Alfa Laval Sanitary Conductivity Sensor

Application
The Alfa Laval conductivity sensor is designed to fulfill the demands of
conductivity sensors in Sanitary and pharmaceutical production
Main features are:
- Wetted parts in AISI316L, stainless steel or PEEK
- Compact, food compatible, hygienic design
- Process temperature -20...130°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

 

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.

Technical data
Conductivity
Measuring range: . . . . . . . . . . . . . . .0 to 999 mS/cm

Accuracy: . . . . . . . . . . . . . . . . . . . .±1%of selected measuring range
Repeateability: . . . . . . . . . . . . . . . . .0.2% of FS

 

Temperature
Measuring range: . . . . . . . . . . . . . . .-20 to 140 °C.
Resolution: . . . . . . . . . . . . . . . . . . .0.1 °C.
Accuracy: . . . . . . . . . . . . . . . . . . . .≤±0.2 °C. betwen 20 and 50°C.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .≤±1.5 °C.betwen -20 and 140 °C.
Repeateability: . . . . . . . . . . . . . . . . .0.2% of FS

 

Certificates
- CEmarked
- 3.1 certificate (option)
- 3A certificate (option)

 

Process connections
Process connections: . . . . . . . . . . . .Clamp DN 50 (ISO2852)/clamp DN 51 (DIN32676)

 

Materials
Wetted parts: . . . . . . . . . . . . . . . . .AISI 316 and PEEK
Fieldhouse . . . . . . . . . . . . . . . . . . .AISI 304

 

Operating temperature
Wetted parts: . . . . . . . . . . . . . . . . .-20 to 130 °C (140°C < 1 hour)
Field house: . . . . . . . . . . . . . . . . . .-20 to 60 °C.
Protection class . . . . . . . . . . . . . . . .IP67
Maxmedia pressure: . . . . . . . . . . . . .10 bar

Weight
Conductivity sensor: . . . . . . . . . . . . .approx. 1500 gr.

 

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.

Power supply: . . . . . . . . . . . . . . . . .12-36 Vdc
Power consumptionmax: . . . . . . . . . .180 mA
Output conductivity: . . . . . . . . . . . . .4-20 mA, max. load 500 Ohm,
Output temperature: . . . . . . . . . . . . .4-20 mA, max. load 500 Ohm,
Connection: . . . . . . . . . . . . . . . . . .M12 orM16 cable gland
Response time: . . . . . . . . . . . . . . . .<3 ms