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BINATROL® Diaphragm Style Bin Level Monitor
(Model G/GX/GX-SS)

Level Switch - Diaphragm Style

Bulletin Button
Industry's Preferred Diaphragm Unit for Over 30 Years
Economical Point Level Detection in Bins and Hoppers
Ultra-Sensitive Switch for Lightweight Materials
Unique External Installation and Maintenance
Multiple Diaphragm Materials
HYCAR® Protective Cover for More Abrasive Materials (Optional)


BIN-ATROL® Diaphragm Switch


Monitor’s line of BINATROL® diaphragm bin monitors consists of economical, reliable, and durable point level controls for point level detection of dry bulk materials. The units can be used to eliminate bin overflow, maintain a predetermined material level, indicate plugging of chutes or conveyors or provide any of a number of level control functions. The flush mount, non-intrusive BINATROL units are ideally used when vessel size or internal clearance is limited, or where protrusion into a vessel is not acceptable. All installation and servicing, including diaphragm replacement and sensitivity adjustment, can be done from outside the vessel.

.: Principle of Operation

.: Applications

.: Features

.: Models

.: Options

.: Accessories


.: Specifications

.: Warranty


Principle of Operation

A diaphragm bin monitor provides level indication by detecting pressure applied by the bulk material to the sensing diaphragm. The unit is installed to a vessel wall so that the diaphragm is exposed to the material to be sensed. As material contacts the diaphragm, a force is exerted through the diaphragm to a pressure plate within the bin monitor. Physical deflection of the pressure plate activates an internal switch which is user accessible for signaling alarms, lights or PLC inputs. When material recedes from the diaphragm, a light duty spring returns the pressure plate and internal switch back to their original positions.


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The BINATROL® diaphragm pressure switches / bin monitors can be used to detect high, low and intermediate product levels on dry material storage bins. The BINATROL can be used on either flat or curved surfaces. For bins with a diameter greater than 12' (3.6m), extra gaskets are not required. For certain applications, the BINATROL can also be used to detect plugged or backed-up conveyor chutes. Depending on the selected options and accessories, these units can be used with light powders, granules, materials with varying particle sizes, pellets, and abrasive and corrosive materials. These products are not normally used with materials which are very light, sticky or of large particle size.

Typical Applications include, but are not limited to:


Wood Chips





Feed Pellets





The simple design of BINATROL® diaphragm pressure switch / bin monitor provides for maximum ease of use. The BINATROL operates using a "floating" diaphragm, which is free of the electric switch mechanism. Diaphragm movement as little as 1/32" (0.8mm) triggers the unit. Also, the BINATROL pressure switch has no driven parts and thus requires no auxiliary power source. These design features ensure reliable and durable, low maintenance operation.

The BINATROL® offers a sensitivity adjustment that is accessible from outside of the bin and easily adjusted with a screwdriver. This enables the user to adjust the sensitivity of the unit, should vessel contents change, without removing the unit from the vessel.

The low profile mounting of the BINATROL® unit eliminates major protrusions into the bin. This minimizes obstruction of the material flow in the vessel or chute. Also, the beveled-edge construction eliminates any possibility of material lodging.

The BINATROL® diaphragm din monitor incorporates a unique sensing plate which provides for overpressure protection. This feature prevents damage to the unit due to heavy loads or forces. In the event that a heavy load is applied to the sensing plate, a mechanical stop prohibits the plate from exerting excessive pressure on the sensitivity spring.

One of the biggest assets of the BINATROL® diaphragm bin monitor is the ability to install and maintain the unit from outside of the vessel. All parts, including the diaphragm are accessible from outside of the bin, without removing the mounting flange. This enables the user to install the unit, change diaphragms and perform basic maintenance without removing the entire unit. For applications which require installation from within the bin, this can also be easily accomplished.



The Model G is the most basic BINATROL® diaphragm bin monitor. It provides accurate point level control on most bin types for products ranging from pellets to fine powders.

The Model GX offers all the features of the Model G, but is specially designed to provide dust-ignition proof protection. This model should be used in applications which require Class II dust-ignition proof approval.

The Model GX-SS is the dust-ignition proof version of the Model G with a type 321 stainless steel diaphragm. This diaphragm provides corrosion resistance when used with corrosive materials or added protection in abrasive applications.



The Model G and GX BINATROL® units are available with two different diaphragm materials.

Standard Diaphragm: The standard diaphragm is constructed of neoprene and is compatible with most basic applications.

Teflon® Diaphragm: A Teflon® diaphragm is available for use in high-temp applications. This diaphragm can also be effectively used in sticky applications.

The Model G, GX and GX-SS units come with a standard SPDT switch. However, for applications involving lightweight materials, Models G and GX can be specified with an ultra-sensitive switch.



Monitor offers a HYCAR® (oil resistant) cover for the diaphragm for watertight applications and to provide additional abrasion resistance. This cover is typically used with Models G and GX.



Power Requirements:



SPDT dry contact, 15A @ 250 VAC max



20 lb/ft³ (320 kg/m³ ) minimum material density

Std Switch:

15 LB/ft³ (240 kg/m³ ) minimum material density

Extra-Sensitive Switch:

10 LB/ft³ (160 kg/m³ ) minimum material density


die cast aluminum, powder coated

Enclosure Protection:

NEMA 4, IP56 (Model G ONLY)

Mounting Connection:

flange with 7.5" (190.5MM) bolt circle

Pressure Rating:

atmospheric pressure only

Wire Entry:

1/2" NPT

Diaphragm Material:

neoprene, reinforced Teflon®, or 321ss (GX-SS only)

Operating Temperature:

G/GX w/neoprene:

-40° to 180°F (-40° to 82°C)

G/GX w/Teflon®:

-40° to 250°F (-40° to 121°C)


-40° to 250°F (-40° to 121°C)



3.25 LB (1.5 kg)


G - CSA US/C Ordinary Locations

GX, GX-SS - UL and CSA Class II, Div. 1, 2, Groups F, G; CE mark (Ordinary Locations ONLY)

Min. Vessel Dia.:

12' (Smaller vessels will require modifications and extra gasketing.)

Teflon® is a registered trademark of Dupont Chemical Co.
HYCAR® is a registered trademark of the B.F. Goodrick Company



Monitor Technologies LLC warrants each BINATROL® diaphragm bin monitor it manufactures to be free from defects in material and workmanship under normal use and service within two (2) years from the date of purchase. The purchaser must give notice of a defect to Monitor within the warranty period, return the product intact and prepay transportation charges. The obligation of Monitor Technologies LLC under this warranty is limited to repair or replacement at its factory. This warranty shall not apply to any product which is repaired or altered outside of the Monitor Technologies LLC factory, or which has been subject to misuse, negligence, accident, incorrect wiring by others or improper installation. Monitor Technologies LLC reserves the right to change the design and/or specifications without prior notice.






TrueCap Level SensorTrueCap Light  
TrueCap® MK-2
Advanced RF Capacitance Level Probe
The TrueCap® Model MK-2 RF Capacitance point level probe is designed to provide a superior and stable sensitivity threshold making it suitable for a variety of powder / bulk solids and some liquid or slurry applications.

Advanced features of the Model MK-2 include:
> Automatic immunity to material build-up on the probe by its driven shield design
> Push-button calibration
> Enhanced temperature compensation
> Maximized reliability via smart sensing algorithms like “self-validating” fail-safe protection
> Visible status LED on ordinary location units
> Versatility through a variety of configuration options including: hazardous location version, split architecture design, quick-connect process connection, stub probe, cable extensions, solid extensions, Nylon® probes, Ryton® - equiv. probes, etc.

A practical application for the TrueCap would be to use this level sensor where a residual material build-up on a different sensor would cause a false material level indication.

Principle of Operation for the TrueCap RF Capacitance Level Probe:
The vessel wall and the active probe element establish an impedance reference between each other when exposed to air which has a dielectric constant of 1. When materials with a dielectric constant greater than 1 are in close proximity to the probe, the impedance of the sensing field between the sensor and the vessel wall will change. Once the amount of change exceeds a threshold that was electronically determined during the calibration process, an output relay will either be energized or de-energized depending upon the position of the fail-safe selector on the probe’s electronic circuit board. A change of as little as .5 pico-farad is all that is necessary for the probe to sense the presence of material.

Click here for more information on the TrueCap MK-2 Level Sensor or contact Monitor Technologies LLC at
Tel.: 800-766-6486 in the USA and
Tel.: 630-365-9403 worldwide.
>>Download TrueCap Product Bulletin #413
>>Click here to learn more about other Point Level Switches from Monitor Technologies

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