SL BLOCKTHERM - Self-limiting Block Heater - Brochure

INTERTEC-Hess GmbH · Raffineriestraße 8 · D-93333 Neustadt/Donau · Tel: +49 (0) 9445/95 32-0 · Fax: +49 (0)9445/95 32 32www.intertec.infoSL BLOCKTHERM Self-limiting Block Heater HD660-5e-SL BLOCKTHERM page 1 / 2 1 Application The self-limiting electric conduction heater is designed to be attached directly to manifolds, measuring instruments, control valves and similar equipment installed in hazardous areas. It heats the device by heat conduction. This is the easiest, safest and most economical method of freeze protection or temperature maintainance. 2 Special Features &Advantages ?? Energy saving ?? Self limiting, no fusable link or limiter ?? Requires very little space ?? Adjusts automatically to the voltage 3 Description BLOCKTHERM is a metal heating block. The PTC cartridge provides the heat that is transferred through the heater block to the device to which it is attached. Explosion-proof types of heaters are equipped with a ground terminal and a different nameplate. 4 Performance A conduction heater requires considerably less power than a finned convection heater, as the heat conducting qualities of metal are much better than those of air. The air surrounding the whole installation in the enclosure serves as additional insulation. The diagramme below shows the heating power at different block temperatures. 0204060801001200 20 40 60 80 100Block temperature [°C]Heating power [W]DKA T3, NKA B80DKA T4, NKA B50 Ordering example of the explosion-proof models: SL BLOCKTHERM DLA T4 TS AM Ordering example to NEC Standard (CSA ...): SL BLOCKTHERM CLA T4 AM Ordering example of the non-explosion-proof models: SL BLOCKTHERM NKA B50 3M 5 Technical Data Explosion-proof Models DKA T4 DLA T4 DKA T3 DLA T3Length of Block (see 10) 90mm 105mm 90mm 105mmTemp. Class T4 T3 Type of Protection (Gas) II 2 G Ex d IIC T4 bzw.T3 Type of Protection (Dust) II 2 D Ex tD A21 IP65 T135°C,T200°C EC Examination Certificate PTB 02 ATEX 1116 X IEC Scheme Certificate IECEx PTB 07.0055X Nominal Voltage 110 to 265 V Nominal Power 50 W 80 W Operating Temp. Range -50° to +180°C Ingress Protection IP 68, NEMA 4X Material seawater-proof aluminium, black anodized All Intertec explosion-proof heaters can also be supplied to American NEC standard (CSA/NRTL/FM/UL). Non Explosion-proof Models NKA B50 NLA B50 NKA B80 NLA B80 Length of Block (see 10) 90mm 105mm 90mm 105mmNominal Voltage 110 to 265 V Nominal Power 50W 80W Ambient temp. range 200°C Ingress Protection IP 68 6 Options TS (Gas) (Dust) Room temp. controller for freeze protection II 2 G Ex dm IIC T4 bzw. T3 II 2 D Ex tDmD A21 IP65 T135°C, T200° C S Material: stainless steel, 1.4571 AM Failure alarm opens at < 5°C (only possible with version “L”, Length of Block 105mm) 3M Connection cable 3 m long Test voltage, 230V INTERTEC-Hess GmbH · Raffineriestraße 8 · D-93333 Neustadt/Donau · Tel: +49 (0) 9445/95 32-0 · Fax: +49 (0)9445/95 32 32www.intertec.infoSL BLOCKTHERM Self-limiting Block Heater HD660-5e-SL BLOCKTHERM page 2 / 2 7 Temperature Limitation PTC-elements (Positive Temperature Coefficient) raise their electric resistance with rising temperature. High resistance means low heating power. The heating power gets very low at high temperatures so that the temperature cannot exceed the maximum temperature of the respective temperature class. The PTB Certificate of Conformity stipulates that the heat transfer coefficient of the surrounding enclosure must not be less than K=0,5 W/K. All INTERTEC enclosures meet these requirements. 8 Supply Voltage In addition to the above-mentioned temperature characteristics, the PTC-elements show a varistor effect. They control their resistance in accordance to the supply voltage. The nominal power supply voltage may be 110 V to 265 V with the same heater.The output may be a maximum of 15% higher than that shown in the diagramme overleaf. 9 Electric Wiring 9.1 BLOCKTHERM with TS HeaterL1YE/GNJunction BoxNPEBU=blue BN=brown YE/GN=yellow/green BK=black GY=greyBUBNi.e. connection toother alarmers???>Option: AMBK GYTSPA? 9.2 BLOCKTHERM with TAE TAE see data sheet HD223-xe HeaterL1JunctionBoxNPEBU=blue BN=brown YE/GN=yellow/green BK=black GY=greyBUBNi.e. connection toother alarmers???>Option: AMBK GYTAEPABN BU GN/YEPA? Connection cable Silflex-EWKF 3x1,5 mm2, 1m long. Other lengths available upon request (at an extra charge). 10 Dimensions SL BLOCKTHERM DKA T... SL BLOCKTHERM DLA T... 11 Mounting The block heater dissipates the heat by conduction. It should be mounted to a flat surface of a heat conducting material (e.g. metal). One bolt is sufficient to mount the heater. Example: The SL BLOCKTHERM DKA T4, which is attached to Fisher Rosemount 3051H Transmitter by means of an adapter block, guarantees freeze protection for the transmitter, manifold and impulse lines installed in an INTERTEC Instrument Enclosure at outside temperature as low as -25°C, SL BLOCKTHERM DKA T3 even down to -45°C.