Division value
The division value on the measuring scale of the water metre.
The division price is the minimum measurement step, the difference between two adjacent smallest units, in other words, the smallest difference in readings that the metre can display. The smaller this difference, the more detailed data the device produces. For example, a value of 0.01 m³ allows you to display data with an accuracy of the second decimal place — that is, such a metre will show, for example, a change in the amount of water consumed from 0.02 m³ to 0.03 m³, but will not perceive the difference between 0.022 m³ and 0.028 m³ (readings will remain at the level of 0.02 m³). However, modern water metres — even household ones — for the most part, have a lower division price, from 0.001 m³ and below.
Dimensions
General water metre dimensions in length, depth and height. Sometimes only one size can be indicated in this paragraph — the length: it is most important during installation, it is the length that is taken into account when choosing the required distance between the ends of the pipes. At the same time, it is worth remembering that between these ends, not only the metre itself is most often located, but also other devices and parts: connecting fittings, a valve, a coarse filter, a check valve, etc. Details on this can be found in special sources; here we note that for some models, the specifications separately indicate the length with complete mounting fittings (see below). Without fittings, the length can be from
80 – 100 mm in the most compact devices to
250 mm or more in the largest.
Depth and height, in turn, allow you to estimate how much free space around the pipe is needed for the normal placement of the metre.
Length with fittings
The length of the water metre with complete mounting fittings installed on it.
The fittings are used when installing models with a threaded connection (see "Connection"). They are short pipes screwed onto the inlet and outlet of the metre and play the role of a kind of adapter between the device and other elements of the system (for example, a coarse filter and a check valve for a traditional household metre). Knowing the length with fittings installed, it is easier to calculate the required distance between the ends of the pipes: when calculating, you do not need to separately take into account the length of the fittings, they are already taken into account in this size.
Protective cover
The presence of a special
protective cover on the water metre scale. Usually, such a cover is closed, it is opened only to check the readings. Such a detail protects, first of all, the transparent plastic with which the scale is covered — from bumps, scratches and dirt; thanks to this, the plastic remains transparent for a long time, does not become foggy and does not interfere with reading data from the scale. However, the role of the cover is not limited to this, it often provides additional protection for the case as a whole; and in some models, sensors are mounted in the cover to transmit data from the metre, used in remote control systems. Note that all these functions can be provided both in industrial and household metres (see "Type").
