Controls and Settings
The principle control during operation is the rotary switch; this allows the user to select the
following operations
In ‘automatic’ mode the instrument will continually monitor the suspended solids density and
will move the sensor up and down to track the sludge blanket interface. The motor up/down and
stop positions are self-explanatory and are only used during the setup of the instrument.
On the circuit board there are a number of other controls, the function of these controls is
explained in later sections:
Circuit Board Ident
Type of Control
Use
Zero
Push Button
Calibration
Top Limit
Potentiometer
Calibration
Bridge Clearance
Potentiometer
Scraper Clearance
Motor Speed Control
Potentiometer
Factory setup
20 mA Adjustment
Potentiometer
Factory setup
4 mA Adjustment
Potentiometer
Factory setup
100%
Potentiometer
Factory setup
0%
Potentiometer
Factory setup
Up
Push Button
Calibration and maintenance
Down
Push Button
Calibration and maintenance
Link A
Jumper
Setup
Link B
Jumper
Setup
Link C
Jumper
Setup
Link D
Jumper
Setup
Voltage Selector
Switch
Setup
Controls and Settings
Page 6
automatic
motor stop
motor up
motor down
