NB-IOT

Introduction of the function of dual water meter in China water cloud joint NB-IOT Internet of things

I. Featured Functions

1. Double billing mode: post-payment and pre-payment can be selected as two alternatives, and the pre-payment function can control the expenses on the surface;

2. Various pricing schemes: in addition to supporting monthly, quarterly and annual stepped water prices, they also support the mixing of water prices with various water characteristics, which is suitable for the complex water price policy of self-built houses and industrial parks.

3. Prepaid belt teletransmission: that is, to meet the convenience of card prepayment management, while taking into account the water situation and the status of the water meter at any time;

4. Various recharging schemes: business hall credit card recharging, card-free remote issuing recharging (remote reverse writing), which can interface with mainstream payment tools (bank ATM, online banking, micro-mail, Alipay, Tianyi Payment, etc.) to realize mobile phone recharging;

5. Customization of teletransmission information: data such as cumulative usage, valve status, battery power, remaining amount, signal strength, etc., can be brought back with cards and teletransmission, which can be customized according to requirements;

6. Tube burst detection: water user's home water leakage is monitored automatically and the valve is closed automatically to reduce user's loss.

II. Prepayment Control

1. Circuit design of ultracapacitors to prevent valves from being closed without or with weak current.

2. Weak current or power failure protection: prevent the possibility of malicious power failure or battery depletion still using water.

3. Induction card brushing: 13.56MHz contactless high-frequency card, no opening is required for the design of contactless card, good sealing and low failure rate.

4. Pre-warning and overdraft functions: when the balance reaches the pre-warning value, the valve closes automatically, when the user swipes the card, the valve opens automatically. When the overdraft amount reaches the preset value, the valve can not be opened until it has been recharged. The battery is under-charged alarm function.

5. Pricing function: Pricing is completed on the form, with the functions of classified and step-by-step pricing, which supports the switching of monthly, quarterly and annual steps. The step-by-step pricing can reach more than 6 levels and has the function of mixed water pricing with two or more water-using properties.

6. Protection against magnetic interference and weak current outage: When magnetic interference occurs, the valve closes automatically and opens automatically after brushing management card.

7. LCD screen displays date, accumulated usage, remaining amount, current step and unit price, current switch status of valve, power supply status, fault code and other information.

8. Encryption security: one table (one household) and one card automatically generate and identify IC card passwords, which correspond to each other and are not interchangeable.

3. Software platform docking

1. Communicate by COAP protocol and interface with the operator Internet of things platform;

2. Develop host computer service independently and complete analysis by real-time communication with Internet of Things platform;

3. All-network communication is mixed with multi-platforms. Water meter management only needs to complete multi-platform control through meter reading system, and it does not need to login to operator platform separately for complex operation.

4. For the early communication using UDP or TCP/IP protocol, the upper computer can connect with the water meter directly and quickly and analyze;

5. Docking with third party provides PROFILE file and parsing dynamic library file.

6. Intuitive water meter management interface, displaying information such as water consumption, balance, remaining electric quantity, signal strength and water meter failure state.

IV. Main Performance Parameters

Standby current

Recommended battery capacity: >6000mA not less than 8 years (meter reading once a day, reporting time can be customized)

Installation Requirements

(1) Do not install in the metal water meter box. Check whether the NB-IOT signal is on before installation and measure the signal strength.

(2) Before installing, remove the silk, sand and other impurities in the branch pipe to avoid blocking the water meter.

(3) The arrow on the water meter housing must be in line with the horizontal direction of water flow during installation.To ensure the accuracy of measurement, it is required to leave 6-12 times nominal diameter straight pipe section in front of the water meter and 4-6 times nominal diameter straight pipe section behind the water meter.