Need assistance? Call us: 1-800-663-4209
Series-EFP
Floating Point to Pneumatic Output Transducer for 22 to 25 psig Air Supply Pressure
- Converts floating point control to pneumatic output: EFP modules translate floating point input signals into proportional pneumatic pressure for legacy pneumatic control systems.
- Selectable pressure ranges: Jumper-selectable outputs support 0-10 psig, 0-15 psig, or 0-20 psig, with adjustable calibration for matching the controlled device.
- Ideal for HVAC pneumatic control: Well suited for 3-way mixing valves, chiller loading, pilot positioners, pneumatic valve and damper actuators, fan vane control, and compressor staging.
- Flexible input support: Accepts relay contact closure, transistor, or triac signals, making it compatible with a wide range of controllers.
- Built-in feedback signal: Provides a 0-5 VDC feedback output proportional to branch line pressure for monitoring and verification.
- Manual override for service: Manual/auto switch and potentiometer let technicians vary pneumatic output locally during checkout, setup, or troubleshooting.
- Multiple operating models: Choose standard constant-bleed, EFP2 branch-pressure-holding, or EFP2FS fail-safe exhaust models depending on application needs.
- Installer-friendly layout: Electrical terminals on one end and pneumatic fittings on the other simplify wiring and tubing in panel-mounted installations.
- Reliable panel package: Snaptrack mounting, optional gauge models, LED status indicators, RoHS2/WEEE compliance, and ACI’s two-year warranty support dependable field use.
Product Overview
- Accuracy Detail Output Pressure Accuracy: 2% full scale at room temperature (above 1 psig or 6.895 kPa) 3% full scale across operating temperature range (above 1 psig); Gauge Pressure Accuracy (Gauge Models): ± 2.5% Midscale (± 3.5% Full Scale)
- Air Supply Pressure, Max 28 psi
- Air Supply Pressure, Min 22 psi
- Applications Air and HVAC, Building and Maintenance, Environmental Monitoring, Pneumatic Systems
- Approvals RoHS2, WEEE
- Auto/Manual function Manual / Auto Override Switch: MAN function = output can be varied
- Control Valve 1 Valve
- Electrical Connection Screw Terminal
- Filter Furnished with integral-in-barb 80-100 micron lter (Part # PN004) Optional standard barb (PN002) with external 5 micron in-line lter (PN021)
- Height 2.95 in
- Input Note Digital Input Signal Source: Relay Contact Closure, Transistor or Triac; Digital Input Signal Level (@ Impedance): 9-24 VAC/VDC @ 750Ω; Digital Input Rates of Change: See Ordering Grid
- Input Type Floating Point
- Length 4 in
- Materials PVC
- Operating Humidity 10 to 95% RH, non-condensing
- Operating Temperature, Max 120 °F
- Operating Temperature, Min 35 °F
- Output Note Feedback Output Signal Range: 0-5 VDC = Output Span
- Output Pressure Range 0 to 10 psi, 0 to 15 psi, 0 to 20 psi
- Pressure Note Gauge Pressure Range (Gauge Models): 0-30 psig (0-200 kPa), Output Pressure Range (Jumper Selectable): 0-10 psig (0-68.95 kPa), 0-15 psig (0-103.43 kPa) or 0-20 psig (137.9 kPa)
- Pulse Measurement Range 45 sec, 90 sec, 1min, 2min
- Series ID Series-EFP
- Storage Temperature, Max 150 °F
- Storage Temperature, Min -20 °F
- Supply Current 50 mA
- 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 3.25 in
- Wire Gauge 26 to 16 AWG
Supported Applications
The ACI Series EFP Floating Point to Pneumatic Output Transducer converts a floating point signal into a proportional pneumatic signal ranging from 0-20 psig. The series is designed for applications including 3 Way Mixing Valve Control, Chiller Loading, Pilot Positioner Control, Pneumatic Valve and Damper Actuator Control, Fan Vane Control, and Compressor Staging.
Operating Conditions & Performance
The transducer operates with an air supply pressure of a maximum 28 psig (193.06 kPa) and minimum 22 psig (151.69 kPa). Output pressure ranges are jumper selectable for 0-10 psig, 0-15 psig, or 0-20 psig. Accuracy is specified as 2% full scale at room temperature (above 1 psig or 6.895 kPa) and 3% full scale across the operating temperature range (above 1 psig). The device operates within an ambient temperature of 35 to 120°F (1.7 to 48.9°C) and a humidity range of 10 to 95% non-condensing.
Power requirements are 24 VAC (+/-10%), 50 or 60Hz, or 24 VDC (+10%/-5%). The digital input signal level is 9-24 VAC/VDC @ 750Ω. A feedback output of 0-5 VDC = Output Span indicates the resultant branch line pressure.
Performance by Model Variant
- EFP: Constant bleed interface; exhaust response time determined by bleed orifice size and pressure differentials. If power fails, it continues to bleed until branch pressure is 0 psig.
- EFP2: Two-valve design that does not bleed air at set point and maintains branch pressure on power failure.
- EFP2FS: Fail-safe model with a three-way exhaust valve for safe branch line air exhaust on power failure.
Digital Input Rates of Change
Rates are selectable via jumpers and vary by firmware version:
- EFP / EFP2 (Version 1): 45s, 90s, 1 min, 2 min.
- EFP2 Version 2: 30s, 3 min, 6 min, 8 min.
Configuration Options
The series offers configurable options for mounting, filtration, and monitoring. Electrical connections utilize 90° Pluggable Screw Terminal Blocks compatible with wire sizes from 16 (1.31 mm²) to 26 AWG (0.129 mm²). Pneumatic tubing size is 1/4" O.D. nominal (1/8" I.D.) polyethylene.
Mounting and Housing
- Gauge Models: Available with a miniature pressure gauge (0-30 psig range, ± 2.5% Midscale accuracy).
- DIN Rail Adapter Kit: Optional accessory for DIN rail mounting.
Filtration and Accessories
- Furnished with integral in-barb 80-100 micron filter (Part # PN004).
- Standard barb (PN002) available for use with an external 5 micron or 10 micron in-line filter (PN021), depending on the source document.
- Transient Voltage Suppressor, Bi-directional, 56 VAC/DC, 1500W (Part # A/D0008) available for shared power circuits with inductors.
Status Indication
The unit features LEDs to indicate status:
- UP LED On / DOWN LED Off: Ramping Up.
- UP LED Off / DOWN LED On: Ramping Down.
- Fast Blink (UP) / Fast Blink (DOWN): Maximum or Minimum Output respectively.
- Slow Blink Both: Output Holding.
Key Product Differences
The Series EFP includes distinct model families based on valve configuration and fail-safe requirements:
- EFP / EFPG: Single-valve constant bleed models. The "G" suffix denotes the inclusion of a pressure gauge.
- EFP2 / EFP2G: Two-valve models that maintain branch pressure and do not bleed at set point. Includes optional Version 2 firmware with extended rates of change (30s to 8 min).
- EFP2FS / EFP2GFS: Fail-safe versions incorporating a three-way exhaust valve for safe air exhaust upon power loss.
All models feature a Manual/Auto Override switch. In MAN function, output can be varied; in AUTO function, output is controlled from the input signal. The ZERO potentiometer is factory calibrated and should not be adjusted.
PDFs & Manuals
Show Ratings & Reviews
