Dynacal® Permeation Tubes and Devices from VICI Metronics

permeation tubes
  • Ideal for lab environments
  • Smaller than G-Cal devices
  • More accurate than G-Cal devices
  • Require a temperature-controlled environment
  • Inexpensive calibration solution

Dynacal perm tubes and wafer permeation devices are small, inert capsules containing a pure chemical compound in a two phase equilibrium between its gas phase and its liquid or solid phase. At a constant temperature, the device emits the compound through its permeable portion at a constant rate.

Perm tubes are wafer devices are typically inserted into a carrier flow to generate test atmospheres for calibrating gas analyzer systems, testing hazardous gas alarms, or conducting long-term studies of effects on materials or biological systems – in short, any situation requiring a stable concentration of a specific trace chemical.

This is just a sample of what we offer. If you need something not on this list, contact Metronics.

Chemical name CAS
Acetaldehyde 75-07-0
Acetone 67-64-1
Ammonia 7664-41-7
Benzene 71-43-2
Carbon Disulfide 75-15-0
Carbonyl Sulfide 463-58-1
Chlorine 7782-50-5
Decane 124-18-5
Dichloromethane 75-09-2
Dimethyl Disulfide 624-92-0
Dimethyl Sulfide 75-18-3
Ethyl Mercaptan 75-08-1
Ethylene Oxide 75-21-8
Formaldehyde (para) 30525-89-4
Hydrogen Sulfide 7783-06-4
Hydrochloric acid(20.2%) 7647-01-0
Hydrogen Chloride 7647-01-0
Hydrogen Cyanide 74-90-8
Mercury 7439-97-6
Methyl Mercaptan 74-93-1
Nitrogen Dioxide 10102-44-0
n-Pentane 109-66-0
Sulfur Dioxide 7446-09-5
Toluene 108-88-3
Water 7732-18-5

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Perm tube

permeation tubes

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The perm tube, a sealed permeable cylinder containing the desired permeant reference material, is the most widely used of the various permeation devices. Release of the chemical occurs by permeation through the walls of the PTFE tube for the entire length between the impermeable plugs. A wide range of rates can be achieved by varying the length and thickness of the tube, with typical rates ranging from 5 ng/min to 50,000 ng/min.

Extended life perm tube

permeation tubes

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Our unique extended life (XLT) perm tube is essentially a perm tube coupled to an impermeable stainless steel reservoir. This design offers a range of permeation rates corresponding to a standard perm tube, but has a significantly enhanced lifetime – by a factor of 3 for a 5 cm (active length) device or a factor of 12 for a 1 cm device.

Wafer device

permeation tubes

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Wafer devices have only a small permeable window, or wafer, so permeation rates are typically lower than rates for perm tubes. Since permeation occurs only through the polymeric wafer, the permeation rate is controlled by varying the wafer material, the thickness of the wafer, and the diameter of the permeation opening. Gases whose high vapor pressure at normal permeation temperatures prevent their containment in a tubular device can be contained in a wafer device. Wafer devices are available in different styles to allow use in calibrators made by various manufacturers.

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