Level measurement is an important part of process control and is used in a wide variety of industries.

We offer sensors, transmitters and instruments for point level and continuous level measurement.

Point level sensors are generally used for high/low, min/max, level height control or alarm conditions. Continuous level sensors are used to measure the level within a specific range and provide continuous monitoring of level conditions.

The sensors, transmitters, and controllers we use for point control, provide solutions for many level applications and are based on the following measuring methods:

• Radar
• Capacitive switch
• RF Capacitance
• Opto
• Ultrasonic
• Laser
• Infrared

The sensors and transmitters we use for continuous level measurement provide an analogue output that relates to the contents of the vessel, which when processed by the instrument is indicated continuously as a level value, and are based on the following measuring methods:

• RF capacitance
• Magnetostrictive
• Magnetic
• Hydrostatic
• Radar
• Ultrasonic
• Laser

Magnetic Technology Level Gauges

A hermetically sealed float with an internal magnetic ring is housed in a non-magnetic float chamber. The float will move up and down in the chamber as the level rises or falls in the vessel on which it is attached.A magnetic, highly visible "shuttle" or Bar graph indicator encapsulated in a hermetically sealed glass tube, is attached in a scale housing to the outside of the float chamber. It indicates the liquid or interface level without being in contact with the process fluid.

Model 26
Model 26 Magnetic Level Gauge has proven (more than 100 000 installed internationally) itself safe for total and interface applications that are toxic, corrosive, flammable, or high-pressure and is easy to maintain with no sight glasses to clean, superior in design, operability, long-term safety and cost of ownership For accurate measurement of liquids such as oil, water, acids, solvents, petrochemicals or most liquid-to-liquid interfaces across a variety of industries, The product range includes the standard model 26 magnetic level gauge (MLG) with a chamber of virtually any non-magnetic material, extruded process connections, a custom engineered float and all accessories with 316 stainless steel construction.

Main Features

•   Highly Visible Level Indication with No Process Fluid in Contact with the Glass
•   All Construction In-house by Code Certified Welders
•   Float Designed and Weighted for Maximum Accuracy
•   Transmitter and Switch Options, which Can Be Installed, Adjusted and Maintened with No Process Interruption
•   Safe for Corrosive, Flammable, Toxic, High Temperature and High Presure Applications
•   Rugged Design - Low or No Maintenance
•   5 year warranty

Approvals

• ANSI - ASME B31.1, B31.3
• ASME Code S, U, UM
• CRN
• Lloyds Registration
• NACE MR0175
• PED

Radar Level Systems

Unlike conventional through-air radar (also known as FMCW – Frequency Modulated Continuous Wave), Guided Waves Radar  utilizes a wave-guide to direct or guide very low power microwave pulses. FMCW radar sensors emit higher frequency microwave pulses through-air to reflect from the product surface.

Guided Waves Radar directs a pulse down a probe that is reflected at the material to be measured. Transit time is measured and level calculated. Use of a probe or wave-guide permits very efficient energy transmission, use of compact, low power electronics resulting in higher efficiency and lower costs.

A variety of models and options are available for silo and tank heights up to 30 meters covering liquids and solids applications.

Hydrostatic Level Measurment

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

Specifications of Meter/controller

Digits/Height    5/14.2 mm
Display            LED
Inputs              Dual range
0…+10VDC, 0...20mΑ DC

(optional)
Outputs           2/4 transistor, relay, RS232/485,
Power Supply  11-36VDC, 24VAC, 85-250 VAC
Feature 1        programmable  function/keys
Feature 2        16 point scaling for non-linear processes
Feature 3        Plug & Play Field Upgradeable
Dimensions      91.4 W  x 44.5H x104.1D mm
Display range  -19,999 to 99,999

Specifications of Transmitters

measuring ranges    STD: models from 0~2,5m to 0~500m
SL:  models from 0~2,5m to 0~500m
BH: models from 0~5m to 0~500m
Outputs                   4-20mA
Oper. temperature   -20….+85C
Power supply           13...36VDC
Accuracy                 0,25%
Protection rating      IP69

ORDERING INFORMATION
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

Specifications of Meter/controller

Digits/Height    5/14.2 mm
Display            LED
Inputs              Dual range
0…+10VDC, 0...20mΑ DC
(optional)
Outputs           2/4 transistor, relay, RS232/485,
Power Supply  11-36VDC, 24VAC, 85-250 VAC
Feature 1        programmable  function/keys
Feature 2        16 point scaling for non-linear processes
Feature 3        Plug & Play Field Upgradeable
Dimensions     91.4 W  x 44.5H x104.1D mm
Display range  -19,999 to 99,999

Specifications  Transmitters
measuring ranges  PI : models from -1..1bar
PM: models from -0,13....10bar
PL: models from 0,0125....10bar
Display                  PI: yes     PM: No    PL: No
Outputs                 PI: 4-20mA / 0-10V zero/span adjust.
PM & PL : 4-20mΑ (scaleable)
Medium
temperature          PI & PM: -25….+125C
PL:  -25….+80C
Power Supply         PI: 20...30VDC
PM & PL: 14-30VDC,

optional system components
“PI”        “PM”         “PL”             Remote Panel meter/controller    Hygienic adapters      Cable connectors

ORDERING INFORMATION
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

Non-contact laser systems for solids

Utilizing Model 1000 Laser Sensor

This laser device is a laser rangefinder that can measure to regular surfaces at a range of 30 meters. Typical accuracies are near +/- 3 mm and speeds are usually near 6 Hz, but depend on the reflectivity of the target surface.  In some modes, the 1000 can measure at 50 Hz.  Typical applications include silo fill-level measurements. 

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.

hnology

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.