Because of the value and volume of product metered in any bulk plant or truck operation, errors are costly. For this reason, accuracy is the most important criteria in flowmeter selection. Neptune 1-1/4″ and 1-1/2″ Type 40 flowmeters provide the accuracy and convenience you need in measuring refined petroleum products and allow you to control cost, loss prevention and invoicing.
These rugged positive displacement flowmeters incorporate the Neptune refined fuel measuring chamber, which has only one moving part…the oscillating piston.
The New York City Transit Authority employs 1-1/2″ Type 40 Petroleum meters on dispenser stations for bulk refueling of city buses.
Features
- Outstanding long-term accuracy
- Reliable – the oscillating piston is the only moving part in the meter
- Easy Installation
- Fast and easy calibration positive change gear selection
- Low cost of maintenance and cleaning
- Ideal for loss control, loss prevention and invoicing
- Weights and Measures approved world wide
Literature
O&M Manual →
Tech Sheet →
Parts List →
Neptune 1-1/4″ and 1-1/2″ Type 4 compact flowmeters are superb instruments for small and medium capacity tank truck metering. These flowmeters are completely self contained for ease of installation. Manufactured from aluminum, these compact meters comprise a complete stand-alone petroleum batching system, saving space and weight.


Type S Flowmeters utilize the nutating disc principle of positive displacement measuring chamber technology. This design results in an accurate flowmeter that is insensitive to changes in viscosity and flow profile disturbances. The dual case measuring chamber design means particle matter and high fluid pressure do not influence accuracy.
The Neptune Type S Nutating Disc High Pressure (HP) Flowmeters are precision-constructed measuring instruments used for accurate measurement of liquids at high pressures. The dual case measuring chamber design means accuracy does not change with increased fluid pressures.
The 2″ Type S Magnetic Drive flowmeter, with double case construction, utilizes the nutating disc positive displacement technology. This design results in an accurate meter, which is insensitive to small changes in viscosity and flow profile disturbances. The magnetic drive feature eliminates the use of a drive shaft stuffing box eliminating a leak path. This enables measurement of difficult fluids such as salt brine and sugar, which tend to crystallize. The Type S Magnetic Drive is an ideal selection for continuous operation because they substantially reduce leaks and measuring element clogging. Further, the external gear train and register may be serviced without flow interruption.

The Type MP Oscillating Piston Flowmeter provides high accuracy industrial liquids flow measurement. The Type MP Oscillating Piston Flowmeter provides high accuracy industrial liquids flow measurement. Neptune’s MP Series of Flowmeters has proven reliable through years of measuring over 400 common industrial liquids.
