Calibrating Instruments UNIT OVERVIEW Instruments used by the air-conditioning a

Question

Calibrating Instruments UNIT OVERVIEW Instruments used by the air-conditioning and refrig eration technician must be accurate and reliable should be checked periodically to ensure that they pump. The voltage nared with high-quality bench provide accurate readings. chart and cylinders with clean, fresh refrigerant. Vacuum . Theyauges and instruments can be checked using a vacuum Temperature-measuring instruments test equipment can be compared with high quality bench with known temperatures such as ice and water, boil ing water, and body temperature. Pressure be checked using the temperature/pressure relationship tained as recommended by the manufacturer can be checked meters. The ohmmeter can be used to read the resistance of several high-quality resistors at various resistance gauges can ranges. Flue-gas analysis instruments slbould be main KEY TERMS Calibration or calibrate Electrical test instruments Flue-Gas analysis instruments Pressure test instruments Temperature-measuring instruments (thermometer) REVIEW TEST Name Date Grade Circle the letter that indicates the correct answver 1. Three commonly used reference points for check- 3. To check the temperature leads of an electronic thermometer for high temperatures, they should be ing temperature-measuring instruments are A. 0PF 100°F, 110°F B. -460°F, 0°F 32°F C. 32 E, 98.6°F, 212 F D. 32°F, 100°F, 250 F. A. placed on the bottom of a pan of boiling water B. suspended in a pan of boiling water. C. suspended in the vapor just above a pan of boiling water 2. To check the temperature leads of an electronic D. suspended in a pan of boiling water when thermometer for low temperatures, they should be stirred in a container of A. crushed ice and water with half a teaspoon above sea level at least 1000 ft. of salt. B. crushed ice and water with a pinch of sugar C. crushed ice and pure water D. cubed ice and water 2017 Cengage Learning. All Righs Reserved. May not be scanned, copied or duplicated, or pasted to a poblidly accessible website, in whole or in part. 107

Explanation / Answer

1-14 halide torch uses copper element.

so option A is correct.

other option are wrong as they get corroded with halocarbon gases.

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