Item # Cermet II, Cermet II Dew-Point Transmitters on Michell Instruments, Inc. Michell Instruments, Inc. - Item # Cermet II, Cermet II Dew-Point Transmitters
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Cermet II Dew-Point Transmitters
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Cermet II is the intelligent choice for reliable on-line measurement of moisture in virtually any gas, across many applications. Cermet II combines Michell’s Advanced Ceramic Moisture Sensor and a monitor unit that can be located up to 1200 m apart (3930 ft). While Cermet II is so simple to use, it has the flexibility to be applied to almost any humidity measurement application. The instrument can display measurement units in ºC or ºF dew point, ppmV, lb/mmscf or g/m3 across the measurement range -100 to +20ºC dew point (-148 to +68ºF) at pressures up to 5000 psig. The Cermet II also can accept a pressure signal from a pressure transmitter (optional) providing the means of active pressure compensation for concentration units of measurement.

Cermet II Dew Point Transmitters

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Cermet II Dew Point Transmitters-2

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Sensor · Analyzer · Operating Conditions · Options

Sensor

Measurement Range

-100 to +20ºC dew point (-148 to +68ºF)

Accuracy (Dew Point)

±1 ºC from -60 to +20 ºC dew point (±1.8 ºF, -76 to +68 ºF)
±2 ºC from -100 to -60 ºC dew point (±3.6 ºF, -148 to -76 ºF)

Enclosure

Stainless steel

Ingress Protection

NEMA 4X

Operating Temperature1

-40 to +60 ºC
-40 to +140 ºF

Storage Temperature

-40 to +165 ºF

Maximum Operating Pressure

From vacuum to 5000 psig

Flow Rate

1 to 5 L/min
2.1 to 10.5 scfh

Gas Velocity

0 to 10 m/s
0 to 32.8 ft/s

Process Connection

5/8" UNF parallel thread

Sensor Calibration

Traceable to NIST
1 Compensated over -20 to +40ºC (-4 to +104ºF)


Analyzer

Measurement Units

ºC, ºF dew point; ppmV with user selectable range and resolution; lb/mmscf range dependent on pressure (natural gas); g/m3(natural gas). Digital processing and linearization with active or passive pressure compensation

Resolution

0.1 ºC from -80 to +20ºC dew point (0.18ºF, -112 to +68ºF)
1ºC from -100 to -80ºC dew point (1.8ºF, -148 to -112ºF)

Secondary Measurement Variable

Pressure using an optional external transducer over a range of 0 to 4000 psig. Completely user-configurable for any industry standard transducer with an 4-20 mA output. Automatic compensation for ppmV, lb/mmscf and g/m3 units.

Alarm Relays

Two user adjustable isolated 10A form 'C' rated at 240 VAC or 24 VDC

Analog Outputs

4-20 mA as standard (max load 500 Ω) user configurable and scalable

Digital Outputs

RS485

Power Supply

Universal 85 to 265 VAC, 50/60 Hz or 95 to 370 VDC

Operating Conditions

Monitor Operating Temperature

0 to +50 ºC
32 to +122 ºF

Sensor Operating Temperature

-20 to +50 ºC
-5 to +122 ºF

Monitor Ingress Protection

IP54 (NEMA 12) standard (front panel only)
IP66 (NEMA4) with optional cover (front panel only)

Sensor Ingress Protection

IP66 (NEMA 4)

Options

Analog Outputs

0-20 mA optional (max load 500 Ω)
0-10 V optional (min load 5 K Ω) both user configurable and scalable

Digital Outputs

RS485: provides 2-way communication - full data access to user and total instrument configuration

Alarm Relays

1 or 2 additional 5 A relays (max 4 total) n/o type fully user configurable and adjustable over the full range, full choice of units and sensor fault alarm functions

Power Supply

18 to 36 VAC; 9 to 60 VDC

Cable

Standard 6.5 foot (4000 foot max)

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