All versions of the Dräger Pac family are tailor-made for personal monitoring in daily work settings. One of the chief aims during the development process was to design sturdy and durable instruments of a size perfectly adapted to their intended use which can be used for long periods without the need to replace the sensor. The impact-resistant housing is coated with rubber for protection and is resistant to corrosive chemicals. The instruments meet the requirements of IP 65, and have EMC protection conforming to the IEC specification.
Detlef Ott
The family of Dräger Pac instruments includes different versions of single-gas detectors and warning instruments. Specially adapted to individual applications, they are routinely used in industrial settings for all kinds of tasks. The different instrument types offer different operating times (anything from 100 days to unlimited use), a status and/or concentration display, an event logger (Pac 5000), replaceable sensors and a data logger (Pac 7000). Depending on the particular type and sensor, the instruments can be used to measure gases such as carbon monoxide, hydrogen sulphide, oxygen, ammonia, hydrocyanic acid, chlorine, carbon dioxide, hydrogen phosphide, sulphur dioxide and nitrogen dioxide.
The large display presents information in large numerals or symbols rather than in text form. The display can be used language-free. The display is illuminated in the event of an alarm, or at the push of a button, to make it easier to read. The Pac 1000 and Dräger Pac 3000 instruments feature a status display which shows the gas type to be measured, the actual concentration present if an alarm is given, the operating time, as well as mes-sages and warning functions. In the case of the Pac 5000 and Pac 7000, the screen continuously displays the current concentration.
Secure attachment to clothing is an essential prerequisite in personal monitoring. A stable and securely locking alligator clip made of stainless steel reliably fixes the instrument in place on the user’s clothing. To allow for individual wearing preferences, the alligator clip is rotatable. The two alarm lamps are positioned at the corners of the instrument. Naturally, the gas inlet for the sensor must not be covered or obstructed when the instrument is fitted to the user’s clothing, and for this reason the sensor is positioned inside the housing such that gas enters from above and from the front – this improves safety and allows for individual wearing of the instrument.
Reliable alarms
To provide reliable protection against hazards, clearly recognizable alarms are essential. In combination with a vibration alarm, audible and visual alarms are triggered if the set alarm limits are violated. A two-tone alarm is used for optimum perception. Two adjustable alarm thresholds are available. A warning is also given at the end of the instrument’s operating time, when the battery capacity is exhausted, and in the event of a malfunction. The Pac 7000 additionally boasts a TWA alarm and an STEL alarm, and displays the peak concentration.
It is the sensors which generally determine whether an instrument is capable of alerting the user to potential hazards as quickly as possible, and ideally virtually instantaneously. The Pac detectors are equipped with a powerful sensor technology: thanks to extremely short electrochemical reaction times and diffusion paths, the new sensors respond as quick as a flash and display any gas hazards which occur more or less instantly. The XXS sensors are sensors “en miniature“, whose compact dimensions allow small instruments which are ideally suited to the task in hand.
Bump test mode for greater functional reliability
It goes without saying that the safety of personnel must always be given top priority. Their safety depends on perfectly functioning detection and warning instruments, which is why many countries have regulations in place which demand regular checks of instrument functions using a known gas concentration. This check is known as a bump or function test. The Dräger Pac instruments feature a bump test mode – if a bump test needs to be carried out, a message appears on the screen. The user can set the bump test interval, and the result of the bump test is saved in the event logger (Dräger Pac 5000) or the data logger (Dräger Pac 7000). A bump test station is available to help perform the bump test.
Individual instrument settings and calibration
For the purposes of individual configuration and calibration, the instrument is connected to a PC via the communication module or the E-Cal system. This combination, together with the Pac Vision or CC Vision software installed on the PC, allows all functions to be configured, the instrument to be calibrated, and stored data to be analysed. The Pac 7000 features a password-protected menu function on the instrument itself which can be used to selected the fresh air calibration and sensitivity calibration.
In the case of the Pac 3000, 5000 and 7000 instruments, an individual operating time can be set, e.g. a calibration interval, an inspection interval or an individual operating time end.
Event logger, data logger
Many users require the instrument to come with an event logger or data logger to enable them to subsequently analyse a particular incident. The Dräger Pac 5000 is equipped with an event logger which can store 60 events, while the Dräger Pac 7000 features a data logger which additionally stores the recorded concentrations on a continuous basis, with the peak concentrations stored at intervals set by the user. When a one-minute interval is set, the data logger has a storage capacity of around five days. The stored data can be downloaded with their respective dates and times using a PC and the installed Pac Vision or CC Vision software, and edited using, for example, Microsoft Excel or the Dräger GasVision software.
Hall 4.1, Booth O24
cpp 436
Dräger’s line of single-gas measurement products
Achema 2006
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