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A weighbridge is an important piece of equipment in any industry vertical where inwards or outwards transaction of material is done through road vehicles and based on weight. Being a capital asset requiring substantial investment, it is important to know technicalities before purchasing one.

The monetary investment in procuring a weighbridge broadly consists of three parts.

  • Cost of purchasing the weighbridge equipment
  • Cost of civil foundation for installing the weighbridge
  • Cost of maintaining the weighbridge

Purchase & maintenance costs depend on factors like size, capacity, usage, instrumentation specification, features, quality & brand. The cost of civil foundation depends on the type of installation of weighbridge.

The electronic* weighbridges can be categorised on basis of type of installation:

  1. Pit mounted weighbridge
  2. Pitless weighbridge (also known as Surface mounted)
    a. With dedicated foundation for permanent use
    b. With alternate foundation for non-permanent (Portable) use

Pit mounted weighbridge:

  • Weighbridge platform top is flush with floor level
  • Requires a pit to accommodate height of weighbridge structure
  • Requires headroom space for maintenance access by service personnel

Advantages:

  • Takes up less floor area, more suitable for smaller spaces
  • Easier access to weighbridge platform as no ramps are required

Disadvantages:

  • High cost of civil foundation (typical pit depth 1.2~1.5m)
  • Pit is prone to waterlogging & debris accumulation
  • Additional cost of pump & periodic cleaning of pit
  • Civil cost is wasted if weighbridge is required to be relocated later

Pitless weighbridge (Surface mounted):

  • Pitless weighbridge is above the road surface level
  • Does not require a pit for installation
  • Requires sloped ramps to enable vehicles to access the weighbridge

Advantages:

  • Cost of civil foundation is lower than pit type
  • Easy to clean & maintain as no pit is involved
  • Possible to relocate economically with special type of foundation

Disadvantages:

  • Requires more space & turning radius due to presence of ramps
  • Higher the deck height, longer will be the length of ramps.
  • Steep slope of ramps or improper design can cause unwanted shock loads

Portable Pitless Weighbridge:

  • ‘Portable’ or ‘Mobile’ weighbridge is a sub-type of pitless weighbridge
  • It is in fact semi-portable and not freely portable like bench or platform scales
  • Requires a foundation, re-installation, re-calibration & stamping to relocate
  • Uses alternate design of foundation like existing RCC floor or transportable RCC blocks to save civil costs

What should you consider when deciding?

  • Pitless weighbridge is the preferable option, unless space is a constraint
  • Compact, low height deck structures are better as they need lesser ramp length
  • Common structural design for pit/pitless weighbridge gives flexibility of options
  • Pit/pitless decision has no relation with accuracy of weighbridge, which depends on load cells used
  • Both pit/pitless require a good foundation having load bearing capacity as specified in the ‘Plan of foundation’ drawings provided by the weighbridge supplier

Avery Weigh-Tronix offers weighbridges with compact & modular, low-height deck structures, common for pit or pitless installation. The use indigenously manufactured & repairable T302X / T301X high accuracy load cells, certified as per global OIML-R60 standards for C5/C6 accuracy class.

Avery India Pitless Weighbridge

*This article specifically covers electronic road vehicle weighbridges and not the mechanical (lever-based structure with dial/steelyard indication) or electro-mechanical (lever-based structure with single load cell) types as these are obsolete technologies not relevant in current scenario.

Pitless weighbridges available

ZM510-BMI Steel Deck Weighbridge

ZM510-BMI Steel Deck Weighbridge

For general use standard duty weighing of regular commercial road vehicles with exceptional precision and reliability. 40 to 100 tonnes.

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ZM510-J2 Heavy Duty Steel Deck Weighbridge

For industrial use heavy duty weighing of trucks and road vehicles with exceptional precision and reliability. 50 to 120 tonnes.

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ZM510-BMI Steel Deck Weighbridge

ZM510-BMI Ultra Steel Deck Weighbridge

For standard duty weighing of regular commercial road vehicles with exceptional precision and reliability. 50 to 100 tonnes.

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ZM510-J2 Ultra Heavy Duty Steel Deck Weighbridge

ZM510-J2 Ultra Heavy Duty Steel Deck Weighbridge

For heavy duty weighing of industrial trucks and road vehicles with exceptional precision and reliability. 50 to 120 tonnes.

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