Upper-air measurement · Materials rethought
iMet-54 ecoSame performance.
More considered materials.
The iMet-54 radiosonde you know, with an microbial-degradable plastic housing and a fresh approach to labels and packaging. All technical specifications remain the same as the standard iMet-54.
Lightweight construction
Operating time
Maximum telemetry range
GPS, GLONASS, BDS, Galileo, QZSS
01 / Eco materials
A thoughtful evolution of the iMet-54.
Changes to the housing, label and packaging bring environmental considerations into the product design while retaining the standard iMet-54 measurement capability.
Plastics evolved
The plastic housing contains microbial-degradable additives designed to accelerate biodegradation in marine environments and active landfills.
Reduced electronic impact
A thinner PCB substrate and reduced electronic componets lessens the neccessary evil.
Cardboard packaging
All outer packaging is cardboard, paired with an oxo-biodegradable zip-lock bag.
Understanding biodegradation
Biodegradation rates vary depending on plastic type, product configuration, and environmental conditions. Tested to show accelerated biodegradation under ASTM D5511 (landfills) and ASTM D6691 (marine) standards. This does not establish a breakdown time for the finished iMet-54 eco, or mean that the complete radiosonde, battery and electronics are biodegradable or compostable.
02 / Technology
Key features
Improved measurement techniques address evaporative cooling and humidity sensor icing.
- Capacitive thin-film polymer humidity sensor with integrated heater for fast response at low temperature
- Dynamic heating of the humidity sensor prevents saturation or ice formation on the sensor.
- A very small mass glass bead thermistor facilitates extremely fast response to temperature changes. Reflective coating reduces the effects of solar radiation while a hydrophobic polymer counters evaporative cooling events
- SI traceable sensor calibration
- High sensitivity, multi-constellation GNSS receiver with unparalleled accuracy of wind and altitude measurement
- ETSI certified telemetry transmitter provides error free data transmission without interference. Forward-error correcting techniques ensure fault correction for a highly robust telemetry link
- Pre-installed dry lithium battery. Easy-to-use push-button controls power and pre-set transmission frequencies
- User-selectable transmission frequency anywhere within the assigned meteorological frequency band
- No pre-flight recalibration required – all sensors are factory calibrated
- Compact and light weight: 235 x 70 x 30 mm and only 80 grams
- Microbial-degradable plastic housing, with the same technical specifications as the standard iMet-54
03 / Technical data
Specifications
Identical to the standard iMet-54: sensor performance, system characteristics and telemetry specifications.
System overview
| Battery | Lithium |
| Operating time | > 180 min |
| Dimensions (L x W x H) | 235 x 70 x 30 mm |
| Weight | 80 g |
| Calibration Stability | 2 years |
| Power control | Wireless or Push button |
GPS Receiver
| Type | GNSS |
| Channels | 99 Channels |
| GNNS Systems | GPS, GLONASS, BDS, Galileo, QZSS |
| Cold Start Acquisition Time | 35 s (nominal) |
| Reacquisition Time | 1 s (nominal) |
| Horizontal Position Accuracy | 1.5 m (CEP) |
Humidity
| Type | Capacitive Thin Polymer |
| Range | 0 % to 100 % RH |
| Resolution | 0.01 % RH |
| Response Time | |
| 6 m/s, 1000 hPa, +20°C | < 0.4 s |
| 6 m/s, 1000 hPa, 0°C | < 1 s |
| 6 m/s, 1000 hPa, – 20°C | < 3.2 s |
| 6 m/s, 1000 hPa, -40°C | < 20 s |
| Repeatability in Calibration | < 2 % RH |
| Uncertainty | < 4 % RH |
| Reproducibility | < 3 % RH |
Temperature
| Type | Bead Thermistor |
| Range | -100 °C to + 60°C |
| Resolution | 0.01 °C |
| Response time (still air @ 1000 hPa) | < 2 s |
| Response time (6 m/s flow @ 1000 hPa) | < 0.5 s |
| Repeatability in Calibration | < 0.1 °C |
| Uncertainty > 100 hPa | < 0.3 °C |
| Uncertainty < 100 hPa | < 0.5 °C |
| Reproducibility > 100 hPa | < 0.1 °C |
| Reproducibility < 100 hPa | < 0.25 °C |
Pressure (GNSS derived)
| Type | GNSS derived |
| Range | 1100 to 3 hPa |
| Resolution | <0.01 hPa |
| Uncertainty: 1100 – 400 hPa | < 1 hPa |
| Uncertainty: 400 – 100 hPa | < 0.4 hPa |
| Uncertainty: 100 – 3 hPa | < 0.2 hPa |
| Reproducibility: 1100 – 400 hPa | < 0.6 hPa |
| Reproducibility: 400 – 100 hPa | < 0.3 hPa |
| Reproducibility: 100 – 3 hPa | < 0.2 hPa |
Telemetry
| Transmission type | Synthesized |
| Maximum range | >250 km |
| Frequency band | 400.15 – 406 MHz OR 1668.4 – 1690 MHz |
| Frequency stability | ±2 kHz |
| Deviation (peak to peak) | 4.8 kHz |
| Output power | 200 mW |
| Emission Bandwidth | According to EN 302 054 for 403MHz model According to EN 302 454 for 1680MHz model |
| Sideband Radiation | According to EN 302 054 for 403MHz model According to EN 302 454 for 1680MHz model |
| Modulation | GFSK |
| Data rate | 4800 bit/s |
| Frequency selection | Wireless or push button |
| Push button frequencies | 402, 403, 404, 405 MHz OR 1676, 1678, 1680, 1682 MHz |
| Wireless frequency selection | 400 – 406 MHz (10 kHz resolution) OR 1668.4 – 1690MHz (10kHz resolution) |
Wind
| Type | GNSS derived |
| Wind Speed Range | 0 to 180 m/s |
| Wind Speed Resolution | 0.1 m/s |
| Wind Speed Uncertainty | < 0.15 m/s |
| Wind Speed Reproducibility | < 0.1 m/s |
| Wind Direction Range | 0 to 360° |
| Wind Direction Resolution | 0.01° |
| Wind Direction Uncertainty | < 1° |
| Wind Direction Reproducibility | < 1° |
Geopotential Height
| Type | GNSS derived or optional Piezoresistive Sensor |
| Range | 0 to 50 km |
| Resolution | 0.1m |
| Uncertainty | < 8m |
| Reproducibility | < 5m |
04 / Product enquiries
Specify the eco version.
The same iMet-54 specifications, with the eco materials described above.
Contact InterMet for iMet-54 eco availability, configuration options and the appropriate ordering code.
Enquire about iMet-54 eco ↗05 / Resources
Product documents
Standard iMet-54 brochures provide the shared technical specifications. Eco material changes are described on this page.
