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INTRODUCTION
Channel 2 flow components comprise the following:
(Optional) Flow Switch 2 (FS2):
•
is present throughout the moisture measurement stream
Pressure Transducer 2 (PT2):
•
the sample gas pressure within the moisture measurement cell
1.3
Operating Overview
The system continuously measures dew point/moisture and pressure in an uninterrupted
gas stream flow. The flow switch, if fitted, will notify the system if the gas flow falls
below the recommended rate.
Moisture and pressure for each channel are logged at a user-defined interval. The logs
are available through the user interface or via the serial communications. Two 4–20 mA
outputs for each channel are available to remotely read the dew point/moisture and
pressure in real time.
1.4
User Display and Interface
The Promet EExd User Display and Interface Unit is presented via the circular window
of the enclosure. Operation is achieved by a unique system, which allows full control
through the glass of the enclosure cover. The cover is fully detachable for greater
access into the enclosure during the installation and initial set-up of the instrument.
During normal operation of the instrument the cover must remain fully secured.
1.5
Advanced Sensor Technology
The Promet EExd utilizes the Michell Ceramic Moisture Sensor, an advanced impedance
sensor technology with more than 1,000 installations in natural gas and petrochemical
applications today. Semiconductor thick- and thin-film technologies combine in metallized
ceramics and achieve a durable sensor with measurement capability from lower than 10
ppb
moisture content and high-pressure capability up to 138 barg (2000 psig).
V
Unlike older aluminum-oxide technologies, the inherent immunity to pressure shock of
the Ceramic Sensor avoids the risk of sensor failure at commissioning or shut-down.
The inert nature of the sensor gives long-term resistance to chemical attack, even in
extremely sour gas with percentage level H2S concentrations. The Ceramic Sensor
response characteristic is proportional to the partial pressure of water vapor in the gas
being measured, which is directly related to the dew-point temperature.
2
Promet EExd User's Manual
Provides indication that a flow
Provides the measurement of
97090 Issue 16.1, November 2019
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