West Control Solutions KS98-1 - Manual (Page 278)

Example 3:
zero and gain matching
x1in = 100°C x1out = 100°C - 2,0°C
x2in = 300°C x2out = 300°C + 1,5°C
The corrected values are shifted already at values
x1in and x1out and diverge additionally.
Sensor types
The input sensor type can be determined as thermocouple, resistance thermometer, potentiometric transducer or as
standard signal (current and voltage). The physical quantity is freely selectable.
Input thermocouple
The following thermocouple types are configurable as standard:
Type L, J, K, N, S, R, T, W, E and B according to IEC584.
The signal behaviour can be affected by the configuration of the following points. Distinction between internal and ex -
ternal temperature compensation (r
STK) is made.
w Internal compensation:
the compensating lead must be taken up to the multi-function unit connecting terminals. No lead resistance ad -
justment is required.
w External temperature compensation:
A separate cold-junction reference with a fixed reference temperature must be used (between 0 and 140°C
configurable) (r
Tkref). The compensating lead must be taken only up to the cold-junction reference, the cable
between reference and multi-function unit terminals can be of copper. No lead resistance adjustment is necessary.
w The action of the built-in TC break protection can be configured for upscale ( << process value) or
downscale ( >> process value) or fixed to a substitute value (r Fail).
w For measured value processing, a filter time constant with a numeric value between 0,0
and 200000 is adjustable (r
Tfm).
w A process value correction is configurable (r Xkorr).
Resistance thermometer input
Resistance thermometer, temperature difference
With a resistance thermometer, the signal behaviour with sensor break can be determined
(r
Fail). No temperature compensation is required and is therefore switched off. With temperature difference
measurement, calibration by means of short circuit is required. If lead resistance adjustment is necessary, it can be re-
alized by means of a 10
W calibrating resistor (order no. 9404 209 10101). Dependent of signal source type, the unit is
configured for one of the following inputs:
w resistance thermometer Pt 100 with linearization
w temperature difference with 2 x Pt 100 and linearization
w linear potentiometric transducer
For measured value processing, a filter time constant with a numeric value within 0 and 999 999 can be adjusted ( r
Tfm). Process value correction can be configured (r Xkorr).
9499-040-82711 Inputs
AINP1 ( analog input 1 (No. 08)) III-278
X2out
X2in
X1out
X1in
korrigierte Kennlinie
Eingangs-Kennlinie
corrected characteristic
input characteristic
Fig. 100