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71
10 Supplement
WIKA Operating Instructions - Differential pressure transmitter DPT-20
Measuring range
Up to nominal pressure
13)
-40 … +80 °C / -40 … +176 °F
10 mbar (1 kPa)/0.145 psi
40 bar (4000 kPa)
< ±0.5 %
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
Influence of the static pressure
The values apply to the
digital
signal output (HART, Profibus PA, Foundation Fieldbus) as well as
to the
analogue
current output 4 … 20 mA and refer to the set span. Turn down (TD) is the ratio
"nominal measuring range/set span".
Change zero signal and output span
Nominal range
Up to nominal pres-
sure
14)
Influence on the zero
point
Influence on the span
10 mbar (1 kPa),
(0.145 psi)
40 bar (4000 kPa),
(600 psi)
< ±0.10 % x TD
< ±0.10 %
30 mbar (3 kPa), (0.44 psi)
100 mbar (10 kPa),
(1.5 psi)
160 bar (16000 kPa),
(2400 psi)
400 bar (4000 kPa),
(5800 psi)
160 bar (16000 kPa),
(2400 psi):
< ±0.10 % x TD
400 bar(4000 kPa),
(5800 psi):
≤ 0.25 % x TD
160 bar(16000 kPa),
(2400 psi):
< ±0.10 %
400 bar(4000 kPa),
(5800 psi):
≤ 0.25 %
500 mbar (50 kPa),
(7.3 psi)
3 bar (300 kPa),
(43.51 psi)
16 bar (1600 kPa),
(232.1 psi)
Long-term stability (according to DIN 16086)
Applies to the respective
digital
signal output (HART, Profibus PA, Foundation Fieldbus) as well as
to the
analogue
current output 4 … 20 mA under reference conditions. Turn down (TD) is the ratio
"nominal measuring range/set span".
The long-term stability of the zero signal and output span corresponds to the value F
Stab
in chapter "
Calculation of the total deviation (according to DIN 16086)
".
Long-term stability zero signal and output span
Measured variable
Time range
1 year
5 years
10 years
Differential pressure
15)
< 0.065 % x TD
< 0.1 % x TD
< 0.15 % x TD
Static pressure
16)
< ±0.065 %
< ±0.1 %
< ±0.15 %
13)
Measuring range end, absolute pressure.
14)
Measuring range end, absolute pressure.
15)
Relating to the adjusted span.
16)
Relating to the measuring range end value.