Water meters SJ-C
Single Jet Liquid Sealed Water Meter
A class C single-jet meter that registers from 15 litres an hour.
- Nominal size
- DN15 DN20
- Q3 permanent flow
- 1.5 m³/h 2.5 m³/h
- Accuracy class
- Class C (ISO 4064:1993) Class C (ISO 4064:1993)
- Maximum working pressure
- 16 bar 16 bar
Overview
Why buyers choose it
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Half the starting flow
15 litres an hour at DN15 against the class B meter's 30, so less passes before counting begins.
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Where the losses actually are
A weeping cistern runs below a class B meter's threshold all night, every night, and never appears on a bill.
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Liquid sealed register
The number wheels stay legible, which is what stops a meter being estimated instead of read.
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Same body, better class
It fits where the class B meter fits, so improving a scheme's accuracy is not a pipework job.
In detail
This is the accuracy class C meter in the single-jet range, and the class is the whole point of it. At DN15 it registers from 15 litres an hour where the class B meter in the same body starts at 30 — so half as much water passes unmeasured before the meter begins to count.
On a single house that difference is small. Across a society of two hundred flats, each with a cistern valve that weeps, it is the difference between a bulk meter that reconciles against the sum of the sub-meters and one that does not. Unaccounted-for water is mostly not theft; it is thousands of hours of flow below the starting threshold of the meters that were installed.
The register is liquid sealed, which keeps the wheels legible, and the meter covers DN15 and DN20 with nominal flows of 1.5 and 2.5 m³/h.
Technical specifications
Selected size: DN15 DN20
Values shown apply to the selected size. A dash means the figure is not stated.
Metrological
| Nominal size | DN15 DN20 |
|---|---|
| Accuracy class | Class C (ISO 4064:1993) |
| Register type | Single jet, semi-liquid sealed dial |
| Maximum permissible error, Q1 to Q2 | ±5% |
| Maximum permissible error, Q2 to Q4 | ±2% (hot-water version ±3%) |
Hydraulic
| Q3 permanent flow | 1.5 m³/h 2.5 m³/h |
|---|---|
| Q1 minimum flow | 0.015 m³/h 0.025 m³/h |
| Maximum working pressure | 16 bar |
| Q2 transitional flow | 0.0225 m³/h 0.0375 m³/h |
| Q4 overload flow | 3 m³/h 5 m³/h |
Materials
| Body material | Brass, painted or nickel coated |
|---|
Environmental
| Temperature class | ≤30 °C (hot-water version ≤90 °C) |
|---|
Approvals
| Standards | ISO 4064:1993 |
|---|
Dimensions and installation
Length
110 mm
130 mm
Height
85 mm
| Connection thread | G3/4" B G1" B |
|---|---|
| Length | 110 mm 130 mm |
| Height | 85 mm |
| Width | 78 mm |
Parts
Parts of a single-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 Single jet, semi-liquid sealed dial
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Register seal
Seals the register housing against water ingress.
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Measuring chamber
Directs the single tangential jet onto the impeller.
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Impeller
Turns with the jet of water 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, painted or nickel coated
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Tailpieces / connections
Threaded couplings that join the meter to the pipework.
Connection thread G3/4" B G1" B
Download centre
Everything you need to specify.
Documents for the Single Jet Liquid Sealed Water Meter.
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Download PDF (Opens in a new tab) Download PDF (Opens in a new tab)
Technical datasheet
Specifications and dimensions for DN15.
Specifications and dimensions for DN20.
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Download PDF (Opens in a new tab)
All sizes datasheet
Every size in one sheet.
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- Sizes
- DN15–DN50
- Q3 permanent flow
- 1.5 m³/h at DN15