Dwyer Instruments SERIES EPTA Catalog Page

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SERIES EPTA | PROXIMITY® BY DWYER

ELECTRO-PNEUMATIC TRANSDUCERS

Low Cost, Selectable Input/Output, Manual Override

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EPTA-B EPTA-S

The Series EPTA Electro-Pneumatic Transducers convert 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 lter, a 0 to 30 psi analog gage,
an anodized aluminum manifold, and brass barbed ttings. 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 eld-selectable 0
to 10, 0 to 15, and 0 to 20 psig. Also included is an analog 0-5 VDC feedback signal
indicating the resultant branch line pressure. Universal 24 VAC/24 VDC supply voltage
and eld-selectable 4-20 mA, 0-5 VDC, 0-10 VDC, or 0-15 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 congurations 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.

FEATURES/BENEFITS

• Adjustable span and offset

• Manual override

• Field selectable output ranges

• Not position sensitive

MODEL CHART
Model Description
EPTA-S0

EPTA-B0
EPTA-S1
EPTA-B1

Standard snap-track mount transducer
Standard metal bracket mount transducer
Snap-track mount transducer with fail-safe
Metal bracket mount transducer with fail-safe

APPLICATIONS

• Pneumatic dampers and valve actuators

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SPECIFICATIONS
Service: Clean dry air or any inert gas.

Input Signal: DC current (4-20 mA) or

DC voltage (0-5/0-10/0-15).
Input Impedance: Current: 250 Ω;
Voltage: Innite.
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: 0-5 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% FS @ room
temperature; ±2.0% FS @ 32 to 120°F
(0 to 48.8°C).

ACCESSORIES
Model Description
A-400

A-403

USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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DIN mounting kit
Replacement integral barb lter

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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).

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VALVES

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Current to Pressure