Optoelectronic liquid level limit switch
Type 720
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Overview Principle of function Certificates Application Informations Connections Sensor for 400 °C and 500 bar One-piece transducer up to 95 °C and 50 bar One-piece transducer WHG $19 Laboratory Laboratory ATEX Machinery Food and beverage / Biotechnology Miniswitch sterile type |
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| Type | Data sheet |
Manual | Certificates |
Description |
|---|---|---|---|---|
| 720.002X |  PDF |
PDF |
Miniswitch modulated light PN50 / 140 °C | |
| 720.002L | PDF |
PDF |
Miniswitch sterile type in cap / 140 °C | |
| 720.0030 | PDF |
PDF |
Compact level switch (d=12 mm) PN50 / 95 °C, Relay | |
| 720.0033 | PDF |
PDF |
Compact level switch (d=12 mm) PN50 / 95 °C, High-performance-Relais | |
| 720.0034 | PDF |
PDF |
Compact level switch (d=10 mm) PN50 / 105 °C, High-performance-Relay | |
| 720.0032 | PDF |
PDF |
Transducer PN50 / 95 °C to be used with Controller Type 720.250Y | |
| 720.0632 |  PDF |
PDF |
WHG PDF |
Transducer -20...+60 °C, 30 bar, Overfill Prevention Device (Germany only) together with amplifier Type 720.250Y |
| 720.0042 | PDF |
PDF |
Transducer completely glass PN10 / 300 °C to be used with Controller Type 720.250Y | |
| 720.0642 | PDF |
PDF |
ATEX PDF |
Transducer completely glass PN10 / 300 °C Ex i Zone 1 to be used with Controller Type 720.250Y ATEX |
| 720.06XX ATEX | PDF |
PDF |
ATEX PDF |
Ex-Transducer PN250 (500) / -273 to +400 °C to be used with Controller Type 720.250Y ATEX |
| 720.250Y ATEX | PDF |
PDF |
ATEX PDF |
Controller for 19"-racks and built in housing ATEX |
Overview here
Measuring Level limits with the conical tip is independent of physical properties such as density, dielectric constant, conductivity, colour and refractive index. The characteristic curve in the diagram level above shows the switching property. The transition always occurs in a region (1.1), which never can be reached by any liquid or gas (the refractive index of all gases is <1.05 and of all liquids >1.25).
The interface measurement makes use of the dependency of refractive index caused by the rounded sensor tip.
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 | Connection G1/2A, Flanges from DN20 on, DIN and ANSI, other connection
types acc. to customer's specification
| Standard material 1.4571; Hastelloy, Monel, Titan, Tantal, PTFE and others
available
| materials acc. to customer's specification (see list of
materials) | |
U-shape
version
High
pressure version
| Transducer for high duty Level- and Interface level detection in Process
applications also for Ex Zone 0
| Operating pressure Standard 25 MPa (250 bar); up to 50 MPa (500 bar)
special type, certified acc. to pressure vessel directive and AD-W
| Operating temperature Standard -60 to 250 °C, with heat sink -273 to 400
°C
| Independent from properties of liquids as density, conductivity,
dielectric constant, viscosity, colour etc. | |
| Type 720.06XX | PDF |
Transducer |
| Type 720.250Y | PDF |
Controller for 19"-racks and built in housing |
Examples for application: Overfill prevention device, Level detection,
Interface detection (e. g. oil / water), sludge level, dry running
protection,
Analysis-technique, waste water sinking, Compressors, oil-level,
High- and Low-Level-Alarms, limit switch for sight glass
level gauges and
magnetically
operated liquid level gauges
| Transducer for general level and interface detection applications in non
hazardous areas
| Operating pressure 5 MPa (50 bar)
| Operating temperature -45 to 95°C
| Independent from properties of liquids as density, conductivity,
dielectric constant, viscosity, colour etc. | |
| Type 720.0032 | PDF |
Transducer |
| Type 720.250Y | PDF |
Controller for 19"-racks and built in housing |
Examples for application: High- and Low level alarm, control of batch process for film emulsions, leak detection of deuterium oxide in nuclear reactors (radio resistant design)
| Transducer for Overfill prevention
device together with amplifier type 720.2501 acc. to WHG §19 (Germany only)
| Operating pressure 3 MPa (30 bar)
| Operation temerature -20 ... +60°C
| Independent from properties of liquids as density, conductivity,
dielectric constant, viscosity, colour etc. | |
| Type 720.0632 | PDF |
transducer |
| Type 720.2501 | PDF |
amplifier for 19" und housing |
Application: Overfill prevention device for non-mobile tanks.
| for level and interface detection
| Sensor made completely of glass as Quartz or DURAN
| Standard connections for any type of glass plants are available: Spherical
flange, conical ground seal, squeezing devices etc. | |
| Type 720.0042 | PDF |
Transducer completely glass PN10 / 300 °C to be used with Controller Type 720.0250 |
| Type 720.0250 | PDF |
Controller for 19"-racks and built in housing |
| Type 720.0030/33 | PDF |
Relay output with plug-type connection for Mini Plant-installations |
Examples for application: Distilling apparatus for purifying solvents, Mini Plant-installations
Special design for Ex Zone 0 and Zone 1
| Type 720.0642 | PDF |
Transducer |
| Type 720.250Y | PDF |
Controller for 19"-racks and built in housing |
| Connection M16x1,5 or G1/2A
| Operating temperature -40 to 140 °C
| Operating pressure 0 to 5 MPa (50 bar) | |
| Type 720.0020 to 23 | PDF |
Transistor output |
| Type 720.0030 to 33 | PDF |
Relay output |
Examples for application: Refrigerant and refrigerator oil level control in chillers, vacuum pumps etc., oil level sensing etc.
720.002L built in Varivent
housing
form F (1" / NW25 / ISO25),
plug housing made of SS
| Connection e. g. Tri-Clamp, Varivent,
Ingold, Conical seal DIN or acc. to customer's specification
| Housing and Sensor elektropolished, sterilizible
| It can discriminate foam and liquid clearly
| Independent from properties of liquids as density, conductivity,
dielectric constant, viscosity, colour etc. | |
| Type 720.0024 | PDF |
Transistor output |
| Type 720.002L | PDF |
Transistor output |
| Type 720.0030 / 33 | PDF |
Relay output |
Examples for application: Pharmacy, level control filling casks for beer, fermenters etc.
| © 2003-2008 by PHÖNIX Messtechnik
GmbH, Design by KHO letzte Aktualisierung: 08.02.08 |
