Technische Änderungen vorbehalten
4.5
What must be programmed when connecting the relay outputs?
Relay function can only be adjusted if the instrument was ordered with the option relay con-
tacts (TD 8250-R ..).
The relays can be allocated to flow rate or volume measurement.
Flow rate measurement:
A
“0”
is inserted under the menu reference
“07”
. This takes place at the position desig-
nated
“Display”
(
§ 4.1 "Overview of the input values").
Volumetric measurement:
A
“1”
is inserted under the menu reference
“07”
. This takes place at the position desig-
nated
“Display”
(
§ 4.1 "Overview of the input values").
4.5.1
Switch functions
For Relay 1, programming takes place under the menu references
“03”
and
“04”
, for Relay 2
under the menu references
“05”
and
“06”
(
§ 4.1 "Overview of the input values").
The following switch functions can be obtained.
Normally-open function::
On reaching the switch-on value the contact is closed.
Example: Switch-on value (pull-in):
2.500
Switch-off
value
(drop-out):
9999
The relay contact is switched when the switch-on value is exceeded. The switch-off value of
9999
has the consequence, that only the switch-on value is evaluated. The relay is not dis-
connected when the switch-off value is reached.
Normally-closed function:
On reaching the switch-off value the contact is opened.
Example: Switch-on value: 0.000
Switch-off
value:
3.000
The relay contact is switched so long as the switch-off value is not reached. The switch-on
value of
0.000
has the consequence, that only the switch-off value is evaluated. The relay is
not switched-off if the switch-on value is reached.
Window function:
Example: Switch-on value: 2.500
Switch-off
value:
3.000
The relay contact is switched when the switching value is reached. If the switch-off value ex-
ceeded the relay opens again.
Hysteresis switch:
The relay contact is switched when the switch-on value is reached. If the switch-off value is
exceeded, the relay opens again.
Example: Switch-on value: 4.000
Switch-off
value:
3.000
