Ados GTR 210, Руководство по эксплуатации, Страница: 39 / 64

ADOS GmbH GTR 210 Rev 1.16 Page 35
7. Maintenance Operations
An extremely important factor for operational safety is regular maintenance of every gas measuring
system.
The following maintenance work refers to six monthly checks, which may only be carried out by trained
personnel.
The operator of the system is offered the possibility of completing a maintenance contract with the
manufacturer, the ADOS GmbH company, which will guarantee a smooth and efficient servicing by the
company’s own customer service.
For safety-technical reasons, the sensing head should be checked once each year by a specialist.
The maintenance work can be subdivided into transmitter tests of ADOS GTR 210 and testing the
evaluation electronics.
A check of the calibration, with zero gas and calibration gas, must be carried out on all existing sensors,
since the gas sensors age with time and can lose sensitivity.
If the gas transmitter detects during calibration that the sensitivity of the gas sensor is insufficient, the
calibration is interrupted. The measurement cell must then be replaced with a new cell and re-calibrated.
For this purpose, the pressure-proof sensor enclosure can be unscrewed after removal of the locking
screw.
The unscrewable front part contains a water-repellent membrane and a sintered metal that can be
exchanged in case of pollution by exchanging the front part.
A clean membrane and the sintered metal are relevant for the exact measurement and compliance of
the sensor response time t
90.
Following maintenance work, the gas transmitter must be restarted so that an internal self-test is
performed.
DANGER
1. The housing of the GTR 210 may be opened in voltage-free state only.
2. In an explosion-hazard area, replacement of the enclosure or the gas sensor, may be
carried out only in a current-free state of the sensor head, and after at least half an hour
cooling of the sensor!