Technical data
72 265Dx, 265VS IM/265D/V-EN-02
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10.5 Measuring accuracy
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Reference conditions acc. to IEC 60770
• Ambient temperature T
U = constant, in range: 18 ... 30 °C
(64 ... 86 °F)
• Relative humidity = constant, in range: 30 ... 80 %
• Atmospheric pressure P
U = constant, in range: 950 ... 1,060 mbar
•
Position of measuring cell (isolating diaphragm areas): Vertical ±1 °
• Span based on zero position
• Isolating diaphragm material: Hastelloy C276
TM
• Filling liquid: Silicone oil
• Supply voltage: 24 VDC
• Load with HART: 250 Ω
• Transmitter not grounded
• Characteristic setting: Linear, 4 ... 20 mA
Unless otherwise specified:
- The reference conditions apply for the following performance
characteristics.
- Errors are given as a percentage of the span value.
The accuracy of the measurement in relation to the upper range limit
(URL) is affected by the turndown (TD); i.e., the ratio of the upper
range limit (URL) to the set span (URL/span).
Important
Select the transmitter sensor with the smallest possible
turndown. This optimizes the accuracy of the measurement.
Dynamic behavior (according to IEC 61298-1)
Devices with standard configurations and a turndown of up to 30:1,
plus linear output characteristics.
Reaction time: 30 ms
Time constant (63 %) 150 ms (sensors F to R)
400 ms (sensor C)
1,000 ms (sensor A)
Measuring error (for terminal based conformity)
Percentage of set span, consisting of non-linearity, hysteresis, and
non-reproducibility.
In the case of fieldbus devices, SPAN refers to the analog input
function block output scale range.
Measuring error for differential pressure sensor (265Dx/265Vx)
Turndown Measuring error
1:1 to 10:1 ± 0.04 %
>10:1 ± (0.04 + 0.005 x TD - 0.05) %
Measuring error for absolute pressure sensor (265Dx)
Measuring error
-
80 kPa, 800 mbar, 321 in H
2
O
For sensor code A with
absolute pressure sensor
0.6 kPa, 6 bar, 87 psi
1.2 kPa, 12 mbar, 4.8 in H
2
O
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10.6 Operating influences
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10.6.1 Operating influences 265Dx
Thermal change in ambient temperature on the zero signal and
span (turndown up to 15:1), in relation to the set span.
Differential pressure sensor:
Range Maximum effect on zero signal and span
-10 ... 60 °C
(14 ... 140 °F)
± (0.06 % x TD + 0.05 %)
-40 ... -10 °C
(-40 ... 14 °F) and
60 ... 80 °C
(140 ... 176 °F)
± (0.025 % / 10 K x TD + 0.03 % / 10 K)
Absolute pressure sensor
For the entire temperature range of 120 K
–
Zero signal
For sensors C, F, L, N, R:
40 kPa, 400 mbar, 160 in H
2
O
(absolute pressure sensor 41 MPa, 410 bar, 5,945 psi)
For sensor A:
0.6 kPa, 6 mbar, 2.4 in H
2
O
(absolute pressure sensor 0.6 MPa, 6 bar, 87 psi)
–
Span
For sensors C, F, L, N, R:
0.3 kPa, 3 bar, 43.5 psi
(absolute pressure sensor 41 MPa, 410 bar, 5,945 psi)
For sensor A:
4.5 kPa, 45 mbar, 18 in H
2
O
(absolute pressure sensor 0.6 MPa, 6 bar, 87 psi)
Static pressure (zero signal errors may be calibrated out at
operating pressure)
Measur-
ing range
Sensor A Sensor
C, F, L, N
Sensor R
Up to 2 bar:
0.05 % URL
Up to 100 bar:
0.05 % URL
Up to 100 bar:
0.1 % URL
Zero
signal
> 2 bar: 0.05 %
URL/bar
> 100 bar: 0.05 %
URL/100 bar
> 100 bar: 0.1 %
URL/100 bar
Up to 2 bar:
0.05 % span
Up to 100 bar:
0.05 % span
Up to 100 bar:
0.1 % span
Span
> 2 bar: 0.05
span/bar
> 100 bar: 0.05 %
span/100 bar
> 100 bar: 0.1 %
span/100 bar
Power supply
Within the specified limits for the voltage/load, the total effect is less
than 0.001 % of the upper range limit per volt.
Load
Within the specified load/voltage limits, the total effect is negligible.
Electromagnetic fields
Total effect: Less than 0.05 % of span between 80 and 1,000 MHz
and at field strengths of up to 10 V/m, when tested with unshielded
cables, and either with or without a display.
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