100 MM GRAPHICS RECORDER: USER GUIDE
HA027271
Issue 12 Mar 04
User Guide
Page 50
4.3.3 CHANNEL/ALARM CONFIGURATION (Cont.)
RANGE LOW
Enter the lowest value of the required linearisation range (e.g. 100)
RANGE HIGH
Enter the highest value of the required linearisation range (e.g. 200)
RANGE UNITS
Selectable from degrees Celsius, degrees Fahrenheit, Kelvin or Rankine.
SCALED
This box allows the user to select low and high values and units for a scale.
SCALE LOW
Enter the scale value to correspond with input range low (e.g. 0).
SCALE HIGH
Enter the scale value to correspond with input range high (e.g. 100).
SCALE UNITS
Enter up to five characters of unit descriptor (% RH for example).
Note:
User lineariation table units.
The Range Units selection box can be used to set user linearisation table units to temperature units (˚C for
example).
To enter custom units instead, 'Scaled' must be selected. Scale low and scale high must be set to range low
and range high respectively. The required units string is then enterd in the Scale Units text entry box.
OFFSET
Allows a fixed value to be added to or subtracted from the process variable. Recorder accuracy figures no longer
apply if an offset is included.
SCALE TYPE
This field allows 'None', 'Linear' or (if the Log Scales option is fitted), 'Log' to be selected as scale type. For linear
scales, the number ofmajor/minor scale divisions can be selected. This does not affect the 'chart' grid divisions, which
is set up as a part of Group configuration (
).
NONE
Channels with Scale Type selected to 'None', appear with no scale information in any display mode.
LINEAR
Channels with Scale Type = Linear, appear with scale information in all display modes (except numeric). The number
of major and minor divisions can be selected from subsequent fields. Examples are shown in figure 4.3.3b, above.
LOG
This menu item appears only if the Log Scales option is fitted.
Channels with Scale Type = Log, appear with logarithmic scales. These scales have major divisions at each decade
boundary, and (space permitting), minor divisions for mantissa values 2 to 9. Examples are shown in figure 4.3.3b,
below. Because of the nature of logarithms, neither negative values nor the value 0 can be used as scale 'zero'.
