Data Sheet Ref: 90500256 Issue: 5.5 LS-541 Liquid level float switch www.sontay.com Technical Overview The LS-541 is liquid level float switch which is intended to monitor liquid level in a tank or vessel, to provide a switched output to provide local alarm pump or valve control. The differential between switching is equivalent to approximately 10/14mm. The unit screws directly into a 1” BSPT boss. Features • IP65 Housing Specification Product Codes Mounting 1” BSPT boss Media Non-aggressive fluids with LS-541 Liquid level float switch specific gravity > 0.75 Operation For high or low level Switching differential 10/14mm Working temperature -40 to +85°C Max. liquid temperature 85°C Operating pressure 5bar max. Materials: Float Stainless steel Rod Brass Bellows Phosphor bronze Enclosure Galvanized steel sheet plate with ABS cover Switch rating 15(8)A SPDT @ 230Vac Protection IP65 Country of origin Italy International Tel: +44 1732 861225 UK Sales Tel: 0845 345 7253 Page 1 International Fax: +44 1732 861226 UK Sales Fax: 0845 345 7353 Whilst every effort has been made to ensure the accuracy of this specification, Sontay cannot accept responsibility for damage, injury, loss or expense resulting from errors or omissions. In the interest of technical improvement, this specification may be altered without notice. Data Sheet Ref: 90500256 Issue: 5.5 LS-541 Liquid level float switch www.sontay.com Installation Dimensions 1. The LS-541should only be installed by a competent, suitably trained technician, experienced in installation with hazardous voltages. (>50Vac & <1000Vac or >75Vdc & 1500Vdc) 2. Ensure that all power is disconnected before carrying out any work on the LS-541. 3. Maximum cable is 2.5mm², care must be taken not to over tighten terminals. 4. Before installation, test the float gently to ensure that the micro switch is operational. 5. Screw the LS-541 into a 1” BSPT boss, (making sure that the arrow is pointing UP) away from system elements that may cause turbulence or vibration. Ensure that the float is not obstructed in its movement after installation. 6. If the switch is to be mounted outside, it is recommended that the unit be mounted with the cable entry at the bottom. If the cable is fed from above then into the cable gland at the bottom, it is recommended that a rain loop be placed in the cable before entry into the sensor. 7. Remove the front cover by removing the 4 screws and lifting the lid separating it from the main body. 8. Feed the cable through the waterproof gland and terminate the cores at the terminal block. Leaving some slack inside the unit, tighten the cable gland onto the cable to ensure water tightness. 9. Replace the lid and tighten the 4 screws after the electrical connections have been made. Do not under any circumstances remove the protective cover without isolating the power to the switch. Connections Red Common Blue Opens on rise Earth White Closes on rise The switching point is fixed and not adjustable. International Tel: +44 1732 861225 UK Sales Tel: 0845 345 7253 Page 2 International Fax: +44 1732 861226 UK Sales Fax: 0845 345 7353 Whilst every effort has been made to ensure the accuracy of this specification, Sontay cannot accept responsibility for damage, injury, loss or expense resulting from errors or omissions. In the interest of technical improvement, this specification may be altered without notice.