West Control Solutions TB 45 Temperature Limiter - Manual (Page 22)

6.1.2 Temperature monitor
The selected temperature monitor function monitors the process value. When the process value is above the adjusted
high limit value LC or below the adjusted low limit value LC (configurable), output relay LC is opened and disabled.
Release is automatic, when
– the process value is below the adjusted high limit value LC (minus any adjusted hysteresis) again with setting
”Temperature monitor max.”, or when the process value is above the adjusted low limit value LC (plus any
adjusted hysteresis) again with setting “Temperature monitor min.”.
a
Please, note that the adjusted filter time t.F1 can increase the response time for the process value. The
DIN-tested response times were tested with t.F1 = 0,5 s.
Limit values Lim.2, Lim.3 can be used as pre-alarms for (optional) output on OUT.2, OUT.3.
6.1.3 Limit signaller
A selected limit signalling function monitors the process value. When exceeding the adjusted limit values L.1 / H.1 ,
output relay LC is opened (see also chapter Limit values!)
Limit values Lim.2, Lim.3 can be used as pre-alarms for (optional) output on Out.2, Out.3.
6.2 Linearization
The input values of input INP1 can be linearized via a table (dependent from adjusted sensor type S.tYP).
By means of tables, e.g. special linearizations for thermocouples or other non-linear input signals, e.g. a container fill-
ing curve, are possible.
The “ Lin” table is always accessed, when at INP1 with sensortype S.TYP= 18: “special thermocouple” or with
linearization S.Lin= 1: “special linearization” is selected .
• The input signals must be specified in mV, V, mA, % or Ohm dependent on input type.
•
For special thermocouples (S.tYP = 18), specify the input values in
μV, and the output values in the temperature
unit adjusted in U.LinT .
• For special resistance thermometer (KTY 11-6) (S.tYP = 23), specify the input values in Ohm, and the output
values in the temperature unit adjusted in U.LinT.
Non-linear signals can be linearized using up to 16 segment points. Each segment point comprises an input ( In.1 …
In.16) and an output (Ou.1 … Ou.16). These segment points are interconnected automatically by straight lines.
The straight line between the first two segment points is extended downwards and the straight line between the two
highest segment points is extended upwards, i.e. a defined output value for each input value is provided.
With an In.x value switched to OFF,all further segments are switched off.
+
Condition for the input values is an ascending order.
In.1 < In.2 < ...< In.16.
g
For linearization of special thermocouples, the ambient temperature range should be defined exactly,
becauseit is used to derive the internal temperature compensation.
g
See also page 38.
Functions
22 Linearization TB 45