Application and Selection Criteria
The Oilgear PV Meter may be used with fluids having 130 Centistokes viscosity or less without significant change in accuracy. As with all velocity inference meters, the PV Meter accuracy will change with high viscosity fluids; however, the change will be less than typical turbine meters. Since the PV Meter's unique cage chamber construction requires less cutting of the flow stream, viscosity has less effect. Regardless of viscosity, the PV Meter will be repeatable within 0.25%. Consult the factory for application guidelines with higher viscosity fluids.
PV Meters are volumetric measuring devices and, as such, will measure the volume of any and all materials passed through the meter. This includes entrained air, liquid vapors, and entrapped gases. This should be remembered in designing systems since vapor elimination may be required. Volatile fluids, such as LPG and liquid anhydrous ammonia, must be pressurized by pump or sufficient gravity head to prevent vaporizing or "flashing" within the meter. Pressure of the liquid should be increased above that of the supply tank (or wherever vapor and liquid are in equilibrium) so there is a definite excess over tank pressure at the meter outlet. A flow control valve downstream from the meter is recommended.
Using the meter below minimum specified flow rate will result in erroneous readings.
Consistently using the meter to 130% of maximum flow rate will not cause erroneous readings but may result in lowering the potential wear life of the meter and readout.
Up to 130% of maximum flow rate at less than 20% of the duty cycle will provide satisfactory results with minimal effect on life.
200% to 300% and more may not cause damage depending on how often and how much. Certifications Available
Flow meter selection requires consideration of many factors including the anticipated flow range, pressure, corrosion resistance, entrained particles, fluid characteristics, etc. Here you will find a full range of applications that use our PV Flow Meters and the different types of fluids that can be used.
The Oilgear Company is committed to providing the best customer service possible. If you have any questions, concerns, comments, or need to get in touch with our Customer Service or Engineering staff, please send us a message, and we will contact you to address your concerns.
A well-trained workforce is the best way to keep equipment running at peak performance. Oilgear's full complement of training programs ensures our customers have up-to-date information. Training sessions, standard or custom, can be held on-site or at Oilgear's training facility. We also offer system documentation packages.