ASTM D3195-90(1998)e1

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Designation:D3195 – 90(Reapproved 1998)
Standard Practice for
Rotameter Calibration
This standard is issued under the fixed designation D 3195; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Paragraph X1.5 was corrected editorially in October 1998.
1. Scope ture scales are to be used when substituting values into the
formulae used in this procedure.
1.1 This practice covers the calibration of variable-area
flowmeters (rotameters) used to determine air sample volumes
4. Summary of Practice
at or close to ambient conditions of pressure and temperature,
4.1 Two alternative methods of performing the required
in the analysis of atmospheres for pollutant content.
volume determinations for rotameter calibration are described:
1.2 This standard does not purport to address all of the
4.1.1 Using the water-sealed rotating drum meter (wet test
safety concerns, if any, associated with its use. It is the
meter). See Section 7.
responsibility of the user of this standard to establish appro-
4.1.2 Using the volumetric gasometer (bell prover). See
priate safety and health practices and determine the applica-
Section 8.
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 Choice of method depends primarily on which equip-
2.1 ASTM Standards:
ment is available. Higher accuracy is possible with the gasom-
D 1071 Test Methods for Volumetric Measurement of Gas-
eter.Theaccuraciesofthemethodsofatmosphericanalysis,for
eous Fuel Samples
which the calibration procedure is intended, do not warrant the
D 1356 Terminology Relating to Sampling and Analysis of
very highest possible accuracy in flow measurement.
Atmospheres
D 3631 Test Methods for Measuring Surface Atmospheric
6. Apparatus
Pressure
6.1 Wet Test Meter, or Volumetric Gasometer, with water
E 1 Specification for ASTM Thermometers
seal and equipped with a water manometer on the inlet.
E 337 Test Method for Measuring Humidity with a Psy-
6.2 Counter Balance Weights, for gasometer.
chrometer (the Measurement of Wet- and Dry-Bulb Tem-
3 6.3 Mercury Barometer—See Test Methods D 3631.
peratures)
6.4 Psychrometer, (if room air is used for calibration gas).
3. Terminology See Test Method E 337.
6.5 Thermometer, to measure ambient temperature. See
3.1 Definitions:
Specification E 1.
3.1.1 For definitions of terms used in this practice, refer to
6.6 Stopwatch.
Terminology D 1356.
6.7 Air Supply, either a cylinder of compressed air or a
3.1.2 standard conditions are taken as 25°C and 101.3 kPa
diaphragm type pump of adequate capacity and a ballast
(760 mm Hg) at existing ambient humidity. This conforms to
volume or restrictor to eliminate pulsations.
most of the ASTM methods for atmospheric sampling and
6.8 Needle Valve.
analysisthatinvolvevolumetriccorrections.Absolutetempera-
7. Procedure Using Wet Test Meter
7.1 Unless it was already calibrated within the previous 3
This practice is under the jurisdiction of ASTM Committee D22 on Sampling
months, calibrate the wet test meter by Test Methods D 1071.
and Analysis of Atmospheres and is the direct responsibility of Subcommittee
The method described in Section 19 is recommended for
D22.01 on Quality Control.
Current edition approved Dec. 28, 1990. Published February 1991. Originally
highest accuracy.
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published as D 3195 – 73. Last previous edition D 3195 – 73 (1985) .
7.2 Set up the apparatus as shown in Fig. 1, making
Annual Book of ASTM Standards, Vol 05.05.
3 connections as short as possible and large enough inside
Annual Book of ASTM Standards, Vol 11.03.
Annual Book of ASTM Standards, Vol 14.03. diameter to avoid any appreciable pressure drops.
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D3195 – 90 (1998)
FIG. 1 Calibration Assembly Using Wet Test Meter
7.3 Before and after the complete calibration run, record 8. Procedure Using Gasometer
room temperature, barometric pressure in accordance withTest
8.1 Unless it was already calibrated within the previous six
Methods D 3631, and relative humidity (when room air is used
months, in the same location, calibrate the gasometer by Test
forcalibratinggas)inaccordancewithTestMethodE 337.Use
Methods D 1071.
average values for subsequent calculations.
8.2 Set up the apparatus as shown in Fig. 2, making
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
steady flow, for each of five or more uniformly spaced points 8.3 Before and after the complete calibration run, record the
room temperature, barometric pressure, and relative humidity
on the rotameter scale, going from low values to high values.
Repeat, going from high to low. Note the manometer reading (when room air is used for calibrating gas). Use average values
and meter water temperature for each meter reading. for subsequent calculations.
FIG
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