LRA25
Series
TOCOS
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
Metal shaft and bushing
5% standard total resistance tolerance
Wide operating temperature of 10 C to 100 C
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
Standard Resistance Range
. . . . . . . . . . . . . 500Ω to 20kΩ
Resistance Tolerance
. . . . . . . . . . . . . . . . . . 5% standard
( 2% or 1% special order )
End Resistance
. . . . . . . . . . . . . . . . . . . . . . . . . . 0.2% max.
Resistance Taper
. . . . . . . . . . . . . . . . . . . . . . . . . . B = linear
Independent Linearity
. . . . . . . . . . . . . . . . . . .
0.5% max.
40 C
Power Rating
. . . . . . . . . . . . . . . . . . . . . .1.5 watts at
Environmental
Temperature Range
. . . . . . . . . . . . . . . . .
Temperature Characteristics
. . . . . . . . . . .
10 C to
100 C
85 C, 5 hours
without load
∆T/R
)
5%
Low Temperature Exposure
. . . 10 C, 1 hour without load
∆T/R
)
3%
Load Life
. . . . . . . . . . . .
40 C, 1,000 hours with rated load
∆T/R
)
3%
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
Moisture and Load Life
. . . . . . . . . . . . 40 C, 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
. . . . . . . . . . 350 C, 3.5 seconds
∆T/R
)
2%
Rotational Life
. . . . . . . . . 15,000 cycles with 1/2 rated load
∆T/R
)
3%
∆T/R
= Total Resistance Change
Mechanical
Mechanical Travel
. . . . . . . . . . . . . . . . . . . . . . . . . . 300
5
Shaft Torque
. . . . . 70.2 to 306 gf
•
cm (0.973 to 4.242 oz
•
in)
Stop Strength
. . . . . . . . . . . . 10.2 kgf
•
cm (141.4 oz
•
in) max.
Mounting Nut Torque
. . . . . . 15 kgf
•
cm (207.94 oz
•
in) max.
Solderability
. . . . . . . . . . . . . . . . . . . . . . . 235 C, 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
E-mail: sales@tocos.com
www.tocos.com
61
LRA25 Series
LRA25
Panel Mount, Single Unit, Single Shaft
Right Angle Ear-Lug Terminals
Dimensions
Unit: mm
Recommended
Panel Mounting Holes
Part Numbering System
L
RA 25
20
S
B
103
J
NOTE: FMS = From Mounting Surface
Resistance Tolerance: J
=
G
=
F
=
5% (standard).
2% (special order ).
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
)
500
Code
501
Resistance (
Ω
)
1,000
2,000
5,000
Code
102
202
502
Resistance (
Ω
)
10,000
20,000
Code
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.
62
1177 East Tower Road, Schaumburg, IL 60173
TOCOS
AMERICA, INC.
Tel: 847-884-6664
Fax: 847-884-6665
E-mail: sales@tocos.com
www.tocos.com
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