OI/LMS100-EN Rev. A |
LMS100 Magnetic Level Gauge Switch 13
9.0 Ordering Information:
LMS100.a.b.c.d
a
Mounting
A1
Standard, up to 300 °F (149 °C) (mounted to
chamber via gear clamps)
A2
Switch rod mount up to 350 °F (176.6 °C) max
process temperatures. When used with chamber
insulation option,
800 °F (427 °C) max process temperatures
b
High temperature processes insulation options
Y0
Standard, without insulation pad, up to 300 °F (149
°C) (standard gear clamp mounting)
P1
Insulation pad (IH) for temperature, up to 575 °F
(301.6 °C) (with standard gear clamp mounting
only)
c
Approvals
Y0
General Purpose, (not for hazardous locations)
N4
FM / FM-C (Canada), (see applicable approval
markings on page 2)
E4
ATEX, IECEx, (see applicable approval markings on
page 2)
d
Electrical cable connection
A1
Standard 1/2 inch FNPT
U8
M20 adapter 316 SS, ATEX, IEC, CSA, Ex
approved
E8
1/2 inch by 1/2 inch NPT elbow for cyrogenic
insulation applications, ATEX, IEC, CSA, Ex
approved
E9
1/2 inch NPT by M20 elbow for cyrogenic insulation
applications, ATEX, IEC, CSA, Ex approved
Accessories ordered separately
AR1
10 A relay output module (IR10)
AR2
Pump pack controller (PP10)
Operation
The LMS100 consists of a form C reed switch actuated by a
rotating permanent magnet. The reed switch uses precious
metal contacts in an inert gas atmosphere sealed by glass to
metal bond. A magnetic float traveling in a chamber, relative
to the LMS100 causes the reed switch to change state. After
the float has passed, the reed switch will maintain it’s state
until the float reverses direction and passes the switch in the
opposite direction. The action of the switch is break before
make. The hermetically sealed contacts serve to insure a
high degree of hazardous area safety, weather resistance
and general reliability of the product.
Application
The LMS100 will provide either a normally open or normally
closed dry contact which may be used to activate external
devices such as alarms or annunciator. Its main application
is to sense the passing of a magnetic float in a KM26 level
gauge, or similar chamber, attached to a vessel containing a
fluid. These trip points can be used for alarms to activate a
pump motor starter relay.
Mounting
The LMS100 is mounted using two stainless steel clamps that
pass behind the housing’s integrated mounting tabs. The switch
can be easily positioned by loosening the clamp and sliding the
switch to the correct position on the chamber. Other switches can
be added at any time, without the concern for additional process
piping or valves. Note that two switches can be mounted so that
they can trip at the same point or at two points separated by more
than the height of the switch.
C
N.C.
N.O.
LMS100: Float Below Switch
C
N.O.
N.C.
LMS100: Float Above Switch
Figure 1:
Contact closure shown for both condi-
tions of the switch relative to the magnetic float.
