5.15 S7, S8, S9, S10 pressure
Pressure measuring
The pressures at S7, S8, S9 and S10 are measured by means of
pressure transmitters, all giving a 0 - 10 volt signal in relation to
the measured pressure.
Alternatively, other pressure transmitter types can give a 4 - 20 mA
signal in relation to the measured pressure.
As described in the section "Electrical connections, Pt 1000
temperature sensors and signals" the 4 - 20 mA can be sent through
(for example) a 500 ohm resistor in order to convert the current
signal to a voltage signal. (4 - 20 mA through a resistor of 500 ohm
gives a voltage of 2 - 10 volt).
In this section the set-up procedure for pressure transmitters S7,
S8, S9 and S10 is described commonly.
Overview, pressures in an A333 application:
Name:
Place:
Description:
S7
Primary supply
for monitoring purpose
S8
Primary return
for monitoring purpose
S9
Secondary flow
mandatory for circulation
pump control
S10
Secondary return
mandatory for refill water
function and circulation
pump control
VI.GU.T2.02
© Danfoss | 2017.09 | 121
Operating Guide ECL Comfort 310, application A333
