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STS Prepaid Mechanical Water Meter XT815-M

The XT815-M is a cost-effective mechanical pulse prepaid water meter fully aligned with the IEC 62055 STS standard. It combines a mature mechanical metering structure with secure 20-digit TOKEN recharge, intelligent valve control and optional remote communication. The model is designed for residential properties, commercial buildings and large-scale retrofit projects that require dependable prepaid billing at a controlled project cost.

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ADVANTAGE

Key Features & Customer Benefits

Secure STS Prepayment: 20-digit encrypted TOKEN recharge helps protect transactions against unauthorized use and tampering.
Automatic Valve Control: Built-in motorized ball valve supports low-balance alerts, automatic shutoff and reopening after valid recharge.
Proven Mechanical Design: Mechanical impeller and pulse acquisition provide a mature, impact-resistant and economical metering solution.
Anti-Magnetic Protection: Strong magnetic interference can trigger an alarm and automatic valve closure to help prevent water theft.
Remote Management Ready: Optional 4G, LoRa or LoRaWAN supports remote reading, configuration and operational reporting.
Field-Ready Protection: IP68 sealing and a long-life lithium battery support demanding installation environments.

Technical Specifications

Parameter	Specification
Model	XT815-M mechanical pulse type
Metering method	Mechanical impeller + pulse acquisition
Nominal diameter	DN15 / DN20 / DN25
Permanent flow rate Q3	DN15: 2.5 m³/h · DN20: 4.0 m³/h · DN25: 6.3 m³/h
Turndown ratio	R100
Accuracy class	Class 2
Water volume unit	0.001 m³
Static current	≤ 20 μA
Temperature class	T30
Rated water pressure	1.6 MPa
Ingress protection	IP68
Installation orientation	Horizontal (H) or vertical (V)
Power supply	Long-life lithium battery; typical service life 6–10 years
Communication options	4G / LoRa / LoRaWAN
Prepayment protocol	STS (IEC 62055), 20-digit encrypted TOKEN

Core Functions

Forward water volume accumulation with local data retention for up to 10 years.
Real-time battery voltage monitoring and low-voltage warning.
Valve open/closed status detection, valve-stall diagnostics and anomaly reporting.
Remote manual or scheduled valve operation when the communication option is configured.
Automatic reporting of water consumption, fault status and recharge records.
Reverse-installation, unauthorized-disassembly, self-diagnostic and anomaly protection.

Typical Applications

Residential billing: Prepaid water management for apartments, communities and housing developments.

Bulk meter replacement: A practical solution for budget-sensitive utility retrofit and meter renewal programs.

Commercial properties: Credit-based water supply control for shops, offices, dormitories and rental properties.

Installation Requirements

Commissioning: Open the upstream valve slowly while venting through a downstream outlet. Confirm stable flow indication, normal accumulation and leak-free connections.

Flush the pipeline thoroughly before installation to remove silt, welding residue and other debris.
Install shutoff valves upstream and downstream; follow the flow-direction arrow on the meter body.
Standard straight-pipe condition: upstream ≥ 5DN and downstream ≥ 2DN.
Where an upstream elbow, tee or valve disturbs the flow: upstream ≥ 10DN.
Keep the meter horizontal or vertical as specified; do not install it at an angle.
Maintain at least 1 m from magnets, transformers and other strong magnetic-field sources.
Allow at least 30 cm of operating space for reading and maintenance.

Customer FAQ

How does prepaid recharge work?

The customer enters a secure 20-digit STS TOKEN. Once accepted, the credit is added and the valve can reopen automatically after a valid recharge.

What happens when the balance is exhausted?

The meter can issue a low-balance warning and automatically close the motorized valve when the available credit reaches the configured limit.

Can the XT815-M be read remotely?

Yes. Depending on the selected configuration, 4G, LoRa or LoRaWAN can be used for remote reading, parameter configuration and reporting.

What should be checked when a magnetic-interference alarm appears?

Remove the nearby magnetic source first, then restore the valve using the authorized error-clearing TOKEN according to the project procedure.

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