On off, Alarm, Auto manual – Hanna Instruments HI 5000 User Manual
Page 17
17
pH
0
1
2
0
1
2
mS
ALARM
pH
0
SECONDS
mS
2.0
0
TIMER
MINUTES
90
PROPORTIONAL SETTINGS
4
7
0
SECONDS
pH
2.0
0
TIMER
MINUTES
90
PROPORTIONAL SETTINGS
1
4
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
EXTERNAL ELECTRICAL
DEVICE ACTIVATED BY
AN ALARM CONDITION
AUTO
MANUAL
pH
0
1
2
0
1
2
mS
ALARM
pH
0
1
2
0
200
400
ppm
ALARM
• The operator can similarly select an
alarm threshold of 0.0 to 2.0 mS/cm
(HI 9913 and HI 9923) or 0 to 400
ppm (HI 9935) by turning the alarm
knob (see 19 - Functional Diagram). If
the conductivity/TDS measurements ex-
ceed the setpoint (HI 9913 and HI
9935) or the conductivity falls below
the setpoint (HI 9923) 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 activated
alarm is activated
alarm is activated
alarm is activated
alarm is activated
all other terminals
all other terminals
all other terminals
all other terminals
all other terminals (such as dosing relay etc.) are
are
are
are
are
disactivated
disactivated
disactivated
disactivated
disactivated. The alarm LED lights also come on.
• The alarm AUTO/MANUAL switches are only to disable the
disable the
disable the
disable the
disable the
alarm terminal
alarm terminal
alarm terminal
alarm terminal
alarm terminal (e.g. the buzzer will not sound). However, all
other functions such as disactivation of the dosing relay remains
unvaried, i.e. the pump or electrovalve will cease to operate until
the alarm condition is alleviated.
• If the pH AUTO/MANUAL switch is in the MANUAL
position, the buzzer/light will not come on if the
pH value is out. The alarm will be sounded for
Conductivity/TDS anomalies, unless likewise, the
Conductivity/TDS switch is also in the manual
position.
• The controller provides for automatic fail-safe
automatic fail-safe
automatic fail-safe
automatic fail-safe
automatic fail-safe secruity by
activating the alarm if there is a power failure, regardless of
whether the NC or NO configurations were chosen.