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Oval 50 - User Manual

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1
Ins. No.
B-149-4N-E
Meter Sizes 50, 52, 53, 55, 56, and 57
High Temp./Low Temp. Service and Jacketed
SMART ULTRA OVAL FLOWMETERS
Every SMART ULTRA OVAL is fabricated and shipped from our factory under stringent quality control. In
order to maintain its design performance throughout the life of the meter, this manual offers the operator the
necessary installation, operation and maintenance information.
Be well familiar with these instructions before you place the meter in service and keep this manual at the eld
location for ready reference.
The standard, high temperature-service, low temperature-service, and jacketed type meters all have in
common the same specifications described in this instruction manual except for some differences in the
jacketed type on its piping procedure and operating precautions. Be careful to observe the instructions given
with a reminder "See also page 15 for the jacketed type".
◆
About Meter Size Designation
◆
The size of OVAL positive-displacement owmeters is basically identied by a two-digit code. For complete
details, see Section 17 PRODUCT CODE EXPLANATION.
Meter size 50
Cooling tube provided
Meter size 57
Cooling tube provided
Meter sizes 52, 53, 55, 56
Heating tube provided

Table of Contents

Questions and Answers

  • J
    Joseph FranklinJul 28, 2025
    Why is the accumulated total too high on my Oval Measuring Instruments?
    • S
      Sandra MilesJul 28, 2025
      If the accumulated total on your Oval Measuring Instruments is too high, it might be due to rotors rocking because of pulsating flow. Try adding a check valve and accumulator. It could also be that external magnetic fields are influencing the meter sensor. Ensure you keep out external magnetic fields. Air entrapment can also cause this issue; providing an air vent may resolve it.
  • E
    Emily KennedyAug 1, 2025
    What to do if my Oval Measuring Instruments counts while valves remain closed?
    • A
      amybauerAug 1, 2025
      If your Oval Measuring Instruments counts even when the valves are closed, inspect the valves and pipeline for leaks. Air pockets between the valve and the device can also cause this; vent the air and provide a check valve and accumulator. Also, eliminate any voltage fluctuation in the supply power.
  • C
    clarkbrianAug 6, 2025
    Why is my Oval Measuring Instruments leaking liquid?
    • W
      washingtoncherylAug 6, 2025
      If you notice liquid leaks in your Oval Measuring Instruments, first, retighten the bolts at the pipeline connections or replace the gaskets with new ones to ensure a complete seal of the pipeline. Also, inspect the front and rear cover fitting bolts for tightness and replace the O-rings with new ones if there's an incomplete seal on the meter body's front or rear cover.
  • E
    Elizabeth MoraAug 11, 2025
    Why are my Oval Measuring Instruments making unusual noise?
    • S
      Scott ClarkAug 11, 2025
      If your Oval Measuring Instruments are making unusual noises, it could be due to air being entrapped in the system. Reduce the flow rate and completely eliminate air in the piping assembly. Alternatively, the metered liquid might be vaporizing in the piping assembly. Reduce the flow rate and control the metered fluid temperature and pressure to prevent vaporization.
  • L
    Leslie ChristianAug 16, 2025
    How to fix an inoperative totalizer on Oval Measuring Instruments?
    • M
      martinezgraceAug 16, 2025
      The totalizer on your Oval Measuring Instruments may remain inoperative due to several reasons. The flow rate might be too low; open the valves progressively to increase it. Insufficient pump pressure or head pressure could also be the cause; correct the pump pressure or head pressure, considering the pressure loss of the entire piping assembly. Ensure the power line voltage is within specification, providing a 14 to 45VDC power to the register. If the rotors are jammed, they need to be cleaned thoroughly. Ensure that the rotors and sensor are installed correctly.
  • P
    Peter ReedAug 21, 2025
    What to do if accumulated total influenced by external magnetic fields in Oval Measuring Instruments?
    • C
      coxbrianAug 21, 2025
      If the accumulated total is influenced by external magnetic fields, keep out external magnetic fields.

Summary

Before You Begin

Operating Conditions

LCD Counter Display

Total Counter Reset

Installation

Key Installation Considerations

Key factors for proper installation, including flushing, pipe strains, and magnetic fields.

How to Change Flow Directions

Wiring Instructions

Field Wiring Guidelines

Recommendations for field wiring, transmission length, and interference prevention.

Terminal Connections and Grounding

Details on connecting wires to the terminal block and grounding the unit.

Signal Output Hookup

Explains signal transmission for pulse and analog outputs and load resistance.

Operating Instructions

Initial Operation Procedure

Step-by-step procedure for initial operation and break-in period.

General Operating Precautions

Important advice on handling rapid flow/temperature changes and exceeding limits.

Operation Shutdown Precautions

Guidelines for safe shutdown procedures, including valve closure and fluid removal.

Jacketed Meter Piping and Operation

Specific piping and operation guidelines for steam and hot-water jacketed meters.

Disassembly and Inspection

Size 50 Disassembly and Inspection

Detailed steps for taking apart and inspecting the Size 50 meter body.

Size 50 Assembly Procedure

Sizes 52-57 Disassembly and Inspection

Sizes 52-57 Assembly Procedure

Register Switch Functions and Parameter Setting

Register Switch Names and Functions

Test Pin Functions

Determining a New Meter Factor

Sensor Replacement Procedure

Troubleshooting

General Specifications

Product Code Explanation

Additional Code Details

Oval 50 Specifications

General IconGeneral
MaterialStainless Steel
Output SignalPulse, 4-20mA
Measurement Range0.5 - 50 m/s
DisplayLCD
Power Supply24 VDC

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