This document describes the OVAL Flowpet-NX, a positive displacement flowmeter designed for oil service, equipped with a mechanical register. It offers precise flow measurement and is built for durability and ease of use.
Function Description
The Flowpet-NX is a direct-readout type counter specifically designed for accurate flow measurement of oil. It utilizes the principle of an Oval positive displacement meter to ensure high precision. The device can be equipped with a pulse generator, allowing it to output signals for flowrate information. This enables integration with remotely located receiving instruments for control, regulation, or recording processes. The mechanical register provides a clear and legible display of accumulated flow.
Important Technical Specifications
General Specifications:
- Application: Oil service
- Accuracy: Within ±0.5%
- Operating Temperature Range: 0 to +120°C
- Max. Operating Pressure: 1.18 MPa (12 kgf/cm²)
- Flange Rating: JIS 10K RF
- Materials:
- Meter Body: FC250
- Rotors: Special resin
- Color Finish (Meter Body): Munsell 2.5YR6/13
Flow Range (L/h):
| Size |
Nominal Dia. (mm) |
Kerosene (0.8 ~ 2 mPa·s) |
Light Oil (A Heavy Oil) (2 ~ 5 mPa·s) |
Heavy Oil (5 ~ 200 mPa·s) |
| 50 |
20 |
150 ~ 1600 |
80 ~ 2000 |
50 ~ 2000 |
| 52 |
25 |
300 ~ 3000 |
150 ~ 3800 |
80 ~ 3800 |
| 53 |
40 |
600 ~ 5000 |
300 ~ 6400 |
150 ~ 6400 |
| 55 |
40 |
1200 ~ 11000 |
600 ~ 14000 |
400 ~ 14000 |
| 56 |
50 |
2000 ~ 20000 |
1400 ~ 24000 |
900 ~ 24000 |
Mechanical Register:
- Function: Cumulative total counter with a dial-pointer and number drums
- Models: LS5076, LS5276 (1L per pointer revolution) and LS5376, LS5576, LS5676 (10L per pointer revolution)
- Resolution: 0.01L (for 1L/rev models) or 0.1L (for 10L/rev models)
- Counter Capacity: 999,999.99L (for 1L/rev models) or 9,999,999.9L (for 10L/rev models)
- Operating Temp. Range: -10 to +60°C
- Construction: Waterproof conforming to IP65 (weathertight)
- Materials: Resin/aluminum die casting
- Finish (housing): Munsell 4.9PB40/13.9 (color of molding)
Pulse Output (Mechanical Register):
| Product No. |
Nominal Bore Size (mm) |
Pulse Unit (L/P) |
Output Freq. at Max. Rate (Hz) |
Max. Flow Rate (L/h) |
| LS5076-2☐☐A |
20 |
0.1 |
5.5 |
2000 |
| LS5276-2☐☐A |
25 |
0.1 |
10.5 |
3800 |
| LS5376-2☐☐A |
40 |
1 |
1.8 |
6400 |
| LS5576-2☐☐A |
40 |
1 |
3.8 |
14000 |
| LS5676-2☐☐A |
50 |
1 |
6.7 |
24000 |
Factored Pulse Generator (Option) in Mechanical Register:
- Output Pulse Type: Voltage pulse, Open collector, Contact-closure pulse
- Number of Pulse (per pointer rev.): 10P (Voltage/Open Collector), 1P (Contact-closure)
- Pulse Width: 1ms min. (Voltage/Open Collector)
- Duty Factor: 40/60 to 60/40 (Contact-closure)
- Output Signal Levels: ON: 6.5V min., OFF: 1V max. (Voltage pulse); ON: 1V max. (Open collector)
- Max. Operating Current: 30mA (Voltage/Open Collector), 60mA (200Ω protective resistor provided) (Contact-closure)
- Max. Operating Voltage: 40VDC (Open Collector), 125VAC, 5VDC (Contact-closure)
- Contact Bounce: 0.5ms max. (Contact-closure)
- Life: 5 x 10⁷ cycles of operation (with resistive load at 12VDC, 10mA) (Contact-closure)
- Signal Cable: Vinyl-insulated, 4-conductor, shielded (individual element 0.5mm², 7mm in O.D.)
- Transmission Length: 1 kilometer max. (using CVVS cable 1.25 to 2.0mm²)
- Power: 12 to 24VDC ± 10% (Voltage/Open Collector)
- Current Drain: 20mA max. (Voltage/Open Collector)
Strainer Specifications:
- Operating Temp. Range: 0 to +120°C
- Max. Operating Pressure: 1.18 MPa (12 kgf/cm²)
- Body Materials: FC250
- Net Materials: SUS304
- Finish: Munsell 2.5YR6/13
Usage Features
- Installation Flexibility: The Flowpet-NX can be installed in both horizontal and vertical piping configurations. For vertical lines, it is recommended to install it on the bypass side to prevent scales from falling from the top of the piping assembly.
- Adjustable Flow Direction: The flow direction can be easily changed from right-to-left to left-to-right, or top-to-bottom to bottom-to-top, by rotating the register 180 degrees and re-installing the meter body.
- Strainer Integration: A strainer is recommended upstream of the meter to prevent foreign matter from entering and damaging the measuring chamber.
- Warm-up Procedure: For high-temperature liquids (exceeding 80°C), a warm-up period of at least 10 minutes is recommended to ensure uniform temperature distribution in the measuring chamber.
- Careful Valve Operation: During initial piping and operation, careful valve manipulation is crucial to prevent violent spinning of the rotors by compressed air, which could damage the meter.
- Lagging Work: For cold regions or when metering solidifying materials, lagging work for the flowmeter and strainer is recommended, but the register and pulse generator must not be lagged.
Maintenance Features
- Easy Disassembly for Inspection: The design allows for relatively straightforward disassembly of the meter body and register for inspection and cleaning.
- Strainer Cleaning: The strainer net should be inspected and cleaned regularly. For newly installed piping, daily inspection is recommended initially, gradually decreasing the frequency based on observations.
- O-ring Replacement: In case of liquid leaks, O-rings on the meter body cover can be replaced.
- Troubleshooting Guide: The manual provides a troubleshooting section to address common issues such as fluid not flowing, liquid leaks, and the register failing to count, offering possible causes and countermeasures.
- Service Support: For issues not covered in the manual, users are advised to contact OVAL service, providing product name, model number, and detailed symptoms.
- Component Identification: Exploded views and service parts lists are provided to aid in identifying and ordering replacement parts.
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