Kotron
®
Model 811
RF Point Level Switch
D E S C R I P T I O N
The Kotron
®
Model 811 Level Switch offers the user great
flexibility. The switch can be used either as a single alarm
relay with narrow differential or for control purposes
with an adjustable differential. Using the proven
RF Capacitance technology, the Model 811 provides
reliable operation for a broad range of applications.
F E A T U R E S
•
Useable for both narrow differential (alarm) and wide
differential (control)
•
Intrinsically safe probe circuitry yields extra degree of
safety even with bare probes in hazardous media
•
Remote mounting up to 150 feet (45 meters) with no
preamplifier on the probe provides protection from
high process temperatures or heavy vibration
•
10-amp DPDT relay provides flexibility for both alarm
and control applications
•
Guard circuitry and probe reject buildup of media
•
Useable with all Kotron probes for application flexibility
•
LED shows relay status and aids in calibration and
troubleshooting
•
0 to 120 second time delay feature eliminates relay
chatter due to turbulence
•
Field selectable high level/low level failsafe
•
Conformally coated circuit boards reduce circuit
problems due to moisture and fungus
A P P L I C A T I O N S
•
Clean or dirty liquids
•
Viscous liquids
•
Light slurries
•
Corrosive liquids
•
High temperature/pressure liquids
•
Hydrocarbons and solvents
•
Acids and caustics
•
Foods and beverages
T Y P I C A L
A P P L I C A T I O N
P u m p / V a l v e
C o n t r o l
The Model 811 handles alarm applications as well as
pump/valve control applications with a wide or
adjustable differential.
Pump
control
C o a t i n g
R e j e c t i o n
Conductive coating
The Model 811 provides rejection of conductive buildup
by utilizing a guarded probe. Coating rejection circuit is
standard on all units.
I n t r i n s i c a l l y
S a f e
Non-hazardous Area
Hazardous
Area
The Model 811-1X06-E0X is inherently intrinsically safe
when the main amplifier is mounted in a non-hazardous
area. Barriers are included in the 811 electronics eliminat-
ing the need for separate barriers.
811-1X06-E0X
Intrinsically
safe
circuit
2
T E C H N O L O G Y
The amount of capacitance developed in any vessel is
determined by the size (surface area) of the probe, the
distance from the probe to its ground, and the dielectric
of the medium being measured. Considering that the
probe’s mounting position is fixed and that the dielectric
value of the medium is constant, then the amount of
capacitance developed in any vessel becomes dependent
upon the amount of the probe which is covered by
the media.
As media rises and falls in the tank, the amount of
capacitance developed between the sensing probe and
the ground also rises and falls. This change in capaci-
tance is compared to the adjustable set point and
changes the state of a relay when they are equal.
S P E C I F I C A T I O N S
Supply voltage
120 VAC, 50–60 Hz (+10%, -15%)
240 VAC, 50–60 Hz (+10%, -15%)
24 VDC (±10%)
12 VDC (±10%)
Power consumption
120 or 240 VAC Less than 5 volt-amps
12 or 24 VDC 1 watt maximum
Zero range
Adjustable differential
Output relays (DPDT) with gold flash contacts
0 pF minimum to 1000 pF maximum
0.5 to 700 pF
AC 10 amp @ 120/240 VAC resistive
DC 10 amp @ 30 VDC resistive
DC 0.5 amp @ 125 VDC resistive
Response time
Repeatability
Ambient temperature
Operating process pressure/temperature
100 milliseconds
Better than 1.0%
Electronics -40° to +160° F (-40° to +70° C)
Dependent upon probe selection; refer to probe bulletin 50–125
Guarded probe 8XD-AAXA-0XX 3500 psig @ +100° F (240 bar @ +40° C)
Temperature coefficient of set point
-40° to +160° F (-40° to +70° C) ±.01% per degree F of setpoint
(±.018% per degree C of setpoint)
3
D I M E N S I O N A L
I N C H E S
( m m )
S P E C I F I C A T I O N S
Rotation clearance:
2.63 (66)
3/4" PT
Conduit
connection
(plugged)
➀
9.33 (247)
3/4" NPT
Conduit
connection
Optional
mounting
flange
3/4" NPT
thread
Rotation clearance:
2.63 (66)
Rotation clearance:
3.00 (76)
6.86
(174)
➀
7.75 (197)
3/4" NPT
Conduit
connection
2.37
(60)
3/4" NPT
Conduit
connection
3/4" NPT
Conduit
connection
(plugged)
4.11
(104)
3/4" NPT
Thread
2 Holes
.38 (10) dia.
2.00
(51)
3.00
(76)
3.75
(95)
3.50
(89)
.375 (10)
➁
1/2" NPT (opt.)
3/4" NPT (std.)
Transducer/Amplifier
cable connection
18" (455)
or
36" (915)
Integral Mount with Guarded Probe
.375 (10)
Remote Mount with Guarded Probe
Rotation clearance:
2.63 (66)
3/4" NPT
Conduit
connection
(plugged)
Optional
mounting
flange
Rotation clearance:
2.63 (66)
3/4" NPT
Conduit
connection
3/4" NPT
Conduit
connection
(plugged)
3.75
(95)
➀
8.45 (215)
3/4" NPT
Conduit
connection
Rotation clearance
3.00 (76)
5.98
(152)
➀
7.75 (197)
3/4" NPT
Conduit
connection
¬
2 Holes
.38 (10) dia.
2.37
(60)
2.00
(51)
3.00
(76)
3.50
(89)
➂
.50 (13) Bare probes
.625 (16) Insulated probes
➁
1/2" NPT (opt.)
3/4" NPT (std.)
Transducer/Amplifier
cable connection
.50 (13) Bare probes
.625 (16) Insulated
probes
Integral Mount with Standard Rigid Probe
Remote Mount with Standard Rigid Probe
4
D I M E N S I O N A L
I N C H E S
( m m )
S P E C I F I C A T I O N S
Rotation clearance:
2.63 (66)
➀
9.89 (251)
3/4" NPT
Conduit
connection
.1875 (5)
.2500 (6)
1.32
(34)
4.87
(124)
5.00
(127)
.79
(19)
3/4" NPT
Conduit
connection
(plugged)
Optional
mounting
flange
➂
Optional
anchor assembly
2.95
(75)
.79
(19)
Optional
weight
Integral Mount with Flexible Probe
Rotation clearance:
2.63 (66)
Rotation clearance
3.00 (76)
3/4" NPT
Conduit
connection
3/4" NPT
Thread
.1875 (5)
.2500 (6)
1.32
(34)
4.87
(124)
5.00
(127)
.79
(19)
3/4" NPT
Conduit
connection
2.37
2 Holes
(60)
.38
(10) dia.
3.00
2.00
(76)
(51)
3.50
(89)
➀
7.75 (197)
7.42
(188)
3/4" NPT
Conduit
connection
(plugged)
3.75
(95)
1/2" NPT (opt.)
3/4" NPT (std.)
Transducer/
Amplifier
cable
connection
➂
2.95
(75)
Optional
anchor
assembly
➁
.79
(19)
Optional
weight
Remote Mount with Flexible Probe
NOTES:
Allow 6.00 (152) overhead clearance for removal of cover.
Standard process connection is
3
⁄
4
" NPT. Consult probe
brochure (50-125) for flange and other probe connections.
Probe/Amplifier Connecting Cable to be triaxial. Magnetrol
part number 037-3180-XXX standard or part number
037-3184-XXX high temperature.
5
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