High Precision STS Prepaid Water Meter - Durable Prepayment Water Meter for

Product Specification

The STW36 STS keypad-type prepaid water meter supports DN15/DN20/DN25 pipe diameters. It features IP68 waterproofing, achieved with an epoxy- sealed circuit board and an inter- case sealing ring. There is a replaceable ER18505 high- capacity lithium battery, and when paired with low- power technology, it offers a battery life of 4–6 years. By integrating an optional LoRa RF module and a concentrator, a remote monitoring system can be established, making it an ideal choice for efficient water resource management in residential and commercial environments. The product is manufactured in strict compliance with ISO9001 and ISO14001 certifications, meeting the highest industry standards to guarantee reliability and long-term durability.

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1. Basic Configuration & Compatibility: Supports pipe diameters DN15/DN20/DN25; adopts multi-jet dry dial design with Class B/Class C accuracy (Class 2.0 for all sizes) and brass threaded connections (G3/4B for DN15, G1B for DN20, G1-1/4B for DN25).
2. Durability & Protection: Features IP68 waterproof rating (epoxy-sealed circuit board + inter-case sealing ring), flame-retardant ABS thick-walled housing, and corrosion-resistant brass main body, suitable for harsh, humid environments.
3. Power Supply: Equipped with a replaceable 3.6V ER18505 lithium battery (4000mAh) and low-power technology, ensuring 4–6 years of service life; includes low-battery alert and auto-valve lock with data backup.
4. Display & Operation: Equipped with LCD display (digital + pointer) for real-time reading, balance, and alerts; user-friendly keypad design, detachable battery compartment, and transparent meter cover for easy monitoring.
5. Core Functions:
   • Tamper detection: Automatically closes valve upon magnetic interference; requires tamper token for restoration.
   • Event logging: Stores 10-year consumption data (monthly/hourly) and tamper/valve events, queryable via short codes.
   • Credit management: Triggers low-credit alert (configurable via token) and supports emergency overdraft with flexible repayment.
   • Multi-tariff support: Configurable tiered pricing (up to 3 tariff steps) authorized by token.
   • Recharge limitation: Rejects over-recharge when total credit exceeds preset limit.
   • High-precision real-time clock: Ensures accurate timestamps for events and scheduled functions.

1. Communication & Remote Monitoring: Optional 433MHz LoRa-RF module, enabling 350m (with CIU) / 900m (with DCU) communication distance; integrable with concentrators for remote monitoring systems.
2. Certifications & Standards: Complies with ISO9001, ISO14001, and GB/T778-2018 standards, ensuring reliability and long-term durability.
3. Dimensions: DN15 (165×94.5×113.8mm), DN20 (195×94.5×113.8mm), DN25 (225×94.5×113.8mm) (length×width×height).
4. Technical Performance: Maximum reading 99999.9m³; nominal working pressure 10Bar/1MPa (max 16Bar/1.6MPa, min 0.2Bar/0.02MPa); pressure loss <0.6Bar/0.06MPa;
5. working temperature <50℃ (cold water use); permissible error ±5% (Q1≤Q≤Q2) and ±2% (Q2≤Q<Q4).