19 March 2007 -- Titan Enterprises is a UK based manufacturer of turbine, positive displacement and Pelton wheel flowmeters: unless otherwise specified all these flowmeters are calibrated on the in-house positive displacement oil or water flow rigs: these have an overall uncertainty of +/-0.25% (95% CL). The maximum flow rate available during calibration on water is 190 litres per minute and on oil 40 litres per minute (depending on viscosity). The flow rigs are checked annually against certified weigh scales that are traceable to national standards, and a new rig calibration certificate is issued each time.
The piston calibrators use a piston within a smooth bore tube to act as a moving barrier between the pressurising gas and the displaced test fluid.
It generates a continuous train of electrical pulses by use of a linear encoder/translator attached to the piston.
Each pulse represents an extremely small but very precise volume of fluid.
The unit is virtually immune to effects of the test fluid viscosity and density in accomplishing its volumetric flow determinations.
The calibrator consists of a precision honed flow tube, a flow piston and shaft, a photoelectric sensor (encoder), associated valves, supply tank, and an electronic console to interpret and display the data.
Air under pressure is introduced to the upstream side of the piston to provide fluid power for the calibration.
Downstream of the piston the system is flooded and fully bled.
The flow rate is controlled by the operation of the throttling valves.
As the piston moves down the flow tube, it dispenses fluid in a precise manner through the flowmeter under test, it also moves the photoelectric sensor past the etched glass rule.
The encoder produces an electrical pulse each time an etched line interrupts the light beam impinging on it.
The frequency of the continuous pulse train produced by the calibrator during a run is proportional to piston velocity and thus to the flow rate of fluid dispensed from the tube.
The total pulse count is directly proportional to the volume of fluid displaced by the piston, providing the signals against which the meter under test output is recorded.
Titan Enterprises can provide calibration certification and validation services, plus meter refurbishment and repair.
