477
Current to Pressure
Transducers
VALVES
ELECTRO-PNEUMATIC TRANSDUCERS
Low Cost, Selectable Input/Output, Manual Override
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]
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 to 5 VDC feedback signal
indicating the resultant branch line pressure. Universal 24 VAC/24 VDC supply voltage
and eld-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 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
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: 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 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% FS @ room
temperature; ±2.0% FS @ 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).
EPTA-B EPTA-S
Shown with snap-track mounting Shown with metal bracket mounting
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]
CURRENT TO PRESSURE TRANSDUCER
Intrinsically Safe, NEMA 4X Enclosure, Field Reversible, Low Cost
1/2 NPT
FEMALE
1-1/2
[38.10]
35/64
[13.97]
4-1/4
[107.70]
1-7/16
[36.58]
2-3/16 SQ
[55.37]
1-1/2
[38.10]
1/4 NPT FEMALE
The Series IP Current to Pressure Transducer converts a current input signal to a
linearly proportional pneumatic output pressure. The features include built-in volume
booster, low air consumption, eld reversible (provides output which is inversely
proportional to input signal) and exible zero and span adjustments. The rugged
NEMA 4X enclosure allows splashdown and outdoor installation. The IP can be used
for applications that require operation of valve actuators, pneumatic valve positioners,
damper and louver actuators, nal control elements and relays.
FEATURES/BENEFITS
• Built-in volume booster
• Low air consumption
• Flexible zero plus span adjustments
• NEMA 4X enclosure
• Field reversible
SPECIFICATIONS
Service: Oil free, clean dry air ltered to 40 microns.
Input Signal: 4 to 20 mA.
Input Impedance: IP-42: 180 ohms; IP-43 and IP-44: 220 Ω.
Air Pressure: Min: 3 psig (21 kPa) above max output; Maximum: 100 psig (700
kPa).
Linearity: < ±0.75% of span.
Hysteresis: < 1% of span.
Repeatability: < 0.5% of span.
Supply Pressure Sensitivity: < ±0.1% of span per psig (< ±0.15% of span per 10
kPa).
Power Requirements: Loop-powered.
Temperature Limits: -20 to 140°F (-30 to 60°C).
Pressure Connections: 1/4˝ female NPT.
Electrical Connection: 1/2˝ female NPT.
Air Consumption: 0.03 SCFM (0.5 m3/h) typical.
Output Capacity: 4.5 SCFM (7.6 m3/h ANR) at 25 psig (175 kPa) supply; 12
SCFM (20 m3/h) at 100 psig (700 kPa) supply.
Relief Capacity: 2 SCFM (3.4 m
3
/h) at 5 psig (35 kPa) above 20 psig (140 kPa)
setpoint.
Weight: 2.1 lb (0.94 kg).
Agency Approvals: CE, FM.
SERIES EPTA | PROXIMITY
®
BY DWYER
®
SERIES IP | PROXIMITY
®
BY DWYER
DWYER INSTRUMENTS, INC. | dwyer-inst.com
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
APPLICATIONS
• Pneumatic dampers and valve actuators
APPLICATIONS
• Applications that require the operation
of valve actuators, pneumatic valve
positioners, damper and louver
actuators, nal control elements, relays,
air cylinders, web tensioners, clutches
and brakes
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
ACCESSORIES
Model Description
A-400
A-403
DIN mounting kit
Replacement integral barb lter
MODEL CHART
Model
Input
Ranges
Output Range
psi kPa
IP-42
IP-43
IP-44
4 to 20 mA
4 to 20 mA
4 to 20 mA
3 to 15
3 to 27
6 to 30
20 to 100
20 to 185
40 to 200