HR8801 Water level and temperature recorder is a groundwater monitoring instrument which can be either external powered or internal battery self-powered it is used for the long-term recording of the depth (pressure) and the temperature. The transmitter contains the water level and temperature sensor built-in large capacity non-volatile memory and high capacity long-life lithium battery it ‘s entire stainless steel structure enables all functions are integrated inside a me
Dry capacitive ceramic sensor
Nice stability on long-term service
High precision up to 0.05% F.S
Strong overload capability preservative
Full temperature compensation full scale digital calibration
RS485 standard MODBUS-RTU protocol can be used in DCS or PLC systems
| Main performance specification | |
| Water level range | 0～10 20 50 80 100mH2O |
| User can specify range and factory calibrate | |
| Accuracy | ±0.05％F·S |
| Resolution | 0.005％F·S |
| Long-term stability | ＜±0.05%F·S/year |
| Overload capacity | ＞5X F·S |
| Recording frequency | 1～5760minute |
| Temperature resolution | 0.05℃ |
| Accuracy of temperature sensor | ±0.2 ℃（0～70℃） |
| Internal battery life | 10years (Record once /60 minutes) |
| Storage Capacity | ＞50000sets data(water level temperature time and power voltage) |
| Real Time Clock | ＜±5minutes/year |
| Temperature characteristics | |
| Compensation temperature | 0～50℃ |
| Working Temperature | -20～85℃ |
| Storage Temperature | -40～125℃ |
| Electrical characteristics | |
| Supply voltage | External power: 5～30VDC |
| Internal power: 2.7～3.6VDC | |
| Communication interface protection | 2KV surge voltage |
| Load capability | 128 device addressing nodes |
| output method | RS485 interface MODBUS-RTU protocol |
| Transmission distance | 1000m |
| stand-by current | ＜5µA |
| Working current | About 4mA |
| Insulation | 100MΩ @50V |
| Mechanical characteristics | |
| Sensor life | ＞107 times of full scale pressure cycle |
| Material in contact with liquid | Aluminium oxide ceramic gold plated |
| Sealing ring material | Fluoro rubber |
| Housing material | 316L stainless steel or titanium alloy |
| Cable material | PU or PVC |
| Weight | About 300g |
| Wire color | Red | Yellow | Blue | Green |
| Definition | V+ | V- | RS485-A | RS485-B |
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