STW36-A Keypad Prepaid Water Meter

Integrated keypad prepaid water meter designed for controlled water distribution and secure billing in residential and utility applications. The keypad interface is built into the meter, enabling direct user interaction for credit input and account 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.

With IP68 protection, the unit ensures reliable operation in demanding environments. Features such as magnetic tamper protection and real-time clock support secure and stable system performance.

Equipped with LoRa-RF communication, the meter supports data transmission and integration into centralized management platforms. It also supports mobile payment options such as M-PESA, Alipay, MTN and Airtel, enabling flexible 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.

Start a Project Discussion

STW36-A is an STS Standard compliant,keypad type,automatically valve controlled Multi-jet prepaid water meter.It can be top up by pay vending software with 20 digital Token and communicate with AMl system via LORA-RF module.

Compliance with Standard

ISO9001; ISO14001；STS Certificated

Application

Measuring the volume of gas through gas pipes.

Metrological Parameters of different size

SizeDN15   1/2″DN20   3/4″   DN25   1″

Overload flow rate Q4
3.13
5
7.87

Permanent flow rate Q₃
2.5
4
6.3

Transitional flow rate Q₂
0.04
0.064
0.1

Minimum flow rate Q₁
0.025
0.04
0.063

Ratio”R”Q₃/Q₁
100
100
100

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)
165/190
190
225/260

Width(W)
99
99
103

Height(H)
104
106
114

Connecting Thread
G3/4B
G1B
G1-1/4B

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.