1. (d) Temperature test conditions for testing temperature compensating gas meters:

   1. (1) Ambient temperature. The ambient temperature test condition is the existing temperature that the gas meter is exposed to at the time of a meter test. With utility shop testing, the ambient temperature is the normal proving room temperature.
   2. (2) Average winter temperature. The average winter temperature test is an approved gas meter test condition that represents the average temperature environment that an outdoor gas meter is expected to be exposed to during the winter. This temperature is specified as 20°F for all utilities.

   3. (3) Extreme temperature. The extreme temperature test condition for winter and summer are specified gas meter test conditions of 0°F and 100°F, respectively.

      (e) Tests and inspections.

      All meter testing facilities shall be available for inspection, certification and reasonable use by the department staff.

(a) Minimum facilities.

Each utility shall have meter testing facilities that are adequately maintained, are provided with suitable equipment and kept in proper condition for testing gas meters and auxiliary devices, and include at least one bell prover with a capacity not under five cubic feet.

(b) Notification.

Each utility shall keep the department staff informed of the location of each test facility where its meters and accessories are tested, any change in the facility which may affect the accuracy of its testing, and the number, type, and the most recent certification date of each test-standard at that location.

(c) Temperature.

Each meter test location shall be maintained to minimize temperature fluctuations and assure temperature equilibrium between the room air, the testing equipment including the prover(s), the sealing medium in each bell prover and the air or other testing medium supplied to each bell prover and the meters under test. Any temperature variation shall be limited to 1°F or less between the items listed above.