Hanna-instruments HI 9910 Manual de usuario Pagina 16

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16
RELAY CONNECTIONS
Wire the external device or devices (pumps or electrovalves)
directly to the relay terminal strip of the controller (see 20 -
Functional Diagram). The
terminals are poweredterminals are powered
terminals are poweredterminals are powered
terminals are powered and hence
you
do not need an external power supplydo not need an external power supply
do not need an external power supplydo not need an external power supply
do not need an external power supply for the pump
or electrovalve. There is one terminal strip for HI 9910 and
HI 9920 and two for HI 9911.
ALARM CONNECTIONS
The operator can select an alarm threshold of 0.0
to 2.0 pH for HI 9910 and HI 9911 or 0 to 200
mV for HI 9920 by turning the alarm knob (see 13
of Functional Diagram). If the actual measurements
are above or below the setpoint by a margin
greater than the user-selectable alarm threshold,
the alarm terminal is activated. The alarm can be
selected as normally closed ("NC") by connecting the external
device to the C and NC terminals or normally open ("NO") by
connecting the external device to the C and NO terminals.
When activated, the alarm contacts will open or close, triggering
the mechanism of your choice. When the
alarm is activatedalarm is activated
alarm is activatedalarm is activated
alarm is activated
all other terminalsall other terminals
all other terminalsall other terminals
all other terminals (such as dosing relay etc.)
areare
areare
are
disactivateddisactivated
disactivateddisactivated
disactivated. The alarm LED light also comes on.
pH
0
1
2
ALARM
MTC ATC
mA OUTPUT
TEMP.COMP.
4/20 0/20
HI 9910
pH
SECONDS
090
45
MTC
°C
-10
80
10
0
30
20
60
70
40
50
0
pH
2.0
0.5
1
1.5
COARSE
FINE SLOPEOFFSET
PROPORTIONAL SETTINGS
ALARM
ON
OFF
SET
READ
ACID
DOSING
ALK
SET POINT
ALARM DOSINGTIME
MINUTES
1
10
2.5
5
7.5
SET pH
ALARM
LINE
BL DOSING PUMP
pH
0
1
2
ALARM
MTC ATC
mA OUTPUT
TEMP.COMP.
4/20 0/20
HI 9910
pH
SECONDS
090
45
MTC
°C
-10
80
10
0
30
20
60
70
40
50
0
pH
2.0
0.5
1
1.5
COARSE
FINE SLOPEOFFSET
PROPORTIONAL SETTINGS
ALARM
ON
OFF
SET
READ
ACID
DOSING
ALK
SET POINT
ALARM DOSING TIME
MINUTES
1
10
2.5
5
7.5
SET pH
ALARM
LINE
EXTERNAL ELECTRICAL
DEVICE ACTIVATED BY
AN ALARM CONDITION
pH
0
1
2
ALARM
MTC ATC
mA OUTPUT
TEMP. COMP.
4/20 0/20
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