Binder CO2 gassing module for climate chambers, control range 0 to 1 vol.%, NDIR sensor, 8012-2140

In a closed climate chamber, plants consume CO₂ during photosynthesis, which can cause the concentration to fall below the natural ambient level of around 0.04 vol.%. The Binder CO₂ gas supply module 8012-2140, on the other hand, maintains the concentration precisely between 0 and 1 vol.% and is therefore designed for plant growth applications where precise, low CO₂ control is required. It is an accessory for Binder KB PRO series refrigerated incubators and KBF and KBF PRO series constant-climate chambers, all of which are at development stage E7.

Measurement and control

CO₂ measurement is carried out by an infrared measuring cell with an NDIR sensor (non-dispersive infrared sensor) and continuous control to a reference value. According to the manufacturer, this measurement method offers fast response times and high selectivity for CO₂; interference and ageing effects in the measurement system are largely ruled out, meaning that the system remains virtually drift-free between calibrations. The control process itself is managed entirely via the MB2 controller of the climate chamber; the gas injection module cannot be operated without being connected to the climate chamber. To ensure the CO₂ concentration is displayed correctly in vol.%, the altitude of the installation site must also be entered into the controller. As this control range uses a separate CO₂ sensor to that of the 0–20 vol.% variant, the controller function ‘CO₂ measurement range 0…1 vol.%’ must also be activated to ensure the measured value is converted correctly.

Connections and interfaces

The CO₂ gas injection unit has a 4 to 20 mA analogue output for the CO₂ concentration, via which the measured value can be transmitted to external data acquisition systems or recording devices. The gas connection is made via a quick-release coupling on the gas cylinder, whilst the data connection to the climate chamber is via a patch cable. A CO₂ gas cylinder is not included in the scope of delivery and must be procured separately.

Combination with other accessory modules

According to the operating instructions, the CO₂ gas module can be operated simultaneously with the LED plant light module; both accessories complement each other for comprehensive plant growth applications with controlled lighting and CO₂ concentration within the same cabinet. However, simultaneous operation with the ICH light module or the ICH-LQC light module is not possible, as both accessories occupy the same interface on the climate chamber. Anyone requiring both configurations – for example, CO₂ gasation and the ICH photostability test – should plan for two separate climate chambers. For pure plant growth experiments with LED lighting and CO₂ enrichment, however, a single, suitably equipped climate chamber is sufficient.

Operation and maintenance

A fine gas filter in the gas injection box can be replaced as required to ensure that measurement accuracy is maintained throughout the operational life of the unit. Two CO₂ warning stickers are included in the scope of delivery and must be affixed to a clearly visible position on the climate chamber, as special safety instructions must be observed when handling CO₂ in enclosed spaces. Before initial commissioning, the correct CO₂ outlet pressure of the gas supply and the tightness of the connections must be checked. A connection panel on the rear of the incubator or climate chamber houses the data connection to the gas supply unit, ensuring that the cabling remains neatly organised.

Typical applications

• CO₂ enrichment for accelerated plant growth in combination with the LED plant light module
• Photosynthesis and growth studies with a defined, low CO₂ concentration
• Offsetting CO₂ consumption in densely planted, enclosed climate chambers
• Botanical and agricultural research series with reproducible climatic conditions

The CO₂ injection box is installed on the prepared side panel of the climate chamber and connected to the main unit via a data cable, gas hose and sensor cable.

Technical details

Scope of supply

• CO₂ fumigation box
• CO₂ sensor with cable
• 2 CO₂ warning stickers
• 24 V mains adaptor with adaptors
• Operating instructions
• 2 mounting rails with screws (4 × M8, 2 × M5)
• 2 silicone foam plugs for the slotted hole feed-through
• Patch cable for the data connection between the gas supply box and the device
• Hose set for the gas connection

The CO₂ gas cylinder and pressure regulator are not included; these must be purchased separately.

Customised requirements & procurement service

LT Laborhandel provides procurement support when choosing between the CO₂ control ranges of 0 to 1 vol.% and 0 to 20 vol.%, as well as when combining the system with an LED plant lighting module or water supply systems. Details can be found on our services page.