User's Manual

16
CONDUCTIVITY/TDS PROBE CONNECTION
• Attach the conductivity/TDS probe (HI 3002, HI 3001D or
HI 7638) to the DIN socket located on the bottom of the casing.
Align the guide on the connector with the socket, push the
connector in and tighten the retainer ring. (HI 3002 is more
suitable for direct immersion in the tank, vat or pipes. HI 3001D
can be mounted directly into a pipe and HI 7638 is recom-
mended for high temperature and pressure applications).
• The probes incorporate a temperature sensor and the controller’s
circuitry automatically compensates for the temperature effect.
RELAY CONNECTIONS
• The controllers provide for two separate relays, one for pH and
another for Conductivity (or TDS).
• Wire the external devices (pumps or electrovalves) directly to the
relay terminal strips of the controller (see 21 and 22 - Functional
Diagram). The
terminals are poweredterminals are powered
terminals are poweredterminals are powered
terminals are powered and hence you
do do
do do
do
not need an external power supplynot need an external power supply
not need an external power supplynot need an external power supply
not need an external power supply for the pumps or
electrovalves.
• The relay for the pH is activated when pH exceeds the setpoint
(HI 9913 and HI 9935) or falls below the setpoint (HI 9923).
The relay for conductivity/TDS instead acts in the opposite direc-
tion, i.e. it is
activated when
the conductivity
(or TDS) falls be-
low the setpoint
(HI 9913 and
HI 9935) or ex-
ceeds the setpoint
(HI 9923).
ALARM CONNECTIONS
• The operator can select an alarm threshold of 0.0 to 2.0 pH by
turning the alarm knob (see 17 - Functional Diagram). If the pH
measurements fall below the setpoint (HI 9913 and HI 9935) or
are above the setpoint (HI 9923) by a margin greater than the
user-selectable alarm threshold, the alarm terminal is activated.
pH
0
1
2
0
1
2
mS
ALARM
pH
0
SECONDS
mS
2.0 0
TIMER
MINUTES
90
PROPORTIONAL SETTINGS
47
0
SECONDS
pH
2.0
0
TIMER
MINUTES
90
PROPORTIONAL SETTINGS
14
SLOPE CAL
ALARM
ON
OFF
0.5 1.5
SET
FERT
mS
OFFSET SLOPE
ALARM
ON
OFF
0.5 1.5
SET
ACID
ALARM
HI 9913
1
10
2.5
5
7.5
1
10
2.5
5
7.5
ALARM
pH
5
6
EC
mS
FEED
FEED
2
3
SET pH
SET EC
ALARM
LINE
ACID
ALK
ZERO CAL
BL DOSING
PUMPS