T&L Scanning Probes - DOP Solutions
T&L Scanning Probes - DOP Solutions
T&L Scanning Probes - DOP Solutions
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T probes and L probes for scan testing<br />
Safe-Change Housings and difficult-to-access HEPA filters<br />
Safe-change (bag-in-bag-out) housings have traditionally been tested volumetrically for<br />
leakage. In some cases this may be an acceptable measurement. The volumetric test<br />
though is 300-3000 times less sensitive than the ISO14644-3 scan test. There may be<br />
substantial defects in a HEPA filter installation that will pass the <strong>DOP</strong> volumetric test.<br />
This could significantly compromise human safety or the environment.<br />
To allow a scan test for filters which cannot be accessed or conventionally scanned<br />
<strong>DOP</strong> <strong>Solutions</strong> have produced new scanning options, T or L probes.<br />
A T scanning probe is a permanent installation forming part of the filter housing, and is<br />
installed at point of manufacture usually, but can be retrofitted. It is positioned into the<br />
downstream (clean side) of the filter housing, sealed through a glanded port and guided<br />
on rails across the filter. The probe shaft extends out of the filter housing and is sealed<br />
when not in use. The sample probe is sealed to the housing and the aerosol photometer<br />
downstream sample tube is attached to the probe shaft.<br />
<strong>Scanning</strong> of the filter is accomplished by drawing the probe across the filter or scanning<br />
zone at 1.5 cm per second. High differential pressures may require an additional return<br />
sample port in the safe-change housing, which also ensures the sample air is discharged<br />
safely back into the system that it was taken from.<br />
The T Probe comprises a 316 stainless steel with graduated sample holes, stainless<br />
steel probe sealing cap, stainless steel upstream sample return port and fittings for<br />
connecting it within the filter unit.<br />
Detailed installation instructions are provided with the sample probe kit and it is a<br />
requirement of the purchaser to install the component parts into the housing correctly.<br />
Each sample probe is manufactured to fit into the housing according to the dimensions<br />
supplied. The sample probe cap and sample return port are normally welded to the<br />
housing at the appropriate place but the system may be retrofitted simply by drilling port<br />
holes in the appropriate position and sealing the securing nuts with silicone compound.<br />
Retrofit kits are available.<br />
These are not intended, nor should they be used, to replace the conventional filter<br />
scanning probe with a photometer in the interests of time saving. This test is more<br />
reliable than the volumetric method, but the scanning speed must be slower than that for<br />
conventional testing, and the result will only indicate the presence of a leak but not the<br />
exact location of where it is.<br />
T & L probes v6<br />
PRODUCT<br />
T probe<br />
L probe<br />
MODEL<br />
NUMBERS<br />
<strong>DOP</strong>610-RF<br />
<strong>DOP</strong>610-W<br />
<strong>DOP</strong>305-RF<br />
<strong>DOP</strong>305-W<br />
<strong>DOP</strong>-315-L<br />
<strong>DOP</strong>-L<br />
<strong>DOP</strong> SOLUTIONS LTD<br />
Unit 10<br />
Protea Way<br />
Pixmore Avenue<br />
Letchworth<br />
Hertfordshire<br />
SG6 1JT<br />
United Kingdom<br />
Telephone:<br />
+44 (0)1462 676446<br />
Facsimile<br />
+44 (0)1462 486078<br />
Email:<br />
sales@dopsolutions.com<br />
Web:<br />
www.dopsolutions.com
L probe Sample port ABS 3/4in capped 105 x<br />
44mm, 50 mm high. Part No. : 630-SP-34IN-12<br />
Alternative<br />
L probe Sample port ABS 3/4in capped 105mm diameter,<br />
50 mm high. Part No.: 630-SP-34IN<br />
Demonstration view of “L” Probe and Sparge pipe<br />
ORDERING INFORMATION<br />
<strong>DOP</strong>610-RF-920-12 T probe for mechanical installation<br />
into 610 x 610mm filter housings.<br />
<strong>DOP</strong>610-W-920-12 T probe for welded installation into<br />
610 x 610mm filter housings.<br />
<strong>DOP</strong>305-RF-449-12 T probe for mechanical installation<br />
into 305 x 305mm filter housings.<br />
<strong>DOP</strong>305-W-449-12 T probe for welded installation into<br />
305 x 305mm filter housings.<br />
Typical HEPA Filter Safe-Change<br />
Housing into which the Longitudinal<br />
<strong>Scanning</strong> Probe may be installed.<br />
“L” <strong>Scanning</strong> <strong>Probes</strong><br />
“L” Probe with port attachment<br />
Part No. :<strong>DOP</strong>-315-L-1000<br />
“L” probe is designed for scanning safe change HEPA<br />
filter housings, and any other inaccessible filter with<br />
dimensions of 610x610mm.Shaft length of 1.0 metre<br />
will allow deeper filter areas to be scanned. The probe<br />
handle is manufactured in brass tube & the left and<br />
right hand scanning arms from aluminium.<br />
The scanning section (90 degrees to the main tube<br />
shaft) has graduated holes to ensure linear airflow into<br />
the scanning probe over the measuring distance of<br />
315mm.<br />
This scanning probe is supplied with the 630-SP-34IN-<br />
8MM scanning probe tube adaptor as standard. To be<br />
used with the 630-SP-34IN sample port.<br />
Where longer lengths of scan are required use the<br />
<strong>DOP</strong>-L-SCAN probe. This is a modular scanning probe<br />
kit with multiple length 1/2” shafts for scanning filter<br />
systems where the long shaft of the <strong>DOP</strong>-315-L-1000<br />
probe prevents access to the scanning ports.<br />
Unit 10, Protea Way, Pixmore Avenue, Letchworth, Herts, SG6 1JT Telephone: +44 (0) 1462 676446 Facsimile: +44 (0) 1462 486078<br />
Email: sales@dopsolutions.com Web: www.dopsolutions.com