Hanna Instruments HI 9931 - Manual (Page 15)

15
MAIN POWER SUPPLY CONNECTION
• Before Before Before Before 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 wired controller is completely wired controller is completely wired controller 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.
Neutral
Line
POWER
SUPPLY
220 VAC
Configuration
L
L1
N1
Neutral
Line
POWER
SUPPLY
L
L1
N1
110 VAC
Configuration
110 VAC
Configuration
Make sure that the controller has been properly calibrated before
commencing and that the conductivity/TDS setpoint has been ad-
justed (see following pages).
The conductivity/TDS probe must be properly connected and wired to
the controller (see preceding pages).
The protective sleeve must not be removed and the holes on the sleeve
should be near the top (the cable end). The probe must be immersed
in the solution above the air-vent holes on the external sleeve. The
probe must be installed in such a way as to minimize presence of air
bubbles (see probe installation tips at the end of the
manual).
Ensure that the selector (see 8 - Functional Diagram) is in
the “READ” mode.
The controller provides for a visual dosing status through
the “FERT FEED” LED (see 9 - Functional Diagram).
The actual conductivity (EC) or TDS value will be dis-
played on the LCD in mS/cm or ppm, respectively.
NORMAL OPERATION NORMAL OPERATION NORMAL OPERATION NORMAL OPERATION NORMAL OPERATION
& MEASUREMENT & MEASUREMENT & MEASUREMENT & MEASUREMENT & MEASUREMENT
FERT.
FEED
SET
READ
ppm
TDS
mS
EC 1240 1.20