Digital Input to Pressure Output

Selectable Pulse to Pressure Transducers

Product Data

ACI/EPW Series

Features
* Analog feedback for branch pressure
* 2% accuracy closed loop control
* De-pluggable Terminal Blocks
* Not Position Sensitive-Mount in any position
* 50 and 60 Hz Compatible
* Anodized aluminum manifold
* Supplied with Filter-in-barb

Product Description

The ACI/EPW converts a pulse, phase cut, or digital PWM signal into a proportional pneumatic signal ranging from 0-20 psig. The pneumatic output is proportional to the signal input, your choice of direct or reverse acting. The EPW has a manual override potentiometer to vary the pneumatic output and two LED’s, one for power and one for signal status indication.

The EPW offers jumper selectable input timing ranges of 0.1 to 10 seconds, 0.02 to 5 seconds, 0-1 to 25 seconds, 0.59 to 2.93 seconds, 0.023 to 6 seconds, 0 to 10 seconds Duty Cycle Version and 20V StaefaTM Phase Cut.

Output pressure ranges are jumper shunt selectable to 0 to 10, 0 to 15 and 0 to 20 psig, and adjustable in all ranges.

A 0-5 VDC feedback signal indicating the resultant branch pressure is also provided. This signal varies linearly with branch pressure range selected. EPW 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.

Three basic configurations are available:

The EPW is a constant bleed interface with branch exhaust response time determined by the bleed orifice size and pressure differentials. If power fails to the EPW, it will continue to bleed through the bleed orifice until branch pressure is 0 psig.

The EPW2 incorporates two valves (one controls exhaust) and does not bleed air at set point. Its branch exhaust flow and response time are not limited by an internal restrictor and are similar to its load rate. If power fails to the EPW2, branch line pressure remains constant if the branch line does not leak air.

FAIL SAFE: The EPW2FS is a two-valve fail-safe model. Its 3-way branch exhaust valve allows exhaust of branch line air on a power failure.

Product Specifications

Supply Voltage	24 VDC (+10% / -5%) or 24 VAC (+/- 10%), 50 or 60 Hz	Pulse Trigger Level / Impedance Off Time Between Pulses	9 to 24 VAC or VDC @ 75 Ohms 10 milliseconds minimum
Supply Current	50 mA, 150 mA max. (standard model) 200 mA max. (fail-safe model)	Feedback Signal Output	0 to 5 VDC = Output Span
Output Pressure Range (DA or RA):	0 – 10 (0 – 69 KPa), 0 – 15 (0 – 103 KPa),} 0 – 20 (0 – 138 KPa) psig	Pneumatic Tubing Size	¼” O.D. nominal polyethylene Minimum 25 feet of ¼” O.D. polyethylene tubing
Output Pressure Accuracy:	+/- 2% @ Room Temp ( >1 psi (6.895 KPa) ) +/- 3% FSO full scale over operating Temp. Range ( >1 psi (6.895 KPa) )	Operating Temp. Range Operating Humid. Range	32 to 120 deg F (0 to 48.8°C) 5 to 95% non-condensing

Dimensions

Ordering Information

	Valve Type	Program- Rate of Change	Gauge
A/	[ ]	[ ]	[ ]

	EPW	Version #1	( ) No Gauge (Std)
	EPW2	Version #2	(G) With Gauge
	EPW2FS	Version #4

		Version #1 Timing Ranges	0.1 to 10 sec in 0.1 increments
			0.02 to 5 sec in 0.02 increments
			0.1 to 25.5 sec in 0.1 increments
			0.59 to 2.93 sec in 0.1 increments
		Version #2 Timing Ranges	0.23 to 6 seconds
			0 to 10 sec. Duty Cycle Pulse measured in 10 sec window
		Version #4 Timing Ranges	Same Timing as Version #1 only Reverse Acting

Example: A/EPW2-Version 1-G or A/EPW - Version 2

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Supply Voltage