Page 1
AINLESS STEEL
SERIES 185 & 285
E
LINEAR AND ROTARY SMART POSITIONERS
VALVES
Fail Freeze, Linear and Rotary Operation, HART® Communication
3-27/32
[97.50]
3-1/64
[76.50]
CONDUIT ENTRY
1/2 NPT
3-47/64
[95.00]
2-11/32
[59.60]
4-7/64
[104.20]
8-31/64 [215.70]
2-33/64
[64.00]
SUPPLY
1/4 NPT
4-13/32
[111.90]
ST
4-31/64
[113.8]
STANDARD
185
3-27/32
[97.50]
1-49/64
[45.00]
E
O
D
I
V
O
N
285
L
I
N
Proximity Series 185 & 285 Linear and Rotary Smart Positioners combine an easy
to use, high performance unit with a low price. Series 185 models accurately control
the valve stroke of linear motion valves and Series 285 models accurately control
the valve stroke of rotary motion valves. An analog feedback signal is outputted to
stabilize any valve system, and easy to use functions such as auto calibration ensure
Positioners
the accuracy of the unit. The compact design of this unit makes it easy to use with any
size actuator. Smart Positioners feature a LCD screen attached to the outer surface
of the unit, allowing for an easy inspection of the positioner condition while in the eld.
Available in user selectable single or double action, with HART
®
communication as
standard. In the event that the 4-20 mA input signal is lost the 185 and 285 will fail in
place.
BENEFITS/FEATURES
• User selectable single or double action
• LCD display
APPLICATIONS
• Linear motion valves or rotary motion valves with single or double acting actuators
1-1/8
[28.50]
185
2-CONDUIT ENTRY 1/2 NPT
3-49/64
[95.80]
4-31/64
[113.80]
STANDARD
STAINLESS STEEL
4.406
[111.9]
1-23/64
[34.60]
1-7/64
[28.00]
2-33/64
[64.00]
8-15/32 [215.00]
4-7/64
[104.20]
285
SPECIFICATIONS
Input Signal: 4-20 mA DC.
Input Impedance: 460 Ω max @ 20 mA DC.
Enclosure Material: Aluminum or 316 SS.
Air Supply: 35 to 116 psi (2.4 to 8 bar).
Air Connection: 1/4˝ NPT.
Gage Connection: 1/8˝ NPT.
Conduit Connection: 1/2˝ NPT.
Linearity: ±0.5% FS.
Hysteresis: ±0.5% FS.
Sensitivity: ±0.2% FS.
Repeatability: ±0.3% FS.
Air Consumption: .0004 scfm (.01 LPM) at 20 psig (1.4 bar) supply.
Flow Capacity: 2.1 scfm (60 LPM) at 20 psig (1.4 bar) supply.
Stroke: 0.5 to 6˝ (10 to 150 mm) or 0 to 90°.
Enclosure Rating: NEMA 4X (IP66).
Temperature Limits: -22 to 185°F (-30 to 85°C).
Weight: 3.3 lb (1.5 kg); SS models: 6.4 lb (2.9 kg).
MODEL CHART
Model Communication Enclosure
185EL-S1
285ER-S5
285ER-D5
285ER-S5SS
DWYER INSTRUMENTS, LLC | dwyer-inst.com444
HART
HART
HART
HART
®
®
®
®
Aluminum
Aluminum
Aluminum
SS
HART® is a registered trademark of Fieldcomm Group, Inc.
Regulators: See page 446
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