59
10 Supplement
WIKA Operating Instructions - Process pressure transmitter CPT-2x
Reference conditions and influencing variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ
Temperature
+15 … +25 °C (+59 … +77 °F)
Ʋ
Relative humidity
45 … 75 %
Ʋ
Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Determination of characteristics
Limit point adjustment according to IEC 61298-2
Characteristic curve
Linear
Reference installation position
upright, diaphragm points downward
Influence of the installation position
< 0.2 mbar/20 Pa (0.003 psig)
Reference conditions and influencing variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ
Temperature
+15 … +25 °C (+59 … +77 °F)
Ʋ
Relative humidity
45 … 75 %
Ʋ
Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Determination of characteristics
Limit point adjustment according to IEC 61298-2
Characteristic curve
Linear
Reference installation position
upright, diaphragm points downward
Influence of the installation position
< 0.2 mbar/20 Pa (0.003 psig)
Deviation (according to IEC 60770-1)
Specifications refer to the set span. Turn down (TD) is the ratio: nominal measuring range/set span.
Accuracy class
Non-linearity, hysteresis and repeata-
bility with TD 1 : 1 up to 5 : 1
Non-linearity, hysteresis and repeata-
bility with 5 : 1
0.05 %
< 0.05 %
< 0.01 % x TD
0.1 %
< 0.1 %
< 0.02 % x TD
0.2 %
< 0.2 %
< 0.04 % x TD
Influence of the product temperature
Thermal change zero signal and output span through product temperature
Applies to the
digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to the ana-
logue
current output 4 … 20 mA and refers to the set span. Turn down (TD) is the ratio "nominal
measuring range/set span".
The thermal change of the zero signal and output span corresponds to the temperature error F
T
in
chapter "Calculation of the total deviation (according to DIN 16086)".
Basic temperature error F
T
