CDP301 Dew-Point Tester User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The CDP301 provides battery-powered manual visual measurement of the hydrocarbon
dew point and water dew point of processed natural gas. It is the result of more than
30 years’ experience in the supply of Dew-Point Testers to the worldwide oil, gas and
petrochemical industry.
The system consists of a hydrocarbon and water dew-point sensor cell and control
electronics housed in an Exd enclosure. A sample gas handling system to prepare the
gas sample prior to entry into the CDP301 Dew-Point Tester can also be supplied. The
Dew-Point Tester is designed to be positioned close to the process sample test point
and is ATEX, IECEx and cQPSus compliant for use in a Zone 1 or 2 Hazardous Area and
Class I, Div 1 Hazardous Locations. See marking label located on the side of Dew-Point
Tester to identify approvals.
The enhanced cooled-mirror principle of the CDP301 allows easy detection of
hydrocarbon or water dew point with the ability to review what has been observed
later. Key components of the dew-point tester are measurement cell, metallised-ceramic
mirror with integrated PT1000 resistance thermometer, triple-stage TEC (thermo-electric
cooler), hi-resolution colour camera, colour LCD display, tactile button HMI, operation
and measurement electronics, and rechargeable battery pack.
Standard accessories include a wheeled transport/storage case (suitable for non-
hazardous/safe area locations only) and backpack (of anti-static material) to carry the
CDP301 and sampling system to the location of use. A universal AC supplied battery
charger is provided (which must only be operated in safe area location). Spare battery,
sampling system and sample hoses are also available as optional accessories.
1.1 Sample Gas Path
The CDP301 measurement system must be supplied with gas at the required pressure
and ow via a sample gas handling panel. Sample gas entry and exit ports pass the
gas through ame arrestors. The inlet connection has a ow restriction device
tted. This is a mandatory safety device that limits pressure rise within the
Exd enclosure in the event of a gas leak occurring. The ow restriction device
must not be removed.
The Dew-Point Tester system components are housed within a cast, copper free aluminium
EExd rated enclosure. The enclosure has a screw cover incorporating a sealed window.
It is chromate primed, polyester coated in black, and provides environmental ingress
protection to IP64/NEMA4X. An enclosure breather is tted in the form of an additional
ame arrestor. It is important that no pipe connection is made to this breather and that
no restriction is allowed to occur.
All sample wetted metallic parts are manufactured in AISI 316L stainless steel with
Viton soft parts that comply with the NACE standard MR-0175 (latest edition). Tube
ttings are twin ferrule Swagelok© compression type.
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