Promet I.S. Process Moisture Analyzer

Promet I.S. Process Moisture Analyzers are heavy duty, industrial hygrometer systems for measurement of high pressure, process gases and vaporized liquids on natural gas platforms and terminals, petrochemical plants and industrial gas manufacturing facilities. Promet I.S. combines Michell’s proven ceramic moisture sensor with sample conditioning system design engineering capabilities to provide a reliable and easy to operate, multi-channel on-line instrument for both flammable and non-flammable gases.

Product Features

  • Simple, cost efficient operation and low-maintenance
  • Immune to chemical attack from H2S, mercaptans and other sulphides
  • Protected against glycol or other liquid contaminants
  • Accurate direct dew-point measurement at process pressure up to 45 MPa
  • Moisture range from ambient to ppb level with exhaustive list of hygrometric units, including key parameters of natural gas
  • Two 4-20 mA configurable outputs and digital Modbus RTU based communication
  • Assured calibration integrity traceable to NPL (UK) and NIST (USA)
  • User programmable or real-time active pressure compensation for moisture content calculation
  • Multichannel with up to 4 independent measurement channels
Promet I.S.

Promet I.S.

Technical Specification

Sensor Technology Michell Ceramic Moisture Sensor
Sensor Version Easidew PRO I.S.
Measurement Range -100 to +20°Cdp
Calibration Range -100 to +20°Cdp
Calibration Traceable to British (NPL) and American (NIST) National Humidity Standards
Accuracy Dew point: ±1°C between -60 and +20°Cdp
Moisture content: ±10% of reading
Dew point: ±2°C between -60.1 and -100°Cdp
Resolution 0.1°C between +20 and -100°Cdp
Analysis Pressure Up to 45 MPa (450 barg)
Operating Temperature -40 to +60°C
Sample Flow Rate 1 to 5 l/min
Optional Pressure Sensor 0-138 barg (other ranges available)
Accuracy: ±0.25% FS
Hazardous Area Certification ATEX - II 1 G Ex ia IIC T4 Ga (-20°C = Ta = +70°C)
FM - IS / I / 1 / ABCD / T4 Ta = +70°C
CSA - IS Class I, Division 1, Groups ABCD T4 +70°C
IECEx - Ex ia IIC T4 (-20°C = Ta = +70°C)
Pattern Approval GOST-R, GOST-K
Control Unit
Display Two line 6-digits LED, displaying moisture content / dew point (user toggle) and analysis pressure
Analogue Output Two 4-20 mA (max load 500 Ω)
User-configured for parameter, unit and range
Digital Output RS485 Modbus RTU
Display Mode Moisture content (ppmV)
Moisture content in natural gas (ppmV, lb/MMSCF, mg/m3)
Dew point (°C or °F)
Temperature (°C or °F)
Pressure (psig, barg)
Pressure Compensation Fixed value (user-programmed) or dynamic input from optional pressure sensor
Display Resolution 0.1°Cdp, 0.1°Fdp, 0.1 - 0.001 ppmV ideal gas (adjustable), 0.01 ppmV natural gas, 0.01 mg/m3,
0.01 lb/MMSCF, 1 psig, 0.1 barg
Alarms Four alarm relays. Control action and set-point are user-programmable
Two Form C contacts rated 10 A, 240 V AC or 8 A, 24 V DC. Non-inductive load
Two Form A contacts rated 5 A, 240 V AC or 4 A, 24 V DC. Non-inductive load
I.S. Barriers Galvanic isolation type, integrated to Control Unit
Power Supply 90 to 264 V AC, 50/60Hz or 10 to 72 V DC, 10 W max power consumption
Interconnection Cable General instrument type, twisted pair, screened, single pair (two pairs with pressure sensor)
Enclosure 19" sub rack unit
Dimensions 132 x 483 x 375mm (h x w x d)
(100mm minimum clearance depth for cables and vents)
Operating Environment Indoor, safe area, 0 to +50°C, < 90% RH
Premium Sampling Systems
Enclosure 304 stainless steel (EN1.4301) enclosure
Option for complete enclosure in 316 stainless steel (EN1.4401)
All fixtures stainless steel
Galvanised steel internal mounting plate
Open panel version available for indoor installation
Dimensions 800 x 600 x 300mm (h x w x d)
Enclosure Mounting Stainless steel wall mounting brackets
Enclosure Ingress Protection IP66
Enclosure Temperature Control Heater/thermostat options for fixed set-point +20°C or
adjustable set-point range 0 to control 50°C
Heater Power Supply 110/120 or 220/240/255 V AC, 47/63 Hz
Power consumption 100 W max
Operating Environment Shaded position, on or off shore, -20 to +50°C (-40 to +60°C max transient)
Enclosure cooling option recommended for climatic ambient > +45°C

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