Bag filling scales are available with a mechanical weighing mechanism or a digital weighing mechanism.

Mechanical Bagging ScalesHamer HGB Mechanical GW Scale
Mechanical scales have a counterbalance weight system. Certified counterweights (i.e. 1, 2, or 5 lb.) are hung on the scale. A smaller weight on a slide bar (much like the old doctor’s scale) or a threaded rod is used for fine adjustment &/or taring the bag. Mechanical scales are activated by a pull lever.

Mechanical bagging scales:

  1. are less expensive
  2. are easy to set up
  3. require no electricity or compressed air
  4. typically used for free-flowing products such as grain, seed, fertilizers, or plastic pellets.

Digital Bagging ScalesHamer 100GW Digital Gross Weigh Scale
Digital scales use load cells to measure the weight of the product. “A load cell is a transducer that creates an electrical signal whose magnitude is directly proportional to the force being measured”(1). Digital scales have a digital display and a PLC (programmable logic controller) that is used to control the scale’s operation (i.e. open/close feed gates, clamp/unclamp bags). In addition, multiple product weight parameters can be stored allowing for easily changing bag sizes. Digital scales are activated by a whisker switch or start button.

Digital bagging scales:

  1. are more expensive
  2. are more precise
  3. require electricity (may require compressed air depending on options)
  4. can store weight programs & transmit data

(1) Wikipedia. org-Load Cell