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Hydrostatic Level Measurement

Level control and volume measurement with submersible pressure sensor

System LH200

reliable level measurement of liquids

High Stability and repeatability

All stainless steel housing

Resistant to high voltages surges

4-20mA, two wire output

Zero & span adjustable

Ranges 0-2,5mtr to 0-500mtr
Pressure tight cable sheath for trouble free venting

The submersible depth and level transmitter has been designed for the accurate measurement of the depth and level of fluids for a wide variety of industrial and municipal applications and is available in three versions. The standard version(STD), the sludge version (SL), and the borehole version (BH). An output signal of 4-20mA is standard, along with in-head or remote amplifier with zero/span adjustment. The standard depth transmitter is fitted with a nylon nose cones to prevent sludge build-up. The bore hole transmitter is designed to measure depth and level in bore holes of 25mm diameter

In most applications the liquid is subjected to atmospheric pressure. To provide accurate electrical measurement it is important that readings are compensated to allow for any changes in atmospheric (barometric) pressure. This compensation is achieved by using a vented cable which the sensor to “breathe” to the atmosphere. This is done through a small nylon tube that runs through the cable which ensures that the output reading is relative to atmosphere. This is particularly important for the measurement of low levels of liquid, where changes in barometric pressure can significantly affect the true reading of level. For example, at high altitude where low atmospheric pressure is present.

selection options
sensor version & measuring range i.e. BH 0~50 meters
with or without meter/controller and outputs
with flow monitor for pump protection

System LH100

reliable level measurement of liquids

with microprocessor technology flush sensors

accuracy from 0,2% & temperature compensation (0,6% PL/PM)

simple pushbutton adjustment

with or w/o digital Indication on sensor

selection options
sensor model and measuring range i.e. PI –1...1bar
With or without cable connector
With or without hygienic adapter
With or without meter/controller and outputs

Ultrasonic Level measurement – a non contact technology

Systems using ultrasonic sensors provide a cost effective sensing method with unique properties not possessed by other sensing technologies. By using a wide variety of ultrasonic transducers and several different frequency ranges, an ultrasonic sensor can be designed to solve many application problems that are cost prohibitive or simply cannot be solved by other sensors. Ultrasonic sensors continuously emit high frequency sound pulses inaudible to the human ear which travel away from the sensor, hit the surface of the target and are reflected back to the sensor. The sensor electronics measure the time taken by the signals to return after being reflected by the target surface.

Since the speed of sound is affected by air temperature, our ultrasonic sensors include a built-in temperature sensor. Level/distance measurements are automatically temperature compensated throughout the operating temperature range of the sensor.

Sigma has a variety of models available to satisfy the requirements of most demanding applications.


Direct measuring value output in mm/cm or % via LED display
Temperature compensation for accurate measuring with fluctuating temperature
accuracy with temperature drift internal compensation, =< 2%
Numerical sensor setting via LED display for a complete pre-setting of the sensor
1 or 2 pnp or npn switching outputs for all controls
Analogue output 4-20 mA and 0-10 V for two signals in one device
Operating voltage 9-30 V for application in various supply networks
Additional teach-in-function for a traditional setting of detect points
Automatic synchronisation for simultaneous operation of up to ten sensors in confined spaces
Automatic switchover between current and voltage output for simple operation

Different operating modes and device configurations enable our ultrasonic sensing systems to be used in most conceivable automation applications