69
10 Supplement
WIKA Operating Instructions - Differential pressure transmitter DPT-20
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
Calibration position of the measuring cell
Vertical, i.e. upright process component
Influence of the installation position
<0.35 mbar/20 Pa (0.003 psig) 10° inclination each
around the transverse axis
Material, lateral flanges
316L
Deviation at the current output due to strong, high-frequency electromagnetic fields
Ʋ
In accordance with EN 61326-1
< ±80 µA
Ʋ In accordance with IACS E10 (ship
-
building)/IEC 60945
<= ±160 µA
Deviation determined according to the limit point method according to IEC 60770 or
IEC 61298
The measurement deviation includes the non-linearity, hysteresis and non-reproducibility.
The values apply to the
digital
signal output (HART, Profibus PA, Foundation Fieldbus) as well
as to the
analogue
current output 4 … 20 mA. For differential pressure they refer to the set span,
for static pressure to the measuring range final value. Turn down (TD) is the ratio of the nominal
measuring range to the set span.
Differential pressure
Measuring range
TD ≤ 5 : 1
TD > 5 : 1
TD > 10 : 1
10 mbar (1 kPa)/0.145 psi
< ±0.1 %
< ±0.02 % x TD
30 mbar (3 kPa)/0.44 psi
100 mbar (10 kPa)/1.5 psi
< ±0.065 %
< ±0.035 % + 0.01 % x TD
500 mbar (50 kPa)/7.3 psi
3 bar (300 kPa)/43.51 psi
< ±0.015 % + 0.005 % x TD
16 bar (1600 kPa)/232.1 psi
< ±0.035 % + 0.01 % x TD
Static pressure
Measuring range
Up to nominal pressure
8)
TD 1:1
10 mbar (1 kPa)/0.145 psi
40 bar (4000 kPa)
< ±0.1 %
30 mbar (3 kPa)/0.44 psi
100 mbar (10 kPa)/1.5 psi
160 bar (16000 kPa)
resp.
400 bar (40000 kPa)
500 mbar (50 kPa)/7.3 psi
3 bar (300 kPa)/43.51 psi
16 bar (1600 kPa)/232.1 psi
Flow > 50 %
9)
8)
Measuring range end, absolute pressure
9)
Root characteristic
