--- title: "Goodbye Drift: SL EVO Level Sensor with Dual Diaphragm Design" description: The new Hydrostatic Level Sensor SL EVO guarantees highly accurate, stable, and hygienic level control in every application - even outdoor or cooling tanks --- [Skip to content](https://blog.anderson-negele.com/sl-evo-level-sensor-dual-diaphragm#main-content) ![anderson-negele-hygienic-logo](https://blog.anderson-negele.com/hs-fs/hubfs/anderson-negele-hygienic-logo.png?width=331&height=58&name=anderson-negele-hygienic-logo.png) - [Home](https://www.anderson-negele.com/us/) Open main navigation Close main navigation - [Home](https://www.anderson-negele.com/us/) - [Contact us](https://www.anderson-negele.com/us/contact-us/) [Contact us](https://www.anderson-negele.com/us/contact-us/?hsLang=en) ![SLEVO_LandingPageHeader-2](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/SLEVO_LandingPageHeader-2.jpg "SLEVO_LandingPageHeader-2") ## **SL EVO: Long-term Stability Engineered Into Every Reading** A second diaphragm continuously measures atmospheric pressure, fully sealed off from the condensation, moisture, dust, and buildup that cause conventional sensors to drift. - Two coupled diaphragms and two RTD temperature sensors work in tandem for stable, accurate output - Fully closed and hermetically sealed measurement cell with no direct contact to the atmosphere - Integrated temperature compensation and tank linearization with direct output of volume, level or pressure, even for tanks with complex geometries ![SL_Dual-Diaphragm](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/SL_Dual-Diaphragm.png "SL_Dual-Diaphragm") ## The Conventional Approach Conventional sensors equalize atmospheric pressure through an open vent, creating a direct path for condensation, moisture, dust, and buildup. ![VentedSensorDiaphragm](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/VentedSensorDiaphragm.jpg "VentedSensorDiaphragm") ## The SL EVO Way: A Dual Diaphragm The SL EVO replaces the traditional atmospheric vent with a sealed reference diaphragm, eliminating a common pathway for moisture ingress and condensation-related measurement drift.  ![SL upper Diaphragm-2](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/SL%20upper%20Diaphragm-2.jpg "SL upper Diaphragm-2") --- # Goodbye Drift No more re-zeroing for humidity swings or condensation. The SL EVO holds its accuracy through the conditions that throw conventional sensors off. - Built for any hygienic application, including outdoor tanks, cooling tanks, and other environments with significant temperature fluctuations - Proven in applications like raw milk storage and beer maturation tanks - Stays within ≤0.2% of URL for a full year, minimum ![SL-Display_angle](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/SL-Display_angle.png "SL-Display_angle") ![SL-Display-colored-RGB_0.2](https://blog.anderson-negele.com/hubfs/SL-Display-colored-RGB_0.2.png "SL-Display-colored-RGB_0.2") # Hello Ease of Use - New display with optimized readout in both vertical and horizontal orientations, angled 45° for visibility from any installation - 360° signal indicator with LED ring light and color code, allowing you to see the sensor status (normal, warning, error) at a glance, even from across the room - Quick, tool-free programming and field calibration with one-touch setup via capacitive buttons or IO-Link, and remote firmware upgrade with IO-Link -  Lower maintenance requirements reduce recalibration events, service visits, and production disruptions. --- # Built to Just Work - Flex Hybrid Technology runs analog and digital communication in parallel — 4…20 mA, IO-Link, and HART 7.0, all available on one sensor - Calibrated accuracy of 0.2% of URL, with temperature stability of ±0.2% per 5°C (10°F) and a 0.5-second response time - Smart Replace Design: automatic configuration simply by plugging into the IO-Link Master ![SL_Communication_Protocols](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/SL_Communication_Protocols.jpg "SL_Communication_Protocols") ![SL_Footer_Image](https://blog.anderson-negele.com/hubfs/SL%20Next%20Gen/SL_Footer_Image.png "SL_Footer_Image") ### SL EVO is coming soon - discover it now [Discover the SL EVO](https://youtu.be/PdVXNYO3-ro) [Download SL EVO At-a-glance](https://blog.anderson-negele.com/hubfs/SL%20EVO/SL_at_a_glance_60049_en_eu_1.0.pdf?hsLang=en) [Download SL Product Information](https://blog.anderson-negele.com/hubfs/SL%20EVO/SL_50161_1.0_en_eu.pdf?hsLang=en) [Request a Sensor Demo](https://uk.anderson-negele.com/contact-customer-service) [linkedin-in icon](https://www.linkedin.com/company/anderson-negele/) [Follow us on Facebook](https://www.youtube.com/@AndersonNegele) - [Home Page](https://www.anderson-negele.com/us/) - [Contact Us](https://www.anderson-negele.com/us/contact-us-camp/) --- [![Anderson-Negele Logo](https://blog.anderson-negele.com/hs-fs/hubfs/anderson-negele_master-logo_hygienic_colour_2014_1.1.png?width=800&height=100&name=anderson-negele_master-logo_hygienic_colour_2014_1.1.png "Anderson-Negele Logo")](https://www.anderson-negele.com?hsLang=en) Anderson-Negele Fultonville, NY 12072 Negele Messtechnik GmbH 87743 Egg an der Günz, Germany