LRN Series Reed float switch Technical information Mechanical Minimum operate angle (horizontal models) 5 from mounting angle Maximum release angle (horizontal models) 40 from mounting angle Shock * 50 g for 11 milliseconds duration Vibration * 35 up to 500 Hz Nominal cable length 0.5 m Environmental Nylon 6.6 Operating Temperature Range Features * High or low level sensing * Normally open, normally closed or change over contact action * Ratings up to 100 W * Operates in liquid down to S.G. of 0.65 * Internal or external fitting * Easy to install * Cost effective Description The Honeywell range of horizontal, vertical and right angled float switches offers the design engineer a combination of versatility and reed switch reliability. A magnet located in the float is used to activate the reed switch either on a rising or falling liquid level and the design allows for high or low level sensing simply by rotating the switch through 180. A range of internal or external mounting options is available and a universal mounting kit allows both internal and external mounting. Available in Nylon 6.6 and Glass Filled Polypropylene materials and a range of switching options. LRN float switches are suitable for use in the automotive, chemical, petroleum and food processing industries in signalling and control applications. -30 C to +130 C -30 C to +130 C -30 C to +110 C Minimum SG of liquid 0.85 0.85 0.65 Minimum Viscosity of Liquid (centipoise) 100 100 100 1.3 % 1.6 % 5.6 % 5.6 % 0.03 % <0.5 % 180 C 245 C 105 C Plastic Housing Water absorption of equilibrium at 20 C and 100 % RH at 100 C and 100 % RH Heat distortion temperature 4.5 kg/cm2 (67.6 psig) Electrical Switching options Switch action Low coolant level sensing Fuel or oil level sensing Boiler level warning Solution monitoring Flood control Catering and vending machine Domestic appliance Medical equipment 1 2 3 4 5 100 120 100 250 100 70 100 120 250 Maximum Switching Current (A) 1.0 1.0 0.50 3.0 3.0 1.0 3 *** 100 *** 750 250 dc Contact Rating (W) 15 *** 15 *** 250 Minimum Breakdown Voltage (Vdc) 300 800 200 400 - - Initial Contact Resistance () 0.25 0.25 0.25 0.75 - - * Reed Switch Only ** Diecast metal model is fitted with Nylon 6.6 float as standard *** The switching performance can be drastically affected if switch ratings are exceeded. For inductive, capacitive and tungsten filament lamp loads, derate by 50%. All switch ratings are at dc resistive loads. **** For boiling water applications the maximum operating temperature limits are:Continuous boiling water 80 C Non continuous boiling water 100 C Emergency cut out High level Low level 48 0 SPST SPST SPDT SPST TRIAC TRIAC Maximum Switching Voltage (Vdc) (VRMS) Typical applications * * * * * * * * Diecast metal** Glassfilled**** body polypropylene Ordering information LRN 1 Type of orientation H Horizontal V Vertical R Right angled 2 Housing material 3 Nylon 6.6 (-30 to 130 C) 4 Diecast metal body (-30 to 130 C) 5 Glass filled Polypropylene (-30 to 110 C) 3 Switching options 0 S.P.S.T. 120 Vrms/1 A (15 W) 1 S.P.S.T. 250 Vrms/1 A (15 W) 2 S.P.D.T. 70 Vrms/0.5 A (3 W) 3 S.P.S.T. 120 Vrms/3 A (100 W) 4 Triac 250 Vrms/3 A 5 Triac 250 Vrms/1 A 4 Seal washer / Grommet S Silicone N Nitrile 5 Mounting options 0 M16 x 2 internal fit 1 M16 x 2 external fit (compression grommet) 2 1/2" NPT external fit 3 1/4" NPT internal fit 4 Universal kit (internal and external assemblies) 6 Termination 1 0.5 m PVC insulated leadwire 2 2 m PVC insulated leadwire 3 5 m PVC insulated leadwire 4 2 m two core cable 1 2 3 4 5 6 - 7 8 9 7, 8, 9 Customer specials Mounting information Mounting position (vertical & right angle models) Stem position must be vertical 15 Care must be taken to ensure that the product is not damaged due to excessive tightening of the fixing nut or threaded bush. Mounting position (horizontal models) 30 from horizontal Maximum torque limits are shown below. Model Torque limit Maximum container wall thickness External fitting (compression grommet) See Note 1 2.0 lb ft (2.67 Nm) 0.16ins (4 mm) External fitting (1/2" NPT) See Note 2 5.0 lb ft (6.75 Nm) 1.00ins (25 mm) Internal fitting 3.0 lb ft (4.0 Nm) 0.394ins (10 mm) 5.0 lb ft (6.75 Nm) 0.50ins (12.7 mm) 3.0 lb ft (4.0 Nm) 0.12ins (3 mm)See Internal fitting (1/4" NPT) into tapered bush through tank wall with nut and washer See Note 2 Notes: 1. The compression grommet is suitable for a seal pressure of 70 psi. 2. When using a 1/2" NPT external fit version, the container wall thickness must not exceed the length of male thread section of the switch. Some pipe fittings have a small diameter outside the thread area which will restrict entry. This switch is designed to pass through a 1/2" NPT tap drill 0,718" diameter. Because the mounting bush is usually metal and the switch is usually moulded plastic, care must be taken when using the 1/2" or 1/4" NPT versions not to over tighten since this will cause damage to the switch. A sealant such as PTFE tape should always be used on the NPT versions. Ensure that the position orientation arrow on the 1/2" NPT version is vertical. 3. The float assembly on the horizontal models should never be removed since this will affect the switching characteristics. 4. To reverse the switching action on horizontal models, simply rotate through 180 observing orientation indicator or arrow. On vertical and right angled models, compress the float stop arms, remove and reverse the float and reassemble. Movement of the float in the direction of the position indication arrow closes the switch contacts at the end of float travel. 49 Dimensions in inches (mm) LRN - Horizontal models External fitting (compression grommet) Installation hole size Internal fitting Installation hole size External fitting 1/2" NPT Internal fitting 1/4" NPT (American National Pipe Thread) (American National Pipe Thread) Installation hole size 50 Dimensions in inches (mm) LRN - Vertical models External fitting (compression grommet) Internal fitting LRN - Right angle models External fitting (compression grommet) Internal fitting 51