To expand research and analysis capacities, the working group “Isotopes Biogeochemistry and Gas Flows” of program area 1 of ZALF is planning to purchase a multigas sensor (GHG) as part of the “POTENTION” project project. The device is designed to simultaneously record carbon monoxide (CO), water vapor (H2O) and nitrous oxide (N2O) concentrations in ambient air to calculate corresponding flows. The multi-gas sensor is not permanently mounted but is used as a field device, which is why field suitability is a high priority. Gas flow measurements are carried out using manual gas collection hoods. To record the current gas flows, the hoods are lowered for a short time (approx. 10-20 minutes) onto frames anchored in the ground. During the lowering process, the concentrations of H2O, CO and N2O, or their changes, are to be measured simultaneously, inside each 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 with the help of advanced technology developments in the agricultural and environmental sectors. To expand research and analysis capacities, the working group “Isotopes Biogeochemistry and Gas Flows” of program area 1 of ZALF is planning to purchase a multigas sensor (GHG) as part of the “POTENTION” project project. The device is designed to simultaneously record carbon monoxide (CO), water vapor (H2O) and nitrous oxide (N2O) concentrations in ambient air to calculate corresponding flows. The multi-gas sensor is not permanently mounted but is used as a field device, which is why field suitability is a high priority. Gas flow measurements are carried out using manual gas collection hoods. To record the current gas flows, the hoods are lowered for a short time (approx. 10-20 minutes) onto frames anchored in the ground. During the lowering process, the concentrations of H2O, CO and N2O, or their changes, are to be measured simultaneously, inside each 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 performance features (minimum requirements):
specifications
- Simultaneous recording of the concentration of water vapor (H2O) carbon monoxide (CO) and nitrous oxide (N2O) in air
- Field suitability: portable (<10 kg), battery operation required for several hours (min. 2 h), battery replacement possible, splash-proof
- Measurement precision over a measurement time of 1 s: CO: <1ppb, N2O: <1 ppb
- Measuring range: CO: 0-500 ppm, N2O: 0-500 ppm
- Measurement frequency: variably adjustable between 1 s and 1 min
- Maximum drift over 24 h: < 2% of the respective measuring range after zero point setting
- Ensure undisturbed measurements despite minor vibrations caused by movement in the field
- Interfaces: digital (RS-232), USB
- Temperature range of air samples: 5 to 40 degrees Celsius
- Working temperature: 5-35 degrees Celsius
- 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 demands an appropriate manufacturer's warranty, including exchange or repair. Within Germany, exchanges are made via a pick-up and return service. Telephone support must be guaranteed. The contractor must ensure that the sensor can be restarted within two months.
The multi-gas sensor should be delivered 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 taken into account in the offer in order to avoid restocking.
The multi-gas sensor to be procured should make it possible to record the changes in the concentrations of the greenhouse gases water vapor (H2O), carbon monoxide (CO) and nitrous oxide (N2O) inside opaque and/or transparent gas hoods simultaneously with high precision. They must be able to carry out these measurements without problems over a wide temperature range outdoors throughout the year (taking into account the temperature specifications in each case). The multi-gas sensor is operated manually and is continuously moved back and forth by scientific personnel via a field test. The small vibrations caused by this movement must not have any influence on the functionality of the analysers.
Device as advertised or equivalent.