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Casi aziendali What Is the Difference Between a Level Switch and a Level Transmitter?-100 Questions About Tuning Fork Level Switches

What Is the Difference Between a Level Switch and a Level Transmitter?-100 Questions About Tuning Fork Level Switches

2026-09-13

05. What Is the Difference Between a Level Switch and a Level Transmitter?

Core Definition

Level Switch

It is a point level sensor. It only detects whether material reaches a single fixed position. It outputs an ON/OFF discrete switch signal. It answers the question: Is there material at this point?

Level Transmitter

It is a continuous level measuring instrument. It continuously measures the real height of liquid or solid material. It outputs a variable analog/digital signal (usually 4-20mA). It answers the question: What is the exact level height?

Comparison

Item	Level Switch	Level Transmitter
Measurement type	Point level detection	Continuous level measurement
Signal output	ON / OFF switch signal (relay, NAMUR)	Variable analog / digital signal (4-20mA, HART)
Measurement result	Material present or absent at the installation point	Exact level value, real-time level reading
Typical products	Vibrating fork / tuning fork level switch, rotary paddle switch, capacitance level switch	Radar level transmitter, guided wave radar, hydrostatic pressure transmitter
Main applications	High level overflow alarm, low level dry-run protection, bin full / empty alarm	Tank inventory monitoring, continuous automatic feeding & discharging, storage volume calculation

Short paragraph for website SEO

A level switch performs point level detection. It sends an on/off signal when medium touches or leaves the sensor probe, mainly for high and low level alarms. A level transmitter provides continuous level measurement and outputs a proportional signal to indicate the actual level height. It is used for real-time tank level monitoring and inventory control.

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