User Manual

2 / 6
Siemens Flow switch QVE1902.0.. CM1N1596en
Building Technologies 2017-02-16
Type summary
Type / ASN Order number (SSN) Name
QVE1902.010
S55720-S199 Flow switch
QVE1902.015
S55720-S200 Flow switch
QVE1902.020
S55720-S201 Flow switch
QVE1902.025
S55720-S202 Flow switch
Ordering
When ordering, please specify the quantity, type, and product name.
Sizing
Switching value table for water at 20 °C
Type (ASN) DN
Threading
[inch]
Q
max
[l/min]
Factory setting (range) [l/min]
QVE1902.010 DN 10 ⅜ 20 3.2 (2.8…3.7) 2.7 (2.0…3.4 3.6 (3.1…4.1)
QVE1902.015 DN 15 ½ 30 4.2 (3.6…4.9) 3.4 (2.8…4.0) 4.4 (3.7…5.1)
QVE1902.020 DN 20 ¾ 80 7.6 (6.9…8.4) 7.1 (6.1…8.2) 8.7 (8.0…9.5)
QVE1902.025 DN 25 1 130 12.0 (10.8…13.3) 10.5 (8.9…12.1) 13.1 (12.0…14.3)
Engineering notes
· The flow switch QVE1902.0xx is not a safety component in terms of Directive
2006-42-EC.
· Operational safety of the supplied device is only guaranteed when used properly
(monitoring the flow of liquids). Under no circumstances may the indicated limit
values (see "Technical data") be exceeded.
· You must ensure that the materials used in the flow switch are sufficiently
chemically and mechanically durable against the medium to be monitored as
well as external influences.
· Comply with maximum contact load for the reed contact. The maximum contact
load indicated on the type label applies to Ohm loads only and may not be
exceeded under any circumstances.
High voltage or current spikes may occur when switching, in particular, inductive
or capacitive loads (e.g. relay coils, capacitors). Even a short overload may
destroy (fusing of contacts) or damage (reduced life cycle) reed contacts.
Use appropriate and tested safety measures.
· Select suitable measures to prevent the medium from freezing.
Do not operate, e.g. testing, the flow switch using pure water if operated in
ambient temperatures of <4°C. Residual water in the flow switch may result in
frost damage.
Warning
Caution