Item # Cermet II I.S., Cermet II I.S. Self-Contained Hygrometers on Michell Instruments, Inc. Michell Instruments, Inc. - Item # Cermet II I.S., Cermet II I.S. Self-Contained Hygrometers
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All Categories > Dew-Point Transmitters > Cermet II I.S. Self-Contained Hygrometers > Item # Cermet II I.S.  
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Cermet II I.S. Self-Contained Hygrometers
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Cermet II I.S. is an easy to install, self-contained hygrometer system for measurement of the moisture content of flammable and non-flammable gases within hazardous areas. It consists of a safe area Cermet II I.S. Control Unit and an intrinsically safe transmitter, the Transmet I.S. Housed in a stainless steel case, the Transmet I.S. transmitter is rated NEMA 4X. The Cermet II I.S. Control Unit is a 19" rack-mount unit containing the display, transmitter power supply and isolation barriers suitable for location in a designated safe area. It provides all necessary user interfacing, including multiple units of measure display, alarms, analog and digital outputs. Control unit and transmitter are connected by up to 1500 feet of cable using galvanic isolation barriers.

Cermet II I.S. Self-Contained Hygrometers

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Cermet II I.S. Self-Contained Hygrometers-2

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Sensor · Control Unit Options · Transmet I.S. Transmitter · Interconnecting Sensor Cable Options

Sensor

Measurement Range

-148 to +68ºF dew point

Accuracy

±1ºC from +20 to -60ºC dew point (±1.8ºF from +68 to -76ºF dew point)
±2ºC from -60 to -100ºC dew point (±3.6ºF from -76 to -238ºF dew point)

Other Units of Measurement

Digital processing and linearization with pressure compensation from measured dew point with pressure compensation to any other selected unit - lb/mmscf and mg/m3 (for natural gas), ppmV with active or passive pressure compensation

Pressure Input

Fixed value (user programmed) or dynamic measurement with an optional 4-20 mA pressure transmitter

Resolution

0.1ºF dp, 0.01 ppmV, 0.1 mg/m3, 0.01 lb/mmscf

Analog Outputs

4-20 mA isolated (max load 500 Ω)

Sensor Calibration

Traceable to NIST

Power Requirement

85 to 264 VAC, 50/60 Hz or 90 to 370 VDC

Alarms

Two user adjustable isolated 10A @ 240 VAC or 24 VDC: 8 A (non-inductive load) for set points and fault detection

Mounting Panel

19" anodized aluminum, 5.197" high x 7" clearance depth

Additional Power Supply Unit

24 VDC clip-on rail type for Transmet IS

Barriers

2 galvanic isolation type

Control Unit Options

Power Supply

Low voltage version 18 to 36 VAC; 9 to 60 VDC

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

Analog Outputs

0-10 V fully user configurable and scaleable

Digital Outputs

RS485: provides 2-way communication - full data access to user and total availability of all set-up and configuration

Transmet I.S. Transmitter

Process Connection

5/8" UNF parallel thread

Enclosure

Stainless steel

Ingress Protection

NEMA 4X

Power

Provided by Cermet II I.S control unit

Operating Temperature

-20 to +60 ºC
-4 to +140 ºF

Storage Temperature

-40 to +70 ºC
-40 to +158 ºF

Maximum Operating Pressure

From vacuum to 300 barg
From vacuum to 4351 psig

Flow Rate

0-10 Nlmin-1 (0-21 CFM) at atmospheric pressure

Gas Velocity

20 m/s-1 (65.6 FPS) (max) at atmospheric pressure

Interconnecting Sensor Cable Options
Field cable specification: Polyethylene insulated instrumentation cable to BS5308 Part 1 - two collectively shielded dual conductors 0.5 mm2. Polyethylene insulation, galvanized steel wire armor, and PVC flame retardant outer sheath in blue. Low smoke and fume or halogen free outer sheath options available Max length: 1500 foot (greater dependent upon cable specification)

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