Tolerance time - PR53 - PR53AC - PR53AP - PR53GC - PR53GP - PR53M - PR53SD - PR53W

PR53 Series User Guide

Document code
M212898EN
Revision
E
Language
English
Product
PR53
PR53AC
PR53AP
PR53GC
PR53GP
PR53M
PR53SD
PR53W
Document type
User guide

The tolerance time setting can be used in processes with intermittent breaks in the measurement due to non-representative sample on the prism. This typically occurs when there are large voids in the process liquid.

If the optical image can be interpreted, the tolerance time setting does not have any effect. When the optical image can no longer be interpreted (status messages, for example, No liquid detected.; No optical image.; Prism coating detected.), the measurement is held for the given number of seconds.

For example, a setting of 10 seconds ensures that any No liquid detected. state which is shorter than 10 s does not cause a dip into the output signal. The factory setting is 5 s. To see the tolerance time, go to Calibration > Outputs > Tolerance time.

The tolerance time counter is always reset when there is a representative sample on the prism (for example, the RI can be determined). The following figure shows this behavior with an intermittent measurement signal.

  • When the signal drop is shorter than the tolerance time (for example, at t = 10 s or t = 35 s in the figure), the output signal does not drop.
  • If the signal drop is so long that the tolerance time counter reaches zero, there is a drop in the output signal (at t = 80 s in the figure).
Figure 1. Effect of tolerance time on output