The PP Systems Ramp Path Equalizer for CIRAS-3/4 (STD581) is an adjustable gas-path accessory for the Single-Step CO2 Response, or SSCO2R, Method. Installed between the AIR OUT and REF IN ports, it increases the reference-line volume so the reference and analysis channels respond consistently during a CO2 ramp.
Key Features
- Purpose-built for the SSCO2R Method, supporting rapid A/Ci response-curve measurements with compatible PP Systems equipment
- Compatible with CIRAS-3 and CIRAS-4 systems, providing a manufacturer-specified accessory for both portable photosynthesis platforms
- Balances gas-path response times, increasing the reference-line volume to match the response of the reference and analysis channels
- Direct rear-panel installation, connecting between the AIR OUT and REF IN ports of the CIRAS console
- Adjustable syringe volume, allowing the path volume to be matched for the selected cuvette flow rate
- Controlled setup adjustment, with CIRAS-3 guidance specifying changes in 5 mL increments while monitoring the CO2 differential
- Near-zero CO2 differential target, with CIRAS-3 guidance specifying stabilisation between -1 and +1 µmol mol-1
- Reusable setting for repeated ramps, with no further plunger adjustment required while the applicable flow rate and system configuration remain unchanged
Note: Complete the required Stored Diff Balance calibration before use. Readjust the equalizer after changing the cuvette flow rate; CIRAS-3 guidance also requires a new adjustment after changing the cuvette head plates.
Benefits
- Supports the SSCO2R workflow for producing A/Ci response curves in real time without a separate empty-chamber correction process.
- Simplifies reference-path volume matching through an adjustable syringe rather than relying solely on fixed tubing lengths.
- Allows repeated leaf ramp experiments at the same flow rate without readjusting the equalizer between measurements.
- Provides a manufacturer-documented setup accessory for both CIRAS-3 and CIRAS-4 photosynthesis systems.
Why Choose the PP Systems Ramp Path Equalizer for CIRAS-3/4 (STD581)?
The STD581 provides a controlled method for matching reference and analysis gas-path response during SSCO2R measurements. John Morris Group can assist with confirming CIRAS compatibility, installation requirements and the correct calibration procedure for your plant gas-exchange workflow.
