The Alpha Beam Load Cell
Hermetically Sealed Bending Beam — Precision Sealed for the Most Demanding Applications
The Alpha Beam — Where Hermetic Sealing Meets Bending Beam Precision
The Alpha Beam is a low capacity bending beam load cell where the strain-gaged sensing element is hermetically sealed inside a metal bellows — permanently protected against moisture, solvents, and contamination. Built around BLH Nobel’s patented SR-4 foil strain gage technology and a full Wheatstone bridge circuit, the Alpha Beam delivers high accuracy load cell performance at capacities from 25 to 500 Newtons for food processing, pharmaceutical manufacturing, medical weighing, and precision industrial applications.
Whether you are selecting a process weighing load cell for ingredient dosing, a precision load cell for industrial weighing in a pharmaceutical cleanroom, or a compact transducer for medical testing, the Alpha Beam provides metrological-grade accuracy in a hermetically sealed, IP67-rated stainless steel package — certified for hazardous areas and approved for legal-for-trade use.
At a Glance
Alpha Beam Load Cell - Specifications
|
Capacity Range |
25 – 500 N (5.5 – 112 lb) |
|
Capacities (lb) |
5.5, 11, 22, 34, 56, 112 |
|
Measurement |
Bidirectional (tension & compression) |
|
Strain Gage |
SR-4® foil strain gage |
|
Bridge Circuit |
Full Wheatstone bridge |
|
Protection Class |
IP67 |
|
Sealing |
Hermetic (welded metal bellows) |
|
Certifications |
cFMus, OIML R60, EN 45501 |
|
Hazardous Areas |
Class I, II, III — Div. 1 & 2 |
Core Features
WHAT MAKES THE ALPHA BEAM A PRECISION LOAD CELL INDUSTRIAL WEIGHING
Hermetically Sealed Metal Bellows
The gaged sensing element is enclosed inside a welded metal bellows — not potting compound, not adhesive seals. This metallurgical barrier protects the SR-4 strain gages against water immersion, cleaning solvents, and chemical exposure. The seal does not degrade with age, temperature cycling, or repeated washdown. A permanently sealed IP67 load cell that maintains calibration and accuracy throughout its service life.
SR-4® Foil Strain Gage Technology
The heart of the Alpha Beam is the BLH Nobel-developed SR-4 foil strain gage — the same technology family that BLH pioneered decades ago and that remains the global standard for precision strain measurement. Connected in a full Wheatstone bridge load cell circuit with temperature compensation resistors, the SR-4 strain gage load cell delivers accuracy and zero stability across a wide operating temperature range.
Bidirectional Measurement
Within its capacity range, the Alpha Beam measures force in both directions — tension and compression — producing an mV/V output signal directly proportional to the applied force. This bidirectional capability makes it suitable for pull/tear strength testing, batch weighing with uplift forces, and medical testing where forces reverse during measurement cycles.
Low Capacity, High Accuracy
Rated capacities from 25 to 500 Newtons (5.5 to 112 lb) cover the low-capacity range where bending beam load cells outperform shear beam designs. OIML tested and approved per R60, the Alpha Beam meets the accuracy requirements for legal-for-trade weighing in bench scales, portable scales, and process weighing applications.
Hazardous Area Approved
Certified by cFMus for use in Class I, II, and III, Division 1 and 2 hazardous locations. This means the Alpha Beam can be installed in pharmaceutical cleanrooms with solvent exposure, chemical processing areas, grain handling facilities, and other environments classified as hazardous — without additional enclosures or barriers.
OIML Approved — Legal for Trade
OIML tested and approved in accordance with European Standard EN 45501:1992 and OIML International Recommendation R60. This means the Alpha Beam is accepted by weights and measures authorities for commercial and trade applications — not just industrial process use. A VPG load cell with full metrological traceability.
Industry Applications
Where the Alpha Beam delivers value: its combination of hermetic sealing, low capacity precision, and hazardous area certification makes it the process weighing load cell of choice across industries where hygiene, accuracy, and environmental resistance must all be met simultaneously.
Load Cell for Food Processing
Ingredient dosing, recipe batching, checkweighing, and bench scale integration in food processing plants where daily washdown with hot water and cleaning chemicals is standard. The hermetically sealed stainless steel load cell body eliminates crevices where bacteria can harbor — a critical hygiene requirement that potted or adhesive-sealed load cells cannot meet with the same permanence.
Load Cell for Pharmaceutical Manufacturing
Active ingredient weighing, tablet press monitoring, and cleanroom batch control where accuracy, traceability, and contamination-free operation are non-negotiable. The Alpha Beam's OIML approval and hermetic seal satisfy the dual requirements of pharmaceutical manufacturing: metrological precision for regulatory compliance, and environmental protection for GMP operation.
Medical Weighing and Pull/Tear Strength Testing
Patient weighing systems, rehabilitation force measurement, and material testing where bidirectional measurement, compact form factor, and resistance to cleaning agents are essential. The low capacity range (25–500 N) matches the force levels encountered in medical devices, while the IP67 rating ensures reliability through repeated sterilization cycles.
Low Capacity Batching and Small Vessel Weighing
Precision dosing of catalysts, pigments, and additives where small quantities must be measured with high accuracy. The Alpha Beam serves as a process weighing load cell in applications where the vessel or hopper is small enough that total loads fall within the 25–500 N range — making it suitable as a load cell for silo and tank weighing in small-vessel configurations.
TECHNOLOGY
WSR-4 STRAIN GAGE TECHNOLOGY AND WHEATSONE BRIDGE PRECISION
The name SR-4 has been synonymous with strain gage technology since BLH introduced it as the first commercially available bonded resistance strain gage. Today, BLH Nobel’s SR-4 foil strain gages remain at the core of every Alpha Beam — and every KIS-series load cell in the BLH Nobel product line. Four SR-4 gages are bonded to the bending beam element and electrically connected to form a full Wheatstone bridge. Temperature compensation resistors are integrated into the bridge circuit to maintain accuracy across the operating temperature range.
This is not a generic commodity sensor. The Alpha Beam is a strain gauge load cell designed and manufactured by the company that invented the strain gage — within Vishay Precision Group, the world’s largest manufacturer of precision foil resistors and strain gages. A load cell made in Sweden with a technology lineage that goes back to the origins of strain measurement itself.
Technology Highlights:
-
SR-4® foil strain gages — pioneered by BLH, refined across decades
-
Full Wheatstone bridge with integrated temperature compensation
-
Metal bellows hermetic seal — metallurgical, not adhesive
-
Manufactured within Vishay Precision Group (VPG) in Sweden
-
Complete vertical integration: strain gage, load cell, and instrument from one source
FREQUENTLY ASKED QUESTIONS
ALPHA BEAM - TECHNICAL Q&A
What is a hermetically sealed bending beam load cell and how does it work?
A hermetically sealed bending beam load cell is a precision force transducer where the strain-gaged sensing element is enclosed inside a welded metal bellows, creating a permanent barrier against moisture, solvents, and contaminants. When a force is applied, the beam deflects and SR-4 foil strain gages bonded to the beam detect the resulting strain. These gages are connected in a full Wheatstone bridge circuit that produces an mV/V output signal directly proportional to the applied force. The hermetic seal means no adhesive seals or potting compounds that can degrade over time — the protection is metallurgical and permanent.
Which load cell is best for low-capacity process weighing in food and pharmaceutical applications?
The BLH Nobel Alpha Beam is specifically designed for low-capacity process weighing from 25 to 500 Newtons. Its hermetically sealed stainless steel construction meets the hygiene and washdown requirements of food processing and pharmaceutical manufacturing environments, while the IP67 rating ensures reliable operation during cleaning cycles. OIML approval confirms metrological accuracy for trade-legal applications. The cFMus hazardous area certification adds another layer of suitability for pharmaceutical cleanrooms and food plants where solvent exposure or combustible dust may be present.
What are the advantages of a bending beam load cell vs a shear beam load cell?
Bending beam load cells excel in low-capacity applications — typically below 500 N — where high accuracy and compact form factor are critical. They offer superior resolution at small loads and can be hermetically sealed with a bellows enclosure without affecting the measurement. Shear beam load cells are better suited for medium to high-capacity applications where resistance to side loading is the priority. For bench scales, medical weighing, low-capacity batching, and pull/tear testing, a bending beam load cell like the Alpha Beam delivers accuracy and environmental protection that shear beam designs cannot match at these small capacities.
How does hermetic sealing improve load cell performance in harsh industrial environments?
Hermetic sealing creates a permanent, metallurgical barrier around the strain gages and electrical connections — unlike potting compounds or adhesive seals that can crack, absorb moisture, or degrade over time. This means the load cell maintains its calibration and accuracy even after years of exposure to washdown cycles, chemical cleaning agents, humidity, and temperature cycling. For food processing and pharmaceutical manufacturing, hermetic sealing also eliminates crevices where bacteria or product residue can accumulate. The result is a precision load cell for industrial weighing that stays accurate and hygienic for the entire service life.
Why does it matter where a load cell is manufactured and what are the benefits of European production?
Load cell manufacturing demands precision metalworking, clean-room strain gage bonding, and rigorous calibration — processes where quality culture and traceability directly affect measurement accuracy. BLH Nobel is a load cell made in Sweden, manufactured within Vishay Precision Group — the world’s largest manufacturer of precision foil resistors and strain gages. European production means shorter lead times and easier logistics for customers across EMEA, full material traceability, compliance with EU regulations from the source, and a manufacturing heritage that dates back to the invention of the SR-4 strain gage. Every Alpha Beam carries that lineage from gage to finished VPG load cell.
NEED AN ALPHA BEAM FOR YOUR APPLICATION?
Our application engineers help you select the right KIMD variant, capacity, certification package, mounting configuration, and compatible instrumentation for your specific vessel — mining, chemical, agricultural, cement, pulp and paper, or food industry.
