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How To Adjust The Valve Monitor

Date:2018-09-14 03:20:04 Views:100

How To Adjust The Limit Switchbox /Valve Position Monitor

Output Adjusting
1. Important notice: When the valve monitor with position transmitter is shipped out from our plant, the rotary angle of the stem is setted under closed
position. The red point mark on the gears is under point to point position .Do not circumvolve the stem angle more than 360 degree.
2. After mounting the valve monitor on valve or actuator (should be on closed position), you can adjust the position transmitter in the line of folowing items.
2.1. Wiring the multimeter or Ampere Meter to the valve monitor according to wiring chart above. Note that the 24VDC electric supply is needed.
2.2. Check the acting type of the valve or actuator: If acting type of the valve is clockwise closed (L -Closed), please push the acting pushbutton toRA
position. lf acting type of the valve is counterclockwise closed (R-closed), please push the acting pushbutton to DA position.
2.3. Zero Adjustment: Turn the valve or the actuator to closed position, check the value of electric current of the multimeter. If it is more than 4mA, turn the
zero bolt in counterclockwise till the value to 4mA. If it is less than 4mA, turn the zero bolt in clockwise till the value to 4mA. The zero adjustable range is
±10%.
2.4. Span Adjustment: Turn the valve or the actuator to open position, check the value of electric current of the multimeter. If it is more than 20mA, turn the
span bolt in counterclockwise tilll the value to 20mA. If it is less than 20mA, turn the span bolt in clockwise till the value to 20mA. The span adjustable
range is from 30% to 150%.


Limit Switch Adjustment
1. Loosen limit switch box cover screws and remove cover.
2. Rotate actuator to full counterclockwise position. Valve is on flly open or closed position.
3. Lift up bottom cam and turn until switch is activated and then release. Engage cam back onto the splined retainer.
Spring will maintain cam engagement.
4. Rotate actuator to full clockwise position.Valve is on fully closed or open position.
5. Push down top cam and turn until switch is activated and then release. Engage cam back onto the splined retainer.
Spring will maintain cam engagement.
6. Place cover on limit switch box and tighten.
Instruction
- Take care to ensure that housing O-ring is properly located in seal groove.
- Keep the box tight while circuits are alive.
- Disconnect supply circuit before opening.
- Ensure the flameproof surface have not any paint and scratch in the process of adjustment.


Electrical Wiring
Installation
1. Remove limit switch box cover(Disconnect supply circuit before opening).
2. Remove protection plugs from conduit entries and install conduit or plugs suitable for type of protection required.
3. Engage wires in terminal strip using a small screwdriver.
- Ensure the flameproof surface have not any paint and scratch in the process of adjustment.
- All user connections are made at a numbered terminal strip. A wiring diagram is located inside the cover and indicated which terminal numbers correspond
to switch contacts: normally open, normally closed common, etc. Simply follow the wiring diagram and electric code to connect switches to your system.
- Solenoids may also be wired through the switch box. At least two auxiliay terminals are included as an option. A ground screw is also included. Simply wire
the solenoid to auxiliay terminals, and then connect power leads to the opposite terminal side.
- Be sure to properly ground the solenoid at provided ground terminal.
- Exd switch boxes include two 3l4" BSPP conduit entries. Be sure to folow the National Electric Code regulations for rigid conduit, fleible conduit or
cable systems as applicable.
Indicator Setting
1. Remove four screws and remove indicator cover. 4. Replace indicator cover and fasten with cover screws.
2. Lift up indicatorfrom the cover. Check to ensure that position indicator O-ring is properly
3. Set indicator on cover according to valve position. located in seal groove.


Instruction
- Use only wet cloth when clanning the indicator.
- Indicators are easily adjusted to match the dome' s clear windows or the special rotor angle indicator, such as 45°, 60° or
3 way indicator. Simply loosen the four screws to adjust the indicator. Make sure dome window line up with rotor
quadrants. Finally, tighten the screws to insure a good seal.
Inspection and Maintenance
Inspect the components of the limit switch box for wear or damage and replace where necessary.
Recommended Replacement Parts:
1.Limit switch 2. Position indicator O-ring 3. Housing O-ring 4. Shaft O-rings (top and bottom)

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