Maintenance and Check
① After installation, repair and disassembling, connect compressed air and perform a proper
function test and leak test. If bleed noise is louder than the initial state or operation is
abnormal, stop operation and check if installation is proper or not. Modification of electrical
construction is prohibited due to maintaining Explosion-Protected construction function.
① Check if supply air is clean. Inspect compressed air cleaning system periodically and maintain
keep condition to always get supply clean air so that dust, oil and humidity which cause
malfunction and failure do not enter the equipment.
② If handled improperly, compressed air can be dangerous. Maintenance and replacement of
unit parts should be performed only by trained and experienced personnel for instrumentation
equipment as well as following the product specifications.
③ Check the positioner once a year. When you find excessively worn diaphragm. O-ring and
other seals or any unit that has been damaged replace with new units. Treatment at an
early stage is especially important if the positioner is used in a place of severe
environment like coastal area.
④ Before removing the positioner for maintenance or replacing unit parts after installation, make
sure the supply pressure is shut off and all residual air pressure is released from piping.
⑤ When the fixed orifice is clogged with carbon particles or others, remove the pilot valve
unit Auto/Manual switch screw (built-in fixed orifice) and clean it by inserting a φ0.2 wire
into the aperture. If it must be replaced with new one, stop the supply pressure and
remove the stopper screw of the pilot valve unit.
⑥ The pilot valve unit (P565010-303) should be replaced in accordance with the following
instructions. As a standard, it should be replaced every 3 years.
1. Shut off the supply pressure and input current to the positioner.
2. Remove the body cover unit with a phillips head screwdriver.
3. Loosen the 4 pieces of the M4 screws fixing the pilot valve unit and remove it.
4. After the pilot valve unit has been removed, it should be reassembled in the order
of 3 to 1.
⑦ When the pilot valve unit is disassembled, apply a small amount of specified grease to
the sliding surface.
⑧ Check air leak from piping which compressed air flows. Air leak from air piping could
deteriorate characteristics. Air is normally discharged from a bleed port, but this is a necessary
air consumption based on the construction of the positioner, and is not an abnormality if the air
consumption is within the specified range.
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