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Status Messages 37 6. Scope of Delivery, Accessories and Spare Parts 38 6.3 Scope of Delivery 38 6.4 Accessories, Spare Parts see enclosure 7. Technical Data 38 Compur Ex plus Certificate 39 -24 Compur Ex plus 1. Application The Compur Ex plus is a handy lightweight gasdetector for the measurement of combustibles in ambient air. Standard measuring range is 0 bis 100 % LEL. The instrument is powered by rechargeable batteries. Since the Compur Ex plus has been designed for use in ambient air, it may not be used in an environment with low oxygen concentrations. Compur Ex plus comes pre-calibrated to the gas to be monitored. Standard components are: Methane, Natural gas, Hydrogene, Propane, Butane, Pentane, Nonane, Methanol und Xylene. The sensor is a plug-in type and can be easily exchanged. The alarm thresholds are user adjustable. Zero- and span-adjustment are easily performed. Especially for the detection of Methane and Hydrogene an additional charcoal filter is available. This filter will remove substances which might potentially poison the catalytic bead. 2. Measuring Principle The sensor used in the Compur Ex plus gasdetector is a catalytic bead sensor (pellistor). With this type of element, combustibles between 0 and 100 % LEL can be monitored. A detector element and a compensation element are mounted in a capsulated body, sealed with metal sinter. The gas to be detected diffuses through the sinter to the detector element consisting of a heated coil coated with catalytic material. Illustration of measuring principle -25 In order to compensate for environmental influences like temperature, humidity, wind etc. a second coil without catalytic coating is used as an inactive compensation element. Both elements are electrically connected in a Wheatstone bridge. If a combustible gas diffuses to the detector element, it is oxydized by the catalytic material. Since oxygen is required for the combustion, the sensor can only be used in ambient air. The heat of the combustion produces an increase in temperature which results in a change of the internal resistance of the detector element. This change is proportional to the concentration of combustible gas and produces a misalignment of the Wheatstone bridge which after amplification is shown on a LCD display in % LEL. -26 3. The Compur Ex plus in Operating Mode The Compur Ex plus is available with a standard battery (NiMH, operation time 4 h at 20°C) or a longterm battery (NiCd, min. operation time 15 h at 20°C). When leaving the factory, the batteries are fully charged. 3.1 Charging the Compur Ex plus Both batteries (standard or longterm) can be charged in the same charging station. Charging stations are available with 1 or 4 slots. ? Switch off your Compur Ex plus when charging or charge the batteries seperately. ?Do not charge your Compur Ex plus in hazardous areas. ?Compur Ex plus detectors may be charged only in charging stations from COMPUR Monitors. ? If your Compur Ex plus detector is not in use, store it in the charging station. Charging the batteries: ??Make sure, the switch is in the OFF- position ??Connect the charging station to the mains adapter or the optional 12 V car adapter. Do not charge the batteries in hazardous areas ! -27 ??Charging station is ready. ? red LED flashes in 5 sec rythm ??Insert Compur Ex plus to the charging slot. ??Normal charging ? red LED is on continuously, green LED is off. If the detector is not inserted correctly, red LED will flash. ??If battery is approx. 60 % full, both red and green LED’s are on continously up to 100 % charge. ??If batteries are completely empty, the charging time is approx. 4 hours for the standard battery and approx. 14 hours for the longterm battery. ? When fully charged, green LED is continuously on, red LED is off. The charging station will automatically switch to conservation mode to avoid overcharging the battery. The 4-slot charger has one fast charging slot for the longterm battery. This reduces the charging time by half. Overcharging the batteries is not possible. 3.1 Battery Exchange The batteries of the Compur Ex plus can be easily exchanged, thus allowing continuous operation of the instrument. Do not shorten battery contacts ! Inserting the battery ??Make sure the detector is switched off. ??Insert the battery into the detector until the latches snap. Removing the battery ??Make sure the detector is switched off. ??On both sides of the detector you will find dots marked with “Press”. When pressing these points, battery can be pulled out of the instrument. Methan %UEG/LEL ON TEST OFF Fct Cal Ex plus The batteries may be exchanged in hazardous areas ! -28 3.2 How to Use the Compur Ex plus After switching on the Compur Ex plus detector, the instrument will show for approx. 20 seconds the software version (i.e. –1.1-) on the display. During this time the sensor will reach its working temperature. 3.3.1 Selftest When switching the Compur Ex plus into the “TEST”-position, it will perform an aut...