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7ML19985GG03
Pointek CLS500 – INSTRUCTION MANUAL
Page 99
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Appendix E
2. Setting dry run (underfill) protection
Delta Range Setting can be used to set a Lower Range Value in applications where it is
difficult or impossible to lower the product to that level. In this case you take the actual
value for the lowest normal process level as Upper Range Value (URV), and apply Delta
Range setting. This subtracts the minimum span from URV, and updates LRV.
Example: Under normal process conditions the level never drops below the product exit
opening:
• It is impossible to lower the level enough to take the actual value for LRV.
• Switching must be guaranteed.
Set 2-state signalling and Lower Range Value to ensure the level never drops below the
product exit opening.
Device settings:
Reset to factory settings ......................................................................Menu 12 reads FAC A
TV0 selected: Transmitter Variable 0 is PV .......................................Menu 01 readsPv = 0
Select 2-state mode: C: Lo (4 mA in normal conditions)................Menu 07 reads C: Lo
1
Upper Range Value (100% of range) is set to 26.6
2
........................Menu 0F reads 26.60 pF
Apply Delta Range Settings (press both buttons) ..........................Menu 0D reads 3.3 pF
Check Lower Range Value (0% of range) .........................................Menu 0E reads 23.30 pF
Under normal process conditions (level to be at or above URV) the output will be 4 mA.
With 2-state signalling enabled and C: Lo selected, the signal will switch to 20 mA in an
alarm situation, whenever the level falls to LRV.
1.
C: Lo appears while the button is pressed: when the button is released the
display will show 4 mA as long as the level is above LRV.
2.
When the product is at the lowest level under normal conditions, press both
buttons at menu OF to take the environmental initial capacitance value as URV
(100%). (Values shown are for demonstration purposes only.)
product entry
product exit
menu 0F URV 100% 26.6 pF Lowest level under
normal circumstances
23.3 pF
updated LRV
1
after Delta Range setting applied