In order to expand research and analysis capacities, the working group “Isotope Biogeochemistry and Gas Flows” in program area 1 of the ZALF is planning to purchase a multigass sensor (GHG) as part of the “WIN-N” project project. The plan is to simultaneously record current water vapor (H2O), carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ammonia (NH3) concentrations in ambient air to calculate corresponding flows. The multi-gas sensor is not permanently mounted but is intended as a field device, which is why field suitability is a high priority. The gas flow measurements are carried out using manual gas collector hoods. To record the current gas flow, the hoods are lowered briefly (approx. 5-20 minutes) onto frames that are anchored to the ground. During the reduction, the concentrations of H2O, CO2, CH4, N2O and NH3 and their changes are to be measured simultaneously inside one hood using the multi-gas sensor advertised here.
The Leibniz Center for Agricultural Landscape Research (ZALF) in Müncheberg wants to strengthen international cooperation and third-party funding by means of further technology developments in the agricultural and environmental sector. In order to expand research and analysis capacities, the working group “Isotope Biogeochemistry and Gas Flows” in program area 1 of the ZALF is planning to purchase a multigass sensor (GHG) as part of the “WIN-N” project project. The plan is to simultaneously record the current was-servapor (H2O), carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ammonia (NH3) concentrations in ambient air for the calculation of corresponding flows. The multiga sensor is not permanently mounted but is intended as a field device, which is why field suitability is a high priority. The gas flow measurements are carried out using manual gas collection hoods. To record the current gas flow, the hoods are briefly loomed (approx. 5-20 minutes) to frames that are anchored to the ground. During the reduction, the concentrations of H2O, CO2, CH4, N2O and NH3 and their changes are to be measured simultaneously inside one hood using the multi-gas sensor advertised here. The measurements are to be carried out continuously throughout the year.
A multi-gas sensor is to be procured, which should have the following features (minimum requirements):
specifications
- Capability to simultaneously detect the concentration of greenhouse gases water vapor (H2O), carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ammonia (NH3) in air
- Field suitability: portable (<10 kg), battery operation for several hours (min. 3 h) possible, battery change possible, splash-proof
- Measurement precision with a measurement time of 60 s: H2O: 0.01% vol%, CO2:5 ppm, CH4:40 ppb, N2O: 7 ppb, NH3:70 ppb
- Measurement range: H2O: 0-3 vol%, CO2:0-2000 ppm, CH4:0-15 ppm, N2O: 0-5 ppm, NH3; 0-15 ppm
- Measurement frequency: variably adjustable between 1 s and 1 min
- Maximum drift over 24 h: H2O: 100 ppm, CO2:; 1 ppm CH4:1 ppb, N2O: 0.5 ppb
- Response time: 3 s
- Ensure undisturbed measurements despite minor vibrations caused by movement in the field
- Interfaces: digital (RS-232), analog (especially for recording CH4 and N2O data on data loggers), LAN, USB
- temperature range of air samples ፦5 to 40 oC
- Working temperature: 5-30 oC
- connections for gas inlets and outlets
- Record, control and store data in real time
- Ability to quickly calibrate the measurement system on site using calibration gas mixtures
The client requires an appropriate manufacturer's warranty including replacement of defective components and components. The exchange takes place via a pickup and return service. Phone support must be guaranteed at all times. In the event of major outages, manufacturer support on site should be scheduled after unsuccessful telephone support. The contractor must ensure that the sensor is restarted within two weeks.
The multi-gas sensor is to be supplied in its entirety, i.e. all accessories required for smooth operation and evaluation (e.g. ancillary devices, cables, hose connections, interfaces, software, etc.) must be included in the offer in order to avoid replenishment.
The multi-gas sensor to be procured should make it possible to simultaneously detect changes in the concentrations of the greenhouse gases water vapor (H2O), carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) and ammonia (NH3) inside opaque and/or transparent gas hoods with high precision. They need to be able to perform these measurements trouble-free over a wide temperature range outdoors throughout the year. The multigasensor is operated manually and is continuously moved back and forth by scientific personnel over a field trial.