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Maintenance
If operated in comtaminated or calcareous
water deposits can build up, which can
lead to measuring errors. Thus it may be
necessary to clean the section of the sensor
through which the liquid passes. The metal
surface may not be damaged.
Electrical connection (S175)
Operation
The inline flow sensors have front panel
buttons for setting functions to display set-
tings. All values are indicated via the
3-digit 7-segment display.
Button [S1/-]:
After a short press of the but-
ton, the set limit value for switch point S1 is
indicated. In the programming mode, this
button can also be used to decrease the
indicated value.
Button [mA/+]:
After a short press of the
button, the actual current value in mA is
indicated. In the programming mode, this
button can also be used to increase the
indicated value.
Button [M]:
After a short press of the but-
ton, the measured temperature value in °C
is displayed for approx. 3 s.
In the programming mode, this button
can also be used to select functions and
parameters.
Programming
To enter the programming mode, press
buttons
[S1/-]
and
[mA/+]
for at least 3 s
until the display starts flashing. For a short
moment the character string
[Cod]
is dis-
played. Followed by the number
[0]
, which can be modified according to
the valid access code using buttons
[S1/-]
and
[mA/+]
. Use button
[M]
to select the
required parameter. After selection, the
parameter is displayed for approx. 2 s, follo-
wed by the associated value which
can now be modified. During entry it is
automatically verified whether the set pa-
rameter is admissible. Two decimal points
of the display will flash to warn against an
invalid entry. To terminate programming
and save all values press button
[M]
for at
least 3 s until the display stops flashing.
Access code [Cod]:
Without entry of an access code it is not
possible to set or modify device parame-
ters. The ex factory setting is “0”. This value
can be modified at the end of the program-
ming menu.
Unit of switch point S1 [USP]:
The switching output S1 may be used
for flow rate
[ L ]
or temperature monitor-
ing
[°C]
. Select
[°C]
to activate temperature
control. The value units depending on this
switch point will change accordingly.
Adjustable range switch point
S1 [SP]:
The switch point S1 is entered in l/min,
or – if required – in °C. The switch point
may be placed anywhere within the total
adjustable range (see page 10).
Hysteresis switch point S1 [hs]:
The hysteresis is the difference between
the switch-on value (which is identical to
the programmed switch point S1) and the
switch-off value. It is entered in l/min,
or – if required – in °C (see page 10).
Output switch point S1 [OU]:
The switching output S1 can be adjusted
either for the N.O. or N.C. mode.
Switch-on delay switch point
S1 [dS]
If it is not required to update the output
signal immediately after the switch point
S1 has been exceeded, this value can be
set in a range from 0…50 s. The signal will
then only be updated after the set time has
expired, provided the limit is still exceeded.
Switch-off delay switch point
S1 [dr]
If it is not required to update the output
signal immediately after the switch point S1
has been underranged, this value can be set
in a range from 0…50 s. The signal will then
only be updated after the set time has expi-
red, provided the limit is still underranged.
Average forming [nFi]
This parameter permits the entry of a value
which defines the time interval during
which a measuring value average is formed.
Values between 1…8 s can be entered.
A low value will lead to a fast response,
whereas a high value steadies the display of
the measuring value.
Medium selection [GLY]:
The flow sensor series FTCI is generally
suited for monitoring water circuits. If a
cooling circuit contains Glycol
(monoethyleneglycol), then this specific
contents can be entered as a percentage
in increments of 5 %. A possible measuring
value deviation is thus compensated.
Reference function [CAL]:
With this function, the displayed flow rate
value can be modified by ± 25 %. This can
be useful in order to adapt the display
exactly to a reference instrument.
Reset function [rES]:
Use the RESET function to set all values
back to the ex factory settings. For this,
the device must be disconnected from
power. Button
[M]
is then pressed during
re-connection. The character string
[rES]
is displayed. Then you will be prompted to
enter the access code. Press
[M]
to confirm
the entry and carry out the reset.
Analogue output:
The 4…20 mA analogue output provides
a current value that is proportional to the
flow rate over the total operating range.
Between 0 l/min and the minimum value
of the operating range, the output value
is 4 mA.
