THEMIS-EVO EI5.02 (ESMR5)
The themis ®evo EI5.02 index variant has been specially developed for the Dutch market and meets the requirements of ESMR5 (Enexis Smart Meter Requirements). This is an integrated electronic index with a single-key LCD matrix display that acts as a user interface. The index has a maximum battery life of 20 years, depending on meter usage, however the battery is replaceable in the field.
The gas meter equipped with themis ®evo is connected to the electricity meter via the M-Bus short-range wireless interface (868 MHz) in accordance with ESMR5. Just as a gas meter that measures volume at regular intervals reports the electricity meter, events and alarm messages are also sent as they occur. Safeguards to ensure integrity, confidentiality and authenticity during data exchange between communication partners are the latest state of the art. A secure update of the firmware in the air ensures that the technology is secure in the future and can be updated as needed to meet new requirements.
The display of the volume in the basic conditions is a special feature of the themis®evo index. Using an integrated electronic system for measuring temperature and fixed pressure, the measured volume is converted into volume under basic conditions (basic temperature Tb = 0 ° C, basic pressure pb = 1013.25 hPa), displayed on the screen, stored in the index and transmitted by communication partners.
- Wireless M-Bus (868 MHz) according to Enexis Smart Meter (ESMR5) requirements based on EN 13757
- Integrated antenna
Communication profile
Wireless M-Bus, T2 mode according to EN 13757-4
- Transfer of data per hour (eg current hourly volume value in basic conditions with time stamp and last 3 hourly values) to the electricity meter
- Two-way communication once a day (eg for time synchronization)
- Push message (eg if alarms appear)
Wireless M-Bus, operating mode C1 according to EN 13757-4
- Transmit the current volume and timestamp every 5 minutes
Security and data protection
- Secure state-of-the-art encryption and authentication:
- Symmetric encryption using AES-128 (GCM) and authentication (GMAC) according to
- EN 13757-3 (safety mode 9)
- The keys can be replaced
- The future for secure firmware updates
- Notify further device if an unauthorized access attempt is detected
- Submitting a status report daily
Scope of application
- Residential and business gas meters (BK-G… ETeB, G1.6 to G25)
- Permitted gases: natural gas, city gas, propane, butane; first to third family gases according to DIN EN 437: 2003 (DVGW Code of Practice G260)
Housing
- IP 54 according to DIN EN 60529
Gas / environmental conditions
- Gas temperature range: -25 ° C to + 55 ° C
- Ambient temperature range: -25 ° C to + 55 ° C
- Storage temperature range: -25 ° C to + 60 ° C
Volume designation in basic conditions
- Calculated conversion to volume under basic conditions (Tb, pb) based on a fixed value of psp for pressure during volume measurement
- Base temperature Tb: 273.15K ≙ 0 ° C
- Base pressure pb: 1013.25 hPa
- Fixed psp value: 1043.25 hPa
User interface
- LCD screen
- Intuitive menu navigation with one button (eg for installer or end user)
Languages
- Dutch
- Other language kits are available on request
Battery life
- Up to 20 years, depending on the use profile
- If necessary, the battery can be replaced in the field without data loss
Writing data to the index
- The integrated data logging function records the amount of gas in the basic conditions in conjunction with the current time and temperature
- Storage capacity:
- Hourly Values: 1224 records (≙ 51 days)
- Permanent (quasi-metrological) diary: 285 records
- Diary first-first-out (FIFO): 285 records
Current approvals
- MID class 1.5
- EN 1359
- CE
- EMC
- R & TTE
