A www.stauff.com/10/en/#21 21 Level-Temperature Switch Type SLTS Characteristics The STAUFF Level-Temperature Switches (SLTS Series) are unique in their design and modularity. One of the greatest advantages is the ability of the end-user to adjust the switching level. The internal support wire carrying the level and temperature switches makes it a simple and quick job to change the level switch position. Level contact positions (L, H) are set as given in the order code. They can be adjusted individually later on. Please consider a minimum distance of 40 mm / 1.57 in between the switching points. Features Suitable for Mineral Oil and HFC fluids, other fluids on request Either 1 or 2 level contacts available 1 integrated temperature switch (optional) Standard electrical function: Level contacts: Normally closed, opens with falling level Temperature contacts: Normally closed, opens with rising temperature STAUFF Level-Temperature Switches SLTS are available with other electrical functions on request. Options 1 NPT and others availble on request max. 115 Volt switching (for thread N16 only) Deutsch Adaptor Cable Please see page 20 for details. Materials Stem: Brass Float/Sealing: NBR (Buna-N®) Max. operating temp.: +80 °C / +176 °F Electrical Data and Output Max. current level contact: 0.5 A Max. current temp. contact: 2.0 A Contact load level contact: 10 VA Max. operating voltage: (See ordering code) Specific gravity of fluid: ≥0,8 kg/dm3 Hysteresis: +18 °C / +64.4 °F Protection Rating IP 65 protection rating: Dust tight and protected against water jets SLTS - 12 - O - H41 - L251 - B12 - G048 - M12 Order Codes aSeries and Type Level-Temperature Switch SLTS bStem Length L1: 305 mm / 12 in L2: 251 mm / 9.88 in 12 L1: 457 mm / 18 in L2: 403 mm / 15.87 in 18 cSwitching Temperature Without temperature switch 0 +60 °C / +140 °F 060 +70 °C / +158 °F 070 dH (Upper Level Contact) Without upper level contact 0 41 mm / 1.61 in H41 Dimensional drawings: All dimensions in mm (in). eL (Lower Level Contact) Without lower level contact 0 251 mm / 9.88 in (SLTS-12 only) L251 403 mm / 15.87 in (SLTS-18 only) L403 fThread Connection G3/4 (standard option) B12 1 NPT N16 Note: Others on request gVoltage (Volt AC/DC) 48 Volt max. (standard option) G048 115 Volt max. (for thread N16 only) G115 hElectrical Connection similar DIN VDE 0627 / IEV 61984 CB M12 pin terminal M12 Contact Life Time Due to their design Reed contacts have a very high life expectancy. However, it is worthwhile to note the following information. Contact Protection To reduce the high reverse voltage produced when a reed switch opens, the following contact protection can be applied. DC voltage: a diode parallel to the load, see figure A AC voltage: a RC-network parallel to the load, see figure B and table below Open contact voltage V 10 VA 25 VA 50 VA 75 VA 100 VA R (Ω) C (µF) R (Ω) C (µF) R (Ω) C (µF) R (Ω) C (µF) R (Ω) C (µF) 24 22 0,022 1 0,1 1 0,47 1 1 1 1 48 120 0,0047 22 0,022 1 0,1 1 0,47 1 0,47 110 470 0,001 120 0,0047 22 22 22 0,047 22 0,1 A Contact Last load Protective diode B Contact Last load RC-Network Catalogue 10 § Edition 01/2024 Fluid Level and Temperature Indicators Hex 36 M3 ground 34 (1.34) 16 (.63) 45 (1.77) 41 (1.61) L2 L1 Upper level contact H Lower level contact L2 G 25 (.98) Ø 23,5 (.93) 23,5 (.93) Ø 11 (.43) (1.42) (.14) 3.5 1 2 345 Hex 36 M3 ground M12x1 16 (.63) 45 (1.77) 41 (1.61) L2 L1 Upper level contact H Lower level contact L2 G 8,5 (.33) Ø 23,5 (.93) 23,5 (.93) Ø 11 (.43) (1.42) (.14) 3.5 Schemes for float in low position two level contacts one temperature contact J H L Wiring Scheme (CB) two level contacts one temperature contact 3 2 4 +1 J L H 2 3 4 +1 Wiring Scheme (M12) J L oder H 2 3 +1 one level contact one temperature contact J L oder H 2 3 +1 one level contact one temperature contact
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