Alfa Laval Conductivity Sensor

Ideal for use in the brewery, food and beverage, and biopharm industries, Conductivity sensors provide accurate and reliable measurement of a process liquid’s ability to carry electrical currents.

Related Industries:

Food and beverage, Biotech and Pharmaceuticals

All stainless steel, hygienic design

Alfa Laval conductivity sensor are highly accurate, all-stainless steel devices that measure the ability of process liquids to carry electrical currents.

All wetted parts are made of AISI 316L stainless steel and PEEK, and designed to withstand process temperatures between -20 and +130°C. Because the conductivity sensor can withstand high temperatures, it is well suited for use in Cleaning-in-Place (CIP) and Sterilization-in-Place (SIP) processes. These compact 3A-certified sensors may be installed in pipe sizes DN40 and larger.

High accuracy, fast response

Thanks to optimized flow geometry and fast response time, Alfa Laval conductivity sensors are particularly suitable for applications that require the separation of media and/or the measurement of cleaning agents in Cleaning-in-Place (CIP) equipment. Measurements are highly accurate even at very low conductivity and flow rates.

Remote controllable, easy to use

The conductivity sensors come with four standard pre-configured measuring ranges, which can be easily adjusted from a remote location. Precise control of temperature compensation is also possible from a remote location, which makes the Alfa Laval conductivity sensor ideal for a wide range of conductivity measurements.

An integrated display indicates values for mS/cm and °C, which instantly provides users with monitoring and control data required for safe operation, especially for manually operated cleaning systems.

Operating principle

Inductive conductivity measurement is based on the principle of a transformer. An AC voltage generator controls the primary side of the transformer. The liquid flows through the channel bore (3) in the measuring head and forms a conductor loop, which links the primary side of the transformer (1) and the secondary side of the transformer (2).

The output current is proportional with the conductivity of the media. Signal conditioning, amplification and conversion provide a 4-20 mA signal output from the galvanically isolated D/A converter. The fast-response temperature sensor in the tip (4) compensates for the temperature of the liquid, thus providing highly accurate and reliable readings.

The Alfa Laval conductivity sensor output analogue signals for both conductivity measurement and temperature measurement.

Application

The Alfa Laval conductivity sensor is designed to fulfill the demands of
conductivity sensors in Sanitary production. The main features are:
– Wetted parts in AISI316L, stainless steel or PEEK
– Compact, food compatible, hygienic design
– Process temperature -20 to 140°C
– 4 configurable measuring ranges
– Adjustable, active temperature compensation
– Insensitive to polarization, adhesion and solids
– LCD display for conductivity and temperature
– 4-20 mA output for conductivity and temperature

TECHNICAL DATA

Temperature

Measuring range: . . . . . . . . . -20 to 140°C
Resolution: . . . . . . . . . . . . . 0.1°C
Accuracy: . . . . . . . . . . . . . . ?±0.2°C between 20 and 50°C
?±1.5°C between -20 and 140°C
Repeateability: . . . . . . . . . . . 0.2% of FS
Protection class: . . . . . . . . . IP67
Max media pressure: . . . . . . . 10 bar

Electrical data

Power supply: . . . . . . . . . . . 12-36 Vdc
Power consumption max: . . . . 180 mA
Output conductivity: . . . . . . . 4-20 mA, max. load 500 Ohm,
Output temperature: . . . . . . . 4-20 mA, max. load 500 Ohm,
Connection: . . . . . . . . . . . . M12 plug or M16 cable gland
Response time: . . . . . . . . . . <3 ms

PHYSICAL DATA

Sensor lenght (L): . . . . . . . . .38 or 84 mm
Materials
Wetted parts: . . . . . . . . . . . .AISI 316L and PEEK
Fieldhouse: . . . . . . . . . . . . .AISI 304

Operating temperature

Wetted parts: . . . . . . . . . . . .-20 to 130°C (140°C < 1 hour)
Field house: . . . . . . . . . . . . .-20 to 60°C

Weight

Conductivity sensor: . . . . . . .Approx. 1500 gr.

Process connection

– Clamp DN38 (ISO2852)/clamp DN40 (DIN32676)
– Clamp DN50 (ISO2852)/clamp DN51 (DIN32676)
– G1 (ISO228)
– DN32 (DIN11851)
– DN40 (DIN11851)
– DN50 (DIN11851)

Certificates

3.1 (Option) (FDA conformaty declaration for Peek materials included)

Standard range

The Alfa Laval conductivity sensor is a sensor for inductive
measurement of conductivity. The compact design in all stainless
steel enables installation in pipes from DN40 and upwards. Precise,
configurable temperature compensation and remote setting of the four
pre-configured measuring ranges make the Alfa Laval conductivity
sensor ideal for a wide range of conductivity measurements. The
integrated display for mS/cm and °C offers the user instant local
supervision, which is an advantage e.g. in manually operated cleaning
systems.
A high operating temperature limit is an advantage in SIP systems.
The optimized flow geometry and the fast response time make the
Alfa Laval conductivity sensor particularly suitable in applications for
separation of medias and measurements of cleaning agents in CIP
equipment. The accuracy is excellent even at very low conductivity
and flow rates.

Working principle

Inductive conductivity measurement is based on the principle of a
transformer. The primary side of the transformer is controlled by an AC
voltage generator. The liquid flowing through the channel bore (3) in
the measuring head and forms a conductor loop, which links between
the primary side of the transformer (1) and the secondary side of the
transformer (2).
The output current is proportional with the conductivity of the media.
Signal conditioning, amplification and conversion provide a 4-20 mA
signal output from the galvanically isolated D/A converter.
The fast-response temperature sensor in the tip (4) compensates
for the temperature in the liquid resulting in maximum accuracy and
reliability

Electrical data

Both output signals are as standard galvanicaliy isolated from the
power supply. Adjustment of measuring range and local readout of
conductivity and temperature is done via jog wheel and LCD display I
field housing. Range selection can also be done remotely

Alfa Laval Conductivity Sensor