Priming The Pump - Hanna Instruments Groline HI981412 Instruction Manual

Hi control mode on the HI981412
Pump status
Hysteresis
Proportional Control
With Proportional control enabled in SETUP, the dosing time depends on the difference between pH
value and assigned set point.
Proportional Control
with Hi Control Mode and Band as illustrated
time
proportional mode
with 0.25L/h
0.25L/h
15%
An overview of pH proportional control is presented in the graph below.

8.2. PRIMING THE PUMP

• From measurement mode, long press the arrow keys together to manually activate the pump.
• To exit, release the two keys.
• When there are no errors or active alarm, the LCD backlight is yellow.
28
On/O Control
Pump running continuously
at the con gured ow rate
RUNNING
NOT RUNNING
Set
Measured
point
value
Regulator
output
Flow rate
100%
Set value
Band
Set
Measured
point
value
speed proportional
ow rate
0.25L/h SETUP
0.3÷3.5L/h
90%
50%
Lo control mode on the HI981412
Pump running continuously
Pump status
at the con gured ow rate
RUNNING
NOT RUNNING
Set
point
Proportional Control
with Lo Control Mode and Band as illustrated
Regulator
output
Flow rate
100%
Set value
Band
Set
point
speed proportional
ow rate
0.25L/h SETUP
3.5÷0.3L/h
0.25L/h
90%
50%
Hysteresis
Measured
value
time
proportional mode
with 0.25L/h
Measured
value
15%
0.1