Deltabar FMD71, FMD72
Endress+Hauser 21
Performance characteristics of metallic process isolating
diaphragm
Reference operating
conditions
• As per IEC 60770
• Ambient temperature T
U
= constant, in the range of +21 to +33 °C (+70 to +91 °F)
•
Humidityj= constant, in the range of 5 to 80 % rH
• Ambient pressure p
A
= constant, in the range of860 to 1 060 mbar (12.47 to 15.37 psi)
• Position of the measuring cell = constant, in the range of horizontal ±1° (see also "Influence of the
installation position" section → 21)
• Input of Lo Trim Sensor and Hi Trim Sensor for lower range value and upper range value
• Zero based span
• Process isolating diaphragm material: AISI 316L (1.4435)
• Filling oil: silicone oil
• Supply voltage: 24 V DC ±3 V DC
• Load with HART: 250 Ω
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)
Sensor with 1/2" thread and
silicone oil
Calibration position, no
measurement error
< +4 mbar (+0.06 psi) < –4 mbar (–0.06 psi)
Sensor with thread > 1/2"
and flanges
< +10 mbar (+0.145 psi)
The value is doubled for inert oil.
< –10 mbar (–0.145 psi)
The value is doubled for inert oil.
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 .
Resolution
• Current output: 1 μA
• Display: can be set (factory setting: presentation of the maximum accuracy of the transmitter)
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
Application limits
A high ratio between the level and head pressure or between the differential pressure and static
pressure can result in large measured errors. A maximum ratio of 1:10 is recommended. For
calculation purposes, please use the free "Applicator" calculation tool, which is available online at
"www.endress.com/applicator" or on CD-ROM.
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