Potentiometric Level Transmitter Application
The Alfa Laval potentiometric level transmitter is designed to fulfil the demands in Sanitary and pharmaceutical production. The main features are:
- Wetted parts in AISI316L, stainless steel and PEEK
- Compact, and hygienic design
- Process temperature -20 to 140°C
- Defined empty registration
- Local Led monitor in field-housing
- Insensitive to adhesive media
- Analogue output 4-20 mA
Standard range
The Alfa Laval potentiometric level transmitter works great for measure in small containers that are full of sticky, tough substances like ketchup, honey, and toothpaste. The built-in circuits make a 4-20 mA output signal and can automatically tell whether the mounting is on top or bottom. Installation can be done at any angle. You can use the Alfa Laval potentiometric level transmitter for both CIP and SIP methods because it can handle high temperatures.
TECHNICAL DATA
Accuracy: . . . . . . . . . . . . . . . . . . . ±0.5% of FS
Resolution, input: . . . . . . . . . . . . . . 15 bit
Repeatability: . . . . . . . . . . . . . . . . . 0.1% of FS
Media conductivity: . . . . . . . . . . . . . Min 50 µS/cm
Protection class: . . . . . . . . . . . . . . IP67
Max media pressure: . . . . . . . . . . . . 16 bar
ELECTRICAL DATA
Power supply: . . . . . . . . . . . . . . . . 18-36 Vdc
Power consumption max: . . . . . . . . . 200 mA
Output: . . . . . . . . . . . . . . . . . . . . 4-20 mA, max. 500 Ohm,
Connection: . . . . . . . . . . . . . . . . . M12 plug or M16 cable gland
Response time: . . . . . . . . . . . . . . . 10 ms
Important
It is important to remember that nonlinear conductivity in the medium will change how accurate the measurements are. If it is put in a tank that doesn’t conduct electricity, like a plastic tank, a reference rod needs to be connected.
Certificates
3.1 certificate (option)
PHYSICAL DATA
Sensor length (L): . . . . . . . . . . . . . . 0 to 300 cm
Materials
Wetted parts: . . . . . . . . . . . . . . . . . AISI 316L
Fieldhouse: . . . . . . . . . . . . . . . . . . AISI 304
Operating temperature
Wetted parts: . . . . . . . . . . . . . . . . . -20 to 140°C
Fieldhousing: . . . . . . . . . . . . . . . . . -20 to 60 °C
Weight
Sensor: . . . . . . . . . . . . . . . . . . . . . Approx. 1500 gr.
Process connection
- Clamp DN50 (ISO2852) / Clamp DN51 (DIN32676)
- G1” (ISO228)
- DN32 (DIN11851)
- DN40 (DIN11851)
- DN50 (DIN11851)
Working principle
In keeping with the idea of potentiometric measurement, the Alfa Laval potentiometric level emitter can be used in any material with a conductivity of at least 50 ?S/cm. From the rod with low resistance, a high frequency current runs through the medium and into the wall of the tank. It checks the voltage between the stick and the wall of the tank. This voltage output is linked to the tank’s full amount. Temperature or sticky media don’t change the reading.
Electrical data
The integrated electronics features as standard automatic top or bottom mounting recognition, and LED´s for local readout of level. Adjustment of measuring range is done via two push buttons and LED‘s in field housing.
