Troubleshooting guide

108
Reference Manual
00809-0100-4308, Rev BA
Appendix A: Reference Data
December 2014
Reference Data
A.2.3 Accuracy over measuring range
The measuring range depends on probe type, dielectric constant of the product and installation
environment, and is limited by the Blind Zones at the very top and bottom of the probe. In the
Blind Zones, the accuracy exceeds ±1.18 in. (30 mm), and measurements may not be possible.
Measurements close to the Blind Zones will have reduced accuracy.
The following conditions will impact the Blind Zones:
 If the single lead probes or flexible twin lead probes are installed in a nozzle, the nozzle
height shall be added to the specified Upper Blind Zone.
 The measuring range for the PTFE covered Flexible Single Lead probe includes the
weight when measuring on a high dielectric media.
 When using a metallic centering disc, the Lower Blind Zone is 8 in. (20 cm), including
weight if applicable. When using a PTFE centering disc, the Lower Blind Zone is not
affected.
Figure A-4, Figure A-5, and Figure A-6 illustrate the accuracy over measuring range at reference
condition using the Trim Near Zone function, with alternating probe types and varying dielectric
constant of the product.
Figure A-4. Accuracy over Measuring Range for Single Lead Probes
±0.25 in.
(6 mm)
3.2 in. (8 cm)
9.8 in. (25 cm)
±1.18 in.
(30 mm)
±0.25 in.
(6 mm)
4.3 in. (11 cm)
10.6 in. (27 cm)
2 in. (5 cm)
4.3 in. (11 cm)
±1.18 in.
(30 mm)
5.1 in. (13 cm)
Blind Zone
Water (DC = 80) Oil (DC = 2)