HYTHEROGRAPH SENSOR SHIELDS

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various types for different usage

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Hytherographs LB-701, LB-710 and LB-712 can have different sensor shields (pollution filters). Their characteristics and usage is shown in the table below.

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.