siemens
Siemens SITRANS LU240 Ultrasonic Level Transmitter
Model: 7ML5221-1BA21-0CA0
4-hour response · Pricing in SAR · Delivery across all KSA regions
7ML5221-1BA21-0CA0 — Siemens SITRANS LU240 Ultrasonic Level Transmitter
The Siemens SITRANS LU240 is a non-contact ultrasonic level transmitter for liquid level measurement in open tanks, sumps, wet wells, and open channels from 0.3 m to 8 m — providing a maintenance-free, installation-friendly alternative to submersible and float-type level sensors in wastewater, chemical storage, and water supply applications. The ultrasonic transducer emits a burst of ultrasonic pulses (range: 50 kHz) toward the liquid surface and measures the time-of-flight of the reflected echo to compute the distance from the sensor face to the liquid surface. Since no part of the sensor contacts the liquid, the LU240 is unaffected by liquid viscosity, density, coating, or chemical composition — properties that cause rapid failure in contact-type sensors in the aggressive media common at Saudi water and wastewater facilities.
The LU240 transmitter outputs a 4–20 mA signal proportional to level (or distance, volume, or flow for open channel applications) and provides HART 7 digital communication for integration with DCS and SCADA systems. The built-in two-setpoint relay outputs (one for high-level alarm, one for pump control) allow the LU240 to operate as a standalone level switch controller for pump start/stop control in small sump pumping applications without a PLC. The integrated open channel flow measurement function — supporting standard weir and flume types (V-notch, rectangular, Parshall) with configurable flow calculation — enables the single LU240 instrument to serve as both a level transmitter and a non-contact open channel flow meter in wastewater and irrigation channels.
In Saudi Arabia, the SITRANS LU240 KSA is the most widely deployed non-contact level transmitter in municipal water and wastewater infrastructure, with installations at NWC pump station wet wells throughout the Kingdom's water supply and sewerage networks, industrial sump and effluent collection pit level control at MODON industrial estates, and chemical storage tank level monitoring at water treatment chemical dosing facilities. The LU240's compact 2-inch NPT mounting thread and integral cable entry allow installation in standard flanged or threaded nozzles without specialised mounting hardware, and the -40°C to +80°C ambient temperature rating covers Saudi Arabia's extreme summer and winter temperature range.
Razz Middle East stocks SITRANS LU240 transmitters for same-week delivery and provides level transmitter installation and commissioning services across Saudi Arabia.
Technical Specifications
Full specifications for the 7ML5221-1BA21-0CA0
- Range
- 0.3–8 m (liquid)
- Accuracy
- ±0.25% of span
- Output
- 4–20 mA + HART 7
- Relay Outputs
- 2 × SPDT (high-level, pump control)
- Open Channel
- V-notch, rectangular weir, Parshall flume
- Beam Angle
- 8°
- Process Temp
- -40 to +80°C
- Enclosure
- IP67
- Mounting
- 2" NPT or BSP thread
- Compliance
- CE, ATEX Zone 1 option
Key Features & Benefits
- Non-contact measurement principle requires no liquid wetting of the sensor, eliminating the corrosion, scaling, and fouling failure modes that degrade submersible and float sensors in aggressive wastewater and chemical media.
- HART 7 communication provides device status diagnostics including echo profile quality, temperature compensation status, and blocking distance violations for predictive maintenance scheduling without physical sensor inspection.
- Built-in dual relay outputs for high-level alarm and pump start/stop control allow the LU240 to control sump pump operation in small wet well applications without a PLC, reducing installation cost for simple pump control duties.
- Open channel flow measurement function with weir and flume calculation eliminates the need for a separate flow transmitter at NWC and municipal wastewater measurement points where an open channel structure is already installed.
- 8° narrow beam angle provides a focused measurement cone suitable for tall, narrow tanks and sumps where the beam must reach the liquid surface without reflecting off tank walls or internal structures.
- -40°C to +80°C ambient temperature rating covers Saudi Arabia's extreme summer rooftop ambient temperatures (50°C+) and cooled indoor plant room installations without derating or special options.
- IP67 sealed housing and corrosion-resistant PVC/PVDF transducer face material handle the outdoor and chemically aggressive installation environments found at Saudi water treatment, wastewater, and industrial chemical storage facilities.
Industrial Applications in Saudi Arabia
- Municipal pump station wet well level control at NWC sewage and stormwater pump stations across Saudi cities, where the LU240 relay outputs directly control duty and standby pump start/stop without a separate level controller.
- Industrial sump and effluent pit level monitoring at MODON industrial estate facilities, where non-contact measurement handles the mixed chemical and oily effluent media without sensor fouling or corrosion.
- Chemical storage tank level monitoring at water treatment chlorination and coagulant dosing stations, where non-contact measurement prevents the chemical attack that destroys submersible float and electrode sensors in concentrated chemical storage.
- Irrigation canal and wadi flow measurement at agricultural projects and stormwater management schemes, where open channel flow calculation from LU240 provides flow data for water allocation accounting.
- Open channel flow metering at municipal wastewater treatment plant inlet and outlet channels, where the Parshall flume calculation function enables SITRANS LU240 to serve as the primary plant flow meter.
- Water tower and elevated tank level telemetry for remote rural NWC distribution system monitoring, where HART over 4-20mA back-to-base communication provides tank level data to the regional operations centre.
- Construction site dewatering sump level control, where the LU240's simple 2-inch NPT installation, relay pump control output, and robust IP67 housing suit temporary installation in exposed dewatering pit conditions.
Industrial Supplier in Saudi Arabia
Get a Quote for the Siemens SITRANS LU240 Ultrasonic Level Transmitter
We respond within 4 business hours. Send model 7ML5221-1BA21-0CA0 for competitive pricing in SAR with delivery across Saudi Arabia and the GCC.
Frequently Asked Questions — 7ML5221-1BA21-0CA0
Common questions from buyers in Saudi Arabia and the GCC