MEDC XB11 - Manual (Page 4)

3.0 OPERATION
The operating voltage of the unit is stated on the unit label. The unit can be powered directly or initiated via a telephone
ringing signal if requested when ordered.
4.0 MAINTENANCE
During the working life of the unit, it should require little or no maintenance. GRP will resist attack by most acids, alkalis
and chemicals and is as resistant to concentrated acids and alkalis as most metal products.
However, if abnormal or unusual environmental conditions occur due to plant damage or accident etc., then visual inspec-
tion is recommended.
If the unit requires cleaning, then only clean exterior with a damp cloth to avoid electro-static charge build up.
Replacement of the xenon tube (see below) can be carried out by competent site personnel. Other repairs should be
undertaken by returning the unit to MEDC or by an authorised repairer of Ex equipment.
If a unit fault should occur, then the unit can be repaired by MEDC. All parts of the unit are replaceable.
If you acquired a significant quantity of units, then it is recommended that spares are also made available. Please discuss
your requirements with the Technical Sales Engineers at MEDC.
Removing / replacing xenon tube
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew and remove the 6 off M5 (4.0mm A/F hexagon key). Keep in a safe, accessible location as they are non-
captive
Twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base. Remove to gain access
to the interior.
Unscrew and remove the two M3 nuts and washers holding the circuit board to the cover pillars. Keep in a safe acces-
sible location.
Lift the electronics assembly away from the support pillars, thus exposing the xenon tube. Remove the old tube by unscrew-
ing the terminal block fixings. The replacement tube can now be fitted (see xenon tube installation sheet, which is supplied
with the replacement tubes)
Replace the electronics assembly onto the support pillars and secure using the two off M3 nuts and washers. Ensure the
retaining strap is fitted to one of the electronics assembly mounting pillars during re-assembly.
Carefully replace the cover assembly back onto the base, avoiding damage to the mating surfaces. Replace the 6 off M5
screws (4.0mm A/F hexagon key) into the holes in the cover assembly and tighten evenly. Ensure the O-ring is seated
correctly on the cover during re-assembly. Ensure the required maximum gap of 0.2mm is maintained between the cover
and the base once assembled
GENERAL ARRANGEMENT
2 M5 X 10 ±1
DIRECT
MOUNTING
HOLES
2 FIXING HOLES
ø8.5 ± 1
OPTIONAL GUARD
ENTRY
'R'
ENTRY
«L»
12/14 © MEDC 2014