KROHNE OPTISWITCH 3300 C Specifications
Technical Data Sheet
KROHNE 11/2006 7.02541.22.00
©
CMD
OPTISWITCH 3000 series
Vibration level switch
for solids
●●
Highly robust tuning fork
●●
Insensitive to build-up
●●
Set-up without filling
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Detection of solids in water
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Maintenance-free
Electromagnetic flowmeters
Variable area flowmeters
Mass flowmeters
Ultrasonic flowmeters
Vortex flowmeters
Flow controllers
Level measuring instruments
Pressure and temperature
Heat metering
Communications technology
Switches, counters, displays and recorders
Engineering systems & solutions
Subject to change without notice.
Contents
Contents
1 Description of the measuring principle.................................................. 3
2 Type overview..................................................................... 5
3 Mounting instructions ............................................................... 7
4 Electrical connection
4.1 Preparing the connection .......................................................... 9
4.2 Wiring plan .................................................................... 9
5 Operation
5.1 Adjustment, general ............................................................. 11
5.2 Recurring function test - NAMUR electronics ........................................... 11
5.3 Recurring function test - Two-wire electronics........................................... 11
6 Technical data.................................................................... 13
7 Dimensions ...................................................................... 18
Take note of safety instructions for Ex applications
Please note the Ex specific safety information which you will find on our homepage www.krohne-mar.com and which come
with the appropriate instrument. In hazardous areas you should take note of the appropriate regulations, conformity and type
approval certificates of the sensors and power supply units. The sensors must only be operated on intrinsically safe circuits.
The permissible electrical values are stated in the certificate.
2 Vibration – Level detection of bulk solids
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Contents
1 Description of the measuring principle
Measuring principle
OPTISWITCH is a level sensor with tuning fork for level detection.
It is designed for industrial use in all areas of process technology
and is preferably used for bulk solids.
The vibrating element (tuning fork) is energized piezoelectrically
and vibrates at its mechanical resonance frequency. The piezos
are fixed mechanically and are hence not subject to temperature
shock limitations. If the vibrating element is submerged in the
product, the vibrating amplitude changes. This change is detected by the integrated oscillator and converted into a switching
command.
Typical applications are overfill and dry run protection. Thanks to
its simple and robust measuring system, OPTISWITCH is virtually unaffected by the chemical and physical properties of the bulk
solid.
It functions even when exposed to strong external vibration or
changing products.
Fault monitoring
The electronics of OPTISWITCH continuously monitors the following criteria:
l Correct vibrating frequency
l Line break to the piezo drive
If one of the stated malfunctions is detected or in case of power
failure, the electronics takes on a defined switchingcondition,e.g.
the relay deenergises (safe condition).
Solid detection in water
With the OPTISWITCH (3100 C, 3200 C, 3300 C) version for solid
detectionin water (option), the vibratingelement is adjusted to the
density of water. If submerged in water (density 1 g/cm³), OPTIS-
WITCH signals "uncovered". Only if the vibrating element is also
covered with solids (e.g. sand, sludge, etc.) will the sensor signal
"covered".
OPTISWITCH 3100 C, 3200 C, 3300 C
OPTISWITCH3100 C, 3200 C and 3300 C level switches are
available in standard, cable and tube version and,
thanks to the
large array of process fittings, offer the optimal solution for any
application. They are completely manufactured of stainless steel
and have all standard approvals.
OPTISWITCH are virtually unaffected by product properties and
must hence not be adjusted.
The level switches can be used in applications with process temperatures up to 250 °C (482 °F) and pressures of up to 16 bar
(232 psi).
You can detect bulk solids up to >0.008 g/cm³ (0.0003 lbs/in³).
OPTISWITCH 3000 C is only available as screwed version with
plastic housing and without approvals.
The most important advantageof this instrument is its price, which
makes the measurement loop very cost-effective.
1.1 Application examples
Plastic processing
Fig. 1: Level detection in a silo storing plastic granules
A large number of finished products are produced in the chemical
industry as powder, granules or pellets. Plastic granules and
powder are often stored in high narrow silos which are filled pneumatically.
Vibrating level switches like OPTISWITCH have proven over the
past years in the level detection of plastics. Even with smallest
bulk densities of only 20 g/l and changing products, the instruments deliver always precise results.
Advantages:
l Tuning fork suitable down to a density <20 g/l (e.g. Aerosils)
l Product-independent switching point
l Setup without filling
OPTISWITCH 3000 C
OPTISWITCH 3000 C differs from the OPTISWITCH 3100 C,
3200 C and 3300 C level switches in its simple process fitting of
plastic and the limited selection options. It is suitable for bulk
solids from >0.08 g/cm³ (0.003 lbs/in³).
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Vibration – Level detection of bulk solids 3
Building material industry
Fig. 2: Silo for aggregatein the building material industry
Description of the measuring principle
Cement or aggregates are placed in interim storage in multiple
chamber silos. When the chambers are filled, large quantities of
dust are generated. Depending on the consistency of the aggregate, different material cones are formed and the product properties can change from filling to filling.
OPTISWITCH offers additional protection against overfilling the
aggregate silo. The flexible suspension cable avoids mechanical
strain caused by movements of the bulk solid. A filling is not
necessary for setup. Because OPTISWITCH has practically no
moving parts, it is not subject to wear.
Advantages:
l very rugged tuning fork
l High abrasion resistance
l insensitive to buildup
l Setup without filling
4 Vibration – Level detection of bulk solids
30439-EN-061114
Description of the measuring principle
2 Type overview
OPTISWITCH 3100 C OPTISWITCH 3200 C OPTISWITCH 3300 C
Preferred application: Solids Solids Solids
Length:-0.3 … 80 m (1 … 262 ft) 0.3 … 6 m (1 … 20 ft)
Process fitting: Thread G1½A, flanges Thread G1½A, flanges Thread G1½A, flanges
Process temperature:-50 … +150 °C (-58 … +302 °F)
-50 … +250 °C (-58 … +482 °F)
with temperature adapter
Process pressure:-1 … 16 bar/-100 … 1600 kPa
(-14.5 … 232 psi)
Signal output: Relay, transistor, two-wire
output, contactless electronic
switch
Ruggedness ++ ++ ++
Sensitivity ++ ++ ++
Buildup ++ ++ ++
Installation length +++
-20 … +80 °C (-4 … +176 °F)-50 … +150 °C (-58 … +302 °F)
-1 … 6 bar/-100 … 600 kPa
(-14.5 … 87 psi)
Relay, transistor, two-wire
output, contactless electronic
switch
-50 … +250 °C (-58 … +482 °F) with
temperature adapter
-1 … 16 bar/-100 … 1600 kPa
(-
14.5 … 232 psi)
Relay, transistor, two-wire output,
contactless electronic switch
OPTISWITCH 3000 C
Preferred application: Solids
Length:-
Process fitting: Thread G1½A
Process temperature:-50 … +100 °C (-58 … +212 °F)
Process pressure:-1 … 6 bar/-100 … 600 kPa (-14.5 … 232 psi)
Signal output: Relay, transistor, two-wire output, contactless electronic switch
Ruggedness +
Sensitivity -
Buildup ++
Installation length +
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Vibration – Level detection of bulk solids 5
Housing
Electronics
Type overview
Plastic Stainless steel Aluminium
Sensors
Approvals
Relay output Transistor output Contactless elec-
NAMUR output
Tuning fork
Gas explosion pro-
tection
Dust explosion pro-
tection
tronic switch
Two-wire output
6 Vibration – Level detection of bulk solids
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