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Summary of Contents for DeZurik P41
- Page 1 DEZURIK MODELS P41, P41D AND P42 PMV POSITIONERS D10112 Instruction August 2012 DeZURIK, Inc. Sartell, Minnesota USA | Phone: 320-259-2000 | www.dezurik.com | info@dezurik.com...
- Page 2 DeZURIK Instructions These instructions provide information about Models P41, P41D and P42 PMV Positioners. They are for use by personnel who are responsible for installation, operation and maintenance of Models P41, P41D and P42 PMV Positioners Safety Messages All safety messages in the instructions are flagged with an exclamation symbol and the word Caution, Warning or Danger.
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Page 3: Table Of Contents
DeZURIK Table of Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -... -
Page 4: Description
DeZURIK Description The Model P41, P41D and P42 PMV Electro-Pneumatic positioner is a precision instrument which, when used in conjunction with a cylinder actuator, can provide the exacting control necessary to satisfy the most demanding process requirements. The positioner will accept either a 0–20mA or 4–20mA input signal. -
Page 5: Maintenance
DeZURIK Maintenance Cleaning Positioner Body To ensure proper positioner operation, it is necessary to periodically clean the positioner valve body and the restriction plug according to the following steps. 1. Close the valve.. Failure to close the valve may result in the valve slamming shut while the positioner is being cleaned.. -
Page 6: Cleaning The Restriction Plug
Note: Do not enlarge the restriction hole. 3. Inspect the O-rings, then install the restriction plug. 4. Install an in-line air filter in the positioner supply port. Note: Contact the DeZURIK Parts Department to order the filter. Figure 2 – Restriction Plug Location Adjustments These instructions are written for a unit that is piped to Open the valve on an increasing signal. -
Page 7: Zero Adjustment
DeZURIK Adjustments (continued) 3. Adjust the length of the rod until the valve is in the position corresponding to the minimum input signal. Zero Adjustment 1. Set the positioner input signal at the minimum value of its range, for example, 4mA for a 4- 20mA range. -
Page 8: Gain Adjustment
DeZURIK Adjustments (continued) Gain Adjustment The gain adjustment is preset at the factory to match Table A: Gain Spring Position your actuator under average conditions. Table A lists Settings the factory presets. Actuator Spring Position If it is necessary to adjust the gain,... -
Page 9: Reversing Valve Action
DeZURIK Reversing Valve Action Figure 3 – Cam Position To change from having the valve Open, to having it Close, on an increasing signal, follow the steps below: 1. Close the valve. (Failure to close the valve may result in the valve slamming shut.) 2. -
Page 10: Troubleshooting
DeZURIK Troubleshooting Condition Possible Cause Corrective Action No supply air pressure. Check for correct air supply. Check markings on terminal Signal wires connected wrong. block. Broken wire between positioner Check continuity of wiring, and Signal change has no effect on terminal block and printed circuit check for tight connections. - Page 11 If you use metric fasteners with ASME Class 150/300 bolt holes and flange bolt patterns, you do so at your sole risk and any liability associated with such use shall not be the responsibility of DeZURIK, Inc. In addition to the foregoing, DeZURIK’s Manufacturer’s Conditions apply.
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