|
LevelAc's Model SL-200
Series level switches are designed to provide
reliable performance on such applications as
industrial boilers, drain tanks, vapor degreasers,
deaerators, etc.
It is available
with one or two switches (mercury or snap electric
or pneumatic) installed on a single switching
station.
|
|
Mercury Switching Station -
A glass capsule
containing the mercury and switch
contacts is mounted on a pivoted arm.
A magnetic armature moves up and down
inside a non-magnetic sealing tube
following movement of the float caused
by changing liquid level in the float
chamber. As the armature enters the
field of the Alnico V magnet mounted
on the opposite end of the pivoted
arm, magnetic attraction causes the
magnet to approach the sealing tube
and tilt the mercury capsule to make
or break an electrical circuit.
Snap Switching Stations - An
Alnico 8 magnet surrounds the sealing
tube and concentrates powerful magnetic
force in a small space. Movement of
the armature into the magnetic field
shunts attraction away from the external
pole pieces which allows the pivoted
actuator plate to "snap"
the SPDT switch making the circuit
"COM" to "NC"
and breaking "COM" to "NO".
|
|
 |
Switching
Differential (See Fig 1) :
 |
| One
Station |
Adjustable
½" to 3½",
Factory set at 11/2"
unless otherwise specified.
|
|
| |
|
| Two
Station |
Adjustable,
Adjusting nut spacing
is factory set for minimum
differential. Spacing
between stations is set
at 3" maximum, This
center-to-center spacing
is adjustable. |
| |
|
| |
|
Fig 1
|
A - Station Differential
(Lower)
B - Series Differential.
C - High - Low
Differential
D Station Differential
(Upper) |
|
|
Switch
Stations:
|
| Number: |
One
or two. |
|
| |
|
| Mercury
Type: |
Equipped
with one or two
SPDT mercury switches.
|
|
|
Switch
Characterstics:
|
Mercury Switch: |
Hermetically
sealed , SPDT mercury
switches are standard. |
|
| RATINGS |
| Volts |
AC |
DC |
| Amps* |
H.P. |
Pilot
Duty |
Amps* |
H.P. |
| 120 |
13 |
1/2 |
345
VA |
10 |
1/2 |
| 240 |
6.5 |
1 |
345
VA |
5 |
1/2 |
| 400 |
3 |
1 |
345
VA |
- |
- |
. |
| |
|
|
Snap Switch: |
Non-mercury
SPDT snap-acting type.
Fully enclosed in high-strength
plastic.
|
|
| |
Rating
15 amps @ 120 or 240 VAC.
15 amps @ 120 or 240 VAC.
1/2 amp @ 120 VDC.
1/4 amp @ 240 VDC.
Pilot duty --- 345 VA.
|
| |
|
|
Pneumatic
Switch characteristics:
A pneumatic valve with
bail seating for tight
closing and designed for
mounting on a snap switching
station. Snap-action of
the switch station produces
"on/off'" or
"closed/vent"
operation. May be mounted
to vent on high level
or low level, Only one
pneumatic switch per station
may be installed.
Rating : 0
to 60 psi max. |
|
| AIR
VENTING CAPACITY |
| PSI |
9 |
15 |
20 |
30 |
40 |
50 |
60 |
| SCFM |
.63 |
.84 |
.99 |
1.29 |
1.58 |
1.86 |
2.16 |
Anti-vibration
switch rating -
4amp @ 120 VAC; 3amps @240 VAC
4amp @ 120 VDC; 2amps @240 VDC
|
| |
|
| |
|
| Internal
Wiring |
20
gauge copper (105 strands
of 40 gauge wire for extreme
flexbility) insulated
with silicone rubber.
|
| Terminal
Board |
Bakelite
barrier terminal strip.
Terminal positions marked.
|
| Switch
Frame |
Pivot
arms and wiring shields
are heavy gauge brass.
For maximum corrosion
resistance, frame may
be zinc plated on special
order.
|
| Magnet |
Alnico-V,
stabilized |
| Pivots |
Low
friction "dog"
type stainless steel pivot
screws
|
|
|
|
|
|
