
74
11 Supplement
NCR-84 Two-wire 4 … 20 mA/HART
51141-EN-181127
Fulfilled HART specification
7.0
Further information on Manufacturer ID,
Device ID, Device Revision
See website of HART Communication Foundation
Deviation (according to DIN EN 60770-1)
Process reference conditions according to DIN EN 61298-1
Ʋ Temperature
+18 … +30 °C (+64 … +86 °F)
Ʋ Relative humidity
45 … 75 %
Ʋ Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Installation reference conditions
Ʋ Min. distance to internal installations > 200 mm (7.874 in)
Ʋ Reflector
Flat plate reflector
Ʋ False reflections
Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids
≤ 1 mm (meas. distance > 0.25 m/0.8202 ft)
Non-repeatability
5)
≤ 1 mm
Deviation with bulk solids
The values depend to a great extent on the application.
Binding specifications are thus not possible.
0,25 m (0.8202 ft)
10 mm (0.3937 in)
- 10 mm (- 0.3937 in)
1 mm (0.039 in)
- 1 mm (- 0.039 in)0
1 2
3
Fig. 58: Deviation under reference conditions (example: thread with integrated horn antenna, applies accordingly
to all versions)
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Variables influencing measurement accuracy
Specifications apply to the digital measured value
Temperature drift - Digital output
< 3 mm/10 K, max. 10 mm
Specifications apply also to the current output
Temperature drift - Current output
< 0.03 %/10 K relating to the 16 mA span or ≤ 0.3 %
Deviation in the current output due to
digital/analogue conversion
< 15 µA
Additional deviation through electromagnetic interference
Ʋ According to NAMUR NE 21
< 80 µA
5)
Already included in the meas. deviation
925-0373 Rev A