Commissioning
Micropilot NMR84
72
Hauser
9.4.10 Tank calculation: Thermal tank shell correction (CTSh)
CTSh (correction for the thermal expansion of the tank shell) compensates for effects on
the Gauge Reference Height (GRH) and on the expansion or contraction of the measuring
wire due to temperature effects on the tank shell or stilling well. The temperature effects
are separated into two parts, respectively affecting the 'dry' and 'wetted' part of the tank
shell or stilling well. The correction function is based on thermal expansion coefficients of
steel and insulation factors for both the 'dry' and 'wet' parts of the wire and the tank shell.
The temperatures used for the correction can be selected from on manual or measured
values.
This correction is recommended for the following situations:
• if the operating temperature deviates considederably from the temperature during
calibration (ΔT > 10 °C (18 °F))
• for extremely high tanks
• for refrigerated, cryogenic or heated applications
As the use of this correction will influence the innage level reading, it is
recommended to ensure the manual hand dip and level verification procedures are
being conducted correctly before enabling this correction method.
This mode cannot be used in conjunction with HTG because the level is not measured
relative to the gauge reference height with HTG.
Содержание Micropilot NMR84
Страница 177: ...Micropilot NMR84 Operating menu Endress Hauser 177 Additional information Read access Operator Write access Maintenance ...
Страница 204: ...Operating menu Micropilot NMR84 204 Endress Hauser Additional information Read access Operator Write access Maintenance ...
Страница 219: ...Micropilot NMR84 Operating menu Endress Hauser 219 Additional information Read access Operator Write access Maintenance ...
Страница 238: ...Operating menu Micropilot NMR84 238 Endress Hauser Read access Operator Write access Maintenance ...
Страница 255: ......
Страница 256: ...www addresses endress com 71545626 71545626 ...