Intrinsically safe true RMS Digital Multimeter from KUSAM MECO

KUSAM-MECO, the measurement instruments specialist in India, has introduced for first the time a new intrinsically safe True RMS Digital Multimeter with PC Interface Model KM 822sEX. It has a four digit 10,000 counts large easy to read, backlight dual display.

EX marking on meter i.e. Ex ib I Mb, Ex ib IIC Gb, SAEx MS/09-291X, Ex ib falls under Zone 1 which is an area where flammable gas can occur in normal operating conditions. It has high transient protection of 12 KV (1.2/50mS) lightning surge.

Measuring functions

DC/AC Voltage: 60mV ~ 1000V; DC/AC Current: 600micro A ~ 10A; Resistance: 0.1Ohm ~ 60MOhms; Frequency: 5Hz ~ 1MHz Capacitance: 60nF ~ 20mF. It also has Diode, Continuity, and Duty Cycle Function.

In addition it features Splash/Drop Proof, Intrinsically Safe, Beep-Jack Audible & Visible Input Warning, Relative Zero Mode, Data Hold, Ex rating-Ex ib I/IIC T6. It has (optional) PC interface for downloading the data in computer via USB cable & Software.

These meters comply with IEC SANS 600790:2000 & IEC SANS 60079-11:1999, which is for Electrical apparatus for explosive gas atmospheres. Part 0 (general requirements) & part 1 (intrinsic). The approved explosive protection rating of this equipment is suitable for use in Zone1 hazardous area. Group I (coal mines) underground & Group II (surface).


It has double insulation per IEC61010-1 2nd Ed., EN61010-1 2nd Ed., UL61010-1 2nd Ed. & CAN/CSA C22.2 No. 61010.1-0.92 to Category IV 1000Vac & Vdc. For Voltage, Ampere, Milli Ampere & Micro Ampere ranges, the safety category is IV1000Vac & Vdc. It has Fuse protection for micro Ampere & milliAmpere 0.44A/1000Vac &Vdc, IR10kA or better, F Fuse. For Ampere ranges, the fuse protection is 11A/1000Vac & Vdc, IR20kA or better, F Fuse. For Voltage range, fuse protection is 1050Vrms, 1450Vpeak. Milli Volts, Ohms & others fuse protection is 600Vdc & Vac rms.

It features a rugged fire-retardant casing, protective holster with probe holder & tilt stand.

It is powered by one 9V battery no. NEDA 1604G, IEC6F22.


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