STW36-B Split Keypad Prepaid Plastic Water Meter

Split-type prepaid water meter designed for controlled water distribution and secure billing in residential and utility applications. The system consists of a meter unit and a separate keypad-based customer interface unit (CIU), enabling convenient user interaction and remote management.

The meter supports STS-compliant prepaid functionality and allows utilities to implement flexible tariff structures, including step pricing. An integrated valve enables automatic control of water supply based on credit status.

Built with IP68 protection, the unit ensures reliable operation in challenging environments. Features such as magnetic tamper protection and real-time clock support secure and stable operation.

With LoRa-RF communication, the system enables data transmission and integration into centralized management platforms. It also supports mobile payment options such as M-PESA, Alipay, MTN and Airtel, facilitating flexible payment and deployment across different regions.

Designed for long-term use, the meter offers up to 8 years of battery life, supporting cost-effective operation in large-scale prepaid metering systems.

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Smart Split Keypad Water Meter is composed of a Multi-jet prepaid water meter and a separate customer interface unit(CIU)with RF wireless communication module.

Compliance with Standard

ISO9001; ISO14001；STS Certificated

Application

Measuring the volume of gas through gas pipes.

Metrological Parameters of different size


Size		DN15   1/2″DN20   3/4″DN25   1″
Overload flow rate Q43.1357.87
Permanent flow rate Q₃2.546.3
Transitional flow rate Q₂0.040.0640.1
Minimum flow rate Q₁0.0250.040.063
Ratio”R”Q₃/Q₁100100100

Basic Functions

◎ Maximum working pressure:16 Bar

◎ Maximum pressure loss:0.6 Bar

◎ Maximum   reading:99999

◎ Working temperature:<50℃

◎ Error:Q≤Q≤Q₂   5%;   Q₂≤Q<Q₄   2%

Meter Dimension


Size		DN151/2″DN203/4″DN251″
Length(L)165/190190225/260
Width(W)9999103
Height(H)104106114
Connecting ThreadG3/4BG1BG1-1/4B

Basic Functions

◎ Meter Recharge:By inputting 20 digits Token.

◎ Low Credit Alarm:Alarm value can be set by inputting corresponding TOKEN.

◎ Non-return valve:Non-return valve inside for preventing back-flow.

Step Tariff

Meters can be set Step Tariff by inputting corresponding TOKEN.Utilities can set 3 step prices on request.

Communication

The meter is available with AMI system through   LORA-RF or Bluetooth 4.0 on request.

Anti-Tamper Functions

Meter will automatically close the valve after detection of magnetic field and open cover event.Working normally after inputting clear tamper Token.