EGE Elektronik Sensor with Integrated Amplifier Productseries ST 421 K-L80

Description

The EGE Elektronik Sensors with Integrated Amplifier Productseries ST 421 K-L80 is the authoritative choice for flow monitoring in large-scale piping systems or tanks. While standard sensors often have short probes that cannot reach the turbulent-free center of a large pipe, the 80mm (L80) probe ensures that the sensing tip is positioned optimally for accurate flow detection. Operating on the thermodynamic principle, the sensor utilizes a solid-state probe to monitor flow velocity. This method is highly reliable as it contains no moving parts like paddles or turbines, which are prone to mechanical fatigue, jamming, or wear—especially in large-diameter lines where flow forces are higher. The integrated electronics process the signals internally to provide a discrete PNP signal directly to your PLC.

Brand

EGE-Elektronik

EGE-Elektronik Spezial-Sensoren GmbH has been developing and manufacturing special purpose sensors for automation applications since 1976. The company serves leading international producers from a wide range of industries. Its product portfolio includes flow controllers, infrared, opto and ultrasonic sensors, capacitive proximity switches, light barriers and inductive proximity switches. EGE also provides sensors for highly sensitive applications, e. g. hazardous areas. The development department`s highly qualified staff cooperates closely with all customers, ensuring continuous product updates and enhancement.

EGE has been a pioneer in the field of flow controller and an innovator and decisive participant in the development of today's globally utilized thermal flow controllers. The in-house EMC and test laboratories ensure that all inspections and tests required for permits and conformity certificates are carried out quickly and reliably. Product quality is guaranteed with a continuously monitored quality management system in accordance with EN ISO 9001:2000.

Specifications

TYPE	ST 421 K-L80
Product ID	P10901
Medium	water, oil
Detection range water	1 … 150 cm/s
Detection range Oil	3 … 300 cm/s
Process connection	G1/2
Sensor length L	80 mm
Ambient temperature	-20 … 80 °C
Medium temperature	-20 … 80 °C
Temperature gradient fluids	250 K/min
Start-up time typ.	8 s (2 … 15 s)
Reaction time typ.	2 s (1 … 13 s)
Compressive strength	100 bar
Material sensor touched by medium	stainless steel AISI 316 Ti
Material housing	stainless steel AISI 316 Ti, brass
Protection [EN 60529]	IP 68
Electrical connection	fixed cable
Accessories (in scope of delivery)	2 x gasket G1/2 AFM 34
Associated amplifiers	SKM 420 GR, SKM 420 GSP, SKM 420 GA, SKM 522 GR, SKM 522 WR, SKZ 400 GR, SKZ 400 WR-115, SKZ 400 WR

Features

Integrated Evaluation Amplifier: Eliminates the need for external rail-mounted modules, saving cabinet space and reducing wiring.
Thermodynamic Measurement: Solid-state design ensures maintenance-free operation and high reliability in media containing particulates.
Premium V4A Stainless Steel: High-grade 1.4571 construction for maximum durability and chemical compatibility.

Applications

Large Diameter Piping: Monitoring cooling or process water in main supply lines.
Insulated Pipe Systems: Reaching through thermal insulation to access the fluid stream.
Tank and Reservoir Monitoring: Detecting movement or flow presence in large storage vessels.
HVAC Chillers: Ensuring flow in primary chilled water loops for large-scale buildings.
Wastewater Treatment: Monitoring flow in large aeration or filtration pipes where debris might jam mechanical switches.