Technical data Deltabar FMD71, FMD72
118 Endress+Hauser
15.3 Performance characteristics of ceramic process
isolating diaphragm
15.3.1 Reference operating conditions
• As per IEC 60770
• Ambient temperature T
A
= constant, in the range of:+21 to +33 °C (+70 to +91 °F)
•
Humidity j= constant, in the range of: 5 to 80 % RH
• Ambient pressure p
A
= constant, in the range of:860 to 1 060 mbar (12.47 to 15.37 psi)
• Position of measuring cell = constant, in range: horizontal ±1° (see also "Influence of the
installation position" section → 118)
• Input of Lo Trim Sensor and Hi Trim Sensor for lower range value and upper range value
• Zero based span
• Material of process isolating diaphragm: Al
2
O
3
(aluminum-oxide ceramic, Ceraphire
®
)
• Supply voltage: 24 V DC ±3 V DC
• Load with HART: 250 Ω
15.3.2 Influence of the installation position depending on sensor
A0016465
Process isolating diaphragm axis is horizontal (A) Process isolating diaphragm pointing
upwards (B)
Process isolating diaphragm pointing
downwards (C)
Calibration position, no measuring error < +0.2 mbar (+0.003 psi) < –0.2 mbar (–0.003 psi)
This effect can be corrected using the function to adjust the position (position adjustment)
for the differential pressure. Additional position adjustments for individual pressure
signals are not available.
A position-dependent zero shift can be corrected on the device.
15.3.3 Resolution
• Current output: 1 μA
• Display: can be set (factory setting: presentation of the maximum accuracy of the
transmitter)
15.3.4 Vibration effects
Test standard Vibration effects
IEC 61298-3 ≤ Reference accuracy up to 10 to 60 Hz: ±0.35 mm (±0.01 in); 60 to 500 Hz: 2 g
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