Honeywell Minitrend QX, User Manual

Page: 259 / 324

43-TV-25-30 Iss.6 GLO Aug 07 UK 253
Section 11: Instrument Care and Maintenance
Instrument Care and Manintenance
The X Series range of recorders contains no parts serviceable by the user, except for a
fuse on the DC power supply, see “Fuses” on page 13 .
In the event of a recorder failure contact your nearest Service Department (or an author-
ised agent) to arrange for the return of the unit for repair.
Cleaning Instructions
The recorder’s touch screen can be temporarily disabled for cleaning, see “Clean Screen”
on page 141.
Cleaning the unit should be done with a soft lint cloth and warm soapy water or screen
cleaner recommended for use on a PC. Solvents and prolonged exposure to detergents
can cause damage to the front panel. It is recommended that any cloth used for cleaning
is damp but NOT wet, to avoid water collecting in the unit.
For Nema 4X /IP66 rated recorders (option) refer to the Nema 4X standards.
Backlights
1.
MTTF (Mean Time To Fail) is defined as the time at which 50% of a batch of backlights
remain in excess of half their original brightness i.e. a display has a greater than 50%
chance of being half its original brightness when used at 100% after:
• 55,000 hrs for the Minitrend QX . Maximum luminosity 400 cd/m2, (86,000hr if used at
80%).
• 43,000 hrs for the Multitrend SX . Maximum luminosity 400 cd/m2, (67,000hr if used at
80%).
• 40,000 hrs for the eZtrend QXe . Maximum luminosity 450 cd/m2, (62,500hr if used at
80%).
For this recorder the backlight cannot be changed separately so the display
has to be replaced.
Reducing the brightness can significantly improve the life of the backlight.
2.
At extended temperatures these times are reduced.
3.
The backlight is a consumable item, and will NOT last forever.
4.
A maintenance schedule of exchanging backlights should be every 5 years to maintain
the optimal disk clarity.
Operating Temperature
Operating temperatures are described in “Specification Tables” on page 259 . Prolonged
operation at temperatures over 50 °C will accelerate degradation of the display backlight.
If the unit has been moved from a cold environment into a warm one, ensure that the unit
has reached a minimum temperature of 12 °C or is left to stand for 1 hour at room temper-
ature before applying power, to ensure no condensation remains in the unit.