Michell Instruments Promet EExd Specifications

Process Analyzers

Promet EExd

Process Moisture Analyzer

The complete moisture measurement package for critical process gas applications.

Highlights

• EExd ﬂ ameproof certiﬁ ed - IECEx, ATEX, CCSAUS and TC TR Ex

• Complete hazardous area installation

• Single or dual-channel measurements

• Moisture content, dew point and pressure

• Calibration traceable to NPL (UK) and NIST (US)

• Range -120 to +30°C dew point, 0.001 to 30,000 ppm

• Remote global access options

• Sour gas compatible

• Field calibration maintenance

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Applications

• Natural gas glycol dehydration

• Offshore export pipeline natural gas

• Transmission pipeline monitoring

• LNG production

• Catalytic reformer recycle hydrogen

• Ethylene feed stock to polymer plant

• Speciality gas production

Process Analyzers

Promet EExd – The Moisture Analyzer for the Modern Process Environment

Promet EExd offers single and dual channel moisture measurement, with integrated electronic pressure reading, within a single ﬁ eld-installed ﬂ ameproof housing. User interface is provided through the bright vacuum ﬂ uorescent display and touch screen switches.

Comprehensive Sampling Systems of state-of-the-art design, with best practice sample ﬁ ltration, pressure reduction and ﬂ ow control, and a range of options are available to fulﬁ l user speciﬁ c installation and application requirements.

Simple Flameproof Installation

Promet EExd is ﬂ ameproof certiﬁ ed for use in IEC Zone 1 and 2/NEC Class 1 Div. 1 and 2 hazardous areas. The Main Unit (electronics and sensing) and associated sampling system may be mounted at a convenient location next to the pipeline or process, with gas sample and vent connections. A single, low power single-phase AC supply is required for both the analyzer and sampling system. No barrier units or safety earth are required, saving the user both cost and inconvenience.

Advanced Sensor Technology

Promet EExd utilises the Michell Ceramic Moisture Sensor, offering unrivalled reliability and performance with more than 1,000 installations in natural gas and petrochemical installations world-wide.

Comprehensive Measurement Units

Promet EExd offers complete ﬂ exibility for the user to select the preferred hygrometric unit, be it dew-point temperature in °C or °F, or an exhaustive list of moisture content units. Integral pressure measurement enables unit conversions from dew point to moisture content, or dew point to dew point for different pressure conditions.

The ﬁ rmware of Promet EExd incorporates conversion data for ideal gases and also speciﬁ c to natural gas, using either the long established IGT Research Bulletin No. 8 or the more recently published ISO 18453, to customer order preference.

Calibration Maintenance Made Easy

Maintenance of traceable calibration is essential to the lifetime performance of all analyzers. Beware claims of “automatic calibration”. This is a non-traceable, internal ﬁ eld check and does not represent a true calibration of the analyzer.

For Promet EExd, true calibration maintenance is simple. The unique Michell Calibration Exchange Service offers fast delivery, world-wide, of newly calibrated replacement Ceramic Sensors certiﬁ ed traceable to NPL and NIST. As the calibration data for the Promet EExd Sensor is programmed into on-board nonvolatile memory, ﬁ tment of a Calibration Exchange Sensor renews the calibration with minimal downtime.

Thick- and thin-ﬁ lm semiconductor technologies with metallized ceramics produce an exceedingly durable sensor, with measurement sensitivity to 10 ppb high-pressure capability up to 138 barg (2000 psig).

Unlike older aluminium-oxide technologies, the inherent immunity to pressure shock of the Ceramic Sensor completely avoids any risk of sensor failure at commissioning or shut-down, whilst the unique inert nature of the sensor gives unrivalled long-term resistance to chemical attack, even in extremely sour gas with percentage level H

The Ceramic Sensor responds to the partial pressure of water vapour in the gas being measured, which is directly related to the dew point temperature. Every Promet EExd sensor is calibrated against fundamental dew point measurement systems in Michell’s world-class laboratory, which is internationally accredited and directly traceable to both NPL (UK) and NIST (USA) base standards. Precise process moisture measurement with a class leading best accuracy of ±10% of measured value is assured.

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No programming or data input is required by the user to complete the calibration process. The Calibration Exchange Service facilitates a professional, scheduled user QA programme at a lower cost than a traditional ‘return to manufacturer’ recalibration service.

Calibration or exchange is recommended annually for sweet gases and six-monthly for sour gases. Field calibration, using a portable dew point generator (ASTM D5454), against a calibrated reference hygrometer or against certiﬁ ed moisture- in-gas cylinders is also possible. Promet EExd accommodates such needs within the operating ﬁ rmware, providing user- friendly access to the calibration characterisation table to allow adjustments to be made at just one point (for example using a certiﬁ ed moisture in gas cylinder) or multiple points (using a ﬁ eld generator) across the measurement range.

Temperature Controlled for Best Accuracy

To ensure continuous optimum performance, the Promet EExd Main Unit is internally temperature controlled at the normal maximum local environmental temperature. This greatly reduces the effect of diurnal temperature variations that would otherwise introduce transitional adsorption and desorption effects in the sampling system components and result in erroneous measurements during periods of temperature change.

In addition the Promet EExd features an advanced temperature compensation algorithm that automatically maintains best possible measurement accuracy in the event of heater failure or if the prevailing climate exceeds the set temperature level.

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