ASTM E145 PDF

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Astm E145 Pdf

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complies with ASTM E NOTE, Forced Ventilation Oven Types. IIA and IIB. This “benchtop” chamber is self-contained and well suited for virtually any research. oxidation on various materials. It is designed for economical and superior performance and complies with ASTM E NOTE, Forced Ventilation Oven. Types IIA. astm.e Section(s): Standards Body: e ASTM E Standard Specification for Gravity-Convection and Forced- . ASTM E pdf.

NOTE 1Ovens are designed for maximum operating temperatures of about C, C, and C, the thermal insulation and cost of the oven being dependent on the maximum temperature required. The value of the time constant shall not exceed the maximum value given in Table 1 for the particular type of oven.

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Temperature Uniformity 4. Locate one thermocouple in each of the eight corners of the oven approximately 5 cm 2 in. A minimum length of 30 cm 12 in.

NOTE 2If calibrated thermocouples are not available, nine thermocouples made from the same spool of wire may be used provided they give the same value for temperature when placed adjacent to one another in the testing chamber at the temperature of test.

The metric equivalents of inch-pound units may be approximate. Types 2.

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Performance Requirements 3. Current edition approved Aug. Published October Originally published as E 59 T.

Last previous edition E 68 Record the temperatures of the nine thermocouples for a period of at least 24 h, and determine from the record the maximum deviation of each point from the desired temperatures.

NOTE 3Some ovens may require as much as 24 h to reach a steady state.

If a steady state does not exist, there is a drift in the temperature toward the steady-state condition. Time Constant 5. Prepare a standard specimen consisting of a smooth brass cylinder 9.

Suspend the specimen vertically within 25 mm 1 in. Place the free junction of the differential thermocouple in the air space of the chamber at least 75 mm 3 in. Published October Originally published as E 59 T.

Last previous edition E 68 Record the temperatures of the nine thermocouples for a period of at least 24 h, and determine from the record the maximum deviation of each point from the desired temperatures. NOTE 3Some ovens may require as much as 24 h to reach a steady state. If a steady state does not exist, there is a drift in the temperature toward the steady-state condition.

Time Constant 5. Prepare a standard specimen consisting of a smooth brass cylinder 9. Suspend the specimen vertically within 25 mm 1 in. Place the free junction of the differential thermocouple in the air space of the chamber at least 75 mm 3 in.

Then close the door and either record or measure the temperature differential every 10 s. Determine the time in seconds required for the temperature difference to decrease to one tenth of the original or maximum value for example, from C to 12C and consider this to be the time constant of the oven.

Rate of Ventilation Note 4 6. Connect a watt-hour meter, with the smallest division reading in 0. NOTE 4This method is only applicable to electrically heated ovens.

Methods are being developed by the committee for determining the rate of ventilation of ovens that are not electrically heated and for determining the uniformity of air-ow within the testing chamber. NOTE 5In forced-ventilation ovens, the space around the motor shaft where it enters the oven must be closed, but the fan speed must not be affected by the closure. Start and stop the test at corresponding points of the on-off heating cycle, that is, at the moment when the heaters are switched on by the thermostat.

The ambient room temperature measured at a point approximately 2 m 6 ft from the oven, approximately level with its base and at least 0.

Designation: E145 − 94 (Reapproved 2011)

Keywords 7.Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Select a representative of specimen, oven type and capacity, and other factors. Connect a watt-hour meter, with the smallest division reading in 0. Test Specimen provides a means of evaluating some of those factors.

Last previous edition E 68 Combine all the portions for the test or just upon removal from the oven. For mine water content on the basis of volume.

It is the 3.