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Specifications
9.6
Measuring accuracy
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Reference conditions according to IEC 60770
•
Ambient temperature T
= constant, in range: 18 ... 30 °C
U
(64 ... 86 °F)
•
Relative humidity = constant, in range: 30 ... 80 %
•
Atmospheric pressure P
U
•
Position of measuring cell: vertical ±1 °
•
Span based on zero position
•
Isolating diaphragm material: Ceramic (Al
TM
Hastelloy C276
•
Sensor filling liquid: Silicone oil (sensors > 2.5 bar)
•
Supply voltage: 24 V DC
•
Load with HART: 250 Ω
•
Transmitter not grounded
•
Characteristic setting: linear, 4 ... 20 mA
Unless otherwise specified, 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).
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9.7
Operating influences
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Thermal change in ambient temperature
as regards zero signal and span (turndown up to 15:1),
in relation to the set span
Area
Maximum effect on zero signal and span
-10 ... 60 °C
Sensor code C, F:
(14 ... 140 °F)
± (0.08 % x TD + 0.08 %)
Sensor code C, F (abs.)
± (0.20 % x TD + 0.10 %)
Sensor code L, D, U, R, V:
± (0.06 % x TD + 0.06 %)
-40 ... -10 °C
Sensor code C, F:
(-40 ... 14 °F) and
± (0.04 % / 10 K x TD + 0.05 % / 10 K)
60 ... 80 °C
Sensor code C, F (abs.):
(140 ... 176 °F)
± (0.10 % / 10 K x TD + 0.05 % / 10 K)
Sensor code L, D, U, R, V:
±(0.04 % / 10 K x TD + 0.04 % / 10 K)
Power supply
Within the specified limits for the voltage / load, the total influence is
less than 0.001 % of the upper measuring range limit per volt.
Load
Within the specified load / voltage limits, the total influence is
negligible.
Electromagnetic fields
Total effect: less than 0.05 % of span from 80 ... 1,000 MHz and for
field strengths up to 10 V/m when tested with unshielded conduit, with
or without meter.
Mounting position
Nominal position: vertical; process connection at bottom.
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74
= constant, in range: 950 ... 1,060 mbar
O
, gold-coated, or
)
2
3
IMPORTANT (NOTE)
Select the transmitter sensor with the smallest possible
turndown. This optimizes the accuracy of the measurement.
Dynamic response (according to IEC 61298-1)
Devices with standard configurations and a turndown of up to 30:1,
plus linear output characteristics.
Reaction time:
Time constant (63 %)
Measuring error (for setting cut-off point)
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.
Turndown
1:1 to 10:1
>10:1
The filling fluid of the measuring equipment affects the position if the
mounting position differs. If the deviation is 90° from the nominal
position and silicone oil is used as the filling fluid, this equates to
2.14 mbar + 0.02 mbar/10K.
Long-term stability
±(0.05 x TD) % / year
±(0.15 x TD) % / 5 years
Vibration effect
±(0.10 x TD) % acc. to IEC 61298-3.
Total performance
Similar to DIN 16086
In the range -10 ... 60 °C (14 ... 140 °F), in relation to the set span
(TD 1:1):
Sensor code C, F:
Sensor code C, F (abs.):
Sensor code L, D, U, R, V:
The total performance accuracy includes the measuring error (non-
linearity including hysteresis and non-reproducibility), as well as the
thermal change in the ambient temperature as regards the zero signal
and span.
E
E
perf
1
E
= Total performance
per
f
E
= Effect of the ambient temperature on the zero signal
1
E
2
= Effect of the ambient temperature on the span
E
= Measurement deviation (for setting cut-off point)
lin
265Gx, 265Ax
30 ms
150 ms (for all sensors)
Measuring error
±0.04 %
± (0.04 + 0.005 x TD - 0.05) %
± 0.16 %
± 0.30 %
± 0.13 %
2
2
E
E
2
lin
IM/265Gx/Ax-EN-07
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