Litre Meter manufacture and distribute an enviable range of flowmeters. From the low flow robustness of the VFF positive displacement meter to the precision of the Tricor Coriolis range, Litre Meter have a solution to your tricky measurement application. Call our engineers now to receive the best advice on meter selection and application.
LM & MM Pelton Wheel
The LMX series, pictured, was designed from the outset to meet two simple parameters: a pressure rating of 100 bar coupled with a temperature rating of 100°C. End couplings are either ½”NPT or BSP with built-in straight lengths of pipe. As a bonus, the minimum fluid temperature can be -50°C and there are just 3 wetted materials. With 316 stainless steel, PTFE and sapphire in contact with the fluid there are few applications that it can’t handle. Flow rate abilities are selected by different internal jets enabling the same size body to measure from 0.004 l/min up to 65 l/min in just a few sizes.
Applications are numerous. The Pelton Wheel was originally developed with petrol and water in mind. These are both low viscosity fluids and are measured regularly, often at low flow rates. The smallest range (LM003) is designed to measure from 4 millilitres per minute up to 60 ml/min. As the jet size increases the rangeability also increases. The LM05, for example, 0.02 to 1.3 l/min and the LM220 is a magnificent 0.1 to 28 l/min.
These wide ranges can be attributed to 3 significant design factors:
- Wide bladed pelton wheel design for maximum impulse
- Sapphire bearings for minimal friction
- A no-drag sensor to enable lowest flows
With over 46 years’ experience in these meters we have optimised the bearing and sensor design for long life and high efficiency with remarkable linearity.
For flows above 28 l/min the body size is increased but the basic principles are the same. The materials in contact are limited; the rotor and sensor are identical and a wide flow range is still offered. The meter is very compact with the largest sizes fitting between flanges just 57mm apart.
All of the flow ranges can be achieved with plastic bodied meters rather than stainless steel and ultimately, with no metal parts in contact with the fluid. PVC is the standard plastic which has excellent chemical compatibility, but other plastics are possible including polypropylene and PFA.