TRITON CONTROLS - FLOAT SWITCHES LR02IS. ATEX APPROVED ZONES 1 & 2 NON MERCURY LEVEL REGULATORS Float Switches are inexpensive and efficient liquid level detectors, simple to install, designed for trouble free operation over a long life. The LR02-IS is a variant of the LR-02 series, contains a special O 4 1 low voltage/low current microswitch that is compatible with the voltage and current requirements of intrinsically safe systems. Construction O 9 The unit comprises three major components : 1. The float chamber houses the microswitch arrangement, totally sealed within closed cell polyurethane foam, with a single pole double throw action. Outer walls of the switch are moulded in Hypalon, CSP Synthetic rubber. 2. The three-cored cable, connected to the microswitch assembly inside the float chamber, is sheathed in CPE synthetic rubber. This cable is supplied in three standard lengths, 5 metres, 10 metres and 20 metres 5% of the length quoted. 3. A stabilizing weight fixed to the cable approximately 120 mm from the float chamber is also coated in Hypalon. Hypalon Du Pont de Nemours, Wilmington, Delaware. Mounting B L U E M I C R O S W I T C H There are no hard and fast rules applicable to mounting these units, B L A C K however the lead should be supported in an enclosed vessel, and in B R O W N an open vessel it is advantageous to clip the lead to the side S T E E L B A L L especially if excessive turbulence is experienced. To obviate the effects of rapid switching conditions that would result if such turbulence is experienced, it is advantageous to use a maintaining circuit which both safeguards the microswitch and cuts out any chatter of the starters of associated pumps etc. O 9 1 TRITON CONTROLS LTD., UNIT 2, RANDOLPH INDUSTRIAL ESTATE, EVENWOOD, BISHOP AUCKLAND, Co. DURHAM, DL14 9SJ, ENGLAND. TEL +44 (0) 1388 833000 FAX +44 (0) 1388 833680 Web : www.tritoncontrols.co.uk Email : info tritoncontrols.co.uk 1 7 4 C A B L E L E N G T H W E I G H T 1 2 0 1 2 4LR02-IS. NON MERCURY FLOAT SWITCH Method of Operation Specification The microswitch assembly inside the float, axially Max Input Parameters: Ui = 30V, Ii=100mA mounted in line with the weight, changes contacts 8v, 8mA dc minimum contact rating according to the floats position, as in the diagram suitable for IS system inter-face below. Therefore as the liquid level drops or rises slowly, a pump or flow control suitably connected, Max. temperature 70 C can be switched in or out to maintain an average level of the liquid. By connecting only one side of Max. submerged depth 20 metres the switch, the unit can be also used to fill or empty the tank as required. Compressive Strength 482 KN/m (70 lbf/in) Dimensions, in mm, do not take into consideration any Operational in specific gravities from 0.8 to 1.3 lateral swing of the cable. C O N T A C T B E T W E E N B R O W N A N D B L A C K L E A D S I S M A D E Chemical Resistance 4 5 Against Rating Lubricants Fair Diesel oil & petrol Poor Vegetable & animal fats Good Water Absorption Good 2 8 0 M I N . Oxidation Good 3 3 0 M I N . O P E R A T I V E D E P T H Ozone Good Sunlight Good 4 5 Dilute Acids Good Alkalis Good C O N T A C T B E T W E E N B R O W N A N D B L U E L E A D S I S M A D E Alcohols Good Salt water Good O P E R A T I N G P O I N T S A R E A P P R O X I M A T E O N L Y A comprehensive list of chemical resistances is Float Switch series LR02-IS is subject to available on request. the limitations contained within the Product Approval: When ordering please specify part numbers. II 2G, EEx ia C T6II Ambient temperature -20 to +70C Type Part Number Weight (approx) 5 metre cable LR02IS-L05M 1.3 Kg Type LR02-IS ( Certificate SIRA 04ATEX2187) 10 metre cable LR02IS-L10M 1.8 Kg may be used in zones 1 and 2 with flammable gases 20 metre cable LR02IS-L20M 2.8 Kg and vapours with apparatus groups IIA, IIB, & IIC and with temperature classes T1, T2, T3, T4, T5 & DISTRIBUTED BY. T6. The equipment is certified for use in ambient temperature range 20C to +70C and should not be used outside this range. TRITON CONTROLS LTD., UNIT 2, RANDOLPH INDUSTRIAL ESTATE, EVENWOOD, BISHOP AUCKLAND, Co. DURHAM, DL14 9SJ, ENGLAND. TEL +44 (0) 1388 833000 FAX +44 (0) 1388 833680 Web : www.tritoncontrols.co.uk Email : info tritoncontrols.co.uk LR02-IS-LFT2 Iss 01 Date: 090604