Complementary
Diameter	16 mm
Length	150 mm
Type of installation	Cable suspension
Net weight	0.1 kg
Contractual warranty
Warranty (in months)	18
Environment
Maximum ambient air temperature for operation	100 °C
Logistical informations
Country of origin	FR
Main
Range of product	Harmony Control Relays
Product or component type	Level control probe
Accessory / separate part designation	Probe for liquid level control
Accessory / separate part destination	Liquid level control relay
Accessory / separate part category	Relay accessories
Product compatibility	RM84; RM4L; RM35LM
Packing Units
Unit Type of Package 1	PCE
Number of Units in Package 1	1
Package 1 Height	2.600 cm
Package 1 Width	15.700 cm
Package 1 Length	2.600 cm
Package 1 Weight	87.000 g
Unit Type of Package 2	S01
Number of Units in Package 2	40
Package 2 Height	15 cm
Package 2 Width	15 cm
Package 2 Length	40 cm
Package 2 Weight	3.680 kg

The LA9RM201 probe from Schneider Electric belongs to the Harmony control relay series and serves as a level control probe for measuring liquid conductivity using a conductive measurement method. It is specifically designed for use with level monitors to monitor liquid levels in containers. The probe features a cable connection and is hung in the container to be monitored, with the mounting height adjusted according to the desired fill level. The length of the probe is 150 mm, and the diameter is 16 mm, enabling a compact and precise installation. The maximum ambient temperature during operation is 100 °C, ensuring suitability for industrial environments with elevated temperatures.

Applications include monitoring liquid levels in containers, tanks, or storage vessels in industrial settings, particularly in systems requiring continuous level control. The probe is suitable for liquid media that exhibit sufficient electrical conductivity to enable the measurement method. It is commonly used in process plants, pump stations, or in the food and chemical industries, where reliable and low-maintenance level control is required.

Functions and equipment in detail include an integrated cable suspension, enabling simple and secure mounting. The probe is designed as relay accessory and serves as a sensor for level relays. The electrical connection is made via the cable, which is connected to the respective level monitor relay. The probe itself is passive and responds to the conductivity of the liquid, thereby closing or opening an electrical contact depending on the fill level. The product weight is 0.1 kg, allowing for easy handling and installation.

Technology explained simply is based on the principle of electrical conductivity. The probe consists of two electrodes that immerse into the liquid. When the liquid connects the electrodes, current flows, which is detected by the connected relay. This relay can then trigger corresponding switching operations, such as turning a pump on or off or activating an alarm. The conductive measurement method is robust and simple, as it requires no moving parts or complex sensors. The probe is designed for industrial environments, with a maximum operating temperature of 100 °C enabling a broad range of applications.

Compatibility and accessories include use with level monitors RM84, RM4L, and RM35LM. These relays are also part of the Harmony control relay series and enable integrated control. Suitable accessories include level relays such as RM22LG11MT, RM22LG11MR, and RM22LA32MR, which can be combined with the probe to meet various level control requirements, such as different resistance ranges or time delays.

Mounting and installation are performed using the cable suspension, with the probe hung into the container. Positioning is adjusted according to the desired fill level. The connection to the relay is made via the cable, which is connected to the appropriate terminal on the relay. Installation requires no special tools or additional components, as the probe is designed as a standalone measuring device.

Operational advantages include easy handling, robust construction, and the reliability of the conductive measurement method. The probe requires no regular maintenance, as long as the liquid is conductive, and is suitable for continuous operation. Compatibility with various level monitors allows flexible adaptation to different requirements. The maximum operating temperature of 100 °C extends the application range to warm environments without impairing functionality.