Ausschreibung | Call for Tenders | Procurement of Dendrometer Stations for the EU Project SCAN-DANUBE
Within the framework of the EU-funded project “Strategies for Conservation of narrow-leaved ash populations (SCAN-DANUBE, DRP0300848)”, BFW (Project Partner 2) intends to procure dendrometer stations for the continuous monitoring of stem growth, climate and soil parameters.
Interested companies are invited to submit a written offer.
Technical Specifications
Dendrometers
- 12 circumferential dendrometers (increment sensors) for trees with trunk circumference >10 cm
- Resolution ≤ 1 µm, integrated data logger, adjustable interval (10 minutes – 2 hours)
- Suitable for year-round outdoor use, operational even with water levels up to 1 m above ground
- Battery life ≥ 4 years with hourly recording (batteries included, replacements available)
- Battery replacement possible without removing the device from the tree
- Non-invasive mounting (no screws, nails, pins penetrating the stem)
- Cable length ≥ 10 m, extendable to 20 m, with protective sleeve
- Data download possible without removing the device (Bluetooth, IR, WiFi, USB, HDMI etc.)
- 1 download cable included, additional units available for purchase
Station Mounts
- 2 robust mounting systems for year-round outdoor use, tripod solutions not acceptable
- No securing with wire, chains or ropes
- Preferred: galvanized ground screw ≥ 50 cm with stainless/galvanized pipe ≥ 1 m, sealed top cap
- Functional during periods of up to 1 m flooding above surface
Climate and PAR Sensors
- Air temperature: -30 °C to +60 °C, accuracy ±0.2 °C
- Relative humidity: 0–100 %, accuracy ±2 %
- Both placed in radiation shield with integrated PAR sensor (±5 %) and bubble level
- Online data transmission at least twice per day
Soil Sensors
- 3× soil moisture sensors (minimum 1 mandatory), range 0–100 %, accuracy ±3.5 %
- 2× soil water potential sensors, range -10 to -1800 kPa, lifespan ≥ 10 years
- 2× soil temperature sensors, -40 °C to +50 °C, resolution ≤ 0.1 °C
- Cable length ≥ 4.5 m, protected against mechanical stress
- Online data transmission at least twice per day
Control and Communication Unit
- Suitable for year-round outdoor use, max. weight incl. battery ≤ 4 kg
- Battery life ≥ 1 year (not solar powered)
- Communication via Bluetooth, IR, WiFi, USB, HDMI etc.
- Software compatible with Windows, export to .xls/.xlsx/.csv/.txt
- 1 communication cable included, additional units available for purchase
Additional Requirements
- Installation tools: at least 1 of each type included, more available for purchase
- Mounting material for 12 dendrometers on trees with 30 cm diameter included
- Additional mounting material available within 14 days upon request
- Technical support via e-mail and telephone in English, incl. installation guidance
- Continuous access to data via online platform (33-month subscription to be offered separately)
- Minimum warranty: 1 year
Submission of Offers
- Deadline for submission: 25 September 2025
- Form: Written offer in Euro (excl. VAT)
- Send to: katharina.schwanda(a)bfw.gv.at
- Questions & Contact: Mag. Dr. Katharina Schwanda, +43 664 43 22 706, katharina.schwanda(a)gmail.com