Rev 02, 09/21
Perma Pure LLC
• A Halma Company • [email protected] • www.permapure.com
Telephone: 7
32-244-
0010 • Toll Free: 800
-337-
3762 • Fax:
7
32-244-8140
1
001 New Hampshire Ave.,
L
akewood, NJ 08701 USA
sample gas temperature above the sample gas dew point temperature and minimizes the possibility of liquid
water in the sample gas from reaching the PD sample gas dryer which could compromise performance.
7.1.2
Sample Gas Cooling Coil
A coil of tubing is located around the perimeter of the enclosure backplate to help cool the sample gas if it
enters the system hot. It improves the moisture removal capability of the coalescing filter and helps prevent
liquid water from getting to the PD sample gas dryer.
7.1.3
Sample Gas Filters/Eductor
The sample filter is FF-250 series with a 0.1 um, 95% efficiency standard coalescing element which removes
small particles and prevents liquid water and condensable vapors from passing through the system to the
analyzer.
Consisting of parts machined from solid PVDF fluoro-polymer, the filter body is designed to hold standard filter
elements as mentioned above for the purpose of removing particulate matter, water and aerosols of high
boiling point liquids like sulfuric acid.
The particulate matter is removed by collection on the filter element. Any aerosol liquids are removed by first
coalescing on the filter element and then collecting at the bottom of the filter bowl where the condensate can
be removed by the drain system.
7.1.4
Sample Gas Bypass Port
Response time is the time it takes for the sample gas to travel from the sampling point to the analyzer. In
emission monitoring applications, a long response time is usually not problematic. However, in process control
applications, fast response can be very important.
To reduce the response time without overwhelming the Hybrid Sample Gas Cooler
system’s drying capacity, the
bypass port can be used to increase the sample gas flow from the sample point to the Hybrid Sample Gas
Cooler system. While the bypass flow is not dried in the Hybrid Sample Gas Cooler system, it is cooled, filtered,
and liquid water is removed. This helps reduce corrosion and contamination of any bypass flow regulation
equipment that is connected to the bypass port.
It should be noted that the increased sample flow created by use of the bypass port may increase the need for
filter element maintenance.
There are several ways to control the bypass flow using a needle valve/flowmeter, back-pressure regulators,
etc. This will be left to the customer to determine the best method for their application. The internal plumbing
of the bypass port is shown below.
