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KMDM220 GAS CONDITIONING MODULE
This module is fitted in the front compartment of a standard K9206 carry case and comprises a Peltier fan
cooled chiller assembly, a peristaltic pump to automatically remove condensate, the control electronics
and a power supply module. The module is supported on an aluminum alloy chassis.
The chiller is connected to a flue mounted electrically heated probe (KMHP1200) by a 9.8 foot long heated
line with automatic temperature control (KMHL3000). Because the gas that is extracted from the flue is
maintained at 248°F no condensation occurs in the probe or the hose and so no sample gas is lost in the
condensate. The chiller flash cools the sample gas to below the ambient dew point and any water in the
gas immediately condenses. The condensate is then pumped away using a peristaltic pump. Because the
gas has no chance to remain in contact with the condensate, volatile sample gas is not lost into the con-
densate. The chilled gas then naturally warms up as it passes through the sampling pump to the sensors
and as it does so its humidity reduces and there is no risk of further condensation.
SETTING UP KMDM220
The heated sample probe must be connected to the top of the heated line and a gas tight connection
be made without over tightening the connections. This joint must then be thermally insulated. Both the
heated probe and the heated line must be connected to a mains power source via a suitable Residual
Current Device (RCD) and be left powered up for 20 minutes to achieve their operating temperature before
attempting to extract sample gas.
When the probe is inserted into the sampling point is must be suitably supported to prevent bending and
unnecessary strain. Likewise the heated line should be carefully supported and never be twisted or kinked
as this may damage the internal heating elements.
The heated line is connected to the chiller by attaching the end of the line to the through bulkhead con-
nection in the K9206 carry case. A short flexible connection then links the hose to the chiller. The chiller
needs to be powered up for at least 10 minutes before it is used.
The peristaltic pump operates automatically. Always check that the drain of the peristaltic pump is clear
and that there are no blockages. The peristaltic pump needs to have its flexible rotor replaced after every
1000 hours of operation.
To operate efficiently the chiller needs to be well ventilated so the case lid must be removed, however
the unit must be protected externally to prevent ingress of water from either the plant being tested or
from rainfall.
Summary of Contents for K9206
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