STS Token Prepaid Keypad Water Meter

The STS Token Prepaid Keypad Water Meters from Xinkong factory are designed in strict accordance with IEC 62055-41 and IEC 62055-51 international standards. They possess security capabilities including key expiration detection, key type verification, replay protection, recharge overflow protection, and protection against unauthorized operations. Supporting multi-level key management systems such as DITK/DUTK/DDTK, they meet the security application and key control requirements of prepaid water metering systems.

STS water meter modules use encrypted tokens (20-digit recharge codes) as the recharge medium, eliminating the need for IC cards and enabling "pay first, use later"—a change from traditional water usage methods and a solution to the problem of overdue water bills. Their core functions include water metering, prepaid recharge, balance alarm, anti-magnetic interference, and data storage. They offer accurate metering, ultra-low power consumption, and easy operation, meeting the needs of different customers for both use and management.

Technical parameter

Operating Voltage: DC 3.6V (disposable lithium-ion battery)

Static Current: ≤30uA

Receive Current: <=12mA

Transmit Current: <=120mA

Transmit Power: 12dBm

Operating Frequency: 433MHz

Communication Distance: 1km in open areas

Sensor Type: Reed switch, magnetoresistive sensor, etc.

Drive Current: 200mA

Operating Temperature: -20℃～55℃

Interface Definition

Function features

1 Precise measurement

Equipped with a pulse signal detection port, this STS Token Prepaid Keypad Water Meter calculates the current flow rate and records and stores various user-related data, such as cumulative flow, daily flow, and last month's flow.

It employs anti-jitter technology during pulse signal detection to effectively avoid mismeasurements caused by external interference, thus improving measurement accuracy. The water meter module also features pulse signal anomaly detection, detecting pulse signal faults and strong magnetic interference, and recording and storing these abnormal states.

It supports various sensors and sampling signals, including reed switches, magnetoresistive/Hall effect sensors, and non-magnetic sensors.

2 Voltage detection

It regularly checks the battery voltage, records the low voltage status and issues an alarm when the battery is low, and also has a power failure monitoring function to save metering data in a timely manner and prevent accidental loss.

3  real timer

It integrates a real-time clock function, ensuring high timing accuracy.

4 data restore

Historical records store 18 months of end-of-month data and daily fixed-point data for the past month.

5 valve control

It features valve actuation, timeout detection, and anomaly handling functions.

It can automatically execute valve switching actions according to the set valve switching cycle, preventing valves from seizing up due to prolonged inactivity, reducing water meter maintenance costs, and extending service life.

6 Anti-magnetic interference

When magnetic interference occurs, the module will automatically identify and record the abnormal state, and can simultaneously link the valve to close it or remain inactive.

7 prepaid

The meter calculates the remaining water volume in real time based on the accumulated recharged water volume and accumulated flow. When the remaining water volume is less than 0, the valve will automatically close. After a successful recharge, the valve will automatically open. When the valve is in the arrears closed state, the overdraft function can be activated by pressing the button on the meter.

8 LoRa communication

Communication can be established wirelessly with the CIU or a data collector. With the CIU, users can remotely operate and interact with data without close contact with the meter. The data collector gathers data such as device status and flow rate, which is then uploaded to the system platform, enabling remote centralized data collection from the water meter devices.

9 recharge function

Water can be recharged for metering devices by entering a 20-digit STS encrypted recharge token. Cardless recharge is supported, avoiding the risk of card wear and loss.

10 Query function

By entering a 4-digit query code, users can check parameters such as the remaining water volume, cumulative usage, current recharge amount, and valve status of the metering device, which are displayed clearly and intuitively.

11 Overdraft function

When the metering device runs out of remaining water and the valve is closed, the user can activate the overdraft mode by entering a specific short code to temporarily continue using water. Once the overdraft amount reaches the set value, the valve will close again, and overdrafting is not allowed a second time.

12 OTA update

No need to replace or disassemble the STS Token Prepaid Keypad Water Meter; all module programs support OTA upgrades, continuously meeting new water meter requirements and eliminating users' concerns.