Desiccant Dryers

On-line and portable gas drying to <1 ppm[V]

Manalytical's range of Continuously Operating Desiccant Dryers (CODD) are intended to provide a constant flow of 'dry' Air or N2, certified by NPL to be drier than -75°C Dew point.

Incorporating either 2 or 4 columns, dependent on the required flow, these on-line dryers switch between duty and regeneration columns, thus ensuring that the desiccant is always in its best possible condition.

A Manalytical CODD offers the following advantages:

  • A constant supply of ‘dry’ gas is essential for the integrity of any process where the presence of moisture can be critical.
  • The performance of any hygrometer can be optimised, and the mean service interval extended, by purging with ‘dry’ gas when the instrument is not being used.
  • No user interface required – automatic regeneration of the desiccant.
  • The desiccant can aid in removing light contaminants from the gas, such as natural gas.
  • The provision of a ‘dry’ reference gas enables the operator to easily check the calibration of a portable trace moisture analyzer.

Product Specification

Column TypeStainless Steel, Desiccant Filled
Suitable GasesOil-free Air or N2. Dryers for other carrier gases (e.g.: Natural Gas, H2) upon request.
Maximum OutputUp to 100 litres / minute.
RegenerationAutomatic – by internal heating of the desiccant.
Regeneration FrequencyContinuous – the dryer automatically switched between duty and regeneration cycles.

For applications where a fixed installation dryer is not practical, Manalytical’s Bottled Gas Dryer (BGD) offers a portable ‘dry’ gas source, also certified to <-75°C Dewpoint. Featuring a single column, the BGD has no day-to-day power requirement and is therefore an ideal tool for work in hazardous areas.

Offering the same advantages as a CODD, it is recommended that clients always use a BGD on portable moisture analysis applications, where contamination in the gas stream may degrade the performance of the Sensor (e.g.: petrochemical applications). A BGD offers an extremely cost-effective method of checking for contamination and drift of the instrument's 'zero' point.

Product Specification

Column TypeStainless Steel, Desiccant Filled
Suitable GasesOil-free Air or N2, Dryers for other carrier gases (e.g.: Natural Gas, H2) upon request.
Maximum Output25 litres / minute
RegenerationManual – by heat and reversal of flow in a designated Safe Area.
Regeneration FrequencyDependent on usage and moisture loading in the carrier gas. Please ask for further details.

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