Pressure to Current

Transducer

VALVES

517

Electro-Pneumatic Transducer

Low Cost, Selectable Input/Output, Manual Override

Series

EPTA

The Series EPTA is an electric to pneumatic transducer that converts an analog input

signal to a linearly proportionate pneumatic output by modulating its control valves to

regulate branch line pressure to the set point determined by the input signal. All models

incorporate two low voltage valves, an integral in-barb filter, a 0 to 30 psi analog gauge, an

anodized aluminum manifold, and brass barbed fittings. The EPTA offers adjustable span

and offset as well as manual override. This unit has no air consumption and is immune to

mounting orientation. Output pressure ranges include field-selectable 0 to 10, 0 to 15, and

0 to 20 psig. Also included is an analog 0 to 5 VDC feedback signal indicating the resultant

branch line pressure. Universal 24 VAC/24 VDC supply voltage and field-selectable 4 to 20

mA, 0 to 5 VDC, 0 to 10 VDC, or 0 to 15 VDC inputs ensure single unit compatibility with

most systems. The standard models maintain branch pressure on power loss while the Fail-

Safe models will drop the branch pressure to 0 psi on power loss. Mounting configurations

include a metal bracket mount in the EPTA-B models and a snap-track mount in the EPTA-

S models. The A-400 accessory kit will allow the EPTA-S models to be mounted on a

standard DIN rail.

SPECIFICATIONS

Service: Clean dry air or any inert gas.

Input Signal: DC current (4 to 20 mA) or DC voltage (0-5/0-10/0-15).

Input Impedance: Current: 250 Ω; Voltage: Infinite.

Output Signal: Jumper selectable 0 to 10 psig (0 to 69 kPa), 0 to 15 psig (0 to 103

kPa), or 0 to 20 psig (0 to 138 kPa).

Feedback Output: 0 to 5 VDC.

Air Supply: 25 psig (172 kPa) max.

Air Flow: 750 scim.

Air Consumption: 0 scim normal operation, fail-safe model vents to 0 psi on

power loss.

Accuracy: ±1.0% full-scale @ room temperature; ±2.0% full-scale @ 32 to 120°F

(0 to 48.8°C).

Supply Voltage: 24 VDC (+10%/-5%) or 24 VAC (±10%) 50/60 Hz.

Supply Current: 180 mA max, 200 mA max on fail-safe model.

Temperature Limits: Operating: 32 to 120°F (0 to 48.8°C); Storage: -20 to 150°F

(-6.7 to 65.6°C).

Operating Humidity Range: 5 to 95%, non-condensing.

Pressure Connections: 1/4˝ OD (polyethylene tubing optimum).

Electrical Connections: Plug-in block terminal type with 5 mm pin spacing.

Wire Size: Up to one 14 AWG per terminal.

Weight: EPTA-S0: 6.9 oz. (196 g); EPTA-S1: 9.2 oz. (261 g); EPTA-B: 14.5 oz.

(411 g).

Model

EPTA-S0

EPTA-B0

EPTA-S1

EPTA-B1

POWER

MANUAL

AUTO

MANUAL

0% 100%

SPAN

OFFSET

10V

15V

20mA

0-10 PSI

0-15 PSI

0-20 PSI

4X ø13/64

[ø5.16]

3-23/64

[85.33]

1-23/64

[34.53]

23/64

[9.13]

4-1/16

[103.19]

4-5/16 [109.54]

3-25/64 [86.12]

4-15/32

[113.5]

PWR C SIG FB OV OV

3/16

[4.76]

23/32

[18.26]

1/2

[12.7]

27/32

[21.43]

3-27/64

[86.92]

3-1/4

[82.55]

3 [76.20]

3-1/4 [82.55]

23/32

[18.26]

PWR C Sig FB OV OV

EPTA-S

EPTA-B Shown with snap-track mounting

Shown with metal bracket mounting

The Model PI Pressure To Current Transducer converts a pneumatic input pressure

to an accurately proportional output current with uncompromising accuracy and durability.

The PI serves in high-density and panel-mounted applications. The rugged PI transducer

offers a high density DIN rail adapters and space saving with easy plug-in installation.

Pressure To Current Transducer

Reliable, User-Oriented Performance

Model

PI-1

PI-2

17/32

[13.46]

[76.20]

1-63/64

[50.47]

3/4

[19.05]

5/16

[7.75]

[25.40]

PRESSURE INLET

1/8˝ NPT

[76.20]

3/4

[19.02]

3-7/16

[87.12]

45/64

[17.78]

5-25/32

[146.84]

5-3/8

[136.66]

MODEL NO. PI-X

SUPPLY: 10-42 VDC

MAX. TEMP: 75°C

INPUT:X-XX PSIG

OUTPUT: 4 TO 20 mA

SERIAL NO: XX-XXXX

TAG NO: XXX-XXXX

W.E. ANDERSON

A DIV OF DWYER INSTRUMENTS, INC

MICHIGAN CITY, IN USA

SPECIFICATIONS

Service: Clean dry air filtered to 40

microns.

Input Signal: 3 to 15 psig and 3 to 27

psig.

Input Capacitance: 2-wire: 700 ƒ,

standard; Voltage: 5k ƒ min.

Output: 2-wire: 4 to 20 mA.

Linearity: ±0.15% of span.

Hysteresis: ±0.15% of span max.

Accuracy: ±0.15% of span

guaranteed; ±0.10% of span typical.

Includes combined effects of linearity,

hysteresis and repeatability errors.

Repeatability: ±0.10% of span;

±0.03% of span typical.

Response Time: 10 ms to 99% of step

change.

Power Requirements: 10 to 42 VDC.

Temperature Stability: Span and

Zero: ±0.007% of span per °F max.

deviation from 77°F calibration.

Temperature Limits:

Operating: -40 to 167°F (-40 to 75°C);

Storage: -60 to 185°F (-50 to 85°C).

Calibration Adjustments: Non-

interactive, multi-turn span and zero

potentiometers with approximately

±10% of span adjustment range.

Connections:

Signal Air: 1/8˝ NPT female;

Electrical Wiring: Miniature terminal

block accepts solid or stranded wire

up to 14 AWG.

Weight: 0.5 lb (0.2 kg).

ACCESSORIES

A-400, DIN Mounting Kit

A-403, Replacement Integral Barb Filter

Description

Standard Snap-Track Mount Transducer

Standard Metal Bracket Mount Transducer

Snap-Track Mount Transducer with Fail-Safe

Metal Bracket Mount Transducer with Fail-Safe

Range

3 to15 psig (20 to 100 kPa)

3 to 27 psig (20 to 180 kPa)

PI-C, Replacement DIN Rail Adapter

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