ChemicalFormulas - X4.1 When an electronic or other sensor without an emergent stem error is used, the output of this sensor or the associated data system should emulate the output of a mercuryin-glass thermometer. Based on information supplied by four manufacturers of automated Test Method D 86 equipment, the averaged equations shown in X4.2 and X4.3 have been reported to be in use.
X4.1.1 The equations shown in X4.2 have limited applicability and are shown for information purposes only. In addition to the correction for the emergent stem, the electronic sensor and associated data system will also have to emulate the lag in response time observed for mercury-in-glass thermometers.
X4.2 When a low range thermometer would have been used, no stem correction is to be applied below 20°C. Above this temperature, the correction is calculated using the following formula :
ASTM 7CT_elr = Tt - 0.000162 x (Tt - 20°C)^2 ---(X4.1)
X4.3 When a high range thermometer would have been used, no stem correction is to be applied below 35°C. Above this temperature the correction is calculated using the following formula :
ASTM 8CT_ehr = Tt - 0.000131 x (Tt - 35°C)^2 ---(X4.2)
where:
T_elr = emulated temperature in °C for low range thermometers,
T_ehr = emulated temperature in °C for high range thermometers, and
Tt = true temperature in °C.
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