Definitions of measuring devices for type approval
Only certain types of measuring devices can be submitted for type approval. Use the following definitions to understand how your measuring device is classified so that you submit an accurate type approval application.
Dimension measuring devices
- Area measuring device:
- This device measures the area of an object such as carpeting.
- Linear measuring device:
- This device measures the length of an object such as rope or wire.
- Multiple dimension measuring device:
- This device measures the dimensions and/or volume of an object by calculating the smallest cuboidal shape in which the object may be placed for the purpose of calculating freight, storage or postal charges.
- Timber dimension measuring device:
- This device measures the dimensions of a tree stem or log in order to determine its area, diameter, length and/or volume.
Scales and scale components
- Bench scale:
- This type of scale does not calculate price and is typically small enough to be placed on a bench or work station.
- Conveyor belt scale:
- This type of scale is installed as part of a conveyor belt to weigh a product while it is moved on the conveyor. The product, such as bulk gravel, cement, sugar or other, is transported and weighed at the same time. These are often installed as part of a material handling system for loading trucks, rail cars or ships with bulk material.
- Crane scale:
- This type of scale is mounted on cranes or A-frames and is designed to weigh suspended objects. They are often used to weigh rolls, bars or plates of steel, bundles of logs, hoppers of bulk material or weigh recyclable material at scrap metal facilities.
- Hopper scale:
- This type of scale is commonly used to measure bulk commodities and is located in industrial businesses to weigh items such as cement, gravel, ore, fertilizer and grain. A transaction may consist of multiple measurements added together to determine a total weight which exceeds the capacity of the scale. For hopper scales permanently fixed to a vehicle, see Vehicle scales.
- On-board weighing scale:
- This type of scale is mounted on a vehicle to measure the loaded weight using load cell technology or pressure readings of the suspension.
- Overhead scale:
- This type of scale is installed as part of an overhead rail system to weigh the product as it is carried on overhead rails, e.g. scales used to measure carcasses in meat packing facilities.
- Platform scale:
- This type of scale does not calculate price, and is used for weighing many items ranging from light to heavy. They come in many shapes and sizes and are designed to weigh precious metals, packages, freight, etc. For scales specifically designed to weigh road vehicles, see Vehicle scales.
- Railway scale:
- This type of scale is used exclusively for weighing trains. It is designed to weigh individual rail cars or entire trains while stationary or while passing over the scale deck at a controlled speed.
- Vehicle scale:
- This type of scale is used to weigh a variety of highway, farm or other large scale industrial vehicles. This does not include railway freight cars.
Indicating element only
- Indicating element:
- This is a module that can perform metrological functions and indicate weight values, but does not include a load receiving element. It forms a weighing device when interfaced with a weighing and load receiving element.
Load receiving element only
- Load receiving element:
- Load receiving element: This is a module to which a load is applied, but it does not indicate the weight value. It forms a measuring device when interfaced with an indicating element.
Volumetric liquid measuring devices
Complete measuring systems
- Aircraft refuelling system:
- This is a vehicle mounted or fixed (hydrant) aircraft refuelling and defuelling system.
- This is a gasoline pump/meter used to sell motor vehicle fuels (e.g. gas, diesel, propane) at retail stations. They typically have price computing capabilities.
- Milk measuring system:
- This is a milk receiving system installed at dairy plants or a vehicle mounted milk pick-up metering system of either pressure or vacuum air elimination type.
- These are systems designed to deliver large quantities of fuel (e.g. gas, diesel, propane), normally into transport trucks and other large vehicles, generally for retail purposes. They are commonly found at truck stops.
- Truck mounted measuring system:
- This is a metering system installed on vehicles incorporating pumping equipment used for the measurement of petroleum products, chemicals, herbicides, pesticides or, lubricants and other products which are liquid at ambient temperature and pressure.
Measuring system components
- Electronic register and flow computer:
- This device incorporates electronic components in order to process signals from the meter, temperature transducer and pressure transducer that correspond to measured quantities.
- Flow Meters (Bulk meter):
- These meters are large capacity meters used to measure large quantities of liquids, typically into tanks on fuel delivery trucks or rail cars or in high speed dispensers and refuellers. They are also used for the bulk measurement of other liquids and chemicals in various trade sectors.
- Mechanical register:
- This device incorporates mechanical components linked to the moving elements of a meter in order to process the output corresponding to measured quantities.
- Pressure transducer:
- This device provides a signal output of known relationship with the applied pressure for use with metering assemblies incorporating automatic pressure compensators which cause the registration of a meter to be in pressure compensated units of volume.
- Temperature transducer:
- This device provides a signal output of known relationship with the flowing temperature for use with metering assemblies incorporating automatic temperature compensators which cause the registration of a meter to be in temperature compensated units of volume.
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