Oldham olct ir, Техническое руководство

Страница: 22 / 36

14 User Manual
5. MAINTENANCE
Warning: Operations described in this paragraph are reserved for authorized and trained people otherwise
the safety of the installation may be impaired.
Do not open the OLCT IR housing since it contains an inert gas. If the detector has been opened, it shall be
returned to factory for repair.
Inspection and maintenance operations must be conducted in accordance with EN60079-17 or IEC 60079-17
(edition in force) or any other domestic standards.
The OLCT IR is designed to require minimal maintenance.
The maintenance is limited to the regular inspection of the detector head.
5.1 Corrective maintenance
Optical surfaces only need to be cleaned in the event of an optical disturbance (output current of 0.5 mA) or
signal drift:
- remove the weather protection (Rep. 1 Fig. 2)
- clean the optical surfaces with a soft, lint-free cloth and isopropanol alcohol
- if necessary, clean the optional bug guard and the protective cover
- let dry
- place the weather protection back and make sure the arrow looks upward
5.2 Periodic maintenance
Gas detectors are safety devices. OLDHAM recommends the regular testing of fixed gas detection
installations. This type of test consists of injecting the standard gas into the detector at a sufficient
concentration to activate the pre-set alarms.
The frequency of gas tests depends on the industrial application in which the detector is in use. Frequent
inspections should be made in the months following the commissioning of the installation, and then become
more widely spaced provided that no significant deviation is observed. The interval between tests should not
exceed 12 months. If a detector should fail to react when in contact with the gas, calibration is essential.
The site manager should put safety procedures in place on-site. OLDHAM cannot be held responsible
for their enforcement.
!