PDF

TOCOS
®
LRA25 Series
PA N E L C O N T R O L S
25mm Diameter, Single-Turn, Wirewound Industrial Panel Controls
LRA25
Features
25mm diameter, single-turn industrial panel controls Wirewound element High linearity, 0.5% max.
Single unit, single shaft Linear taper 5% standard total resistance tolerance Metal shaft and bushing
Wide operating temperature of 10C to 100C Panel mounting style only Right angle ear-lug terminals
6mm diameter shafts in slot, flat or round end styles Standard 20mm shaft length
Specifications
Electrical
Environmental
Standard Resistance Range . . . . . . . . . . . . . 500Ω to 20kΩ
Temperature Range . . . . . . . . . . . . . . . . . 10C to 100C
Resistance Tolerance . . . . . . . . . . . . . . . . . . 5% standard
(2% or 1% special order )
Temperature Characteristics . . . . . . . . . . .85C, 5 hours
without load
∆T/R )5%
End Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2% max.
Resistance Taper . . . . . . . . . . . . . . . . . . . . . . . . . . B = linear
Independent Linearity . . . . . . . . . . . . . . . . . . . 0.5% max.
Power Rating . . . . . . . . . . . . . . . . . . . . . .1.5 watts at 40C
Insulation Resistance . . . . . . .100MΩ minimum at 500VDC
Dielectric Strength . . . . . . . . . . . . . . . . . . 500VAC, 1 minute
Theoretical Resolution
Resistance ( Ω )
500
1,000
2,000
Resolution ( % )
0.27
0.21
0.17
Resistance ( Ω )
5,000
10,000
20,000
Resolution ( % )
0.12
0.08
0.09
Mechanical
Low Temperature Exposure . . .10C, 1 hour without load
∆T/R )3%
Load Life . . . . . . . . . . . . 40C, 1,000 hours with rated load
∆T/R )3%
Moisture and Load Life . . . . . . . . . . . .40C, 90-95%RH,
500 hours with 1/10 rated load
∆T/R )5%
Vibration . . . . . . . . . . . . . . . . . . .10-55Hz, 1.5mm amplitude,
2 directions, 2 hours each
∆T/R )1%
Soldering Heat Resistance . . . . . . . . . . 350C, 3.5 seconds
∆T/R )2%
Mechanical Travel . . . . . . . . . . . . . . . . . . . . . . . . . . 3005
Rotational Life . . . . . . . . . 15,000 cycles with 1/2 rated load
∆T/R )3%
Shaft Torque . . . . . 70.2 to 306 gf • cm (0.973 to 4.242 oz • in)
∆T/R = Total Resistance Change
Stop Strength . . . . . . . . . . . . 10.2 kgf • cm (141.4 oz • in) max.
Mounting Nut Torque . . . . . . 15 kgf • cm (207.94 oz • in) max.
Solderability . . . . . . . . . . . . . . . . . . . . . . . 235C, 3 seconds
Marking . . . . . . . . . . Taper, resistance, resistance tolerance,
terminal identification, date code
TOCOS AMERICA, INC.
1177 East Tower Road, Schaumburg, IL 60173
Tel: 847-884-6664
Fax: 847-884-6665
61
E-mail: [email protected]
www.tocos.com
LRA25 Series
Dimensions
LRA25
Unit: mm
Panel Mount, Single Unit, Single Shaft
Right Angle Ear-Lug Terminals
Recommended
Panel Mounting Holes
Part Numbering System
L
RA 25
20
S
B
103
J
NOTE: FMS = From Mounting Surface
Resistance Tolerance: J = 5% (standard).
G = 2% (special order ).
F = 1% (special order ).
Resistance Code: Expressed in ohms. A three digit code where the first
two digits are significant figures, and the third digit indicates the number
of zeros that follow these figures (i.e., 100 = 10Ω; 101 = 100Ω; 102 = 1,000Ω;
103 = 10,000Ω; 105 = 1,000,000Ω ). See table for standard resistance values.
Resistance Taper: B = Linear.
Shaft End Style: S = Slotted.
F = Flatted.
R = Round.
Standard Shaft Length: 20 = 20mm FMS.
Up to 50mm shaft length available (special order ).
Size: 25 = 25mm Diameter.
TOCOS Series Name: RA = Wirewound Element.
Linearity: L = High Linearity, 0.5% Max.
Standard Resistance Values and Part Numbering Codes
Standard Nominal Total Resistance Values and Part Numbering Codes
Resistance ( Ω )
Code
Resistance ( Ω )
Code
Resistance ( Ω )
Code
500
501
1,000
2,000
5,000
102
202
502
10,000
20,000
103
203
Refer to Shaft End Styles Specifications and Hardware Specifications for details and availability.
For additional information, refer to Guidelines and Precautions for Using Panel Controls.
TOCOS AMERICA, INC.
62
1177 East Tower Road, Schaumburg, IL 60173
Tel: 847-884-6664
Fax: 847-884-6665
E-mail: [email protected]
www.tocos.com