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A vertical level sensor, also called fluid sensor or float switch, is a mechanical device that monitors liquid levels inside a container. In typical applications, a vertical water level sensor is to trigger an action when the liquid reaches a certain level.
Vertical liquid level sensors are made up of two main components: a center tubed magnetic float and a reed switch. Both the float and the reed are operated by magnets. When the float reaches a predetermined level, the reed switch reacts by closing or opening.
Standard Model | Stem Length (mm) | Voltage | Switch Type | Default Configuration & Primary Application |
BF1-030-LA | 30 | Low | NO (A) | Standard part: PP Float, M8 Thread. Compact Devices: Small water tanks, humidifiers,coffee makers. |
BF1-045-LA | 45 | Low | NO (A) | Standard part: PP Float, M8 Thread. Automotive/Appliance: Coolant expansion tanks, residential water heaters. |
BF1-060-LA | 60 | Low | NO (A) | Standard part: PP Float, M8 Thread. General Purpose: Medium-depth containers，oil reservoirs. |
BF1-100-LA | 100 | Low | NO (A) | Standard part: PP Float, M8 Thread. Universal Industrial: Most common size for tanks, HVAC systems. |
BF1-150-LB | 150 | Low | NC (B) | Standard part: NBR Float, M12 Thread. Low-Level Alarm: Ideal for fuel, diesel, or lubricant tanks where a closed-circuit alarm is needed. |
BF1-200-LC | 200 | Low | SPDT (C) | Standard part: PP Float, M12 Thread. Dual Control: Single sensor for high/low level control (pump start/stop). |
BF1-100-HA | 100 | High | NO (A) | Standard part: SS Float, M12 Thread. High Voltage Direct Control: For switching pump motors or heaters directly (up to 1000V). |
BF1-150-HA | 150 | High | NO (A) | Standard part: SS Float, M12 Thread. Deep Tank HV Control: High voltage switching in deeper tanks. |
BF1-250-LA | 250 | Low | NO (A) | Standard part: SS Float, M16 Thread. Deep Tank Monitoring: Industrial chemical tanks, large water storage. |
BF1-300-LA | 300 | Low | NO (A) | Standard part: SS Float, M16 Thread. Maximum Reach: For very deep vessels. |
What's the advantage of a vertical liquid level sensor?
Non-powered, reliable, direct indication, relatively inexpensive, various outputs
Can BST make explosion proof liquid level sensor?
Yes, ATEX certified.
What's the output of a liquid level sensor?
Analog or digital, depends on customer's needs.
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