Promet EExd
Process Moisture Analyser
For the last thirty years, Michell Instruments has provided on-line moisture measurement solutions for the natural gas and petrochemical industries. All of that experience and expertise is encapsulated in Promet EExd, where the highest priorities have been given to the needs of the customer in terms of simplicity of installation, total plant communications integration, moderate cost of ownership, and highest calibration integrity.
Promet EExd is certified as flameproof for use in IEC Zone 1 and 2/NEC Class 1 Div1. Promet EExd offers single and dual channel moisture measurement, with integrated electronic pressure reading, within a single field-installed flameproof housing. User interface is provided through the bright vacuum fluorescent display and touch screen controls.
Comprehensive Sampling Systems of state-of-the-art design, with best practice sample filtration, pressure reduction and flow control, and a range of options are available to fulfil user specific installation and application requirements.
Product Features
- EExd Flameproof ATEX and CSA certified
- Complete zone 1 or 2 installation
- Low wattage AC supply only utility requirement
- Single- or dual-channel measurement
- Calibration traceable to NPL (UK) and NIST (USA)
- Field adjustment maintenance by user adjustment or unique sensor exchange service
- Range –120 to +30 °C Dew Point, 0.001 to 30,000 ppmV
- Moisture content units in ppmV, mg.Nm-3 , LB/MMSCF
- Integrated electronic pressure measurement
- Modbus RTU and 4-20mA linear signals
- Process and instrument status volt-free alarm contacts
- Remote global access options
- Touch screen control
Technical Specification
| Promet EExd and Main Unit | |
|---|---|
| Measured and Calculated Values |
Dew point ºC & ºF |
| Conversions | ppm(v) for Natural Gas and Ideal Gas LBMMSCF and mgNm-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 ISO 18453 or IGT#8 to customer order preference. |
| Keypad/Display | Capacitive touch-screen through glass. Display: Vacuum Flourescent. |
| Data logging | 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. |
| Communication & Outputs | Four non-isolated 4-20mA channels. 500 ohms maximum load. Range and value settable by the 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 | Flameproof EExd. |
| Construction | Body and lid cast Copper free Aluminum LM25(EN AC-42000). 15mm thick heat resistant glass window. Cable gland entries 1/2” NPT (female) |
| Finish | Chromate primer, Polyester P9010 powder coated (Black). Meets BS3900 |
| Electrical Connections | 2.5mm2 two part terminals. |
| Hazardous Area Certification | ATEX Certification Code: Group II, Category 2 G |
| Code | EEx d IIB + H2 T4 Tamb –40 +60 °C (-40 +140 °F) |
| Ingress Protection | IP66 (NEMA 4) |
| Measurement Range | -120 ºC dp to +30 ºC dp. (-184 / +86 °F) 1 ppbV to 30,000 ppmV |
| Calibration Range | -100 ºC dp to +20 ºC dp. (-148 / +68 °F) 10 ppbV to 23,000 ppmV |
| Accuracy | Dew point: ±1 °C between –59.9 & +20 °Cdp (±1.8 °F: -75.9 to +68 °Fdp) Moisture content: ±10% of reading Dew point: ±2 °C between –60 & -100 °Cdp (±3.6 °F: -76 to -148 °Fdp) Moisture content: ±20% of reading Analysis Pressure: ±0.25%FS. |
| Measured Resolution | 0.1 °C: –80 to +20 °C dp (0.2 °F: -112 to +68 °Fdp) 1 °C: –100 to -80 °C dp (2 °F: -148 to -112 °Fdp) |
| Displayed Resolution | Dew point: 0.1 °C (0.2 °F) LB/MMSCF: >999.9 = 0.1, <999.9 = 0.02 ppm(v) & mg.Nm-3: < 100 = 0.001, >100 < 1000 = 0.01 >1000 = 0.1 MPa & Barg: 0.1 Psig: 1.0 |
| Temperature Coefficient | Algorithm compensation |
| Operating Pressure | Max. 206 Barg , (2987 psig) |
| Sample Gas connections | ¼” NPT (female) |
| Sample Flow Rate | 0.0 – 0.4 m3/h (0-6.66 litres per min.) |
| Power Supply | 90 – 264Vac 47 to 63Hz, 110 to 300 Vdc, 180W |
| Operating Environment | Indoor/Outdoor -20 °C to +60 °C (-4 +140 °F) Max 95 % rh. Shaded location |
| In/Out port connections | ¼” NPT (female) |
| Remote Interface | Optional, for Indoor Safe Area Installation |
| Host Capacity | Up to 31 Michell EExd Process Instrumentation Range analyzers in any combination of models via Modbus |
| Display | Backlit color 15cm/6” LCD |
| User Interface | Integral mouse, on-screen keyboard |
| Functions | View and modify analyser operating settings Record parameters to file and view virtual chart recorder Analyser diagnostics |
| Ports | LAN, USB2 |
| Data Download | CSV (comma separated variable) format for easy import to ExcelTM |
| Remote Access | OPC (OLE for Process Control) over a LAN Imbedded web page/unique IP address for PC access |
| Power Supply | 100-280V, 50/60Hz |
