load cells

We at ‘Exelon’ offer an extract of 15 invincible years of Weighing Systems. I.e. Industrial Truck Scales, Weighing Scales, Industrial Weighing, and automation. We are having thorough expertise in this industry. We have AN ISO: 9001 – 2015 certified manufacturing unit in Ahmedabad Gujarat, India.

Available as single or double ended shear beam (the latter being more common in weighbridges), this type of load cell can offer slightly lower profile and less sensitivity to side-loads, but often with poorer sealing (potted) and corrosion resistance (alloy steel). These load cells are more advantageous in silo/ vessel weighing where rigid connections and head-room constraints are an issue as compared to a vehicle weighbridge where sealing and protection are very important.

MULTI ENDED SHER BEAM TYPE (CUP & BALL TYPE)

EXELON Double Ended Ball and Cup Load cells surpass Its Competitors in Terms Of Resistance against Side Forces. It Is a Fact That the Major Reason behind Load cell Manufacturing Is the Horizontal Side Forces Created by the Vehicles during Brakes and Sudden Start-up. That is why; Scales with Column Type Load cells require Construction Absorbing Side Forces.

Load Cell - New Model jpg

For medium to high capacity applications, the double ended shear beam offers a number of advantages over other designs. Units like the one shown opposite have built-in jacking bolts which can be used to support the weighing structure during installation thus allowing the live load cells to be fitted just prior to commissioning, avoiding damage.

 

technical parameters and features of Load cells

Rated Load (E-Max)

: 20, 30, 40, 50, 60 t

Rated Output (mV/V)

: 2.00 ± 0.01

Non-linearity

: ±0.025% FSO (Full Scale output)

Hysteresis

: ±0.02% FSO

Non – Repeatability

: ± 0.01% to ± 0.02% FSO

Creep (30 minutes)

: ± 0.03% FSO

Input Resistance

: 770 ± 20Ohms

Output resistance

: 770 ± 7 Ohms

Zero Balance

: ± 1.00% FSO

 Temperature Effect on Zero

: ±0.02% FSO

 Temperature Effect on Output

: ±0.02% FSO

Protection Class (IP)

: IP68

Insulation Resistance (Ω)

: ≥ 1000 Mega Ohms

Excitation Voltage

: 7 to 15V DC

Compensated Temperature Range

: -10°C to +60°C

Operation Temperature Range

: -20°C to +60°C

Allowable Side Load

: 50%

Side load Discrimination

: 500 : 1

Safe Overload

: 150% F.S

Ultimate Safe Overload

: 300% OF R.C

Cable

: 4 x 16m

30_Load Cell - MESB Type (1)

ANALOG TYPE MULTI ENDED SHEAR BEAM LOAD CELL

Analogue load cells are the most common system. The output of the analogue load cell is a continuous millivolt (mV) signal proportional to the applied load. Further processing and Analogue-to-Digital (A-to-D) conversion are done in the indicator. Analogue load cells can easily be paired with a variety of digital indicators across multiple brands. The load cells are further differentiated by design e.g. Compression, Shear-beam type.

LOAD CELL ACCURACY:

Keep in mind that the accuracy of a load cell has no relation to it being analog or digital, compression or shear-beam type. All of these can offer an accurate and dependable system, provided the load cell fulfills the accuracy criteria as set by the relevant certifying bodies (e.g.OIML R60 for India). Insist on approval certificates rather than conformance assertions.

technical parameters and features of Load cells

Rated Load (E-Max)

: 20, 30, 40, 50, 60 t

Rated Output (mV/V)

: 2.00 ± 0.01

Non-linearity

: ±0.025% FSO (Full Scale Output)

Hysteresis

: ±0.02% FSO

Non – Repeatability

: ± 0.01% to ± 0.02% FSO

Creep (30 minutes)

: ± 0.03% FSO

Input Resistance

: 770 ± 20Ohms

Output resistance

: 770 ± 7 Ohms

Zero Balance

: ± 1.00% FSO

 Temperature Effect on Zero

: ±0.02% FSO

 Temperature Effect on Output

: ±0.02% FSO

 

Protection Class (IP)

: IP68

Insulation Resistance (Ω)

: ≥ 1000 Mega Ohms

Excitation Voltage

: 7 to 15V DC

Compensated Temperature Range

: -10°C to +60°C

Operation Temperature Range

: -20°C to +60°C

Allowable Side Load

: 50%

Side load Discrimination

: 500 : 1

Safe Overload

: 150% F.S

Ultimate Safe Overload

: 300% OF R.C

Cable

: 4 x 16m

 

PRE-CALIBRATED DIGITAL TYPE MULTI ENDED SHEAR BEAM LOAD CELL

Digital canister load cells are a popular choice in weighbridges. Unlike conventional analogue load cells, which rely on external wiring, junction boxes and A to D circuitry, digital cells offer additional protection from the unwanted electrical interference that can affect analogue load cells. Digital load cells can be pre-linearized, which allows faster installation and calibration, as well as featuring built in Diagnostic tools. Generally speaking, with digital cells,

Load Cell - New Model jpg

technical parameters and features of Load cells

Rated Load (E-Max)

: 20, 30, 40, 50, 60 t

Rated Output (mV/V)

: 240000 Counts

Rated Output (Tolerances)

: ± 200 Counts

Combined Error

: 0.0200 (± % of Rated Output)

Non-linearity

: 0.0200 (± % of Rated Output)

Hysteresis

: ±0.02% FSO

Non – Repeatability

: ± 0.01% to ± 0.02% FSO

Creep (30 minutes)

: ± 0.03% (± % of Rated Output)

Zero Return

: ± 0.03% (± % of Rated Output)

Date transmission Interface

: RS485

 Temperature Effect on Zero

: < ± 0.002% (% / °C)

 Temperature Effect on Output

: < ± 0.0012%  (% / °C)

Insulation Resistance (Ω)

: ≥ 5000 Mega Ohms @100v

Recommended Excitation Voltage

: 8 to 18 VDC

Excitation Voltage

: 12.5 to 18 VDC

Maximum Supply Current

: 15-60 mA

Protection Class (IP)

: Ip68

Compensated Temperature Range

: -10°C to +60°C

Operation Temperature Range

: -20°C to +60°C

Allowable Side Load

: 50%

Side load Discrimination

: 500 : 1

Safe Overload

: 150% F.S

Ultimate Safe Overload

: 300% OF R.C

Cable

: 4 x 16m

Feature of Digital Load Cell: 

  • EXELON’s pre-calibrated load cell system is an economical and easy-to-perform method that ensures fair results. The calibration method, PRE-CAL is the perfect system for the calibration of weighing systems, when placing test weights is impractical or an approximate calibration is sufficient. The method is independent of the density of the material, temperature, and environmental conditions such as vibrations.
  • PRE-CAL from Exelon Weighing System is a calibration method that is less accurate than using test weights, however, it offers a system for the calibration of weighing systems where it is impractical to place test weights or for applications that need an approximate calibration only.
  • The PRE-CAL uses factory calibrated load cells. The actual output of the individual load cells is measured and recorded during the production process and supplied with each load cell.
  • The outputs of each individual load cell of the respective scale are averaged and entered into a dedicated weighing terminal from Exelon Weighing System with PRE-CAL capability.
  • The terminal uses this average output to compute a theoretical calibration which is less accurate than using test weights since it does not take into account the actual mechanical characteristics of the scale.
  • Users who only need an approximate calibration would find this method useful to confirm the operational integrity of the overall system. Furthermore, it is possible to replace a load cell or terminal quickly by calibrating with this method.

Advantage of Digital Load Cell over Analog Load Cell Weighbridge:

  • Easy to Install & No Calibration / Corner Correction Required at site
  • Digital O/P which sends weight directly in step of 1 kg in digital format where in analog loadcells, the output in m/v, no analog signal
  • Since the output is digital thus the problems related to loadcell cable such as moisture, temperature are completely eliminated. This is the most important advantage over weighbridge using analog load cell
  • In Digital loadcells different lengths of different load cell cables does not influence the calibration and cornering whereas this is very critical in analog load cells. Very high stability. The more numbers of load cells in a weighbridge, better will be its resolution and so the accuracy, as counts of each load cells are added together. Whereas in analog loadcells the outputs of each load cells are averaged (integrated) in the junction box and the effective output is then input to the analog indicator.
  • Easy After Sales Service: If one of the analog loadcells in a weighbridge goes faulty then the complete wiring has to be removed from the conduit Pipes as well as the junction box for fault finding. In digital the output of each loadcell is seen on the Indicator separately and thus ease of fault findings.
  • Plug & Play adaptability: In analog loadcell based weighbridge if any single loadcell is replaced then again it requires cornering as well as calibration. Thus this being a very costly and time consuming operation as it would require placing a minimum of 1/3 of the weights of the full capacity of the weighbridge on the platform whereas in digital loadcells they can be replaced without disturbing the cornering and calibration.
  • The above point clearly indicates that with digital loadcells any unskilled person can replace the loadcells which is not so with analog loadcells, thus eliminating the need of costly experienced service engineer, they are also provided with diagnostic LED.

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