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| SENSOR SHIELDS - POLLUTION FILTERS | ||||||
|---|---|---|---|---|---|---|
| Type |
Usage |
Construction |
Holes |
Time
constant |
Level
of casing protection |
Picture |
| F1 |
To be used in very clean places
i.e. rooms, laboratories, very short response time. |
Basket with ABS, provides basic
mechanical sensor protection without protection against pollution. Does
not protect from dust. |
2.5mm |
5 s | IP30 |
|
| F2 |
To be used in very clean places
i.e. rooms, for humidity measurements in quickly changing conditions,
short response time. |
Basket with ABS, with an
internal net filter made out of stainless steel or brass, protects the
sensors from bigger parts of pollution matter. Does not protect from
dust. |
0.4mm |
7 s |
IP40 |
|
| F3 |
To be used in places with
average level of pollution i.e. warehouses, production areas, in use
HVAC. average response time. |
Basket with ABS with an internal
net filter made out of stainless steel or brass (mechanical protection)
and a liquid protection filter made out of polypropylene cloth, water
resistant and stem permeable (anti dust protection). |
20 um |
15 s |
IP50 |
|
| F4 |
To be used in very polluted
places i.e. dirty places, open space. Long response time. |
Basket made out of teflon sinter
(porous). Water resistant. |
40 um |
20 s |
IP65 |
|
| F5 |
To be used in hard conditions,
serious mechanical stresses. Possible to be used only in hytherographs
series LB-710 and LB-712. Very long response time, not
recommended with precise measurements in quickly changing humidity or
temperature conditions (because of filter big heat mass). |
Basket made out of brass sinter
(porous). |
60 um |
30 s |
IP40 |
|
Time constant provides an approximate time after which hytherograph's reading is going to change for 70% of the humidity or temperature jump value, if the air flow speed surrounding the hytherograph amounts to 1 m/s.
 |
Produced by: LAB-EL Laboratory Electronics 68b, Bodycha Str., 02-495 Warsaw tel: (022) 667 71 18, 0601 209656, fax: (022) 867 53 32 e mail: info@label.com.pl home page: http://www.label.com.pl internet meteorological station: http://www.meteo.waw.pl meteorological station on a mobile phone: wap.meteo.waw.pl Last updated: 09.09.2004 |
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