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8.1. Sealing
Elf heat meters are sealed with self-adhesive seals to prevent unauthorised access to the electronic
circuit – see the figure below.
The enclosure base is sealed together with the enclosure with a sealing wire threaded through the holes
in the band clip. Once closed, the complete enclosure is sealed with stickers made of a special film which
brittles when peeled. The seals are located on the fastening screw and on the mating line between the
base and the housing body.
The interface body is also sealed with a sticker – see section 7 and the respective figure. The technical se-
rvice of the user is allowed to remove the sticker when installing the interfaces. Once the interfaces have
been commissioned, it is recommended to apply a service seal or an Apator-Powogaz branded sticker.
Seal the heat meter connections on both lines with the same sealing wire threaded through the holes
in the threaded connections and through the special lug on the flow transducer body – see the figure in
the previous section.
8.2. Electrical interference
Elf heat meters do not require special electrical interference protection; however, electromagnetic inter-
ference must be avoided. The sensor wiring must not lay directly at power cables, or other high-power
electrical devices. Do not cut, extend or shorten the wires of measurement sensors. The wiring of
additional pulse inputs must be as short as possible; the wire length of passive pulsers (dry with open
collector) must not exceed 10 m – if extension is necessary, make it with an additional terminal strip
located in a junction box.
If transmission network interfaces are used, especially when the wires are routed outside of the bu-
ilding, use increased protection against electrical interference. Detailed information is available from
competent Apator-Powogaz personnel.
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