ASTM D3195-90(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D3195– 90(Reapproved 2004)
Standard Practice for
Rotameter Calibration
This standard is issued under the fixed designation D3195; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Practice
1.1 This practice covers the calibration of variable-area 4.1 Two alternative methods of performing the required
flowmeters (rotameters) used to determine air sample volumes volume determinations for rotameter calibration are described:
at or close to ambient conditions of pressure and temperature, 4.1.1 Using the water-sealed rotating drum meter (wet test
in the analysis of atmospheres for pollutant content. meter). See Section 7.
1.2 This standard does not purport to address all of the 4.1.2 Using the volumetric gasometer (bell prover). See
safety concerns, if any, associated with its use. It is the Section 8.
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.1 Choice of method depends primarily on which equip-
ment is available. Higher accuracy is possible with the gasom-
2. Referenced Documents
eter.Theaccuraciesofthemethodsofatmosphericanalysis,for
2.1 ASTM Standards: which the calibration procedure is intended, do not warrant the
D1071 Test Methods for Volumetric Measurement of Gas- very highest possible accuracy in flow measurement.
eous Fuel Samples
6. Apparatus
D1356 Terminology Relating to Sampling and Analysis of
Atmospheres 6.1 Wet Test Meter, or Volumetric Gasometer, with water
seal and equipped with a water manometer on the inlet.
D3631 Test Methods for Measuring Surface Atmospheric
Pressure 6.2 Counter Balance Weights, for gasometer.
6.3 Mercury Barometer—See Test Methods D3631.
E1 Specification for ASTM Liquid-in-Glass Thermometers
E337 Test Method for Measuring Humidity with a Psy- 6.4 Psychrometer, (if room air is used for calibration gas).
chrometer (the Measurement of Wet- and Dry-Bulb Tem- See Test Method E337.
6.5 Thermometer, to measure ambient temperature. See
peratures)
Specification E1.
3. Terminology
6.6 Stopwatch.
3.1 Definitions: 6.7 Air Supply, either a cylinder of compressed air or a
3.1.1 For definitions of terms used in this practice, refer to diaphragm type pump of adequate capacity and a ballast
Terminology D1356. volume or restrictor to eliminate pulsations.
3.1.2 standard conditions are taken as 25°C and 101.3 kPa 6.8 Needle Valve.
(760 mm Hg) at existing ambient humidity. This conforms to
7. Procedure Using Wet Test Meter
most of the ASTM methods for atmospheric sampling and
7.1 Unless it was already calibrated within the previous 3
analysisthatinvolvevolumetriccorrections.Absolutetempera-
ture scales are to be used when substituting values into the months, calibrate the wet test meter by Test Methods D1071.
The method described in Section 19 is recommended for
formulae used in this procedure.
highest accuracy.
1 7.2 Set up the apparatus as shown in Fig. 1, making
This practice is under the jurisdiction of ASTM Committee D22 on Sampling
and Analysis of Atmospheres and is the direct responsibility of Subcommittee connections as short as possible and large enough inside
D22.01 on Quality Control.
diameter to avoid any appreciable pressure drops.
CurrenteditionapprovedOctober1,2004.PublishedDecember2004.Originally
7.3 Before and after the complete calibration run, record
´1
approved in 1973. Last previous edition approved in 1998 as D3195 - 90 (1998) .
room temperature, barometric pressure in accordance withTest
DOI: 10.1520/D3195-90R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Methods D3631, and relative humidity (when room air is used
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
for calibrating gas) in accordance with Test Method E337. Use
Standards volume information, refer to the standard’s Document Summary page on
average values for subsequent calculations.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3195– 90 (2004)
FIG. 1 Calibration Assembly Using Wet Test Meter
7.4 Start air flowing through the rotameter and wet test connections as short as possible and large enough inside
meter.Adjust the flow to the desired rate with the needle valve.
diameter to avoid any appreciable pressure drops.
Take a pair of timed readings on the wet test meter, under
8.3 Before and after the complete calibration run, record the
steady flow, for each of five or more uniformly spaced points
room temperature, barometric pressure, and relative humidity
on the rotameter scale, going from low values to high values.
(when room air is used for calibrating gas). Use average values
Repeat, going from high to low. Note the manometer reading
for subsequent calculations.
and meter water temperature for each meter reading.
8.4 Start air flowing through the rotameter and into the
gasometer.Adjust the flow to the desired value with the needle
8. Procedure Using Gasometer
valve.
8.1 Unless it was already ca
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