SMT3151TR Hydrostatic Level Transmitter

The Model 3151RT Lvel transmitter carries CSA approval and is ideal for environmental applications such as water wells, holding ponds, lake rivers, and chemical tank level measurements. The Drexelbrook Model 3151RT is an intrinsically safe submersible pressure transmitter ideal for liquid level...

Product Details

The Model 3151RT Lvel transmitter carries CSA approval and is ideal for environmental applications such as water wells, holding ponds, lake rivers, and chemical tank level measurements.

The Drexelbrook Model 3151RT is an intrinsically safe submersible pressure transmitter ideal for liquid level measurement in Class I Div. 1 hazardous location.

This two-wire submersible level transmitter is constructed of a 316SS body with 316SS or optional Hastelloy diaphragm. Its rugged body provides excellent environmental protection and the non-clogging, removable snubnosed end protects the sensing diaphragm while saving maintenance.

The Drexelbrook 575S indicates the level of liquid by continuously measuring hydrostatic pressure via its sensing element, an ion implanted silicon semiconductor chip with integral Wheatstone Bridge circuit.

Data is transmitted by a 4-20 mA output with an accuracy of 0.25% of range span, on static head pressures up to 690 ft.

Waterproof cabling is available in continuous lengths up to 5000 ft along with lightning protectors.

Key Features
• Easy to install
• Popular measurement ranges up to 690 Ft.
• Power supply: 12 to 40 Vdc with reverse polarity surge protection
• Temperature range: CSA intrinsically safe T3C = 32°F to 140°F (0°C to 60°C)

Product Type

Fluid level sensor, Hydrostatic transmitter, Level gauge, Level sensor, Level transmitter, Liquid level sensor, Tank level indicator, Water level sensor


What is a hydrostatic level sensor?

Hydrostatics is the science of fluids not in motion. A hydrostatic level sensor is a form of level probe that is used especially for level monitoring by measuring the hydrostatic pressure in a virtually static liquid at a pre-determined level of submersion. 

A hydrostatic level sensor is a submersible pressure transmitter that has a pressure diaphragm where the inner side of the diaphragm is vented to atmospheric pressure through a vent tube in the cable and the outer side is in contact with the liquid and measuring the static pressure of the liquid column above the transmitter. This static pressure is basically caused by the weight of the fluid on top of the transmitter and is used to calculate the level of the liquid.

Hydrostatic level sensor in use

The simplicity of using a hydrostatic level sensor makes it the instrument of choice wherever level needs to be measured, no matter if in a vented tank, vessel, lake, river or reservoir. In most cases it is suspended by the cable to the desired level of measurement or just submerged and allowed to sink to the bottom of the resource. It does not matter what the structure of the tank, basin or natural geometry is or if it has any obstructions, ledges or complex shape, a hydrostatic level sensor will always measure the pressure of the liquid unaffected by such disturbances. 

As the hydrostatic level sensor commonly is a gauge pressure sensor it automatically compensates for the atmospheric pressure changes, so the pressure measured represents only the pressure of the liquid caused by the liquid's specific gravity and the vertical distance to the surface. Therefore, the hydrostatic level sensor accurately measures the level of the liquid by calculating the distance from the measuring point to the surface level via the measured pressure. 

A hydrostatic level sensor may be calibrated in metres water column to allow for standard gravity or local gravity. For very high accuracy level monitoring often the temperature of the media may also be considered to take the temperature effects on the specific gravity into account. 

The hydrostatic level sensor is a specialised sensor for level monitoring, most commonly used in the water and waste water industry. Its simple use and reliable and accurate measurement technology make it one of the most commonly used level sensors by far.



Hydrostatic level measurement: Measuring Principle

Contite cell: The measuring cell is absolutely protected between the process isolating diaphragm and the rear isolating membrane. Also it is absolutely insensitive to condensation and aggressive gases.

Ceramic cell: The ceramic sensor is a dry sensor, i.e. the process pressure acts directly on the robust ceramic process isolating diaphragm and deflects it. A pressure-dependent change in capacitance is measured at the electrodes of the ceramic substrate and the process isolating diaphragm.

Benefits

Maximum plant safety provided by one-of-a-kind, condensate-proof Contite measuring cell

Contite cell offers very good reproducibility and long-term stability even after temperature shocks

The ceramic cell has extremely good chemical compatibility and high mechanical stability thanks to ultra-pure 99.9% ceramic

Robust ceramic membrane with integrated membrane breakage detection - also suitable for vacuum applications


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