LRNH51024-007 Datasheet LRNH30S12, LRNV30S02, LRNH51S42 | P1-P3

LRN Series

Reed float switch

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.

Typical applications

• Low coolant level sensing

• Fuel or oil level sensing

• Boiler level warning

• Solution monitoring

• Flood control

• Catering and vending machine

• Domestic appliance

• Medical equipment

Mechanical

Minimum operate angle 5° from mounting angle

(horizontal models)

Maximum release angle 40° from mounting angle

(horizontal models)

Shock * 50 g for 11 milliseconds duration

Vibration * 35 up to 500 Hz

Nominal cable length 0.5 m

Environmental

Nylon 6.6 Diecast metal** Glassfilled****

body polypropylene

Operating Temperature Range -30 °C to -30 °C to -30 °C to

+130 °C +130 °C +110 °C

Minimum SG of liquid 0.85 0.85 0.65

Minimum Viscosity of Liquid 100 100 100

(centipoise)

Plastic Housing Water

absorption of equilibrium

at 20 °C and 100 % RH 1.3 % 5.6 % 0.03 %

at 100 °C and 100 % RH 1.6 % 5.6 % <0.5 %

Heat distortion temperature 180 °C 245 °C 105 °C

4.5 kg/cm

(67.6 psig)

Electrical

Switching options 0 1 2 3 4 5

Switch action SPST SPST SPDT SPST TRIAC TRIAC

Maximum Switching Voltage

(Vdc) 100 100 100 100

(VRMS) 120 250 70 120 250 250

Maximum Switching Current (A) 1.0 1.0 0.50 3.0 3.0 1.0

dc Contact Rating (W) 15 *** 15 *** 3 *** 100 *** 750 250

Minimum Breakdown Voltage

(Vdc) 300 800 200 400 - -

Initial Contact Resistance (Ω) 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

Technical information

Emergency cut out

Low level

High level

Ordering information

987654321LRN -

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

7, 8, 9 Customer specials

Mounting information

Care must be taken to ensure that the product is not

damaged due to excessive tightening of the fixing nut or

threaded bush.

Maximum torque limits are shown below.

Model Torque limit Maximum container

wall thickness

External fitting

(compression grommet) 2.0 lb ft (2.67 Nm) 0.16ins (4 mm)

See Note 1

External fitting (1/2" NPT) 5.0 lb ft (6.75 Nm) 1.00ins (25 mm)

See Note 2

Internal fitting 3.0 lb ft (4.0 Nm) 0.394ins (10 mm)

Internal fitting (1/4" NPT)

into tapered bush 5.0 lb ft (6.75 Nm) 0.50ins (12.7 mm)

through tank wall

with nut and washer 3.0 lb ft (4.0 Nm) 0.12ins (3 mm)See

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.

Mounting position Stem position must be vertical ± 15°

(vertical & right angle models)

Mounting position ± 30° from horizontal

(horizontal models)

Dimensions in inches (mm)

LRN - Horizontal models

External fitting 1/2" NPT

(American National Pipe Thread)

Internal fitting 1/4" NPT

(American National Pipe Thread)

Internal fitting External fitting (compression grommet)

Installation hole size

P1-P3 P4-P4

LRNH51024-007

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Description:

Liquid Level Sensors Liquid Level Sensor

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LRNH51024-007

LRNH51024-007

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