Safety-relevant examination of laboratory departures

One of the most important safety devices in the laboratory are the laboratory departures. Work, with which gases, steams or suspended matters in dangerous concentrations can occur, may be implemented for the protection of the persons employed in principle only in operator-safe laboratory suits. With the increasing requirements at their protective functions also the yardsticks rise for the evaluation of security and the efficiency. Only a consistent execution and a complete documentation of the examinations can ensure security when working under laboratory departures. Operators of laboratory departures it is long well-known that the former DIN standard replaces 12924 since autumn 2003 by the European standard EN 14175, and/or was supplemented. Since December 2004 now also the fourth part of this EN standard is valid. In this part different suburb testing methods are described.These examinations were allowed for safety reasons a very high meaning and therefore in accordance with relevant regulations and guidelines only by adept and/or qualified persons be accomplished. Since the examinations must be accomplished in accordance with mentioned above standard repeated, here, depending upon check extent, very much workload is bound necessarily and. A misalignment of these examinations to a suitable, external and independent Dienstleister can be quite meaningful from economic criteria. The calibration specialists of Testo industrial services have the necessary expertise and the highly exact equipment around the important task of the safety-relevant examinations standard to accomplish.Without dealing more in greater detail with the detailed demands for standard, the following main parts of a meaningful, regular examination crystallize: General visual inspection of the safety-relevant condition mechanical examination; Control of the front slidegate valve mechanics determination of the flowing in speed at the front slidegate valve opening determination of the exhaust air volume stream (connected load as regards ventilation) the examinations of the aerial engineering function are from very great importance. If this is the only one nevertheless, safe possibility, of guaranteeing the correct function mode of the departure. Even the often inserted continuous monitorings are not necessarily a guarantor for the correct enterprise of the exhaust air distance.Allegedly functioning laboratory departures are not used unknowingly rarely - the possible consequences can be substantial. So that the result of these investigations as regards ventilation has existence, also the used measuring instruments and measuring procedures for this task must be suitable beside adept test personnel. The equipment used for measurement must on the one hand intact and further valid, as well as to be restorable calibrated. For the measurement an impeller anemometer with large diameter and small approach speed can be used, as well as a heat wire anemometer. If the measurement with an impeller anemometer is accomplished, even the approach characteristic and the measured value-dependent error must be considered with apparently simple impellers. The more exact method is the measurement with the heat wire anemometer. With the employment of this probe the measuring person must know the behavior of the flow probe exactly.Beyond that the examiner must possess sufficiently experience with the application of these measuring techniques. An error of up to 20% or more is quite possible during incorrect messdurchfuehrung - with devastating effects on the total result. From the safety thought regarded this is not critical, because the errors always certify a too low measured value. The operator will be interested however from economic view in the fact that its departures become "badly examined" not falsely and it must draw operational conclusions from it. By laboratory departures long clearly that it, not least for the protection of its coworkers, has the obligation, depending upon result of the examination, the use of the plants is to be released or limited to each operator. Finally those is conscientiously and completely led documentation a safe measure for the quality of the examinations.Apart from a clear and comprehensible identification of the laboratory departure also the operational sequence of the entire examination should have to be recognized. This contains the test catalog which was used exactly the same as the accomplished range of the examination. A respectablly issued documentation takes furthermore to purchase to assigned test and aids and describes reproducibly the expiration of the procedure. A conformity statement on the document, as well as marking the examined departure by a plaque are natural, are here however the completeness because of mentioned. In summary it can be said that a safety-relevant aspect is the basis for the standard examination of laboratory departures, with which very responsibly be gone around must. Reliably the expenditure of these examinations is very extensive.The security situation should induce however each operator from laboratory departures to select a high standard and not with "abgespeckten itself" cheap solution contently to give.