Gxt Ferret 54 ENGINE DIAGNOSTIC CENTER Manuel d'utilisateur télécharger pdf (Page 90)

HC-HANGUP

Occasionally, residual hydrocarbons may

linger in the system, causing an HC reading

of over 20 ppm with the probe sampling

ambient air. This is sometimes referred to as

HC-Hangup. If this occurs, and multiple

Purges fail to clear the problem, the source

can be isolated by running the Purge function

with the Sample Hose Assembly

disconnected. If the Purge function passes,

the Sample Hose may need cleaning (see

Cleaning The Sample Hose). If the HC levels

are still high, the filters may be saturated.

The filter bowl contains two filters of different

grades, separated by a sealing Filter Gasket.

These filter the sample that is passed to the

measurement system. Refer to the label on

the Gas Detector for part numbers, and be

careful to install the filters in the proper

locations, separated by the Filter Gasket. If

the Filter Gasket is not in place, the

sample gas will bypass the filters and

enter the Gas Detector directly, causing

possible damage. Make sure the O-ring is

in place, and twist the bowl halves together

so that they lock.

The disposable in-line filter must be replaced

when it is dirty. This prevents contaminants

from entering the drain pump and causing

damage. Be sure that the tubing is clamped

at each end of the filter.

Always perform a Leak Test after changing

filters.

REPLACING THE FILTERS

If the filters appear dirty, or Low Flow

warnings occur frequently, the filters may

need changing. How often filter replacement

is needed will depend upon the amount and

the types of vehicles being tested. To avoid

drawing contamination into the Gas Detector,

make sure the pumps are not running while

changing filters.

8-5

Upper

Filter

Filter

Gasket

Lower

Filter

O-Ring

In-Line Filter

NOTE

THE UPPER AND LOWER FILTERS ARE

NOT INTERCHANGEABLE. THE LOWER FILTER

IS

MARKED WITH A RED DOT.

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