27423 Scrub Module for CPEC200

Overview

The 27423 Scrub Module for the CPEC200 is an accessory to the CPEC200 Closed-Path Eddy-Covariance System. It is used to provide a source of zero air (air that contains no CO2 or H2O) to the CPEC200 for zeroing the EC155 gas analyzer. More often, a compressed-gas cylinder of zero air is used for this purpose; however, the CPEC200 scrub module may be preferable in locations where acquiring and replacing gas cylinders is not convenient. 

The CPEC200 scrub module consists of a pump and a three-stage molecular sieve. The pump is powered via a cable (included) that connects to the CPEC200 system enclosure. The first stage molecular sieve should be replaced once a year to ensure the zero air is free of CO2 and H2O.

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Technical Description

The CPEC200 Scrub Module provides a source of zero air to the CPEC200. Ambient air enters through an inlet at the base of the module, flows through a first stage molecular sieve, goes through a small pump, and flows through two more stages of molecular sieve. Zero air then emerges from the exhaust or outlet port.

The outlet port should be connected to the CPEC200 System Enclosure via tubing with 0.25 in. Swagelok® connections (pn 21823-L). The molecular sieve in the first stage cylinder should be replaced once a year to ensure the quality of zero air. Molecular sieve 13X with 1.6-2.5 mm bead diameter is recommended. Approximately 400 g (dry basis) is needed to refill one cylinder.

Specifications

Volume 480 cm3 (29.29 in.3) for each molecular sieve cylinder
Power 2 W (typical)
Dimensions 39.4 x 34.3 x 20.3 cm (15.5 x 13.5 x 8.0 in.)
Weight 9.6 kg (21.1 lb)

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Miscellaneous

Product Compatible Note
CPEC200 (retired)
CPEC300-Series (retired)
CPEC306
CPEC310

Related FAQs

Number of FAQs related to 27423: 5

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  1. To use the CPEC200 scrub module as a source of zero gas, is it necessary for the CPEC200 system to include a valve module?

    Yes. For more information, refer to the "CPEC200 Scrub Module Installation, Operation and Maintenance" appendix in the CPEC200 Closed-Path Eddy-Covariance System Instruction Manual.

  2. Why did Campbell Scientific start using molecular sieve? Does it have the same effect as the previously used chemicals?

    The molecular sieve has been demonstrated here by our engineering department to be effective at removing CO2 and H2O from the air sample. The change was made for two reasons:

    1. It was a safer alternative than using the previous chemicals.
    2. Increased shipping regulations for the chemicals limited the number of suppliers. 
  3. Which countries can the molecular sieve be shipped to?

    The molecular sieve is a non-hazardous material that can be shipped to any country.

  4. Can molecular sieve be used in the future to replace bottles for gas analyzers sold before July 2017?

    The molecular sieve is a direct replacement for the old magnesium perchlorate bottles. The molecular sieve may be used for any Campbell Scientific analyzer that used the old bottles.

  5. To prepare the molecular sieve, how many grams are needed per bottle?

    The bottles of sieve for drop-in replacement contain the pellets and a membrane on top. The membrane is necessary to keep the pellets contained while allowing gas to pass over the zeolite. The bottle has the same footprint as the old magnesium perchlorate bottles. The amount in each bottle is listed on the bottle. The amount of sieve needed for each analyzer is the following:

    • The EC150 needs 22 g (drop-in bottle).
    • The IRGASON® needs 22 g (drop-in bottle).
    • The EC155 needs 22 g (drop-in bottle).
    • The AP200 needs 500 g (refill).
    • The 27423 needs 1000 g (refill).
    • The 31022 needs 500 g (refill).
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