Eurotherm 6100, Руководство пользователя

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
Page 100 HA029324
Issue 11 Oct 14
4.3.11 FUNCTION (Cont.)
Copy Copies the value of a selected point to the maths channel being confi gured. Al-
lows extra alarms to be set up for the copied point.
Polynomial Provides a polynomial curve fi t for the specifi ed point, using up to 8 orders,
Fvalue This function calculates ‘equivalent time at sterilizing temperature’ for tempera-
tures above and below the sterilizing temperature. Fo (dry) and Fh (steam) steri-
lizing calculations can be carried out, by entering the correct constant. The value
can be held, using a ‘Disable’ job or set to zero (prior to the next run) using a
‘reset’ job. See
section 4.7 for a description of jobs. The function value is retained
during power off.
Switch Allows two channels (‘A’ and ‘B’) to be selected as alternative sources for the se-
lected maths channel to copy. The maths channel copies source ‘A’, unless a
‘Switch to B’ job is active on the maths channel. See
section 4.7 for Job descrip-
tions.
Linear Mass Flow This function calculates mass fl ow from linear-type transducer outputs.
Root Mass Flow This function calculates mass fl ow from square root-type transducer outputs.
Rolling Average This takes the average value of a single channel over a specifi ed number of read-
ings taken at a specifi ed interval. The function value is retained during power off.
MKT Mean Kinetic Temperature. A single calculation to simulate non-isothermal ef-
fects of variations in storage temperature.
10 to the power Output = 10 raised to the power of the selected input value.
Group Latched Minimum Outputs the minimum value reached by any of the points in a selected source
group since last reset. The function ignores points that are not producing valid
PV. A disable job stops the function reading its input. A reset job sets the func-
tion to the current minimum value within the group. Note that for proper opera-
tion, the maths function must be in a group which is not the source group. If this
is not the case, it will always see itself as the lowest valued point in the group, and
Reset operations will have no useful effect.
Group Latched Maximum As for Group Latched Minimum, above, but outputs the maximum value of the
source group.
Sample and Hold This function is initiated by a trigger job. At trigger time, the selected point value
is sampled, and its value at trigger time is output continuously by this function.
On reset, the PV becomes ‘No data’.
Square Root Outputs the square root of the value of the selected point.
High Select Allows two points to be selected as inputs. The output of the function is the value
of that input point which currently has the higher value.
Low Select Allows two points to be selected as inputs. The output of the function is the value
of that input point which currently has the lower value.
Saturated Steam Mass Flow Calculates mass fl ow in kg/s for saturated steam, using either the steam tempera-
ture (Celsius) or pressure (MPa) as appropriate to the process.
Saturated Steam Heat Flow Calculates the energy fl ow in kJ/s for saturated steam, using either the steam
temperature (Celsius) or pressure (MPa) as appropriate to the process.
Saturated Steam Heat Consumed
Calculates the heat consumed in kJ/s for saturated steam, using the inlet steam
temperature (Celsius) or pressure (MPa) (as appropriate to the process), and the
return (condensate) temperature.
Group MKT Calculates Mean Kinetic Temperature of a specifi ed group of channels