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Note
Adjustment is always based on the closed re-
striction.
Note
Observe the differential pressure across the
restriction ∆p
restriction
is determined by the differential pressure
springs installed in the actuator (see the
'Markings on the device' section).
Note
For special versions with a scaled cap, the
limit can be adjusted directly using the
scaled cap (one marked scale division corre-
sponds to one turn of the set point screw).
Î To determine the flow limitation to be ad-
justed, the differential pressure across the
restriction must be added to the known
pressure drop across the plant. From ex-
perience, the differential pressure at the
restriction is assumed to be 0.2 bar.
Î Fig. 7-1 shows an example of flow rate
adjustment.
EB 3132-3 EN
of 0.2 bar or 0.5 bar. It
7.3 Adjusting the temperature
Adjust the set point by turning the black
plastic ring (set point adjuster, 22) while
watching the reference thermometer installed
in the plant (u EB 2430).
1. Turn clockwise () to reduce the tem-
perature
Turn counterclockwise () to increase the
temperature
2. Guide the wire through the lead-seal
hole (26) at the control thermostat and
lead-seal it to fix the adjusted tempera-
ture.
Example: flow rate adjustment
The Type 2479/2430 Regulator, DN 15,
flow rate range K
VS
to be used to limit the flow rate in the plant
to 0.63 m³/h. The pressure loss across the
plant is 0.4 bar.
To which value is the flow set point to be lim-
ited and how many turns of the set point ad-
juster (22) are required to adjust the restric-
tion?
Operation
= 0.25 to 0.64 m³/h is
7-3
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