Performance Characteristics; Response Time; Reference Operating Conditions; Total Performance - Endress+Hauser Cerabar PMP71B Technical Information

Cerabar PMP71B

Response time

Reference operating
conditions

Total performance

Endress+Hauser

Performance characteristics

• HART: acyclic: min. 330 ms, typically 590 ms (depends on commands and number of preambles)
• HART: cyclic (burst): min. 160 ms, typically 350 ms (depends on commands and number of
preambles)
• As per IEC 62828-2
• Ambient temperature T
A
• Humidity j = constant, in the range of: 5 to 80 % rF ± 5 %
• Ambient pressure p = constant, in the range of: 860 to 1 060 mbar (12.47 to 15.37 psi)
A
• Position of the measuring cell: horizontal ±1°
• Input of LOW SENSOR TRIM and HIGH SENSOR TRIM for lower range value and upper range value
• Membrane material: AISI 316L (1.4435), Alloy C (Alloy C only for standard device (without
diaphragm seal)
• Fill fluid:
• Silicone oil (standard)
• Silicone oil, FDA (diaphragm seal)
• Supply voltage: 24 V DC ±3 V DC
• Load with HART: 250 Ω
• Turn down (TD) = URL/|URV - LRV|
• Zero based span
The performance characteristics refer to the accuracy of the device. The factors that influence the
accuracy can be divided into two groups
• Total performance of device
• Installation factors
All of the performance characteristics meet the requirement of ≥ ± 3 sigma.
The total performance of the device comprises the reference accuracy and the ambient temperature
effect and is calculated using the following formula:
Total performance = ± √ ( (E1)
E1 = Reference accuracy
E2 = Ambient temperature effect
Influence of diaphragm seal (calculation performed with Applicator "Sizing Diaphragm Seal")
Calculation of E2:
Ambient temperature effect per ±28 °C (50 °F)
(Corresponds to a range of –3 to +53 °C (+27 to +127 °F))
E2 = E2 + E2
M E
E2 = Main temperature error
M
E2 = Electronics error
E
• The values apply to process membranes made of 316L (1.4435)
• The values refer to the calibrated span.
= constant, in the range of +22 to +28 °C (+72 to +82 °F)
+ (E2) )
² ²
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