EQUATION 23
where:
Tind,filter = mean filter temperature indicated by the test sampler, °C; and
Tref,filter = mean filter temperature measured by the reference temperature sensor, °C.
EQUATION 24
where:
Tind,ambient = mean ambient air temperature indicated by the test sampler, °C; and
Tref,ambient = mean ambient air temperature measured by the reference ambient air temperature recorder, °C.
EQUATION 25
40 C.F.R. §53.57