PMC21 datasheet(22/48 Pages) EH

22 / 48 page

Cerabar PMC11, PMC21, PMP11, PMP21

Endress+Hauser

Performance characteristics of metal process isolating

diaphragm

Reference operating

conditions

• As per IEC 60770

• Ambient temperature TA = constant, in the range: +21 to +33 °C (+70 to +91 °F)

• Humidity φ = constant, in the range: 5 to 80 % rH

• Ambient pressure pA = constant, in the range: 860 to 1060 mbar (12.47 to 15.37 psi)

• Position of measuring cell = constant, in the 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 be 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

PMP21

±0.3

±0.1

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)

–40 to –20 °C (–40 to –4 °F)

+85 to +100 °C (+185 to +212 °F)

% of the calibrated span for TD 1:1

<1 bar (15 psi)

<1.2

≥1 bar (15 psi)

<0.8

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

PMC21 Datasheet(PDF) 22 Page - Endress+Hauser Group Services AG

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