Emerson Rosemount 2521 Series, Быстрый старт

Страница: 27 / 36

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 shows the SPDT relay electronics module as an example. The
other modules have the same configuration switch and default setting.
Figure 4-4: Sensitivity Settings
C
A
B
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
Setting A
Low sensitivity Setting B
High sensitivity
Rosemount 2521S
(standard sensitivity) 9 lb/ft
3
(150 g/l) 3 lb/ft
3
(50 g/l)
Rosemount 2521H
(high sensitivity, option V1) 4.5 lb/ft
3
(75 g/l) 1.2 lb/ft
3
(20 g/l)
Rosemount 2521H
(enhanced sensitivity, option V2 or V3
(1)
)
1.2 lb/ft
3
(20 g/l) 0.3 lb/ft
3
(5 g/l)
(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.
October 2020 Quick Start Guide
Quick Start Guide 27