ST420-LT/ST420-DI FM Approval
Contents
1. 3 3 4 3 3 5 3 3 6 3 3 7 3 3 8 3 3 9 FM APPROVALS Project ID 3043444 manual and is an integral part of the housing Refer to Sections 4 1 4 and 4 1 5 for protective ground connection depictions This is satisfactory Dielectric Tests A test potential of 500 Vac was applied for 1 minute between the input supply terminals of test sample 2 tied together and the protective ground terminal outer sensor case with no occurrence of breakdown This is satisfactory Field Wiring The ST420 LT and ST420 DI sensors come complete with a NRTL listed 10 foot length of shielded 2 x 24 AWG stranded copper wire rated for 105 C for electrical connection using a suitable Class H I wiring method to a suitably rated junction box No consideration was needed in regards to vibration as the lead wires conductor size was not smaller than 24 AWG This is satisfactory Protection Against Mechanical Hazards The ST420 LT and ST420 DI sensors do not have any moving parts provisions for carrying or lifting provision for wall mounting parts which are likely to become expelled in the event of a fault It is considered fixed equipment As a result no further evaluation is needed for protection against mechanical hazardous This is satisfactory Mechanical Resistance to Shock Impact and Resistance to UV radiation Rigidity shock and impact testing was waived as the ST420 LT and ST420 DI sensors is made from solid metallic fabricated material as d2. Dust Blanketing Temperature Test Surface temperature tests were waived on the ST420 LT and ST420 DI sensors as the maximum power dissipated by the device is less than 1 watt The power dissipation would not produce a temperature rise greater than 20 C in the rated 80 C ambient This qualifies the manufacturer s request for a temperature code of T5 at a 80 C maximum ambient temperature rating This is satisfactory Protection Against Electrical Shock Fire and Injury Electrical utilization equipment acceptability is based on the ability of the equipment to minimize the risk of electrical shock injury and fire The following verifies that the ST420 LT and ST420 DI sensors were found to meet these requirements for US and Canada Protection from Electric Shock The maximum normal operating parameters of the ST420 LT and ST420 DI sensors for use in outdoor wet locations are specified to be less than 16Vrms 22 6 V peak 35 Vdc As for Canada the circuit voltage does not have a voltage more than 30Vrms or 42 4V peak and is classified as an Extra low Voltage Class 2 circuit Therefore the equipment is not considered to be Hazardous Live for the USA and as for Canada pose a Shock Hazard Protective Ground The ST420 LT and ST420 DI sensors contains an external protective ground terminal connection This external ground terminal connection 1s installed pursuant to the user s Page 4 of 11 3 3 1 2 3 3 1 3 3 3 2 3 3 3
3. external cleaning and spillage of liquids will not present a hazard This is satisfactory Process Pressure Test The ST420 LT and ST420 DI sensors are not intended to be used in a process which contains liquids The process pressure test is not applicable This is satisfactory Protection against Radiation Laser Sources and Against Sonic and Ultrasonic Pressure The ST420 LT and ST420 DI sensors is not a source for producing radiation laser emissions sonic or ultrasonic pressure As a result no further evaluation is needed This is satisfactory Protection Against Liberated Gases Explosion and Implosion The ST420 LT and ST420 DI sensors do not contain gases batteries or high vacuum devices As a result no further evaluation is Page 5 of 11 3 3 10 3 3 11 3 4 3 4 1 3 4 2 3 4 3 3 4 4 3 5 3 5 1 3 5 2 FM APPROVALS Project ID 3043444 needed for protection against Liberated Gases Explosion and Implosion This is satisfactory Components The ST420 LT and ST420 DI sensors do not have any components such as motors over temperature protection devices fuse holders accessible to the operator transformers etc which are required to be examined for electric shock fire and injury The PCB shaft tachometer board is specified as FR4 laminate Green Glass Epoxy with a 94V 0 flammability rating or better This 1s satisfactory Protection by Interlocks The ST420 LT and ST420 DI sensors do not contain any
4. Electrical Equipment for use in Hazardous Classified FM Class 3600 1998 Locations General Requirements Electrical Equipment for Measurement Control and FM Class 3810 2005 Laboratory Use Degrees of Protection Provided by Enclosure IP Code ANSI TEC60529 2004 Enclosures for Electrical Equipment 1000 Volts Maximum ANSI NEMA 250 2003 The equipment described in this report was shown to comply with the applicable requirements of the following standards for use in Canada Bonding of Electrical Equipment CSA C22 2 No 2004 0 4 Threaded Conduit Entries CSA C22 2 No 1982 0 5 R2003 Enclosures for use in Class If Groups E F and G Hazardous CSA C22 2 No 25 1966 Locations R2004 Special Purpose Enclosures Industrial Products A National CSA C22 2 No 94 1991 Standard of Canada Industrial Products Forming Part of Canadian Electrical CSA 1987 Code Part II Safety Standards for Electrical Equipment C22 2 No 142 R2004 Degrees of protection provided by enclosures IP Code CSA C22 2 No 2005 60529 Listing The equipment described in this report will appear in the Approval Guide an online resource of FM Approvals as follows Page 2 of 11 1 5 1 1 5 2 1 6 i 2 1 2 2 FM APPROVALS Project ID 3043444 United States Listing ST420 LT a Tachometer Sensor DIP IL UI 1 2 EFG T5 Ta 80 C Type 4X IP65 a Frequency Range L H or C X XXX C XXXX is customer requested frequency range with 4 digit trac
5. flying cable wire pre installed within the liquid tight conduit for electrical connection Test sample 2 ST420 DI Tachometer sensor with 10 foot length of 2x24AWG shielded stranded flying cable wire The body of the sensor incorporates a 2 inch female NPT trade size conduit connection Three wraps of Teflon tape was used on the conduit used prior to the environmental protection tests Dust Ignitionproof Tests The following tests verified the suitability of the ST420 LT and ST420 DI sensors as suitable for Class II and III Division 1 and 2 Groups E F and G for hazardous locations for use in US and Canada Impact Tests Test samples 1 and 2 were subjected to impacts from a 25 mm spherical steel tip at a 7 Joule magnitude The impact was obtained by dropping a 1 0 kg weight from a height of 0 7 m onto various test points on the test samples Results were satisfactory in that no damage occurred to the test samples that would invalidate the Type of Protection Dust Exclusion Test Test Samples 1 and 2 were individually suspended in a circulating dust atmosphere of 200 mesh talc The test sample was connected to a vacuum pump adjusted to draw a vacuum of 20 mBar on the sample The test lasted a total of eight hours and at the conclusion of the test the test sample was removed from the test chamber excess dust was removed from the surface and opened Results are satisfactory as the sensors were found to have excluded the entry of dust
6. to follow up audit inspections MANUFACTURER S RESPONSIBILITIES The manufacturer shall advise FM Approvals of all proposed changes to the documentation listed in Section VIII of this report through FM Approvals Form 797 Approved Product Revision Report No Page 9 of 11 FM APPROVALS Project ID 3043444 changes of any nature shall be made unless notice of the proposed change has been submitted and written authorization obtained from FM Approvals 7 2 On 100 of production the manufacturer shall inspect the protective grounding system Vill DOCUMENTATION The following drawings depict the design of the products identified in Section 1 5 and are on file at FM Approvals blueprint file 3043444 Level 213 000030 213 012920 213 012921 Label ST420 DI FM Reference 213 012922 Label ST420 DI FM Shipping Box 213 012930 Label ST420 LT Cable 213 012931 Label ST420 LT FM Reference 213 012932 Label ST420 LT FM Shipping Box 300 004601 Gland T amp B 5332 Style 316SS 305 006402 Housing Sensor Closed M18x1 SS 1 2 Flex Housing Sensor Closed M18x1 SS 1 2 NPT A A A A A A A 305 006403 A 698 059400 A 750 001 100 750 001 100 BOM 800 001900 BOM 800 0019XX 800 004100 BOM 800 0041 XX 990 003901 Schematic PCB ST420 ASSY PCB ST420 ASSY PCB ST420 ST420 DI L 2 200 RPM 8 PPR ST420 DI Final Assembly ST420 LT L 2 200 RPM 8 PPR ST420 LT Final Assembly ST420 DI 4 20mA Shaft Tach
7. FM Approvals of the NOT to be distributed outside of FM Approvals and its affiliates except by CUSTOMER APPROVAL REPORT ST420 LT AND ST420 DI SHAFT TACHOMETER SENSORS FOR USE IN HAZARDOUS LOCATIONS Prepared for Electro Sensors Inc 6111 Blue Circle Dr Minnetonka MN 55343 USA ProjectID 3043444 Class 3616 FMCU Date of Approval 26 January 2012 Authorized by a 4 Manuo E Marquedant Group Manager Electrical FM Approvals 1151 Boston Providence Turnpike PO Box 9102 Norwood MA 02062 Page 1 of 11 1 2 1 3 1 4 1 5 FM APPROVALS Project ID 3043444 INTRODUCTION Electro Sensors Inc manufacturer requested FM Approval of their ST420 LT and ST420 DI Tachometer Sensors listed in Section 1 5 to be in compliance with the applicable requirements of the standards listed in Section 1 3 and 1 4 For FM Approval for use in the United States as Dust ignitionproof for Class MII Division 1 and 2 Groups E F and G hazardous classified locations indoors and outdoors Type 4X IP65 For FM Approval for use in Canada as suitable for use in Class I Division 1 and 2 Groups E F and G and Class III Division 1 hazardous locations indoors and outdoors Type 4X IP65 This report may be freely reproduced only in its entirety and without modification The equipment described in this report was shown to comply with the applicable requirements of the following standards for use in the United States
8. This is satisfactory External Icing Test This test was waived as the ST420 LT and ST420 DI sensors do not contain areas that could accumulate ice and have no external operators that could be damaged by ice This is satisfactory Ingress Protection Rating Tests The following tests verified the IP65 rating for the ST420 LT and ST420 DI sensors Dust Exclusion Test IP6X This testing was satisfactorily carried out as described in Section 3 2 2 This is satisfactory Hosedown Test IP X5 Test samples 1 and 2 were subjected to a stream of water from a hose with a 14 inch 6 3 mm diameter nozzle delivering 3 3 gallons 12 5 1 per minute The stream of water was applied on all joints for a period of at least 3 minutes from a distance of 8 2 to 9 8 feet 2 5 to 3 m for three minutes At the conclusion of the test the sample was opened and was found to have excluded the entry of water This is satisfactory Page 6 of 11 IV 4 1 FM APPROVALS Project ID 3043444 MARKING The ST420 DI and ST420 LT Sensors certification markings and labels are found in the manufacturer s users manual and as labeled on the shipping box since the equipment was determined to have insufficient space for certification marking and product ratings A certification reference label is also applied by the user after installation onto the product as indicated in the user s manual Below in the following Sections are depictions of the marking method
9. escribed in Section II of this report There are no parts likely to crack or loosen which will cause a hazard such as electric shock fire moving parts damaging of barriers or invalidated creepage distances As a result no further evaluation is needed for protection against shock and impact This is satisfactory Protection Against the Spread of Fire The PCB shaft tachometer board has a 94V 0 flammability rating and the electronics and connection facilities of the ST420 LT and ST420 DI sensors are enclosed in a metallic housing This design construction and the lower power dissipation determined satisfactory compliance against internal spread of fire This is satisfactory Equipment Temperature Limits and Resistance to Heat The ST420 LT and ST420 DI sensors are considered to be industrial measurement equipment There are no parts which need to be touched for functionality reasons The maximum temperature of the field wiring within the enclosure was determined to be approximately the maximum ambient 80 C due to the low power of the equipment The equipment is suitably factory wired with conductors rated to 105 C 300V This is satisfactory Protection against Hazards from Fluids The ST420 LT and ST420 DI sensors were examined to determine if the process of cleaning and the spillage of liquids could result in a hazard The ST420 LT and ST420 DI sensors are not supplied with hazardous live voltages and has a water tight enclosure As a result
10. king no ST420 DI a Tachometer Sensor DIP IL WI 1 2 EFG T5 Ta 80 C Type 4X IP65 a Frequency Range L H or C X XXX C XXXX is customer requested frequency range with 4 digit tracking no Canada Listing ST420 LT a Tachometer Sensor DIP IL WI 1 2 EFG TS5 Ta 80 C Type 4X IP65 a Frequency Range L H or C X XXX C XXXX is customer requested frequency range with 4 digit tracking no ST420 DI a Tachometer Sensor DIP IL WI 1 2 EFG T5 Ta 80 C Type 4X IP65 a Frequency Range L H or C X XXX C XXXX is customer requested frequency range with 4 digit tracking no As described in this report the construction of the ST420 LT and ST420 DI Tachometer Sensors provide for the degree of protection against electrical shock fire and injury required for hazardous locations DESCRIPTION The ST420 LT and ST420 DI sensors are tachometer sensors used for measuring the speed of a shaft The sensors detect magnetic pulses from a rotating shaft which has magnetic pulser targets mounted on the shaft disc type or wrap type The output from the transmitters is a continuous 4 20 mA analog signal in direct proportion to the pulse frequency rotating shaft speed The ST420 LT and ST420 DI sensors are available in three different frequency range options low option L for 0 2667 to 26 67 Hz high option H for 0 2667 to 266 7 Hz or customer option C supplied The ST420 LT and ST420 DI sensors are packaged within a M18x1 stainle
11. ometer Sensor Transmitter USERS MANUAL 990 003902 A ST420 LT 4 20mA Shaft Tachometer Sensor Transmitter USERS MANUAL IX CONCLUSION 3 JA 535 052300 D PCB Shaft Tach 4 20 The equipment identified in Section 1 5 of this report meets FM Approvals requirements Since a duly signed Master Agreement is on file for this manufacturer FM Approval is effective the date of this report Page 10 of 11 TESTING BY C Burch EXAMINATION BY C Burch PROJECT DATA RECORD 3043444 ATTACHMENTS None REPORT BY Christopher Burch Senior Engineer Hazardous Locations FM APPROVALS Project ID 3043444 Page 11 of 11 REPORT REVIEWED BY Andrew Lozinski Technical Team Manager Hazardous Locations
12. protection by interlocks therefore no further examination was needed This is satisfactory Environmental Tests The following tests verified the Type 4X environmental rating for the ST420 LT and ST420 DI sensors Pre Conditioning As the ST420 LT sensors employ resilient non metallic gaskets o ring seals which provide protection against the ingress of water and dust the complete enclosure with such gaskets seals in place was subjected to the following preconditioning Test sample 1 was subjected to 90 relative humidity at a temperature of 20 2 K above the maximum service temperature 1 e 95 C for 168 hours Hosedown Test A pre conditioned test sample 1 as described in Section 3 4 1 and test sample 2 were subjected to a stream of water from a hose with a 1 inch 25 4 mm diameter nozzle delivering 65 gallons 246 1 per minute The water was directed at all points of potential water entry such as seams joints external operating mechanisms and such The nozzle was moved along each test point at a uniform nominal rate of 6 mm sec 1 4 in sec at the sample from all sides from a distance of 10 to 12 feet 3 to 3 7 m for a minimum of 5 minutes At the conclusion of the test the enclosure sample was opened and was found to have excluded the entry of water This is satisfactory Corrosion Test This testing was waived as the materials used for the construction of the ST420 LT and ST420 DI sensors are stainless steel type
13. s used for the ST420 LT and ST420 DI Sensors ST420 DI and ST420 LT Sensors Shipping Box Labels 7T420 D1 Class Il and Ill Div 1 es e i and G T5 Ta 80 C closure Ty Refer to hh A AE for Insta ah 1 375 ELECTRO SENSORS t i E APPROVED 6111 Blue Gir Dr Minnetonka MN 55343 USA 7420 LT Class Il and Ill Div 1 and 2 Group E F and G T5 Ta 80 C IP s idosure T Refer to Users Manual 990 003902 for Installati 1 375 ELECTRO SENSORS t APPROVED 6111 Blue Cir Dr Minnetonka MN 55343 USA 4 1 2 ST420 DI User s Manual 990 003901 markings Approvals Dust Ignition proof for use in Class If and II Div 1 and 2 Groups E F G when installed Ratings with a Class II Div rated fitting and conduit See Installation p 2 T5 Ta lt 80 C IP65 Enclosure Type 4X M C US ELECTRO SENSORS APPROVED 6111 Blue Cir Dr Minnetonka MN 55343 Page 7 of 11 FM APPROVALS Project ID 3043444 4 1 3 ST420 LT User s Manual 990 00902 markings Approvals Dust Ignition proot for use in Class I and II Div and 2 Groups E F G Ratings when installed using Class II rated 1 in flexible liquid tight conduit T5 Ta 80 C IP65 Enclosure Type 4X M ELECTRO SENSORS L US APPROVED 6111 Blue Cir Dr Minnetonka MN 55343 4 1 4 ST420 LT user applied Certification Reference label as depicted in User s Manual 990 00902 as applied by installer after installation 1 2 Fle
14. ss steel sensor housing with either a 1 2 inch NPT female conduit thread type ST420 DI version for 1 2 inch trade size conduit connection or with a flexible liquid tight fitting for connection with 2 inch liquid tight flexible conduit ST420 LT version The ST420 LT and ST420 DI sensors are rated for 8 to 30 Vdc and shall be powered by a Class II power supply The ST420 LT and ST420 DI sensors come complete with a NRTL listed 10 foot length of shielded 2 x 24 AWG stranded copper wire rated for 105 C for electrical connection using a suitable Class I II wiring method to a suitably rated junction box The ambient temperature range of the ST420 LT and ST420 DI sensors are rated for use from 20 C to 80 C Page 3 of 11 HI 3 1 3 2 3 2 1 3 2 2 3 2 3 3 3 3 3 1 3 3 1 1 FM APPROVALS Project ID 3043444 EXAMINATIONS AND TESTS The following test samples considered to be representative of the ST420 LT and ST420 DI sensors were examined tested and compared to the manufacturer s drawings All testing was conducted at FM Approvals facilities in West Glocester Rhode Island USA All test data is on file at FM Approvals under Project ID 3043444 along with other documents and correspondence applicable to this program Test sample 1 ST420 LT Tachometer sensor with 10 foot length of inch trade size flexible liquid tight conduit attached The test sample also include a 10 foot length of 2x24A WG shielded stranded
15. xible Liquid tight Conduit Certification Reference Label AN A ELECTRO SENSORS APPROVED gt Model 1420 LT XXXXXX Job JXXXXXX YY For NATL certification and product ratings refer to Users Manual p n 990 003902 4 1 5 ST420 DI user applied Certification Reference label as depicted in User s Manual 990 00901 as applied by installer after installation Page 8 of 11 5 1 5 2 5 3 VI Vil 7 1 FM APPROVALS Project ID 3043444 Certification Reference Label lt M eere prons Model T420 DI XXXXKX Job JXXXXXX YY For NRTL certification and product ratings refer to Users Manual p n 990 003901 REMARKS Installation in the United States of America shall be in accordance with the National Electrical Code ANSI NFPA 70 and the manufacturer s instructions Installation in Canada shall be in accordance with the Canadian Electrical Code C22 1 and the manufacturer s instructions The product s described in this report were certified by FM Approvals under a Type 3 Certification System as identified in ISO Guide 67 FACILITIES AND PROCEDURES AUDIT The manufacturer s design control and manufacturing facility located in Minnetonka Minnesota 1s subject to follow up audit inspections The facility and quality control procedures in place have be found to be satisfactory to manufacture product identical to that examined and tested as described in this report These facilities are subject
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