The STS Prepaid Water Meter from Shengda Water Meter Co., Ltd. is a secure and reliable prepaid water metering solution based on the global Standard Transfer Specification (STS). Using encrypted 20-digit numeric tokens, the meter ensures accurate credit delivery, tamper-proof operation, and full control of water consumption for utilities and property management companies.STS meters are widely used in Africa, Southeast Asia, and regions where prepaid systems are required for revenue protection and efficient water supply management.
Key Features
1. STS 20-Digit Token Technology
20-digit encrypted numeric token input via:
Keypad (on meter or CIU)
User Interface Unit (CIU)
2. Prepaid Control with Automatic Valve
•Built-in motorized valve
•Valve closes automatically when credit is exhausted
•Utilities maintain full control over water usage
•Anti-blocking valve protection system
3. Revenue Protection & Anti-Tampering
•Magnetic tamper detection
•Alarm
•Event logs stored in memory
System Architecture
A complete STS prepaid metering system includes:
1.STS Prepaid Water Meter
2.CIU (Customer Interface Unit) – optional
3.STS Vending System
4.Management Software / Cloud Platform
Advantages of STS Prepaid Water Meters
1. Guaranteed Revenue Collection
Consumers must buy credit in advance before water usage—no more unpaid bills, no manual disconnection.
2. Highly Secure STS Encryption
•International STS standard
•Prevents hacking, bypassing, and fraud
•Each token is unique and cannot be reused
3. Low Operational Cost
•Eliminates manual meter reading
•No billing disputes
•Reduced field operations for utilities
4. Easy Deployment
•Plug-and-play installation
•No communication network required
•Independent prepaid system
Integration & Vending Services
Shengda provides complete integration support:
● STS Vending System
•Free management platform
•API for utility billing system integration
● OEM / Customization
•Logo customization
Applications
•Municipal water utilities
•Village and rural water projects
•African prepaid water supply systems
•Hostels, apartments, and rental communities
•NGOs and development projects
•Emergency/limited water supply environments
| Diameter(mm) | Class | Q4(m³/h) | Q3(m³/h) | Q2(m³/h) | Q1(m³/h) | Min. Reading m³ | Max. Reading m³ |
| DN15 | B | 3.125 | 2.5 | 0.05 | 0.03125 | 0.0001 | 99999 |
| DN20 | B | 5 | 4 | 0.08 | 0.05 | 0.0001 | 99999 |
| DN25 | B | 7.875 | 6.3 | 0.126 | 0.07875 | 0.0001 | 99999 |
| DN32 | B | 12.5 | 10 | 0.2 | 0.125 | 0.0001 | 99999 |
| DN40 | B | 20 | 16 | 0.32 | 0.2 | 0.001 | 99999 |
| DN50 | B | 31.25 | 25 | 3.15 | 0.5 | 0.001 | 99999 |
