Water meters MJ-H
Multi Jet Hot Water Meter
A brass multi-jet meter for hot water below 90 °C, DN15 to DN50.
- Nominal size
- DN15 DN20 DN25 DN40 DN50
- Q3 permanent flow
- 1.5 m³/h 2.5 m³/h 3.5 m³/h 10 m³/h 15 m³/h
- Temperature class
- Below 90 °C Below 90 °C Below 90 °C Below 90 °C Below 90 °C
- Maximum working pressure
- 16 bar 16 bar 16 bar 16 bar 16 bar
Select nominal size (DN)
Specifications update with the selected size.
Overview
Why buyers choose it
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Rated below 90 °C
Built for hot-water service rather than a cold meter run past its rating.
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Sealed extra-dry dial
Hermetically sealed, so the register stays clear and readable on a hot line.
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Magnetic drive
No part of the register touches the water; the gearing stays out of the hot flow.
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Two strainers as standard
An inlet strainer and an internal one protect the jets and impeller from debris.
In detail
A multi-jet meter divides the incoming water into several jets spaced around its impeller, so the load on the impeller and its bearing is balanced and the meter holds its accuracy through years of stop-start use. This version is built for hot water: a brass body with threaded ends, rated for water below 90 °C at up to 16 bar, for residential, commercial and industrial hot-water lines.
It is made in five sizes from DN15 to DN50, with nominal flows from 1.5 to 15 m³/h. At DN15 it starts measuring at 30 L/h and reads to 0.0001 m³; the DN40 and DN50 sizes read to 0.001 m³.
The register is an extra-dry dial, hermetically sealed so that it cannot fog over the life of the meter, and driven magnetically so that no part of it is in contact with the water. Register and closure are in shock-resistant material, an inlet strainer and an internal strainer are both standard, and the spare parts are interchangeable for maintenance in service. A pulse output is available for remote reading.
The meter is declared to ISO 4064 in accuracy class B, the classification of the 1993 edition, with Qmin, Qt, Qn and Qmax flow points; it is not equivalent to class 1 or 2 of the current edition. The limits of error are ±5% from the minimum to the transitional flow and ±2% above it.
Technical specifications
Selected size: DN15 DN20 DN25 DN40 DN50
Values shown apply to the selected size. A dash means the figure is not stated.
Metrological
| Nominal size | DN15 DN20 DN25 DN40 DN50 |
|---|---|
| Accuracy class | Class B (ISO 4064:1993) |
| Register type | Multi jet, extra-dry dial, hermetically sealed, magnetically driven |
| Maximum permissible error, Q1 to Q2 | ±5% |
| Maximum permissible error, Q2 to Q4 | ±2% |
| Indicating range | 99,999.9999 m³ |
| Resolution of indicating device | 0.0001 m³ 0.0001 m³ 0.0001 m³ 0.001 m³ 0.001 m³ |
Hydraulic
| Q3 permanent flow | 1.5 m³/h 2.5 m³/h 3.5 m³/h 10 m³/h 15 m³/h |
|---|---|
| Q1 minimum flow | 0.03 m³/h 0.05 m³/h 0.07 m³/h 0.2 m³/h 0.3 m³/h |
| Maximum working pressure | 16 bar |
| Q2 transitional flow | 0.12 m³/h 0.2 m³/h 0.28 m³/h 0.8 m³/h 1.2 m³/h |
| Q4 overload flow | 3 m³/h 5 m³/h 7 m³/h 20 m³/h 30 m³/h |
Materials
| Body material | Brass |
|---|
Environmental
| Temperature class | Below 90 °C |
|---|
Approvals
| Standards | ISO 4064 |
|---|
Dimensions and installation
Length
165 mm
190 mm
260 mm
300 mm
330 mm
Height
104 mm
106 mm
120 mm
155 mm
155 mm
| Connection thread | G 3/4 B G 1 B G 1¼ B G 2 B G 2½ B |
|---|---|
| Length | 165 mm 190 mm 260 mm 300 mm 330 mm |
| Height | 104 mm 106 mm 120 mm 155 mm 155 mm |
| Width | 99 mm 99 mm 104 mm 125 mm 125 mm |
Parts
Parts of a multi-jet meter
How a meter of this type is built, and what this model is made of.
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Lid
Caps the register and keeps water and debris off the dial.
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Register
Totalises and displays the water passed.
Register type Multi jet, extra-dry dial, hermetically sealed, magnetically driven
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Register ring / seal
Seals the register housing against water ingress.
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Measuring chamber insert (with jets)
Directs several jets onto the impeller from multiple sides for balanced, even wear.
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Impeller
Turns with the combined jets and drives the register.
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Strainer
Screens out grit and debris before the measuring element.
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Body
Houses the measuring element and carries the flow.
Body material Brass
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Tailpieces / connections
Threaded couplings that join the meter to the pipework.
Connection thread G 3/4 B G 1 B G 1¼ B G 2 B G 2½ B
Download centre
Everything you need to specify.
Documents for the Multi Jet Hot Water Meter.
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Technical datasheet
Specifications and dimensions for DN15.
Specifications and dimensions for DN20.
Specifications and dimensions for DN25.
Specifications and dimensions for DN40.
Specifications and dimensions for DN50.
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Download PDF (Opens in a new tab)
All sizes datasheet
Every size in one sheet.
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Multi Jet Dry Dial Water Meter, Class B
- Sizes
- DN15–DN50
- Q3 permanent flow
- 1.5 m³/h at DN15