Products informations

The STW36-A STS keypad-type prepaid water meter is a versatile solution for efficient water management in residential and commercial environments. It is highly suitable for homes, apartments, offices, and small businesses, compatible with standard DN15/DN20/DN25 pipes, and features user-friendly keypad-based prepaid functionality, which simplifies usage tracking and fee management for both users and administrators.

1. Core Performance & Metering Accuracy

• Compliant with STS standards, equipped with high-precision metering ICs from elite brands, Class 2.0 measurement accuracy.
• Multi-jet dry dial design, permissible error: ±5% (Q1≤Q≤Q2) / ±2% (Q2≤Q＜Q4), ensuring accurate water consumption statistics.
• Supports maximum reading up to 99999.9m³, with LCD digital + pointer dual display for clear data viewing.

2. Durability & Environmental Adaptability

• IP68 waterproof rating: Fully sealed design (epoxy circuit board + sealing ring) for waterproof, rainproof, and humidity-resistant performance, suitable for wet environments.
• Robust construction: Flame-retardant ABS thick-walled housing + precision brass primary body, brass threaded joints (G3/4B for DN15, G1B for DN20, G1-1/4B for DN25) with corrosion resistance and leak-free performance.
• Wide working pressure range: 0.2Bar~16Bar (0.02Mpa~1.6Mpa), maximum pressure loss <0.6Bar (0.06Mpa), adaptable to different water supply conditions.
• Working temperature: <50℃ (cold water meter), suitable for most indoor/outdoor installation scenarios.

3. Power Supply & Longevity

• Power source: 3.6V ER18505 lithium battery (4000mAh), low-power consumption design (working current ≤1.1mA, sleeping current ≤12uA).
• Battery life: 4-6 years of stable operation, detachable independent battery compartment for easy replacement.
• Low battery alert: Triggers warning for battery replacement, auto-locks valve with data backup if unresolved, avoiding service interruption.

4. Intelligent Functions & Operation

• Prepaid management: STS token recharge (generates 20-digit token receipt), supports recharge by amount/unit, recharge limitation (prevents overstocking when balance exceeds preset limit).
• Tariff flexibility: Configurable multi-tariff (up to 3 progressive rate tiers) via TOKEN authorization, adapting to different billing policies.
• Safety & protection: Tamper detection (auto-closes valve when magnetic interference is detected, restored via tamper-clearing token); cover opening detection and event logging.
• User-friendly features: Credit alarming (customizable threshold via TOKEN), emergency overdraft (flexible repayment of overdrawn amount), real-time clock for accurate event timestamps.

5. Communication & Remote Management (Optional)

• Communication module: 433MHz LoRa-RF wireless communication, compatible with CIU/DCU concentrators.
• Communication distance: 350m (with CIU) / 900m (with DCU), enabling remote monitoring, data collection, and centralized management.
• System integration: Seamlessly connects to StronPay vending system and third-party platforms via APIs, supporting remote data query and control.

6. Installation & Compatibility

• Pipe compatibility: Supports DN15 (15mm), DN20 (20mm), DN25 (25mm) standard pipes, meeting universal installation needs.
• Dimensions (L×W×H): DN15 (165mm×94.5mm×113.8mm), DN20 (195mm×94.5mm×113.8mm), DN25 (225mm×94.5mm×113.8mm).
• Installation type: Horizontal installation, transparent meter cover for easy wiring inspection.

7. Certification & Quality Assurance

• Complies with ISO9001 and ISO14001 quality management system certifications.
• Class B/Class C accuracy grade, meeting international industry standards for reliability and durability.