Reliable level control is essential in tanks, hydraulic oil reservoirs, machinery systems and small storage applications. In many industrial systems, the level switch must be compact, economical, easy to install and suitable for safe operation with different liquids.
The DX-ELM Level Switch Series is designed for these requirements. With its magnetic float operating principle, stainless steel wetted parts, compact structure and ATEX-certified housing options, DX-ELM provides a practical solution for point level detection in industrial tank applications.
What Is the DX-ELM Series?
DX-ELM is a level switch series used for tank level control. According to the catalog, the product is especially preferred by machinery manufacturers because of its ease of use and economical structure.
The series includes several model options such as DX-ELM31, DX-ELM41, DX-ELM51, DX-ELM51s, DX-ELM32, DX-ELM42, DX-ELM52, DX-ELM61s and DX-ELM64s.
Thanks to its small dimensions, the DX-ELM series does not occupy much installation space. Since the wetted parts are made from stainless steel, it can be used safely in various liquid applications.
Operating Principle
The DX-ELM series operates with a magnetic float and reed sensor principle.
A magnet located inside the float moves with the liquid level. When the magnetic field of the float reaches the position of the reed sensor inside the tube, the electrical circuit opens or closes.
When the float moves away from the reed sensor, the sensor returns to its previous state. If requested, the contact can be produced in reverse logic.
The level signal can be evaluated through a relay circuit and used for alarm, pump control, automation input or equipment protection.
Application Areas
The DX-ELM series is suitable for machines, hydraulic oil tanks, small storage tanks and similar tank applications.
It is especially practical for compact machinery and OEM systems where simple level control is required without complex electronic measurement systems.
Typical uses include low-level alarm, high-level alarm, pump protection, filling control and tank status monitoring.
Main Advantages
The DX-ELM series offers several practical advantages.
It is economical, practical and easy to install. It also offers fast delivery and complete stainless steel construction for wetted parts.
These advantages make the product suitable for machinery manufacturers, system integrators and industrial users who need reliable point level detection in compact tank applications.
ATEX and Exproof Certification
The DX-ELM series is available with ATEX certification.
The catalog lists certification for gas and dust atmospheres:
II 1/2G Ex db IIC TX Ga/Gb for gas
II 1/2D Ex ta/tb IIIC TX Da/Db for dust
The certified ambient condition is shown as -20 °C < Tamb < +60 °C, with IP66/IP68 protection up to 2 meters.
This makes the DX-ELM series suitable for hazardous area applications where certified level switching is required.
DX-ELM31, DX-ELM41 and DX-ELM51 Vertical Models
DX-ELM31, DX-ELM41 and DX-ELM51 are vertical mounting models.
All three models use aluminum housing and stainless steel wetted parts. The float material is 304 stainless steel standard with optional 316 stainless steel for DX-ELM31, while DX-ELM41 and DX-ELM51 use 316 stainless steel float material.
The working temperature is maximum 125 °C. The ambient temperature range is -20 °C to +60 °C, and protection class is IP66/IP68.
DX-ELM31 Technical Features
DX-ELM31 uses an S1Y 28 mm float type. The standard mechanical connection is R 1".
Maximum pressure is 10 bar, and minimum density is 0.80 g/cm³.
The electrical connection is terminal type. It has 1 standard float and 1 x SPST-NO contact as standard.
The contact current is 1 A, maximum contact power is 10 W / VA, and maximum supply voltage is 200 VDC / 140 VAC.
DX-ELM41 Technical Features
DX-ELM41 uses an S2A 43 mm float type. The standard mechanical connection is R 1 1/2".
Maximum pressure is 30 bar, and minimum density is 0.80 g/cm³.
It has 1 standard float and 1 x SPST-NO contact as standard. Contact current is 1.5 A, maximum contact power is 50 W / VA, and maximum supply voltage is 200 VDC / 250 VAC.
DX-ELM51 Technical Features
DX-ELM51 uses S4A / S40A 52 mm float type. The standard mechanical connection is R 2".
Maximum pressure is 30 bar, and minimum density is 0.80 g/cm³.
It has 1 standard float and 1 x SPST-NO contact as standard. Contact current is 1.5 A, maximum contact power is 50 W / VA, and maximum supply voltage is 200 VDC / 250 VAC.
DX-ELM32, DX-ELM42 and DX-ELM52 Angled Vertical Models
DX-ELM32, DX-ELM42 and DX-ELM52 are also vertical models, but their mechanical design provides a different float orientation compared with the straight versions.
The technical values are similar to DX-ELM31, DX-ELM41 and DX-ELM51.
DX-ELM32 uses an S1Y 28 mm float, R 1" connection, 10 bar maximum pressure and 0.80 g/cm³ minimum density.
DX-ELM42 uses an S2A 43 mm float, R 1 1/2" connection, 30 bar maximum pressure and 0.80 g/cm³ minimum density.
DX-ELM52 uses an S4A / S40A 52 mm float, R 2" connection, 30 bar maximum pressure and 0.80 g/cm³ minimum density.
All three models have terminal electrical connection, one standard float, SPST-NO contact structure and IP66/IP68 protection.
DX-ELM61s and DX-ELM64s Horizontal Models
DX-ELM61s and DX-ELM64s are horizontal mounting models.
Both models use aluminum housing, 304 stainless steel float material, 304 stainless steel wetted parts and 304 stainless steel tube material.
The working temperature is maximum 125 °C, and the standard mechanical connection is R 1/2".
Maximum pressure is 5 bar, and minimum density is 0.70 g/cm³.
Both models have terminal electrical connection, one standard float and 1 x SPST-NO contact. Contact current is 0.7 A, maximum contact power is 10 W / VA, and maximum supply voltage is 180 VDC / 130 VAC.
The difference between DX-ELM61s and DX-ELM64s is the float angle and mechanical structure shown in the catalog. DX-ELM61s uses S3Y 17 mm float type, while DX-ELM64s uses S3Y-1 17 mm float type.
DX-ELM51s Model
DX-ELM51s is a vertical model with a more protected structure.
It uses aluminum housing, 304 stainless steel standard float material with optional 316 stainless steel, and 304 stainless steel wetted parts with optional 316 stainless steel.
The float type is S40A 52 mm. Maximum working temperature is 125 °C, maximum pressure is 30 bar, and minimum density is 0.80 g/cm³.
It has 1 x SPDT-NO/NC contact, contact current of 1.5 A, maximum contact power of 50 W / VA, and maximum supply voltage of 200 VDC / 250 VAC.
Electrical Connection
The DX-ELM series uses terminal electrical connection.
The catalog shows connection structures for NO, NC and COM terminals depending on contact type.
This allows the switch to be connected to PLC inputs, relay circuits, alarm systems, pump control panels or simple electrical monitoring systems.
Housing and Protection
The DX-ELM series uses B22x aluminum housing. The housing protection class is IP66/IP68, and the housing temperature range is listed as -40 °C to +200 °C.
The housing dimensions are 117 x 102 mm. The housing has EU-type examination certificate number TSE 22ATEX 0175U.
The housing marking is listed as II 2G Ex d IIC Gb and II 2D Ex tb IIIC.
The cover gasket is NBR nitrile rubber, suitable up to 120 °C, with FPM / Viton available as an option up to 200 °C.
Temperature Class Information
The catalog includes a temperature class table for DX-ELM metal models.
The standard model working temperature is -40 °C to +125 °C, and the waiting time before opening the cover is 30 minutes.
The thermal protection fuse is 105 °C.
For Group II gas applications, the temperature classes are listed as:
T6 for process temperature below 80 °C
T5 for process temperature below 95 °C
T4 for process temperature below 125 °C
For Group III dust applications, the temperature class is listed as T60 °C for process temperature below 60 °C.
Mechanical Connection Options
The DX-ELM series offers many mechanical connection options.
Threaded options include R 3/8", R 1/2", R 3/4", R 1", R 1 1/4", R 1 1/2" and R 2".
Metric and NPT options include M14x1.5, M16x1.5, M18x1.5, 1/2 NPT, 3/4 NPT and 1 NPT.
Flanged options include DN25, DN32, DN50, DN80 and DN100 in PN16 and PN40 standards, as well as ANSI 150 LBS flange options.
This broad connection range allows DX-ELM to be adapted to different tank designs and process standards.
Material Options
The catalog lists 304 stainless steel and 316 stainless steel material options.
Tube material options include 304 stainless steel and 316 stainless steel.
This allows users to select the correct material according to fluid compatibility and process requirements.
Optional Accessories
The DX-ELM series includes several optional accessories.
A 304 stainless steel protection sleeve is available. It is welded, hinged and openable / closable, and it is designed to protect the switch against external environmental conditions.
Optional configurations also include wave-prevention sleeves for different ELM models, float protection, Pt100 sensor option and special configurations.
These options help adapt the switch to applications with turbulence, waves or additional temperature monitoring requirements.
Leak Testing
The catalog states that all floats are tested with helium leak testing for sealing.
This is an important quality detail because the float must remain sealed for reliable level switching and long service life.
Why Choose DX-ELM?
DX-ELM is a strong choice when a compact, economical and stainless steel level switch is required for tank level control.
Its magnetic float and reed sensor principle provides simple and reliable switching. The wide model range supports vertical and horizontal mounting, different float sizes, different connection types and various pressure ratings.
With ATEX certification, IP66/IP68 protection and stainless steel wetted parts, DX-ELM can be used in demanding industrial and hazardous area applications.
Conclusion
The DX-ELM Level Switch Series provides compact and reliable point level control for tanks, hydraulic oil reservoirs, machinery and small storage applications. With magnetic float operation, stainless steel wetted parts, terminal contact output, vertical and horizontal model options, ATEX certification and IP66/IP68 housing protection, DX-ELM offers a practical level switching solution for industrial users.
From machinery manufacturers to process tank applications, DX-ELM helps provide dependable level information for pump control, alarm systems and automation circuits.