Metronics Part Numbering

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Topics
Types of Dynacal® permeation devices
Wafer devices
Tubular devices
Diffusion vials
Part number format
3 Certification
Determining factor – breakdown for wafer device
Nine most common wafer devices
5 Permeant gas designation – page 1 2
6 Special device designation – page 1 2
7 Certification, special range or accuracy
Part number examples – 1 2 3
Special formulas – page 1 2 3
Estimate permeation rate at unknown temperature
Tolerance chart – page 1 2
Diffusion Vial part number format
Returns to this page
Perm Index
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What is a permeation tube? How does it work?
A permeation tube is a sealed permeable membrane containing solid, liquid or liquefiable gases that permeate through the walls of the membrane at a constant rate.
The device is maintained at a constant temperature to establish constant vapor pressure inside the device. This results in an equilibrium between liquid/solid and the vapor phase of the chemical compound. The vapor escapes through the walls of the permeable membrane at a constant rate as long as the set point temperature is maintained. A measured flow of an inert gas such as nitrogen, helium, argon etc. is passed through the permeation chamber where the device is housed to capture and mix with the vapor resulting in known volumetric concentration in ppm/ppb. By varying the dilution flow rate one is able to generate a wide range of concentrations using a single device.
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Wafer
Tubular
Wafer devices
A wafer device is a type of permeation device that uses a metal reservoir and a circular TFE or FEP permeable membrane
Wafer devices have an active length of 4.6 cm and an outer diameter of 1.6 cm
Designed to allow very low permeation rates
Available with or without certification
An example of a wafer type
30T4:
T TFE (Permeable membrane)
sixteenths of an inch
Tubular devices
Dynacal tubular devices are primarily made out of different types of PTFE permeable membranes of varying wall thickness. They are available in active lengths of 0.5 to 20 cm long.
Each device is custom sized to generate the required mass per unit time to match the concentration range requirements of a specific application.
Typical permeation rates range from 5 ng/min to 50,000 ng/min for a single device.
Available with or without certification.
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Diffusion vials
A diffusion vial is a Pyrex® reservoir attached to a Pyrex® stem having a fixed bore size. The reservoir is filled with the liquid or solid material of interest. When maintained at a constant temperature, the material establishes a two phase equilibrium between the solid/liquid and gas phase where the gas diffuses through the bore of the stem. By varying the stem length and the bore size, one is able to vary the permeation rate at a set point temperature.
®Pyrex is a registered trademark of Corning Glass
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How are part numbers determined?
There is a logical progression to each part number, once you understand the basic formula. Each number in the sequence represents a specific aspect of the device: for example, the type of tubing, the active length of the tube, or the chemical being used.
1XX – XXX – XXXX – XXXX – XXXX
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3. Certification (ref: Tech Note 1002)
4. Permeable area
Tubular: Active Length in mm (range: 0.5 cm to 20.0 cm) Wafer: Wall thickness (0.030 – 0.090”)
5. Chemical number (ref: Rate Table & Price Sheet)
6. Special device designation (may not apply to all devices)
7. Certification, special range or special accuracy
(i.e.: C, U or S)
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Dynacal®
The first digit of all Dynacal devices will be designated as “1”.
#1 in part number format
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3 Tubular Device Special
8 XLT Device Special
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Tube
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Tube
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Wafer Device numerical representation
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0 Uncertified
6 Tubular or Wafer ultra low range (5-19 ng/min)
7 Special temperatures, ranges, or accuracies
Note1: 1-6 represent certification at 30°C only.
Note2: Third digit remains 7 for all temperatures above 30°C
for all rates..
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(Formula: required rate/per cm rate)
5 - - Wafer device with “T” wafer
6 - - Wafer device with “F” wafer
7 - - Waver device with special wafer
- y - Wafer thickness (.0y”)
- - z Wafer diameter (z/16”)
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Determining Factor – Breakdown for Wafer Device
Each device is then represented in the part number by a three digit code.
#4 in part number format - specific
X X X
a Represents the type of tubing. 5 – TFE , 6- FEP
b Represents the wall thickness of the tube
(range of 3-9)
c Represents the diameter of the cap bore in 16th of an inch. (range of 3 or 4)
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Reference Technical Note 1002, Table 2
Part Number
1.0
533
0.60
543
0.40
553
0.23
633
0.14
643
0.11
653
0.07
663
0.05
693
0.03
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#5 in part number format - Examples
Chemical or Gas Grouping
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Tube Type
Tube Designation
STD #10
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Wafer Device
Special Designation
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C Certified followed by temperature in °C.
(i.e.: C30 or C45)
(i.e.: U30 or U50)
special accuracy
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with the rate of 5000 ng/min, certified at 35°C.
117-083-0082-C35
(customer request unit to be certified at a
temperature other than 30°C)
4. 083 Active tube length in mm (8.3 cm). Active length
is calculated using active length formula
5. 0082 Chemical compound designation for Sulfur
dioxide
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with the rate of 450 ng/min , certified at 30°C.
122-013-0082-F56-C30
3. 2 Tubular mid range (101-500 ng/min)
4. 013 Active tube length in mm (1.3 cm)
5. 0082 Sulfur dioxide numeric representation
6. F56 LE #2, Low Emission Tube
7. C30 Certified at 30°C
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4. 553 50T3 (.05” thick x 3/16” dia T wafer)
5. 0081 Nitrogen dioxide numeric representation
6. N/A for this part
7. C40 Certified at 40°C
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Special Formulas
Active Length (mm) = Required Rate (ng/min) /Per cm Rate (answer will be in cm)
Total Rate (ng/min) = Active Length x Per cm Rate
Tubular Devices
For rates:
Whichever is greater
20-100 ng/min Accuracy = Rate x 5% or +/- 2 ng/min
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P Permeation rate (ng/min)
C Concentration (ppm or ppb)
K Molar constant = 24.46/molecular wt. of compound
P = (F x C) / K
F = (P x K) / C
C = (P x K) / F
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log P1 = log P0 + α(T1-T0)
Log = Base 10
T1 = New temperature (ºC)
T0 = Known temperature (ºC)
α = Temperature coefficient
Note: Before exposing device to higher temperatures, end user must consult VICI Metronics to obtain information on maximum temperature settings.
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(cm) (+/-) (cm)
20 to 100 +/- 25%
5 to 19 +/- 50%
20 to 100 +/- 25%
5 to 19 +/- 50%
20 to 100 +/- 25%
5 to 19 +/- 50%
5 to 100 +/- 50%
20 to 100 +/- 20%
5 to 19 +/- 50%
(cm) (+/-) (cm)
20 to 100 +/- 20%
5 to 19 +/- 50%
20 to 100 +/- 25%
5 to 19 +/- 50%
20 to 100 +/- 25%
5 to 19 +/- 50%
Devices 5 to 19 +/- 50%
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1. 19 = Diffusion Vial

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Metronics Part Numbering