level switch. The switch will stop the system at high level. When the
level drops (the switch closes), the system will re-start after the “High
Tank Startup Delay”, in minutes (See “Settings” section of this manual)
that has been configured into the Settings data entry screen. The
controller must be configured for one or two switch operation in the
Settings menu (See “Settings” section of this manual).
Conductivity
The AL250-V2 is designed to monitor conductivity by means of a standard two
electrode conductivity cell. Sensors with cell constants of 0.01, 0.1, 1.0, and 10.0
may be used. These cell constants provide a detection range of 1 uS/cm to 100,000
uS/cm. Only sensors with a 1000 ohm RTD will work with this controller.
P
er
m
ea
te
C
on
du
ct
iv
ity
S
en
so
r
F
ee
d
C
on
du
ct
iv
ity
S
en
so
r
W
hi
te
R
ed
S
hi
el
d
G
re
en
B
la
ck
01 02 03
04 05 06
07 08
09 10
P
er
m
C
on
d
(W
hi
te
)
P
er
m
C
on
d
(S
hi
el
d)
P
er
m
C
on
d
(B
la
ck
)
F
ee
d
C
on
d
(W
hi
te
)
F
ee
d
C
on
d
(S
hi
el
d)
F
ee
d
C
on
d
(B
la
ck
)
F
ee
d
Te
m
p
(R
ed
)
F
ee
d
Te
m
p
(G
re
en
)
P
er
m
T
em
p
(R
ed
)
P
er
m
T
em
p
(G
re
en
)
W
hi
te
R
ed
S
hi
el
d
G
re
en
B
la
ck
Conductivity cells should be connected by means of Belden cable no. 8724 or
equivalent. When routing the conductivity cables, stay clear of AC cables, motors, or
other sources of electrical interference. Never run sensor cables in the same conduit
with AC cables.
Modem*
The optional modem for the AL250-V2 is housed inside the AL250-V2. The modem
is connected by plugging the ribbon cable connector onto the dual row connector
located on the I/O board under the I/O cover plate. The modem is equipped with a
standard RJ connector for connection to an analog phone line.
Do not connect the
AL250-V2 modem to an intra-office digital phone line.
Damage to the modem
can occur. Once connected to a modem, the AL250-V2 can be accessed by means
of Windows-based AquaGraph
TM
software for remote monitoring or data retrieval.
!
2-7
NOTE: Terminal numbers are not in
order intentionally. This allows
terminal connections to match
previous versions of the controller.
