User's Manual

18
• The alarm is also activated if one or both of the independent
maximum dosage times are exceeded. The
maximum time that the relay contacts remain
active continuously (max. dosage time) can be
set from 1 to 10 minutes for HI 9913 and
HI 9935 and 1 to 90 minutes for HI 9923.
• Once in an alarm condition, the contact remains activated until
the switch is put in the manual position or the measurements
return to normal values.
TEMPERATURE COMPENSATION
Temperature affects conductivity and TDS measurements considerably
(approx. 2% per degree Celsius). You however do not need to worry
about having to compensate for this or go through complicated
calculations since all three probes recommended in this manual
(HI 7638, HI 3002 and HI 3001D) compensate for the temperature
effect automatically.
MAIN POWER SUPPLY CONNECTION
•
BeforeBefore
BeforeBefore
Before
connecting the unit to the mains connecting the unit to the mains
connecting the unit to the mains connecting the unit to the mains
connecting the unit to the mains, make sure
that the
controller is completely wiredcontroller is completely wired
controller is completely wiredcontroller is completely wired
controller is completely wired and that all
connections for pump, alarm, probe, etc. have been made.
• For 220-240V, short the L1 and N1 termi-
nals. Then wire the external power supply
to the three terminals as shown.
• For 110-115V, short the L and L1 termi-
nals and the N1 and Neutral. Then wire
the external power supply to the three
terminals as shown.
• Replace the cover with the gasket and
screw it tight with the 4 screws provided. Only then connect the
controller to the mains.
ALARM DOSING TIME
MINUTES
1
10
2.5
5
7.5
Neutral
Line
POWER
SUPPLY
220 VAC
Configuration
L
L1
N1
Neutral
Line
POWER
SUPPLY
L
L1
N1
110 VAC
Configuration
110 VAC
Configuration