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FTB-420 Series
Low Flow Turbine
Prior to Installation, con firm s yst e m vers u s se n sor s p e c i f i c a t i o ns an d m edi a com patibil i t y o f s e n s o r . The s yst em
nee d s to be f i l t e re d to 50 m i c r o ns p r i o r t o the sensor, a nd p u l s e s / w a t er h a m m e r effe c t s shou l d be m i n i mized to p revent
uni t dam age. O b serv e arr o w o n b ottom o f unit f o r cor r e c t inlet and o u tl et p o rt. S e nsor c a n be m ount e d in a n y hori zon tal,
vert i c a l , or sk ewed or i entat i o n. Corre c t l y i n s t alled , the sensor works m aintena n c e -free .
Installation
1/4 " N P T U nits : A p p l y a s p a r se a m oun t of thread s e a l a n t (Perm a t e x "No More L e a k s" ®) o r T eflon® t a p e t o male t h r ead s .
In s u r e that s e alan t do e s not e nt e r into t h e turb i ne a n d bearing i nter n al area. H a n d - t i ghten u ni t in p l a c e . Turn a n addi t i o n-
al 1 / 4 turn t o p r o vi de s eal. If s e a l l e ak s , turn a n a d ditional 1/4 t urn until leak stops . Do not ex cee d one additiona l t urn
tot a l.
G 1/4 U n i t s : G 1 /4 uni t s mate wi th a f l at fac e s eal washe r (7 0 s hore , 7 m m ID, 1 3 m m OD, 2, 0 m m t hick) s i m i l a r t o a g a r-
den h os e a r r ang em e nt. This arr ange m ent r e q u i r e s no s e alants; hand -tight e n i n g s h o u l d be s ufficient f o r se a l i ng.
Electrical/Output Signal
The ou t p ut sig nal is a s q u are wave s i g n a l , wh o s e frequenc y var ies linea r l y wi t h fl o w rate. An e xtern a l p u l l -u p r esistor
(us e r -sup p l i e d ) i s req uired to insure t h a t t h e o p en c oll ector will sink less tha n 20 mA .
The produc t is de s i g n e d and m a nufactu red in ac c ord a n c e with Sou n d Eng i n e eri n g Prac t i c e a s defi n e d by th e Pre s s u r e
Equipm ent D i r ective 9 7 /23/EC. T his p r o duct m ust n ot b e used as a “saf e t y accessor y” as def i ned b y the P r essu re E qui p -
ment Directi ve, Article 1, Paragraph 2 . 1.3. The pres ence of a C E Ma r k on the unit doe s not rel ate to the Pressure Equip-
ment Dire c t i v e .
Important Points:
Produ c t must be m ainta i n e d a n d in s t a l l e d in stri c t a c c ord anc e with
the Na t i o n a l Elec t r i c a l Co de an d OME G A te c h n i c a l br oc h u r e and in -
stru c t i o n b ulletin. F ailure to observe this wa rning could resul t in s e ri-
ous i n j u ri es o r damages.
Press u r e and tem per ature li m i t a t i o ns sh o wn on in d i v i d ual ca t a l o g
pag e s a n d d r a wi ngs for the s pecified f l o w s e nsors must
not b e e xc e e d e d .
Selecti o n o f m aterials f or com patibilit y wi t h t he m e d i a is critical to the
life an d opera t i o n of O MEGA flow s e ns o r s. Tak e care in t h e pr ope r
selec t i o n of materi als of co n s t ruction; p a rticularl y wette d materi als.
Flow sens ors h ave b e e n des i g n ed to resist shock a nd v i b r atio n ; how-
ever , s hock and vibration s hou l d be m inimize d .
Liqu i d media c o n tainin g p a r t i c ul a t e a n d/o r deb ris s h o u l d b e filte red to
ens u r e p r o p e r o peration of O ME GA produ c t s .
Flow s e n s o r s m u s t not be fi eld r epa i r e d.
Ph ys i c a l dam age sust ained b y t he product m a y re n der it u n ser v i c ea-
ble.
M-5171/1112
Specifications
Wetted Parts
Body: Nylon 12
Turbine: Nylon 12
Composite Bearings: PTFE/15% Graphite
Operating Pressure
350 psi (24 Bar)
Burst Pressure
1400 psi (100 Bar)
Operating Tempera-
ture
-4° to 212°F (-20° to 100°C)
Viscosity
32 to 80 SSU (1-15 Centistokes)
Filter
< 50 Microns
Input Power
5-24 VDC @ 8 mA
Output
NPN Sinking Open Collector @ 20 mA, Max.
Accuracy
± 3% of Rdg. Normal Range
Repeatability
0.5% FS Normal Range
Electrical Connection
Din Connector (2 Poles + Ground)
Dimensions
.86”
(22mm)
1.78”
(45 mm)
Part Number Port
Flow Ranges Frequency Pulses
GPM LPM Per Gallons Per Liters Output
FTB-421G G 1/4 0.03 - 0.66 0.1 - 2.5 83200 22000 37 - 917 Hz Nylon 12
FTB-421 1/4” NPT 0.03 - 0.66 0.1 - 2.5 83200 22000 37 - 917 Hz Nylon 12
FTB-422G G 1/4 0.03 - 0.66 0.1 - 2.5 83200 22000 37 - 917 Hz Nylon 6
FTB-422 1/4” NPT 0.03 - 0.66 0.1 - 2.5 83200 22000 37 - 917 Hz Nylon 6
Wiring Diagram
10K - 30K Ohms
Customer Supplied
240328 rev B
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