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1. What is the difference between single jet and multi jet?

Single jet meters are a low cost option where there is a direct impact to the impeller from the flow of water. On a multi jet meter there are several points at which the water rotates the impeller. This gives a much longer life and retains accuracy as the load is evenly placed across the impeller. It is always recommended to use a multi jet meter rather than a single jet meter if possible.

 

2. What is a Woltmann meter?

Sometimes known as a Helix drive meter, these are used for larger sizes of 2" and upwards. The name Woltmann is believed to be from the German Engineer who first developed this principle in the 1790's.

 

3. Can the meters be mounted vertically?

This is not recommended as it causes excessive wear and reduces the accuracy. The dry dial meters are magnetically coupled and when mounted vertically this can separate the magnets so that the meter doesn't function. When mounted vertically, the meters will drop an accuracy class. If you must have vertically mounted meters, then please contact us for a solution.

 

4. How do I fit a water meter?

Look at our data sheet here.


Download the PDF

5. What is pulsed and non pulsed?

A pulsed meter has a cable attached which will give a pulse signal at a pre-set value, eg, 1, 10,100 or 1000 litres of flow to a remote pulse counter allowing the meter to be read remotely via a pulse counter or Building Management System (BMS). We can provide remote reading digital displays if the meter is in a difficult to access location. This will show the water consumption in litres/m3.

A non pulsed meter has no wire and cannot be retro fitted with one.

 

6. What is the wire for?

See the above. If the customer doesn't need the wire because they want a 'read only' meter, either remove it or tie it back. It has no bearing upon how the water meter works whatsoever. The multi jet and Woltmann range have the wire fitted as most customers want this facility and the extra cost of the wire is negligible.

 

7. What does Class A, B, C and D refer to?

These are the ISO classifications to water meters and refer to the ability of the meter to measure low flows. Class A having the least ability to do this, Class D having the most. Most European nations use Class B meters. This includes Italy, Greece, Spain and Scandanavian nations. Eastern European nation normally use Class B meters too. Additionally, Class B meters tend to hold there accuracy Class for longer than Class C types. Class C and D are normally positive displacement meters which need extremely good quality water to avoid issues.

 

8. What is secondary (sub metering) metering?

This is where there is the wish to sub meter, for example a landlord in a block of flats. There may be one meter on the incoming main water, but there is a need to sub meter for tenants at each individual premise.

 

9. How do I size a water meter?

By flow rate, not line size. Typically, the flow rate should fall between Qt (transitional flow rate) and the Qn (nominal flow rate.) Sizing the meter by line size alone means that there is a risk that it may not function correctly (or at all) due to either excessive or inadequate flow.

 

10. Can you provide an 'own brand' meter?

Yes we can, subject to production volumes making it viable. We have done this successfully for many years.

 

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