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October 2020
4.4
Configuring the sensitivity
The level switch is factory-set to high sensitivity (setting B) and normally
does not need to be changed. However, if the bulk solids material has a
frequent tendency to cake or deposit, a switch on the PCB can be changed to
setting A to decrease the sensitivity of the fork sensor.
Figure 4-4
other modules have the same configuration switch and default setting.
Figure 4-4: Sensitivity Settings
A. Low sensitivity setting A (switch position up)
B. High sensitivity setting B (switch position down) - factory default
C. Electronics PCB for the SPDT relay option
Table 4-1: Approximate minimum bulk density on setting
Rosemount 2521S
(standard sensitivity)
Rosemount 2521H
(high sensitivity, option V1)
Rosemount 2521H
(enhanced sensitivity, option V2 or V3
(1)
Sensitivity option V3 is more sensitive than option V2 by having an increased
surface area on the fork.
For measurement of solids in water using a Rosemount 2521S, setting A is
recommended. Sensitivity adjustments to the electronics can also be made
using the potentiometer.
Quick Start Guide
shows the SPDT relay electronics module as an example. The
C
A
B
Setting A
Low sensitivity
3
9 lb/ft
(150 g/l)
3
4.5 lb/ft
(75 g/l)
3
1.2 lb/ft
(20 g/l)
(1)
)
Quick Start Guide
Setting B
High sensitivity
3
3 lb/ft
(50 g/l)
3
1.2 lb/ft
(20 g/l)
3
0.3 lb/ft
(5 g/l)
27
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