STS Ultrasonic Prepaid Water Meter XT815-U
Static ultrasonic measurement inside an STS prepayment meter — no moving parts to wear, no accuracy drift to argue about.
Product overview
The XT815-U pairs the same STS prepayment logic as the XT815-M with an ultrasonic measuring tube. Because there is no impeller, no gear train and no mechanical wear, the meter keeps its accuracy over a long service life instead of slowly under-registering as a mechanical meter does.
It is aimed at projects where the utility wants prepayment and metering accuracy at the same time: high-rise residential blocks with zoned metering, student dormitories, and commercial complexes where the landlord bills tenants on measured consumption.
Key benefits
Practical advantages for distributors, contractors and project buyers selecting a water meter for daily metering work.
No moving parts
Ultrasonic measurement has no mechanical wear, so accuracy stays where it was set instead of drifting down
What it means for youNo accuracy decay to argue about in year six, and no mass replacement driven by worn elements.
Catches what mechanical meters miss
A low starting flow registers trickling taps and slow night leakage
What it means for youWater you already produce and deliver gets billed — the gap between production and billed volume closes.
One meter covers the whole apartment range
Accurate at both low and high flow, so the whole household band is covered by one model
What it means for youNo oversizing to catch peaks, no second specification, and one spare type to hold.
Prepayment built in
STS 20-digit token recharge and automated valve control are in the meter
What it means for youOne device to buy, install and support instead of a meter plus a prepayment add-on.
Built for multi-unit buildings
Zoned metering for high-rise residential and commercial blocks with per-unit billing
What it means for youPer-unit billing without a meter reader walking the block every month.
Fewer site visits
Remote reading plus automated valve control removes routine door-to-door work
What it means for youRoutine reading and disconnection visits come off the operating budget instead of growing with the fleet.
Technical specifications
Check the product parameters used for model selection, quotation review and project documentation.
| Parameter | Value |
|---|---|
| Model | XT815-U ultrasonic type |
| Metering principle | Ultrasonic transit-time, static (no moving parts) |
| Nominal sizes | DN15 / DN20 / DN25 |
| Permanent flow rate Q3 | DN15: 2.5 · DN20: 4.0 · DN25: 6.3 m³/h |
| Turndown ratio | R250 |
| Accuracy class | Class 2 |
| Prepayment protocol | STS (IEC 62055), 20-digit encrypted token |
| Valve | Built-in motorised ball valve |
| Battery | Long-life lithium battery, 6–10 years service |
| Communication | M-BUS, RS-485, 4G, LoRa / LoRaWAN (options) |
| Rated water pressure | 1.6 MPa |
| Temperature class | T30 (0.1–30°C cold water) |
| Ingress protection | IP68 |
| Installation orientation | Horizontal or vertical |
| Applicable standard | GB/T 778.1-5-2018; JJG 162-2019; CJ/T 434-2013 |
Materials and dimensions
Review the main component materials and dimensions before confirming water conditions, installation space and packaging requirements.
| Component | Material |
|---|---|
| Valve | Built-in ball valve that closes on arrears or fault |
| Display | LCD, sealed |
Where this model is installed
Where this model is already doing the job. Each application page carries the parameters buyers check before they specify.
Applications
Where this model is specified, and who is usually the buyer.
High-rise residential zoned metering
One static meter per floor or per riser, billed through the prepayment platform.
Typical buyer: Property manager, developerCommercial complex sub-metering
Tenants billed on measured consumption with pre-payment control over each unit.
Typical buyer: Building operatorDormitory and staff housing
Per-room prepayment with no mechanical wear from intermittent use.
Typical buyer: University, factory HR housingProduct FAQ
Answers to common questions about product selection, options and quotation.
How is this different from a mechanical prepaid meter?
Does it still use STS tokens?
Get a quote for STS Ultrasonic Prepaid Water Meter XT815-U
Tell us the sizes and quantities you need and we will come back with pricing, lead time and the data sheet.
- Factory-direct pricing with no trading company in between
- OEM branding, dial customisation and private labelling available
- Samples available for evaluation before a full order
- Technical support on sizing, installation and system integration
Prefer to talk to us directly?
- Tel: +86 15615396327
- Email: jiang@sd-chenshuo.com