DS1431 TTELEC | Alldatasheet

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 Low cost flow alarm  Simple rugged construction  Brass, BSP connections  Selectable alarm trip level (factory set)  No glands or seals  Stainless steel and other special OEM versions available PLATON FLOW ALARM TYPE LF For liquid low flow or flow failure alarm on cooling systems, water heaters or lubrication systems, the Platon LF flow switch is a rug- ged sensor with simple electrical reed switch output. Installed in a vertical line with flow upwards, normal flows lift the float in the sensor. A magnet encapsulated in the float then actuates a reed switch, giving contact closure. Should the flow drop to below the preset alarm level, the float falls to the rest position and the con- tacts open to give an alarm output. The Model LF is available in 1/2” and 3/4” line sizes, with BSP female threaded connections. Alarm rates are factory set be- tween 0.5 L/min and 10 L/min, to suit most applications. The standard unit is in brass, and has a one piece body suitable for high pressures, with no glands or seals to leak. The externally mounted reed switch has flying leads for local connection to a terminal block. Typical applications are for water supply flow failure into heaters or boilers, where the flame or power supply is cut to prevent overheating accidents, for lubricant or cutting fluid flow failure in machine tools or gearboxes. For flow failure alarm in cooling circuits, the LF flowswitch is used on X-ray equipment, electron microscopes, transformers, radio transmitters and high frequency generators. FLOW RANGES The flow trip level set on water for the different models is as follows: Connection Model Number Low Flow Trip Level 1/2” BSP 1/2” BSP 1/2” BSP 1/2” BSP 1/2” BSP 1/2” BSP 1/2” BSP 1/2” BSP 3/4”BSP 3/4”BSP 3/4”BSP 3/4”BSP LFB11L LFB12L LFB13L LFB14L LFB15L LFS11L LFS12L LFS13L LFB22L LFB23L LFB24L LFB25L

0.5 L/min

1.0 L/min

2.5 L/min

3.0 L/min

3.5 L/min

5.0 L/min

10.0 L/min

Typical hysteresis between on/off ±5% Typical accuracy of trip point ±10%

Platon Liquid Low Flow Alarm DS1431 © TT Electronics plc Issue B 7/2017 Page 2 TT Electronics | Roxspur Measurement & Control Ltd

2 Downgate Drive, Sheffield, S4 8BT, England |Ph: +44(0)114 244 2521

www.roxspur.com | sales@roxspur.com General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. SPECIFICATION Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liability for damage, injury, loss or expense caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice. Head Office: 2 Downgate Drive, Sheffield, S4 8BT, England Tel: +44(0)114 244 2521 Fax: +44(0)114 243 4838 Body Material Flow Sensor Electrical Output Switch Function Switch Rating Lead Length Pressure Rating Temperature Rating Pipe Connections LFP: Brass (CZ121) LFS: Stainless Steel LFB: Brass with encapsulated magnet LFS: Stainless Steel with encapsulated magnet in epoxy resin Encapsulated external reed switch Normally closed contact Open circuit for low flow alarm Maximum values for resistive loads: 300V, 500mA, 10W 300mm, 2 cores 70 bar maximum -20 to +105˚C Model LFB1, LFS1, 1/2” BSPP female Model LFB2, 3/4” BSPP female OPTIONS Please contact the sales office for variations to the standard specification, either in materials of construction or, for flow switches on alternative liquids or gases. When switching in- ductive circuits or high currents, the LF reed output should be used to drive a slave relay module - contact the sales office for details. DIMENSIONS Model A B C D E LFB1 LFS1 LFB2 1/2” BSPP 1/2” BSPP 3/4” BSPP 100 25.4 25.4 Notes 1. Units are constructed from square section bar, ref ‘c’ dimension. 2. Cable length 300mm, bare ends. 3. Unit should be installed vertically with direction of flow upwards.