Smart STS Keypad Prepaid Water Meter
Daweda DDW-MI01 smart STS keypad prepaid Water Meter works in both prepaid and postpaid mode, providing stable and reliable measurement function. Communication modules can be RS485, RF,GPRS NB-IoT or other wired/wireless modules. Widely used in suitable on-site environments such as residential areas, apartments, school dormitories, government agencies, public buildings, etc.
Description
Main Features
✮Comply with GB/T778-2018, JJG162-2009, CJ/T224-2012 and other standards;
✮Dry/wet optional, non-magnetic measurement or pulse measurement;
✮vertical/horizontal optional;
✮Material: copper, ductile iron, stainless steel or nylon material optional;
✮Communication method: LoRa;
✮Power supply mode: battery power supply, low power consumption design;
✮The split design is adopted, and the water meter can be recharged and data inquired through the display unit;
✮the encryption method adopts the standard STS encryption method, and the water meter has passed the STS certification;
✮Without wiring, it can realize remote centralized reading, recharge, valve control and other functions;
✮Prepaid and postpaid mode switching;
✮The valve will automatically close when the remaining water is used up.
Parameters
Qm=Minimum flow，Qt=Transitional flow，Qp=Permanent flow，Qs=Overload flow，R=Qp/Qm
| DN(mm) | Qp/Qm | Qs | Qp | Qt | Qs | Mini reading | Max reading | |
| M3/h | L/h | M3 | ||||||
| 15 | 100 | 3.125 | 2.5 | 40 | 25 | 0.0001 | 9999 | |
| 20 | 100 | 5 | 4 | 64 | 40 | 0.0001 | 9999 | |
| 25 | 100 | 7.875 | 6.3 | 100.8 | 63 | 0.0001 | 9999 | |
Wireless Technical Parameters
| working frequency | 425～435MHz |
| effective radiated power; | 17dBm |
| Frequency stability | ±5PPM |
| Sensitivity | <-136dBm |
| Operating temperature | -20～70℃ |
| operating bandwidth | 125kHz/250kHz |
| Operating Voltage | +2.8～6V |
| Receive current | ≤20mA |
| mission current | ≤130mA |
| Launch time | Maximum launch time≤1.5s |
| Launch interval | Max.24 hours |
| Transmission distance | Line of sight≥5000 meters |
| Valve electrical parameters | voltage2.8～6V，current≤160mA |
| dormancy current | ≤8uA |
| Average operating current | ≤20uA |
| dimension | 42.1mm*24.8mm*3.2mm |
Basic Parameters
- Supply Size:DN15~DN25
- Body Material: Brass
- R(Q3/Q1)=100
- Max.work pressure: 1.0MPa
- Protection class:IP68
- Battery capacity: more than 8 years
- Pressure loss: ≤ 0.063mpa
