43466_DW_Review92_S20-39 06.01.2005 15:51 Uhr Seite 28 GAS DETECTION TECHNOLOGY Dräger X-am 7000 – a multigas detector that can do more The Dräger X-am 7000 mobile multigas detector is an innovative solution for the simultaneous and continuous measurement of up to five gases. A combination of over 25 sensors allows flexible adaptation to individual measurement tasks. The Dräger X-am 7000 can be equipped with three electrochemical and two infrared-optical or catalytic sensors. In many industrial applications, the instrument is the ideal companion when it comes to reliable monitoring of ambient air for the presence of oxygen, toxic and combustible gases and vapours. 07 05 Components of the Dräger X-am 7000 Figure 1 shows the core components of the X-am 7000 01 Two sensor ports - compatible with a selection of three smart IR sensors and two smart catalytic sensors of the new generation. 02 Three electrochemical sensor ports – compatible with a selection of 20 different smart electrochemical sensors. 03 The Dräger X-am 7000's patented smart rechargeable battery guarantees an accurate display of the remaining use time. A large battery capacity means that the instrument can be used for several shifts, while the extremely long life of the rechargeable battery keeps costs of ownership low. 04 An internal sampling pump is available as an option. The pump is easy to attach, making for straightforward replacement or retrofitting. Because the instrument is water-tight, the pump is protected by Gore membranes, which means that the pump stays dry and is protected from damage even when it is pumping water. Even under extreme conditions, the pump functions reliably and safely. 02 01 06 08 04 ST-3075-2004 03 28 92 DRÄGER REVIEW 01|2005 05 The audible alarm is very loud (over 100 dB) and the visual alarm is bright and clearly visible from all directions. Together with the instrument's excellent stability, this makes it ideally suited for use in area monitoring applications. 06 The Dräger X-am 7000 is not only dust- and splash-proof, but also one hundred percent dustand water-tight as per IP67. Even the sensors are protected upon immersion in water by waterrepellent membranes. 07 The intuitive three-key operation is easy to learn, and the keys can even be operated easily by users wearing thick protective gloves. 08 The smart sensors mean that the Dräger X-am 7000 software is configured automatically when a sensor is inserted. Because all messages are output in plain text and the user is guided through the menu, even personnel with very little training can operate the instrument safely. What is more, individual software configuration and features such as the leak detection mode open up additional possible uses. 43466_DW_Review92_S20-39 06.01.2005 15:51 Uhr Seite 29 Properties and functional principles of the Dräger X-am 7000 sensors All the sensors used in the Dräger X-am 7000 are "smart" – but what exactly does that mean? ST-2636-2003 Properties of infrared sensors Infrared sensors are capable of detecting either explosive gases and vapours or CO2. The optical sensor is characterized by an extremely long service life (with a five year warranty), and adjustment intervals of up to 12 months. Infrared detectors are also resistant to sensor poisoning, and the effects of temperature, dirt or vibration are eliminated by the compensation detector. Accordingly, the sensor justifiably claims to be failproof. ST-2636-2003 The sensors feature an integrated data memory, in which various parameters such as sensor type, gas type and measurement range, temperature compensation, alarm limits and calibration data are stored. When a sensor is inserted into the instrument, no configuration is necessary because all the relevant data are automatically transmitted from the sensor to the instrument. In other words, the sensors function on a “plug and play” basis. When a service technician needs to replace a sensor or prepare the instrument for a different application, this can be done easily by simply inserting the sensor. The instrument is configured automatically and is already pre-calibrated, virtually ruling out incorrect operation. 92 DRÄGER REVIEW 01|2005 29 43466_DW_Review92_S20-39 06.01.2005 15:51 Uhr Seite 30 GAS DETECTION TECHNOLOGY DRÄGER X-AM 7000 – A MULTIGAS DETECTOR THAT CAN DO MORE Unlike the catalytic EX sensor, the infrared EX sensor can also be used to conduct measurements in low-oxygen or zero-oxygen conditions. Furthermore, methane, propane and butane gases, as well as LPGs (liquefied petroleum gases – used as fuels in the shipping industry) can be detected not only in the lower explosive limit (LEL) range, but also in the percent-by-volume range. Properties of the electrochemical sensors A whole series of different electrochemical sensors is used for the detection of various toxic gases and vapours and oxygen. Dräger's patented three-electrode technology maximizes the signal with respect to the gas being measured, and minimizes the effects of other substances. RANGE Catalytic sensors RANGE Infrared sensors IR-Ex 0 – 100 % UEG SENSORTYPE / GAS RANGE Dräger Sensors XS R CO 0 – 2000 ppm H 2S 0 – 100 ppm O2 0 – 25 Vol.-% Dräger Sensors XS EC SENSORTYPE / GAS SENSORTYPE / GAS Electrochemical sensors (EC) Kat Ex Sensor 0 – 100 % UEG Kat Ex Sensor HC 0 – 100 % UEG und 0 – 100 Vol.-% CH4 CO 0 – 2000 ppm H2S 100 0 – 100 ppm H2S HC 0 – 1000 ppm O2-LS 0 – 25 Vol.-% O2 100 0 – 100 Vol.-% NO 0 – 200 ppm 0 – 100 Vol.-% SO2 0 – 100 ppm IR-CO2 0 – 5 Vol.-% NO2 0 – 50 ppm IR-CO2 HC 0 – 100 Vol.-% COCI2 0 – 3 ppm The smart EX sensors in the X-am 7000 contain a library of different combustible gases or vapours. Whenever one of these substances is selected, the sensor sensitivity is switched automatically to the respective value of the substance in question. The Dräger X-am 7000 also features a function key which is used to switch between different gas configurations at the push of a button, making it easy and safe to adapt the instrument to different applications. Properties of catalytic sensors Catalytic sensors are used to detect combustible gases and vapours. The SmartCat sensor in the Dräger X-am 7000 is highly sensitive to atmospheres containing organic vapours. Since the instruments are often adjusted to gases which are detected with higher sensitivity, this ensures that an alarm will be reliably given even in explosive vapour atmospheres. This is a very valuable attribute, particularly in refineries or when detecting unknown hazards (e.g. by fire brigades). The poison-resistant design also minimizes the effects of sensor poisons, especially H2S. What is more, the impact-resistant sensor can withstand even a one and a half metre drop with hardly any noticeable impairment of measurement function. 30 92 DRÄGER REVIEW 01|2005 The Dräger Sensors XS R for CO, H2S and O2 come with a five year warranty. The XS sensors are designed for “extra stability”, and do not require any consumable substances. This results in a long service life and adjustment intervals of up to 12 months. Even in changing ambient conditions, the DrägerSensors perform reliable measurements. A temperature sensor integrated into the sensor compensates for any fluctuations in the ambient temperature, and the sensors are also pressure-compensated. Power supply unit The Dräger X-am 7000 can be used with a 3 Ah or 6 Ah power supply unit. It features two or four batteries, which are discharged one after another. Once each battery has been discharged, its capacity is verified. The display of the remaining available battery capacity is refreshed, and therefore remains accurate and reliable. Because the batteries are discharged in series, an up-todate picture of the battery capacity is obtained at the latest after three to four days of use, assuming shifts of >7 hours. As such, the batteries are monitored during operation, and defective cells are detected. The instrument sounds a main battery alarm and switches itself off automatically once the minimum charge Q (standby) is reached. This reserve is sufficient for roughly seven standby days without re- NH3 0 – 200 ppm HCN 0 – 50 ppm CI2 0 – 20 ppm Hydride 0 – 20 ppm CO2 0 – 5 Vol.-% OV 0 – 200 ppm OV-A 0 – 100 ppm Odorant 0 – 40 ppm PH3 HC 0 – 1000 ppm Amine 0 – 100 ppm CO HC 0 – 10.000 ppm H2 0 – 2000 ppm Dräger Sensors XS 2 CO 0 – 2000 ppm H 2S 0 – 100 ppm H2S SR 0 – 100 ppm O2 0 – 25 Vol.-% charging. During this time, the sensors remain warm, ensuring they are quickly ready for use. At the end of this time, the instrument disconnects itself from the power supply. Nonetheless, thanks to the deep discharge reserve the supply is still not fully discharged. This protects the battery and ensures a long service life. Upon recharging of the power supply unit, the only difference is that the sensors require longer warm-up times. 06.01.2005 15:51 Uhr Seite 31 ST-2756-2003 43466_DW_Review92_S20-39 The “charge intelligence” is incorporated into the rechargeable battery and means that the battery can also be charged without the Dräger X-am 7000. The charger module can be connected to the Dräger multiple charger module, a mains plug or a car charger unit. Durability and protection against climatic conditions In industrial applications, gas detection instruments are frequently exposed to knocks and harsh climatic conditions. The Dräger X-am 7000 comes as standard with a rubber protective housing which protects it if dropped up to 1.5 metres. Because the sensors are not sensitive to shock, their measurement function is not significantly impaired by impact. The Dräger X-am 7000 is also the only instrument on the market which is fully immersion-proof as per IP 67, meaning that no repairs are necessary if an instrument falls into water. In such cases, even the sensors are protected by water-repellent membranes. In addition, the optional sampling pump is protected by Gore water-tight membranes, preventing damage to the pump due to pumped water. Pump/sampling Pump operation starts automatically when the pump adapter is connected. The pump run-time is displayed by the instrument, which is very useful for confined space entry measurements, as dead-time in the sampling path and sensor response times have to be taken into account. The pump is continuously monitored by a flow sensor, which triggers an alarm in the event of a malfunction. The immersion-proof Dräger X-am 7000 can also withstand harsh ambient conditions. ST-3076-2004 The Dräger X-am 7000 is charged at a fairly high charge current, namely 1 A. This allows the power supply units to be recharged quickly. In addition, the high charge currents also prevent the formation of dendrites – ageing-related crystals which can result in battery cell damage – thus giving a longer cell life. Sampling can be conducted using a hose of up to 45 metres in length. Depending on the application in hand, a range of different sampling probes are available to perform confined space entry measurements: from a straightforward hose or floating probe, to rod probes, leak probes and various telescopic probes. 92 DRÄGER REVIEW 01|2005 31 43466_DW_Review92_S20-39 06.01.2005 15:51 Uhr Seite 32 GAS DETECTION TECHNOLOGY DRÄGER X-AM 7000 – A MULTIGAS DETECTOR THAT CAN DO MORE technician to predict whether a sensor will need replacing during the next routine service. As with the instrument's predecessor, the MultiWarn II, the EX sensor can also be vapour-calibrated. ST-3077-2004 switch between Ex-sensor calibrations (e.g. methane - nonane), leak detection mode. Leak detection mode The leak detection mode can be used in conjunction with the catalytic EX sensor calibrated to methane. The display then The optional pump can be easily replaced or retrofitted simply by attaching it to the Dräger X-am 7000. ST-3079-2004 Software Operation The intuitive three-key operation is easy to learn. Incorrect operation by the user is unlikely, as all messages appear in plain text. The keys can even be operated easily by users wearing thick protective gloves, and Functionality Users can configure a password-free quick menu to suit their particular needs, giving quick access to key functions (e.g. hygiene functions like monitoring of TLV and STEL values, info screens relating to the battery etc.). The Info mode give access to information on current warnings/errors, system data (battery status, data log, clock), sensor information such as measurement ranges, and personal and session IDs. This information can also be accessed when the instrument is switched off, which makes it easier for the service technician to prepare the instrument for use. The service technician can assign different functions to the function key. This allows the user to activate and deactivate additional functions at the push of a button, e.g. display maximum value, hold peak value, 32 92 DRÄGER REVIEW 01|2005 Data log The instrument can be equipped with an optional data log. At a sampling interval of one minute, all gas concentrations and operating conditions, together with their respective dates and times, can be documented for a period of around 50 hours. Personal and session IDs can also be recorded. With the aid of the GasVision software package, the recorded data can be analysed, visualized and edited. Data is transmitted via an infrared interface. ST-133-2003 the Auto Zoom function allows an enlarged display of measured values if fewer than five sensors are active. Multiple charger station Ulf Ostermann Dräger Safety AG & Co. KGaA firstname.lastname@example.org Calibration possibilities The instrument can be calibrated in various different ways. Fresh air calibration and freely configurable individual gas calibration or mixed gas calibration are available. Once calibration has been carried out successfully, the quality of the calibrated sensor is displayed in graphic form, allowing the service ST-3080-2044 ST-3078-2004 shows a bar graph of the ppm range with concentration changes in 50 ppm increments. For added support, the instrument emits a rising or falling tone, a bit like a Geiger counter, to indicate the gas concentration detected. Accessories A wide range of accessories is available for the Dräger X-am 7000: for example, a multiple charger station, the E-Cal module for automatic adjustment, the GasVision PC software for outputting and displaying the recorded data, and the CC Vision PC software as a tool to help service technicians configure and calibrate the instrument, providing optimum support for internal company processes in the service technician’s or safety engineer's workshop.
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