Endress+Hauser Cerabar M PMC51 - Performance Characteristics for Measuring Devices with Metal Process Isolating Diaphragm; Response Time; Reference Operating Conditions; Maximum Measured Error (Total Performance)

Cerabar M PMC51, PMP51, PMP55
32 Endress+Hauser
Performance characteristics for measuring devices with
metal process isolating diaphragm
Response time HART
• Acyclic: min. 330 ms, typically 590 ms (depending on command # and number of preambles)
• Cyclic (burst): min. 160 ms, typically 350 ms (depending on command # and number of
preambles)
PROFIBUS PA
• Acyclic: approx. 23 ms to 35 ms (depending on Min. Slave Interval)
• Cyclic: approx. 8 ms to 13 ms (depending on Min. Slave Interval)
FOUNDATION Fieldbus
• Acyclic: typically 70 ms (for standard bus parameter settings)
• Cyclic: max. 20 ms (for standard bus parameter settings)
Reference operating
conditions
• As per IEC 62828-2 / IEC 60770
• Ambient temperature T
A
= constant, in the range of +21 to +33 °C (+70 to +91 °F)
•
Humidity j = constant, in the range: 5 to 80 % RH
• Ambient pressure p
A
= constant, in the range: 860 to 1 060 mbar (12.47 to 15.37 psi)
• Position of the measuring cell: constant, in range: ±1° horizontally
• Input of LOW SENSOR TRIM and HIGH SENSOR TRIM for lower range value and upper range value
• Zero based span
• Material of the process isolating diaphragm: AISI 316L
• Filling oil PMP51: synthetic oil as per FDA 21 CFR 178.3620 (b)(1) and NSF H-1
• Supply voltage: 24 V DC ±3 V DC
• Load with HART: 250 Ω
Maximum measured error
(total performance)
The performance characteristics refer to the accuracy of the measuring device. The factors
influencing accuracy can be divided into two groups
• Total performance of measuring device
• Installation factors
All performance characteristics are in conformance with ≥ ± 3 sigma.
The total performance of the measuring device comprises the reference accuracy and the ambient
temperature effect and is calculated using the following formula:
Total performance = ± √ ( (E1)
²
+ (E2)
²
)
E1 = Reference accuracy
E2 = Temperature effect per ±28 °C (50 °F)
(corresponds to the range from –3 to +53 °C (+27 to +127 °F))
Calculation of E2:
E2 = E2
M
+ E2
E
E2
M
= Main temperature error
E2
E
= Electronics error
• The values apply for process isolating diaphragm made of 316L (1.4435)
• The values refer to the calibrated span