Cerabar PMC11, PMC21, PMP11, PMP21
22 Endress+Hauser
Performance characteristics of metal process isolating
diaphragm
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 φ = 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 → 23)
• Zero based span
• Process isolating diaphragm material: AISI 316L (1.4435)
• Filling oil: synthetic oil polyalphaolefin FDA 21 CFR 178.3620, NSF H1
• Supply voltage: 24 V DC ±3 V DC
• Load: 320 Ω (at 4 to 20 mA output)
Measuring uncertainty for
small absolute pressure
measuring ranges
The smallest extended uncertainty of measurement that can delivered by our standards is:
• in the range 1 to 30 mbar (0.0145 to 0.435 psi): 0.4 % of reading
• in the range < 1 mbar (0.0145 psi): 1 % of reading.
Influence of the installation
position
→ 23
Resolution
Current output: min. 1.6 μA
Reference accuracy
The reference accuracy contains the non-linearity [DIN EN 61298-2 3.11] including the pressure
hysteresis [DIN EN 61298-23.13] and non-repeatability [DIN EN 61298-2 3.11] in accordance with
the limit point method as per [DIN EN 60770].
Device % of the calibrated span to the maximum turn down
Reference accuracy Non-linearity Non-repeatability
PMP11
1)
±0.5 ±0.1 ±0.1
PMP21 ±0.3 ±0.1 ±0.1
1) For devices with 0 to 10 V output, a non-linearity of up to max. 0.3 V can occur for signal values below
0.015 V.
Overview of the turn down ranges → 15
Thermal change of the zero
output and the output span
Measuring cell –20 to +85 °C (–4 to +185 °F) –20 to –40 °C (–4 to –40 °F)
+85 to +100 °C (+185 to +212 °F)
% of the calibrated span for TD 1:1
<1 bar (15 psi) <1 <1.2
≥ 1 bar (15 psi) <0.8 <1
Long-term stability
Device 1 year 5 years 8 years
% of URL
PMP11
PMP21
±0.2 ±0.4 ±0.45
Switch-on time
≤2 s
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