Manual FLOW 38 Page 22 (total 54) COMAC CAL s.r.o.
The external button to reset the user volume Vnull
External zeroing (Reset)
Zeroing the user volumetric counter is led out to the external input PIN9 and PIN10. The input is isolated
by an optocoupler. It can be managed by an external zeroing button is connected to terminals 9 and 10.
Jumper and terminal board wiring connection:
Data output
The meter can also be provided with RS485 communication with M-Bus protocol as per EN 1434-3 or
ModBus RTU.
Protection degree
The meters meet all the requirements for IP 65 protection degree. In order to ensure IP 65 protection
after installation in the plant or after a service intervention, the following must me met:
- The "O" rings inserted in sealing grooves must be clean and intact.
- If necessary, the "O" rings should be dried, cleaned or replaced with new ones.
- Screw caps must be tightened properly.
- Cables used for connection must have their outside diameters according to cable entries used.
- Tighten the cable entries properly.
- Cables before entering the cable entries should form a loop pointing downwards ("drip loop").
This will eliminate the penetration of moisture into the cable entry. Install the measuring
instrument always with cable entries not facing upwards if it is possible.
- Provide all unused cable entries with dummy plugs.
- Do not remove sealing rings from the cable entries.
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