Oval NPI45 Series User Manual

Microswitches
＋
Potentiometer provided
Direct-reading type
Microswitch provided
or
Potentiometerv provided
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This manual has been prepared to provide you with the information pertinent to the VALVE POSITION
INDICATOR. With the proper application of the information and knowledge contained in this manual, you will
be able to expect the best possible results over a long service life of this instrument. Keep this manual at hand
for your quick reference.
OVAL VALVE POSITION INDICATOR
MODEL NPI 45
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Oval NPI45 Series Specifications

General

Brand	Oval
Model	NPI45 Series
Category	Touch Panel
Language	English

Summary

1. Before You Begin

Transportation and Storage Considerations

Guidelines for safe transportation and storage of the OVAL Valve Position Indicator.

2. Operating Conditions

3. General Product Information

Product Overview and Components

Details on the OVAL Valve Position Indicator's role, features, and identifiable parts.

Product Code and Specifications

Explanation of product coding and key technical specifications of the indicator.

Dial Scales and Remote Indication

Description of dial scales and the function of transmitters for remote valve position indication.

4. Configuration and Operating Principle

Internal Configuration and Working Principle

Visual representation of internal components and explanation of how the OVAL Valve Position Indicator operates.

5. Microswitch and Potentiometer Operation Diagrams

Operation Diagrams for Different Models

Illustrates microswitch and potentiometer operations for models with and without lock mechanisms.

6. Wiring Connections

Wiring Guidelines and Terminal Arrangement

Instructions for field wiring, transmission, interference prevention, and terminal layouts.

Terminal Connections Procedure

Step-by-step guide for connecting lead wires to the instrument's internal terminal block.

7. Operating Precautions

Air/Vapor Detection and Bleeding

Identifying symptoms of air/vapor and the procedure for air bleeding to ensure accuracy.

8. Maintenance and Troubleshooting

Troubleshooting Indicator and Gear Train Issues

Diagnosing and resolving issues like dead indicator, no pointer movement, or gear train failure.

Disassembly and Component Checks

Procedures for safe indicator removal and checking basic components like top cover and magnet assembly.

Pinion, Rotor, and Chamber Inspection

Inspecting components like pinion, Oval rotors, and measuring chamber for wear and condition.

Pointer, Microswitch, and Potentiometer Faults

Troubleshooting common faults related to pointer movement, microswitches, and potentiometers.

Periodic Servicing Recommendations

Guidance on regular disassembly, inspection, and replacement of seals.

9. Disassembly and Inspection

Basic Body (wetted parts) Disassembly

Detailed steps for disassembling the basic body and wetted parts of the indicator.

Magnetic Coupling Assembly Inspection

Procedure for disassembling and inspecting the magnetic coupling assembly.

Reduction Gear Train Inspection

Steps for separating and inspecting the reduction gear train unit.

9.4 Assembly Procedure

10. Microswitch, Potentiometer, Clutch Arrangements

Arrangements for Different Models

Diagrams illustrating the arrangements of microswitches, potentiometers, and friction clutches in various models.

11. Assembly Drawings and Parts Lists

Model NPI45B00 Drawing and Parts List

Detailed assembly drawing and parts list for the OVAL Valve Position Indicator Model NPI45B00.

Model NPI45B10 Drawing and Parts List

Detailed assembly drawing and parts list for the OVAL Valve Position Indicator Model NPI45B10.

Model NPI45B20 Drawing and Parts List

Detailed assembly drawing and parts list for the OVAL Valve Position Indicator Model NPI45B20.

Model NPI45B30 Drawing and Parts List

Detailed assembly drawing and parts list for the OVAL Valve Position Indicator Model NPI45B30.

12. Outline Dimensions