SYSTEMS AND PARTS EARTHING CONTROL: TES-01. Background. Product. Functioning SYSTEMS AND PARTS - EARTHING CONTROL

Transcription

1 Background When combustible products are loaded/off-loaded from a tanker truck there is a risk of an explosion occurring due to ignition caused by a static discharge from the truck itself. To prevent this occurring the truck must be connected to earth and fully discharged before loading can proceed. Product EX version Truck Earthing system TES-01 Advantages Safe discharge of electrostatic charge Measurement of the resistance seen at the clamp Verification that the capacitance is correct for a tanker truck. Red/green indicators for visual status indication of the earth connection Interlock to conveying system via a volt-free contact Bypass of the capacitance mode for operation in extreme wet conditions. Suitable for 240VAC and 24VDC power supply systems. To ensure that loading cannot take place without the truck being earthed, a monitoring system is required to ensure that a good connection has been made to the truck by means of a clamp, the earth monitor will then allow the conveying process to be started by means of a relay. For an earth monitoring system to be effective it must be able to distinguish between a connection to a truck and any other metallic body such as ductwork, girders, cable trays etc. In order to make the distinction, the Truck earthing System TES-01 measures the capacitance of the metal body connected to the clamp, it checks whether the capacitance is correct for a truck, and finally provides both visual indication and the closing of a relay contact when the capacitance is correct. Functioning The Truck Earthing System TES-01 is designed to detect a low resistance connection across the jaws of the clamp. When a connection is detected the unit safely discharges any electrostatic charge through a resistor to prevent sparking. The control unit then checks the capacitance seen at the clamp. If the capacitance is correct for a tanker truck then the green indicator will be lit and the interlock relay will change state to allow conveying of the product. The unit will then provide a low-resistance connection to earth to prevent the further build-up of electrostatic charge. The connection across the jaws is the continually monitored during the conveying process. If the connection is broken the unit will switch back to the RED NOT-CONNECTED state and conveying will be halted by means of the interlock relay. IP version with CM1 clamp, clamp station and spiral cable Cable reel DS_S&P-TES01_SI_13_01_EN

2 System description Active clamp CL1 Active clamp CM1 The basic system consists of a control unit, an earth clamp and a cable (as an option a cable reel is also available). The earth clamp is active ' With active clamps, both clamp jaws are insulated from each other and from the clamp body. As long as the clamp is not connected to a conductive body, the circuit between the clamp jaws stays open. Once the clamp is connected, the circuit is closed. The cable reel The cable reel is equipped with cable and an automatic roll-up mechanism. Intended use The control unit, the intrinsically safe measuring circuit and that circuit s components (clamp, plug connection and cable reel) are ATEX certified. Depending on the type, the system can be set up in Ex zones 1, 2, 21, 22 or in an industrial environment IP 65. Clamp station Clamp hook Technical specifications For more details on this product, we refer to the technical datasheet. StuvEx retains the right to make changes without prior notice

3 Application Characteristics TES-01 Specific use for Tanker Trucks on tyres Recognition Functioning Capacitive In addition to low resistance R, the truck s capacitance C is measured With proper earthing the control unit is triggered (the green signalling lamp lights and the potential free contact for interface change state) Power supply VAC +10% / -15% - 50/60 Hz, auto-ranging Or 24 VDC +20% % / -20% Consumption: max 20W Ambient temp module -20 C to + 60 C Ambient temp unit -10 C to + 40 C Humidity level 95% at 20 C (non condensing) Remote signalling Volt free contact 8A at 250VAC / 30VDC, NO IP version Signalling lamps Operating Guaranty ATEX Certification Red light: no earth connection Green light: correct earth connection SIL2 / report Technis Reliability Study T533 The measurement and earth connection circuit is intrinsically safe EEx I and suitable for use in ATEX zone 0 and 20 Versions Type TES-01 / Ex TES-01 / IP ATEX For Ex zones 1, 2 (gas) For Ex zone 22 (dust) 21 and 22 (dust) and non hazardous areas CE Ex II 2(1) GD Ex d [ia Ga] IIC T6 Gb Ex tb [ia Da] IIIC T85C Db IP66 CE Ex II 2 (1)D Ex tb [ia Da] IIIC T135 C Material Cast aluminium Painted mild steel with stainless steel front plate Finish Grey coloured coating painted, RAL 7035 Dimensions 230 h x 230 w x 150 d 300 h x 200 w x 150 d Weight 10 Kg 5 Kg Connections 4 pieces M20 x 1 3 pieces for M20 Bypass Optional Integrated Protection degree IP 66 IP 66 EX version DS_S&P-TES01_SI_13_01_EN

4 Active clamp CL1 Active clamp CM1 Clamp station Clamp hook StuvEx retains the right to make changes without prior notice Type CL 1 Type CM 1 Accessories Earth connection clamps Description Large size: 260 mm, aluminium Jaw opening: min 3, max 15 mm. Medium size: 210 mm, stainless steel Jaw opening: min 3, max 35 mm Accessories Delivered with loose plug connection ATEX Passive EEx i component for Ex zone 0, 20 II 1GD Ex c, ia IIC, IIIC T6 T85 C Clamp Station / Clamp Hook Material Casing in RVS 304 Support: acetal Weight 0,20kg Type SP1/10 10m Spiral cable Application For extreme industrial environments For industrial use Cable on reel Type CR 1 / 65 Closed cable housing in aluminium, pivotable on bracket. Shock and weather resistant Spring activated automatic winding, with blocking mechanism Degree of protection IP 65 Weight 12 Kg Cable 24 meters H05RN-F2 x mm² ATEX Passive EEx i component and mechanical equipment for Ex zone 1, 21 II 2GD Ex c, ia IIC, IIIC T6 T85 C Type CO 01 / 10 Cable without reel 10 meters H05RN-F2 x mm²

5 Part number Main Components Product Description TES-01/IP, Control Unit TES-01/EX, Control Unit CL1, active clamp CM1, active clamp Spiral cable, 10m, SP1/ CO1/10, 10m flying cable (without cable reel) CR1/65, Cable reel with 24m cable (optional) Remote key switch for TES-01/EX (optional) Clamp station (optional) Clamp hook (optional) Unit version Ex Cable Reel Unit version IP All dimensions are in mm