AMPTEC 620UK Explosive and Volatile Environment Safety Ohmmeter/Igniter Tester

NSN 6625-99-833-7949

The 620UK Low Resistance Explosive Safety Ohmmeter/Igniter Tester is a portable Intrinsically Safe Explosive Safety Digital Ohmmeter.  It was specifically designed (and UK Ministry of Defense EEX Approved) to replace the Fairey Mk7 ohmmeter for ultra-safe resistance testing around fueling depots (flammable vapours present), Aircraft bonds/connections, refineries and explosive devices (i.e. squibs, igniters, flares, detonators, munitions, warheads) in volatile and explosive atmospheres.  The AMPTEC 620UK Ohmmeter complies with the EU ATEX Directive and is Intrinsic Safety Standard (Eex-ib-IIc-T4) compliant and certified under the ATEX Laboratory Certificate # SIRA03ATEX2076.  The 620UK is Intrinsically Safe certified and can be safely used and "located where flammable gases and vapours of groups IIA, IIB, and IIC are present".  The 620UK Ohmmeter is only certified for use in ambient temperatures in the range of -20°C and +40°C and should not be used outside this temparature range. The AMPTEC 620UK Safety Ohmmeter is also: EMC tested in accordance with British Defence Standard 59-41 and British Defence Standards 66-31, 07-85 and 05-34 (-40° Cold temperature, Damp Heat +°70C, Humidity and Altitude tests) compliant.  The 620UK Ohmmeter provides a reliable and safe means of measuring resistance in explosive and volatile atmospheres

Intrinsically Safe Ohmmeter - EeX-ib-IIC-T4 British Defense Standard Compliant

The 620UK circuitry has been independently laboratory certified as EEx "Intrinsically Safe" more than just safe in the unlikely event of a worst case component failure.  The AMPTEC 620UK Explosive Safety Ohmmeter output current limiting is still in effect, regardless of component failure by total design insite and compliance to the International Safety Standard of EeX-ib-IIC-T4.

MIL STD 810, Method 511, rev F "Explosive and Volatile Atmosphere" Laboratory Tested

The AMPTEC 620UK Explosive Safety Ohmmeter has been independently laboratory certified as MIL STD 810, Method 511 (revision F) Explosive and Volatile Atmosphere compliant up to +50°C. The AMPTEC 620UK Safety Ohmmeter was remotely operated in an explosive atmospheric chamber ( Air fuel mixed with highly volatile hexane ). While fully operational, the AMPTEC 620UK  test lead contacts were successfully shorted then and disconnected 400 times in the explosive atmospheric fuel air mixture and shown to be fully compliant @ +50°C. A copy of the test report is available ( 620UK MIL STD 810_511 test ) .

U.S. NAVY Ordnance Safety Board ( Indianhead MD) Approved -  For use on Evolved Sea Sparrow Missile Squibs (ESSM )

The AMPTEC 620UK Explosive Safety Ohmmeter has also been US NAVY Ordnance Safety Board Approved for use on Evolved Sea Sparrow ( ESSM) Missile squibs - including rocket motor and warhead missile squibs. A copy of the US NAVY Ordnance Safety Board Approval is available for your review. ( AMPTEC 620UK - ESSM APPROVAL )

Low Ohm Range - Accuracy and Resolution

A common question is "What does AMPTEC offer to improve the measurement accuracy and resolution with a low resistance value squib/detonator measurement/application?".  Hence the development of the AMPTEC 620UK Explosive Safety Igniter Tester.  The 620UK offers the following fullscale ranges - 2.0 Ohm, 20 Ohm, 200 Ohm and 20 Kohm, 200K Ohm and 2.0M Ohm.  The 2.0 Ohm fullscale range provides a two-wire Kelvin resistance measurement from 0.0000 ohms to 1.9999 ohms. The 2.0 Ohm range also offers a low (1/10) 0.1 milliohm or 100 microhm resolution.  The 2.0M ohm range provides a relatively high resistance range for determining electrical "isolation" status or open circuit (>2.0M Ohms) character of ordnance related control lines, pins , sockets, and wiring.

The AMPTEC 620UK Intrinsically Safe Ohmmeter comes with  a precision ten turn front panel knob adjust capability. This allows the AMPTEC 620UK Safety Ohmmeter user to fine tune most any in series "Contact or Test Lead Resistance Offsets and Errors.

Better and Safer than a Multifunction DMM

Multifunction DMMs have many modes (i.e DC Voltage, AC Voltage, DC current, AC current, frequency, shift keys, Capacitance and more..) that can accidentally mis-measure igniter circuit resistance.  If the DMM has an electrical fault, the igniter circuit may accidentally fire.  The 620UK Igniter Tester only measures resistance, it is not a complex multifunction DMM.  If the 620UK had an electrical fault it offers the life saving advantage of failing safe.

No Hazardous Mercury Batteries

The 620UK does not use hazardous mercury batteries like those used in the older model igniter testers.  All 620UK Igniter Testers are powered by 4 AA Alkaline batteries that have been officially approved as EEX battery type compliant.  The AMPTEC 620UK Ohmmeter may be used with the Duracell MN1500 mfg. of AA batteries as well as several other approved brands.

Polyurethane Epoxy Encapsulated Coated Circuit Board and More ...

A common question we get from evaluating safety engineers is "What sort of electrical and  mechanical  measures are taken with the AMPTEC 620UK to prevent an internal  loose wire, metal screw, or washer inside from floating around and shorting the battery output to the terminal output connections?".  The ohmmeter's output connections are insulated inside the unit with heat shrink tubing covering any of it's conductive surfaces.  The entire PCB (except for the calibration trim pots) is also non-conductice polyurethane epoxy encapsulated/coated, to make it extremely difficult to get an accidental conductive pathway.