techem ultra S3 Operating Instructions Manual page 12

Environmental conditions
• Installation: Sufficient spacing (250 mm) between the computer unit and possible sour-
ces of electromagnetic interference • Do not connect to the building's earthing • Choose
a dry, easily accessible place
• Operation: 5...55°C • IP 54 (computer unit and flow rate sensor) • < 93 % rel. humidity
Installation
General installation instructions
Ö Observe the environmental conditions!
Ö Note the cable lengths: Volume measuring section: max. 10m (use shielded cable),
Temperature sensor: standard 2 m, special version 10 m.
• Do not carry out any welding, soldering or drilling work in the vicinity of the meter.
• Only install meters in operational systems.
• Protect meters against damage from impacts or vibration. When commissioning, open
the shut-off valves slowly.
• Install the volume measuring section isolated from the power supply.
Ensure that the pipes leading to and from the volume measuring section are properly
secured and supported.
Volume measuring section / computer unit installation
• The flow direction can be recognised from the arrows on the electronics housing.
• Meters normally neither need a straight inlet nor a straight outlet pipework run.
!
Only install the heat meter in the section for which it is constructed - the outlet
variant in the low temperature section (outlet) and the inlet variant in the high
temperature section (inlet)
Suitable and unsuitable installation locations 
A, B: OK,
C: not OK - air accumulation in the volume measuring section.
Installation at a high point only if a bleeding option exists.
No installation at a low point!
D: Only OK in closed systems
E: not OK - directly after a restriction or a reducing component
F: not OK - too close to the suction side of a pump
G: not OK - after a bypass loop in two levels
• Observe: Distance ≥ 50 cm between the computer unit and possible sources of
electromagnetic interference.
• If there are several meters in one unit: Observe identical installation conditions!
When installing the volume measuring section in the shared outlet of two circuits:
Minimum distance from the junction (T-piece): 10 x DN.
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