Deltabar S
20 Endress+Hauser
Performance characteristics – metallic process isolating
diaphragms
Reference accuracy –
PMD75, FMD77, FMD78
The reference accuracy comprises the non-linearity according to limit point setting, hysteresis and
non-reproducibility as per IEC 60770. The data refer to the calibrated span.
The following applies for the root-extracting characteristic curve:
The accuracy data of the Deltabar S is taken into the accuracy calculation of the flow rate with a factor of 0.5.
PMD75
FMD77, FMD78
Total performance – PMD75 The "Total performance" specification comprises the non-linearity including hysteresis, non-reproducibility, the
thermal change of the zero point as well as the influence of the line pressure (p
st
= 70 bar).
Total Error The total error comprises the long-term stability and the total performance:
Measuring cell % of the set span
10 mbar, 30 mbar
• TD 1:1
• TD > 1:1
=
=
±0.15
±0.15 x TD
100 mbar
• TD 1:1 to TD 4:1
•TD > 4:1
=
=
±0.075
(0.012 x TD + 0.027)
500 mbar
• TD 1:1 to TD 15:1
•TD > 15:1
=
=
±0.075
(0.0015 x TD + 0.053)
Platinum version:
00 mbar
•TD 1:1 = ±0.05
Measuring
cell
FMD77 FMD78
% of the set span (influence of the diaphragm seal included)
100 mbar
• TD 1:1 to TD 4:1
• TD > 4:1
=
=
±0.15
(0.03 x TD + 0.03)
• TD 1:1 to TD 4:1
• TD > 4:1
=
=
±0.15
(0.03 x TD + 0.03)
500 mbar,
3 bar, 16 bar
• TD 1:1 to TD 15:1
•TD > 15:1
=
=
±0.075
(0.0015 x TD + 0.053)
• TD 1:1 to TD 4:1
•TD > 4:1
=
=
±0.15
(0.02 x TD + 0.07)
40 bar
• TD 1:1 to TD 4:1
•TD > 4:1
=
=
±0.15
(0.02 x TD + 0.07)
Measuring cell AISI 316L/1.4435, Alloy, Gold-Rhodium
or Monel process isolating diaphragm
Tantal process isolating diaphragm
% of the set span
500 mbar to TD 2:1 0.15 0.30
All specifications apply to the temperature range –10...+60°C (+14...+140°F).
Measuring cell AISI 316L/1.4435, Alloy, Gold-Rhodium
or Monel process isolating diaphragm
Tantal process isolating diaphragm
% of URL/year
10 mbar, 30 mbar,
100 mbar
0.33 0.48
500 mbar 0.20 0.35
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