Performance Characteristics Of Metal Process Isolating Diaphragm; Reference Operating Conditions; Measuring Uncertainty For Small Absolute Pressure Measuring Ranges; Influence Of The Installation Position - Endress+Hauser Cerabar PMC11 Technical Information

Reference operating
conditions
Measuring uncertainty for
small absolute pressure
measuring ranges
Influence of the installation
position

Resolution

Reference accuracy

Thermal change of the zero
output and the output span

Long-term stability

Switch-on time

22
Performance characteristics of metal process isolating
diaphragm
• As per IEC 60770
• Ambient temperature T
A
• Humidity φ = constant, in the range of 5 to 80 % rH
• Ambient pressure p = constant, in the range of:860 to 1 060 mbar (12.47 to 15.37 psi)
A
• 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)
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.
→  23
Current output: min. 1.6 μA
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
1)
PMP11 ±0.5
PMP21 ±0.3
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
Measuring cell –20 to +85 °C (–4 to +185 °F)
% of the calibrated span for TD 1:1
<1 bar (15 psi) <1
≥ 1 bar (15 psi) <0.8
Device 1 year
PMP11 ±0.2
PMP21
≤2 s
Cerabar PMC11, PMC21, PMP11, PMP21
= constant, in the range of:+21 to +33 °C (+70 to +91 °F)
Non-linearity
±0.1
±0.1
5 years
±0.4
Non-repeatability
±0.1
±0.1
–20 to –40 °C (–4 to –40 °F)
+85 to +100 °C (+185 to +212 °F)
<1.2
<1
8 years
% of URL
±0.45
Endress+Hauser