The Hydrasonic S8 ultrasonic BTU meter is designed for measuring the energy consumption in heating/cooling application for billing purpose. Its static ultrasonic technology is based on the measurement of the transit time.
It offers benefits like easy battery & temperature sensor replacement, IP68 protection, no straight run requirements, and M-Bus and Wireless M-Bus communication options.
General
| Application | - | Heating or bi-functional (heating/cooling) | Heat-transfer fluid: glycol-free water |
| Approval | - | In compliance with MID-EN1434 |
| Accuracy class | - | Class 2 |
| Ambient temperature | °C | +5 ... +55 |
| Storage temperature | °C | +5 ... +55 | max. –20…+60 (max. 4 weeks) |
| Humidity | % | 95 maximum |
| Battery supply | - | 3.6 VDC |
| Temperature sensor type | - | PT1000 , 2-wires: Ø 5.2 mm |
| Cable length of temperature sensor | m | 1.4 |
| Test possibilities | - | via display |
| Volume measuring cycle | s | 2 |
| Temperature measuring cycle | s | 30 |
| Power calculation cycle | s | 2 |
Calculator
| Protection class | - | IP66 (Optional IP67) |
| Environmental class-mechanical | - | M1, M2 |
| Environmental class electromechanical | - | E1, E2 |
| Calculator | - | Removable, with 1.5m cable to flow sensor |
| Absolute temperature range | °C | +1…+90 (+150 optional) |
| Starting temperature difference ΔΘ | K | 0.125 |
| Min. temperature difference ΔΘmin | K | In compliance with MID |
| Max. temperature difference (heating) ΔΘmax | K | 147 (In compliance with MID) |
| Extensive readable data memory | - | Monthly for 18 months (hourly, daily, yearly optional) values of energy, volume and error hours; additionally event memory (error log) |
| Interchangeable components | - | Battery (Standard) ; Temperature sensors (Optional) |
Flow Sensors
| Dynamic range (Qp/Qi) | - | 1:100 |
| Mounting position flow sensor | - | Any position, no straight run requirements |
| Temperature range (heating/ cooling) | °C | 2-87* |
| Protection class | - | IP68 (heating/cooling) |
Interfaces
| Optical | ZVEI interface, for communication and testing. M-Bus protocol |
| Display | LCD-8 digit |
| M-Bus | According to EN13757-3: 2013 |
| Wireless M-Bus | According to EN13757-4; 2013 |
Display
| Display indication | LCD-8 digit + special characters |
| Units | kWh - m³ - °C - m3 /h* |
| Total values | 99,999.999 |
| Values displayed (main loop) | Energy - Volume - Flow - Power - Temperature - Differential temperature - Operating hours - Meter SN-Meter size-Meter time-Error Status - Display test |
M-Bus
| M-Bus | Auto baud detect (300 and 2,400 bauds); galvanically insulated |
| M-Bus cable | 24 AWG , 2 Core |
| Data transmission | Data reading via 2 non-polarized wire (1.5m) |
| Battery life-time | Up-to 12 years* |
Flow Sensor Technical Data
| Measuring Method | Ultrasonic; Time of Flight |
| Nominal Diameter | mm | DN15 | DN20 | DN25 | DN32 | DN40 |
| Nominal flow qp | m³/h | 1,5 | 2,5 | 3,5 | 6,0 | 10,0 |
| Low flow threshold | m³/h | 0.006 | 0.012 | 0.014 | 0.03 | 0.05 |
| Minimum flow qi | m³/h | 0.015 | 0.025 | 0.035 | 0.06 | 0.1 |
| Maximum flow qs | m³/h | 3,0 | 5,0 | 7,0 | 12,0 | 20 |
| Pressure drop Δp at qp | Bar | 0,21 | 0,12 | 0,21 | 0,20 | 0,11 |
| Pressure drop Δp at qs | Bar | 0,85 | 0,46 | 0,89 | 0,80 | 0,43 |
| Thread | inch | G3/4B | G1B | G1 1/4B | G1 1/2B | G2B |
| Length | mm | 110 | 130 | 160 | 180 | 200 |
| Dynamic range Qp/Qi | - | 1:100 | 1:100 | 1:100 | 1:100 | 1:100 |
| Accuracy class (MID) | - | Class 2 | | | | |
| Nominal pressure PN | Bar | 16 / 20 (Optional) | | | | |
Dimensions
| Nominal flowrate Qp (m³/h) min | Maximum flowrate Q max | Nominal diameter (DN) | Thread G (in) | Length L (mm) | Approx. weight (kg) |
| 1,5 | 3,0 | DN15 | G 3/4 B | 110 | 0,720 |
| 2,5 | 5,0 | DN20 | G 1B | 130 | 0,770 |
| 3,5 | 7,0 | DN25 | G 1 1/4 B | 160 | 0,930 |
| 6,0 | 12,0 | DN32 | G 1 1/2 B | 180 | 1,255 |
| 10,0 | 20,0 | DN40 | G2 B | 200 | 1,580 |
