‘Kusam-Meco’, pioneers of digital multimeters & clampmeters in India have introduced for first time a new intrinsically safe true RMS Digital Multimeter with PC interface model KM 822sEX. It has high transient protection of 12 KV (1.2/50mS) lightning surge. 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.
The measuring functions include:
DC/AC Voltage: 60mV ~ 1000V;
DC/AC Current: 600micro A ~ 10A;
Resistance: 0.1 Ohm ~ 60MOhms;
Frequency: 5Hz ~ 1MHz
Capacitance: 60nF ~ 20mF. It also has diode, continuity, 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 to 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).
Safety: 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 IV1000 Vac & Vdc. It has fuse protection for micro Ampere & milli Ampere 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. Standard accessories supplied are user manual, battery, test lead & carrying case. PC software is optional.