Structure
The structure of the 195 is shown below. The Series 295 structure is the same as
the linear model without the feedback lever.
Installation
Tools For Installation
• Hexagonal wrenches
• (+) Screw driver
• (-) Screw driver
• Spanners for hexagon head bolts
Series 195 Installation
Series 195 is used for linear motion valves, such as Dwyer Instruments globe
valves, using a spring return type diaphragm actuator or piston actuator. The Series
195 consists of the following components. Be sure that all the components are
included.
• Series 195 main body
• Feedback lever and lever spring
• Flange nut (attached on the bottom of main shaft of Series 195 body)
• Four hexagon head bolts M8x1.25P
• Four M8 plate washers
Installing Series 195 with Bracket
It is necessary to make a proper bracket to attach on the actuator yoke.
The most important considerations in the design of the bracket are as follows:
• Series 195 feedback lever should be at 50% of valve stroke.
• Feedback level connection bar of actuator clamp should be connected in the
position so that the valve stroke and the numbers carved on feedback lever are
fitted.
If the bracket meets the above conditions, Series 195 can be installed very easily.
2. Assemble Series 195 and bracket with bolts. Use standard bolts in bolt holes on
the backside of the unit.
3. After assembling Series 195 and bracket with bolts, attach it using the bolt holes
of the actuator yoke. Do not tighten completely. There must be some space.
4. Install the bar connected with Series 195’s feedback lever on the actuator clamp.
The slot length between Series 195’s feedback lever is .26˝ (6.5mm), so the
diameter of the connection bar should be less than .25˝ (6.3 mm).
5. Connect the air filter regulator with the actuator temporarily. Set supply pressure
of air filter so that the actuator clamp is positioned at 50% of valve stroke.
6. Insert the connection bar attached on the actuator clamp into the slot of Series
195’s feedback lever. In order to reduce hysteresis, it should appear as shown:
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50
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100
50
Series 195 Installation Example
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100
50
When the positioner is replaced or installed with the actuator,
make sure of the following:
• All inputs and supply pressure to the valve, actuator and other instruments must
be shut down.
• The control valve must be separated from the system with a bypass valve or other
equipment so that the entire system does not shut down.
• No pressure remains in the actuator.
NOTICE
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