Promet I.S.
Process Moisture Analyser
Promet Process Moisture Analysers are heavy duty, industrial hygrometer systems for measurement of high pressure, process gases and vaporised liquids on natural gas platforms and terminals, petrochemical plants and industrial gas manufacturing facilities.
Promet combines the latest in ceramic moisture sensing technologies with sample conditioning system design engineering capabilities to provide a reliable and rugged on-line instrument. The flexible modular concept of Promet allows Michell Instruments to work with the customer to select a system tailored to the customer's specific application and technical requirements.
Product Features
- Total analyser system tailored to specific customer requirements
- Fully field interchangeable sensors
- Pressure compensation of conversions to moisture content
- Wide dew point measurement range with display in any hygrometric unit
- Analysis pressure up to 30MPa
- Sensor protected against glycol and other process borne liquid contaminants
- ATEX certified operation in Zone 1 or 2 EExd option
Technical Specification
| PROCESS MOISTURE ANALYSER | |
|---|---|
| Sensor Transmet IS* | |
| Measurement range | -100 to +20 °C dew point |
| Accuracy | ±1 °C from +20 to -60 °C dew point; ±2 °C from -60 to -100 °C dewpoint |
| Hygrometric units | Digital processing linearisation with pressure compensation from measured dew point with pressure compensation to any other preferred unit - dew point, Lb/mmscf and mg/Nm3 (for natural gas), ppmV |
| Pressure input | Fixed value (user programmed) or dynamic measurement (4-20 mA pressure transmitter, optional) |
| Resolution | 0.1 °C dp, 0.1 °F dp, 0.01 ppmV, 0.1 mg/m3, 0.01 Lb/mmscf |
| Analogue output | 4-20 mA isolated (max load 600W) |
| Sensor calibration | Traceable to British (NPL) and American (NIST) National Humidity Standards |
| Alarms | Two user adjustable for set points and operating configurations (4 optional) |
| Mounting panel | 19” anodised aluminium, ‘3U’ high 132 x 200 mm clearance depth |
| Accuracy | +/- 0.25% FS |
| Sample Conditioning Systems | |
| Enclosure | Glass fibre reinforced polyester (flame retarding, anti-static). All fixtures stainless steel. Option for complete enclosure in AISI 316 stainless steel. |
| Dimensions | 775H x 612W x 329D mm |
| Enclosure mounting | Stainless steel wall mounting brackets |
| Ingress protection | IP65 / IP66 optional (NEMA 4) |
| Cable/pipework | All through base of enclosure. Pre-machined M20 entries clearance holes for sensor field cable and heater power supply cable entries. 6 mm bulkhead compression couplings for process gas supply and exhaust |
| Flow rate | 5 Nlmin-1 (add 10 Nlmin-1 for configuration with ‘continuous drain’ arrangement) |
| Analysis pressure | Up to 30 Mpa |
| Enclosure Temp. | Heater/thermostat sdjustable set-point range 0 to control 50 °C. |
Optional vortex cooling option for desert conditions
Heater power supply 110/120 or 220/240/255 V ac, 50/60 Hz. Power consumption 100 or 200 Watts max. Add 40 Watts for single stage electricity heated pressure regulation where used (80 Watts for two stage)
Operating Shaded position, on or off shore, -40 to +40 °C environment (+60 °C max transient)
Interconnecting Sensor Cable
Field cable spec Polyethylene insulated instrumentation cable to BS5308 Part 1 - two collectively screened dual conductors 0.5 mm2. Polyethylene bedding, galvanised steel wire armour, and PVC flame retardant outer sheath in blue. Low smoke and fume or halogen free outer sheath options available.
Max length 250 m (greater dependent upon cable spec)
Terminating link Medium duty, grey PVC sheathed, braided cables cables provided for safe area termination to Promet Monitor and hazardous area termination inside the sample conditioning system enclosure.
Safety Aspects
The complete Promet package meets the requirements of BS5345: Part 1: 1989 and other European codes of practice for Zone 1 potentially hazardous area operation of the sensor and sample conditioning system to analyse gases of all gas groupings inclusive of IIC. The Promet Monitor must be located in a designated non-hazardous area (or in an optional EExd housing).
All relevant components in the potentially hazardous area are themselves individually certified to ATEX standards. Transmet IS is ATEX certified by EECS for use in hazardous areas to toII 1G EEx ia IIC T4 when used with a pair of isolation or shunt diode barriers for signal and power supply connections. Transmet IS has been FM listed (USA) CL1, Div1, Gp A, B, C & D, T4 and CSA (Canada) certified to Ex ia (Class 1, Groups A, B, C & D). The standard sampling system enclosue is constructed in anti-static, flame retardant GRP to EN50 014.6.3. The sample conditioning system heater and thermostat are certified EEx d IIC T5 and EEx ed IIC T6 respectively through PTB. Electrically heated pressure regulators (where required) are certified EEx d IIC T3 through ISSeP.
