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| All equipment shall be inspected for compliance with appropriate dimension s, as stated in each standard, as well as to determine if it is in satisfactory operation condition (i.e. clean, tight and serviceable). Inspection shall occur at least annually, or whenever there is reason to suspect nonconformance with the standard. |
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| Item | Vacuum Apparatus | |
| Description | Types A - F; capable of withstanding the full vacuum applied | |
| Hose openings covered with a small piece of wire mesh | ||
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Type A:
| Glass, plastic, or metal bowl with approx. 2000 mL capacity | |
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Type B:
| Thick-walled filter flask or vacuum dessicator with approx. 2000 mL capacity | |
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Note:
| Types A and B are for weighing in air and in water | |
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Type C:
| Approx. 2000 mL volumetric flask | |
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Type D:
| Approx. 4000 mL heavy-wall glass pycnometer | |
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Type E:
| Approx. 4500 mL metal vacuum pycnometer with a clear poly-(methyl methacrylate) PMMA lid | |
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Type F:
| Approx. 10000 mL plastic pycnometer | |
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Note:
| Types C - F are for weighing in air only | |
| Calibration Item | Check Physical Condition | |
| Calibration Procedure | AASHTO T 209 Section 8 | |
| Calibration Interval | 12 months | |
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| Item | Balance | |
| Description | Readable to 0.1% of sample mass or better with weigh-below capability | |
| Calibration Item | Verify mass readings | |
| Calibration Procedure | AASHTO M 231 | |
| Calibration Interval | 12 months | |
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| Item | Vacuum Pump or Water Aspirator | |
| Description | Capable of evacuating air from the vacuum container to a residual pressure of 4.0 kPa | |
| Calibration Item | Verify proper operation | |
| Calibration Procedure | Measure pressure | |
| Calibration Interval | 12 months | |
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| Item | Residual Pressure Manometer OR NIST traceable vacuum gauge | |
| Description | Capable of measuring residual pressure down to 4.0 kPa | |
| Calibration Item | Verify pressure readings | |
| Calibration Procedure | Refer to manufacturer's instructions | |
| Calibration Interval | 12 months | |
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| Item | Manometer or vacuum gauge | |
| Description | Suitable for measuring pressure at source of vacuum | |
| Calibration Item | Verify pressure readings | |
| Calibration Procedure | Refer to manufacturer's instructions | |
| Calibration Interval | 12 months | |
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| Item | Thermometer | |
| Description | Maximum scale error of 0.5 C | |
| Calibration Item | Verify temperature readings | |
| Calibration Procedure | ASTM E 1, ASTM E 77 | |
| Calibration Interval | 6 months | |
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| Item | Water Bath | |
| Description | Maintained at a constant temperature of 25 ± 1 C and with a constant water level | |
| Calibration Item | Verify temperature; check water level | |
| Calibration Procedure | Verify with calibrated thermometer | |
| Calibration Interval | Daily or Prior to Use | |
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| Item | Suspension Apparatus (if using weigh-in-water technique) | |
| Description | Wire suspending container should be of smallest practical size | |
| Water level must completely cover the container | ||
| Calibration Item | Check Physical Condition | |
| Calibration Procedure | Visual | |
| Calibration Interval | 12 months | |
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| Item | Bleeder Valve | |
| Description | Attached to vacuum train for vacuum adjustment | |
| Calibration Item | Check condition | |
| Calibration Procedure | Verify operation | |
| Calibration Interval | 12 months | |
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| Item | Incidental equipment | |
| Description | Pans, agitation device, timer, gloves, etc. | |
| Calibration Item | Check condition | |
| Calibration Procedure | Visual | |
| Calibration Interval | 12 months | |
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| Reference the following specifications | ||
| AASHTO T 168 | Standard Practice for Sampling Bituminous Paving Mixtures | |
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