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