Cermet II I.S.

 Self-Contained Hygrometer Systems
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.

Product Features

  • FM, CSA and ATEX Certified
  • Pressure sensor input
  • Measurement accuracy up to ±1.8°F dew point
  • Use selectable measurement units
  • Up to 4 alarm relays
  • Wide measurement range, calibrated -150 to +70°F dew point
  • Analog and digital outputs
Cermet II I.S.

More Information

Technical Specification
SENSOR
Measurement Range -150 to +70°F dew point
Accuracy ±1°C from +20 to -60°C dew point
(±1.8°F from +68 to -76°F dew point)
±2°C from -60 to -100°C dew point
(±3.6°F from -76 to -238°F dew point)
Other Units of Measure 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 0.1°F dp, 0.01 ppmV, 0.1 mg/m³, 0.01 Lb/MMscf
Analogue Output 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 V DC: 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 confi gurable and adjustable over the full range, full choice of units and sensor fault alarm functions
Outputs:
Analog
Digital
0-10 V fully user configurable and scaleable
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°C (-4 to +140°F)
Storage Temperature -40 to +70°C (-40 to +158°F)
Operating Pressure From vacuum to 300 barg (4351 psig) (max)
Flow Rate 0-10 Nlmin-1 (0-21 CFM) at atmospheric pressure
Gas Velocity 20 ms-1 (65.6 FPS) (max) at atmospheric pressure

Applications
Natural Gas & Petrochemicals Power Generation

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