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Supply
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Exhaust
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Gauge
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Additional Information
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EPC
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102475
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750 SCIM (12.29 Liters)
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41 SCIM (0.6719 Liters) |
0.007” Bleed Orifice
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EPCG
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102480
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750 SCIM (12.29 Liters)
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41 SCIM (0.6719 Liters) | + |
0.007” Bleed Orifice
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EPC2
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102476
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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Maintains Branch Pressure
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EPC2G
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102478
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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+ |
Maintains Branch Pressure
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EPC2FS
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102477
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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Exhausts on Power Failure
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EPC2GFS
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102479
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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+ |
Exhausts on Power Failure
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EPC2LG
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106325
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1400 SCIM (22.94 Liters)
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1400 SCIM (22.94 Liters)
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+ |
Maintains Branch Pressure, High Flow
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EPC2GB
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106326
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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+ |
Enclosed in Steel Housing, Maintains Branch Pressure
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EPC2GFSB
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106327
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750 SCIM (12.29 Liters)
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750 SCIM (12.29 Liters)
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+ |
Enclosed in Steel Housing, Exhausts on Power Failure
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ACCESSORIES
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Model #
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Item #
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Description
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A/DO008
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142583
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Transient Voltage Suppressor, Bi-directional, 56 VAC/DC, 1500W
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A/DRC 2.7 X 3.25
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142624
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DIN Rail Adapter Kit
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A/PN002
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136499
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10-32 X 1/8" ID, Barb Fitting
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A/PN004
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110831
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80-100 Micron Filter Media in Barb Fitting
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A/PN021
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112219
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In Line 10 Micron Filter, Installs in-between air supply and main barb connection
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A/PN028
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128307
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Replacement Gauge
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Interface Device Selection Matrix
Select your controller’s signal output in the column on the left (Your Signal). Then, select the output required by the actuator or other device, in the row across the top of the matrix (Signal Required). Some scenarios require two devices to reach the desired output and include a “+” between them. Refer to the detailed product speci cations in the Interface Device section of the ACI Binder Catalog or visit www.workaci.com.
