No to uc h – Dwyer 285 User Manual
Page 3
6. Insert the connection bar attached on the actuator clamp into the slot of Series
185’s feedback lever. In order to reduce hysteresis, it should appear as shown:
7. Check that the Series 185’s feedback lever is level at 50% of valve stroke. If not,
move bracket or feedback link until it is level. Product linearity becomes work if
Series 185 is installed without being level at 50% of valve stroke.
8. Check valve stroke. The numbers indicating stroke are carved in the Series 185’s
feedback lever. Set the connection bar attached on the actuator clamp to the
number on the feedback lever applicable to valve stroke as shown in the following
picture. To set the connection bar and the number, move the bracket attached on
Series 185 or connection bar from side to side.
NOTE: After installation, operate the valve from 0 to 100% stroke using an air filter
regulator on the actuator. When the stroke is both 0 and 100%, the feedback lever
should not reach to the lever stopper on the backside of the Series 185 unit. If the
feedback lever reaches the lever stopper, move attachment of Series 185 away
from the yoke center.
9. Once the Series 185 is installed according to the above procedures, tighten the
bolts and nuts of the bracket and feedback lever connection bar completely.
Series 285 Installation
Series 285 is designed for rotary motion valves such as Dwyer Instruments’ ball
and butterfly valves using rack and pinion, scotch yoke or complex type actuators
whose stem is rotated 90°. Series 285 positioners consist of the following
components:
Series 285 main body
Fork lever and lever spring to attach on actuator
1 bracket
Four hex bolts M8x1.25P
Four M8 plate washers
Series 285 Installation Example of Fork Lever
60
50
40
90
°
50%
LCD SCREEN
SMART POSITIONER
30
10
20
40
50
60
70
150
140
130
120
110
100
90
80
40
20
10
30
80
90
100
110 120 130
140 150
70
60
50
No
To
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Stroke 40 mm
Stroke 90 mm