Nittan NHD-G series Instruction Manual
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Ref No:DATE:PAGE: ISSUE:NISM/NHD/03NHD-G SERIESHEAT DETECTORINSTRUCTION MANUALMARCH 20011 5OF 03CONTENTSSection 1 - Introduction - Page 1Section 2 - Operation - Page 1Section 3 - Detector Models - Page 2Section 4 - Base Models - Page 2Section 5 - Installation - Page 2Section 6 - Wiring - Page 2Section 7 - Maintenance &Cleaning - Page 3Section 8 - Specification - Page 4SECTION 9 - EMC - Page 4Section 10 - DIMENSIONS - Page 4Section 11 - Accessories - Page 5Section 12 - ResponseCharacteristics - Page 5SECTION 1 - INTRODUCTIONThe NHD-G range of attractively styled, fast re-sponse, low profile heat detectors.They have been designed, in most cases, to replaceour 2SA-70T-LS, TCA-70-LS AND TCA-60-LSFeatures:* Low profile, stylish appearance* Four different response grades* Non-polarised terminals* Head removal signal facility* Low monitoring current* Integral LED alarm indicator* Remote indicator output* Easy maintenanceSECTION 2 - OPERATIONThe NHD-G range of heat detectors are non mechani-cal and use a thermistor of low thermal mass as thesensing element giving a fast response. Althoughthese detectors operate on a fixed temperaturethreshold only, their fast response makes themgenerally suitable for use where rate-of-rise detectorswould be used.Fig. 1. Block Diagram of NHD-G Detector CircuitRECTIFIERANDFILTEROPERATIONINDICATORSWITCHINGUNITVOLTAGESTABILISERP+LCICIISENSINGTHERMISTORINTERNALREFER-ENCECOMPARITORUNITFIG. 1 |
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