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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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Product Manual Datasheet
Natural Gas Water Dew-Point Analyzer
Features
EExd flameproof certified - IECEx, ATEX, UKCA, cQPSus and TR CU Ex
Complete hazardous area installation
Single- or dual-channel measurement
Moisture content, dew point and pressure
Calibration traceable to NPL (UK) and NIST (USA)
Range -120...+30°Cdp (-184...+86°F), 0.001...30,000 ppmV
Remote global access options
Sour gas compatible
Field calibration maintenance
Promet EExd Process Moisture Analyzers are hazardous-area rated industrial hygrometer systems for measurement of water vapor content in process gases on natural gas platforms and terminals as well as in petrochemical plants and industrial manufacturing facilities.
The Promet EExd is installed directly in the hazardous area, simplifying site installation and retrofits. Promet EExd combines proven Michell moisture sensing technologies with sample conditioning systems designed to provide a reliable and easy-to-operate, multi-channel, on-line instrument for moisture measurement in flammable gases.
Specifications
| Channel Configurations | Single and two channel |
| Moisture Parameters | Dew point °C and °F |
| Moisture Content |
Automatic pressure compensated conversions: ppmV for natural gas and ideal gas lb/mmscf and mg-m-3 for natural gas Dew point at a pressure input by the user for natural gas and ideal gas. Calculations for natural gas moisture content based on either IS0 18453 or IGT#8 to customer order preference. |
| Analysis Pressure | barg, MPa and psig |
| Sensor Technology | Michell Ceramic Metal-Oxide Moisture Sensor |
| Measurement Range |
-120oC dp...+30oC dp (-184...+86 °F) 1 ppbV...30,000 ppmV 0...250 barg (0...3625 psig) |
| Calibration Range |
-100 °C dp...+20 °C dp (-148 °F dp...+68 °F dp) 10 ppbV...23,000 ppmV |
| Accuracy |
Dew point: ±1 °C between –59.9 & +20 °C dp (±1.8 °F between -75.8 & 68 °F dp) Moisture content: ±10 % of reading Dew point: ±2 °C between –60 & -100 °C dp (±3.6 °F between -76 & -148 °F dp) Moisture content: ±20 % of reading Analysis Pressure: ±0.25 % FS. |
| Measured Resolution |
0.1 °C (0.18 °F): –80...+20 °C dp (-112...+68 °F) 1 °C (1.8 °F): –100...-80 °C dp (-148...-112 °F) |
| Displayed Resolution |
Dew point: 0.1 °C (0.18 °F) Moisture content: autoscale, 5 digits MPa and BarG: 0.1, psig: 1.0 |
| Resolution |
0.1 °C between +20 °C dp and -80 °C dp (0.18 °F between +68 and -112 °F dp) 1 °C between -80 °C dp and -100 °C dp (1.8 °F between -112 and -148 °F dp) |
| Temperature Coefficient | Algorithm compensation (-20...+50 °C) |
| HMI: Keyboard Interface | Capacitive touch-screen through glass |
| Display | Vacuum fluorescent |
| Datalogging |
A rolling maximum of 150 data logs is available. Each log records time, date, moisture and pressure values for each channel. 5 minutes minimum and 60 minutes maximum logging intervals can be set by the user |
| Communications and Output |
Two non-isolated 4...20 mA per measurement channel. 500 Ω maximum load. Range and parameter settable by
user. Modbus RTU @ 9600 baud-rate Alarms: two volt free contacts per channel; one process value and one instrument status. Also available via Modbus communications |
| Main Unit Enclosure | Internal temperature control for condensation protection and stable analysis conditions |
| Type | Explosionproof NEC/Flameproof EExd |
| Construction | Cast copper-free aluminium |
| Finish | Chromate primer, Polyester P9010 powder coated (black). Meets BS3900 |
| Operating Pressure | 30...138 barg (435...2000 psig)* |
| Sample Connections | 1/8” NPT (F) |
| Sample Flow Rate | 1 Nl/min (Nm3/hr) (2.1 scfh) |
| Sample Flow Alarm | Optional |
| Power Supply | 90...260 V AC, 50/60 Hz, 180 W Main Unit |
| Operating Environment |
Indoor/Outdoor -20 °C...+60 °C (-4...+140 °F) Max 95 % rh. Shaded location |
| Certification | |
| Hazardous Area Certification |
ATEX/UKCA: II 2 G Ex db IIB+H2 Gb T5 (Tamb -40 °C...+44 °C) – 60 barg max. T4 (Tamb -40 °C...+60 °C) – 60 barg max. T3 (Tamb -40 °C...+60 °C) – 138 barg max. IECEx: Ex db IIB+H2 Gb T5 (Tamb -40 °C...+44 °C) – 60 barg max. T4 (Tamb -40 °C...+60 °C) – 60 barg max. T3 (Tamb -40 °C...+60 °C) – 138 barg max. cQPSus: Class I, Division 1 Groups B, C & D T5 (Tamb -25 °C...+44 °C) – 60 barg max. T4 (Tamb -25 °C...+60 °C) – 60 barg max. T3 (Tamb -25 °C...+60 °C) – 138 barg max. CL I ZONE 1: Ex db IIB+H2 Gb AEx db IIB+H2 Gb T5 (Tamb -40 °C...+44 °C) – 60 barg max. T4 (Tamb -40 °C...+60 °C) _ 60 barg max. T3 (Tamb -40 °C...+60 °C) – 138 barg max. |
| Additional | TRCU 012 (EAC), PESO (India), KCS (Korea), Ukraine Ex |
| Pattern Approval | GOST-R, GOST-K |
| *Other variants available to customer specific order – consult Michell Instruments | |
Suitable Applications
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