MSA Senscient ELDS 1000 series, Operating Manual

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Maintenance
Senscient ELDS™
Rev 15 115
GB
6. Maintenance
Senscient’s ELDS™ 1000 / 2000 Series OPGDs are designed to require minimal routine
maintenance. ELDS OPGD unit’s contain no user-serviceable parts and are supplied factory-
calibrated for life, with no need for in-service re-calibration.
CAUTION
Senscient ELDS™ OPGDs do not contain any parts that can be repaired or replaced by users.
Do not open either the Transmitter or Receiver unit. The warranty of units which have been
opened may be invalidated.
Senscient’s ELDS™ 1000 / 2000 Series OPGDs feature the most advanced self-testing and self-
diagnosis technologies incorporated into gas detection products for use in safety applications. The
operation of these self-testing and self-diagnosis systems have been analysed by third party
experts in safety integrity; and found to provide an exceptionally high Safe Failure Fraction (SFF),
with very few failure modes that will not be detected. A Safety Instrumented System employing
ELDS OPGDs will meet the requirements of SIL2 per IEC 61508-1 by proof tests being performed
upon the ELDS OPGDs at an interval one to two years. The recommended proof test for an ELDS
OPGD is an operator witnessed SimuGas Auto or SimuGas Live test. (See “Exida – ELDS FMEDA
& SimuGas Proof Test.pdf”)
THE TRANSMITTED LASER BEAM IS CLASS 1 (EYE-SAFE) PER IEC 60825.
6.1. Scheduled Inspection, Cleaning & Testing
Senscient is aware that many of the sites and facilities using gas detection equipment have
working practices or procedures that require gas detectors to be serviced and tested in
accordance with a schedule.
For the majority of applications, Senscient would recommend that a scheduled maintenance and
testing visit be made to ELDS OPGDs annually.
Where experience of the operational conditions at a particular facility indicate that more regular
maintenance visits would be beneficial, users should schedule visits at the frequency required to
maintain gas detection system availability at the level appropriate to the application.
The following short procedure suggests the actions that users should consider including in any
scheduled maintenance and testing of ELDS OPGD systems:
Inspect the ELDS™ OPGD units and cabling for signs of physical damage. If cabling is (1)
damaged, repair the damage or replace the affected cabling with new cable and/or
connectors. If an ELDS OPGD unit has suffered mechanical damage that appears to have
compromised the flameproof explosion-proof protection of the unit, remove the unit from
service and return it to Senscient for factory examination and repair.
Clean the lens-windows of the Transmitter and Receiver units. (See section 6.2) (2)
Interrogate the Event Logs of both the Transmitter and the Receiver units; and confirm that (3)
the results for SimuGas Auto tests are as expected.
Review the Event Logs and the Diagnostics screens using SITE, looking for any active Faults (4)
or Warnings. In the event that active Faults or Warnings are present, investigate these
further; and attempt to clear these conditions before leaving the system. Where the root
cause of active Faults or Warnings cannot be identified or remedied, download a snapshot
from the affected system and send this to Senscient for expert review and advice.
Check the signal level reaching the Receiver and comparing this to that which was obtained (5)
and recorded when the system was first installed and commissioned.