PMC21 datasheet(20/48 Pages) EH

20 / 48 page

Cerabar PMC11, PMC21, PMP11, PMP21

Endress+Hauser

Performance characteristics of ceramic process isolating

diaphragm

Reference operating

conditions

• As per IEC 60770

• Ambient temperature TA = 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 pA = constant, in the range of:860 to 1060 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

• Material of process isolating diaphragm: Al2O3 (aluminum-oxide ceramic, Ceraphire®)

• 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 range 1 to 30 mbar (0.0145 to 0.435 psi): 0.4 % of reading

• in 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 1)

Non-repeatability

PMC11 2)

±0.5

±0.1

PMC21

±0.3

±0.1

The non-linearity for the 40 bar (600 psi) sensor can be up to ± 0.15% of the calibrated span up to the

maximum turn down.

For devices with 0 to 10 V output, a non-linearity of up to max. 0.3 V can occur for signal values below

0.03 V.

Overview of the turn down ranges →  14

Measuring ranges

Turn down

Device

% of URL

100 mbar (1.5 psi)to

40 bar (600 psi)

1:1 to TD 5:1

PMC11

±0.5

PMC21

±0.3 1)

For the 100 mbar (1.5 psi) and 250 mbar (4 psi) measuring ranges, the following applies: In the event of

heat effects on the initial reference conditions, an additional deviation of max. 0.3 mbar (4.5 psi) from the

zero point or the output span is possible.

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 URL for TD 1:1

<1 bar (15 psi)

<1.2

≥ 1 bar (15 psi)

<0.8

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