Description

Available in a wide variety of body sizes and styles, all NT flow meters possess an electrical pulse output directly proportional to flow rate. Remote flow rate indication, alarms, totalising and batch control functions are available utilising our wide range of secondary electronic instruments.

The flow meters are suitable for use on lubricating or non-lubricating liquids of low to medium viscosity and are largely insensitive to density variations, pressure or temperature fluctuations.

Contact parts are produced from 316 stainless steel,except rotors which must possess good magnetic qualities, and here 431 stainless is used or Ferralium alloy depending upon the corrosive properties of the liquid.

Standard end connections are screwed BSP parallel thread with included 30 degree internal cones to BS5200, but Ermeto threads are also available. Flanged meters are normally to ANSI 150 orBS4504 (DIN) standards, but older type flanges to BS10 tables D-H may also be fitted.

The electrical signal is a sinusoidal pulse of minimum height 50mV peak at lowest flow rate, rising to 800mV peak at max flowrate. For normal transmission distances pre-amplifiers are not essential since pulse shaping and conditioning are carried out in the appropriate electronic readout unit. In cases where heavy electrical noise is present or where transmission distances are over 500 metres, pre-amplifiers of standard or intrinsically safe design are available as head mounted weatherproof units and loop powered.

NT Technical DataSubsea Turbine Flow Meter

 

Linear Accuracy: <0.5% over 10:1 Range
Repeatibility: <±0.1% of Reading
Response Time: <50 millisecs for 50% step change in flow rate
Output Signal: Sinusoidal pulses 50mV-800mV peak
Operating Pressure: Twice the pressure drop across the meter
Pressure Drop: 0.2-0.5 Bar depending on meter size
Flow Range: 10:1 as standard
Temperature: -30°C min, 150°C max (standard coils)
400°C special design & 120°C Intrinsically Safe
Transmission Distance: 500m max