ion science PhoCheck+ Series User Manual page 53

PhoCheck+ 1, 2, 3 & 5000 Ex
Technical Specifications
Expected lifetime of parts
Batteries
On the condition of normal use battery capacity will be reduced to approximately 70% after 250 full
battery cycles or 1 year (whichever comes first).
New fully charged (rechargeable) batteries at 20 °C > 10 hours normal use.
Affects on battery capacity:
10% less per 10 °C drop in temperature.
As the batteries age they may self discharge to half capacity from fully charged state.
At 25 °C 50 days
37 °C 25 days
48 °C 5 days
60 °C 1 day
The back light will consume an additional 50% power and significantly reduce the instrument on
time .
Filter
The filter should be changed every 100 hours of use. This frequency should be increased for dusty or
moisture laden environments.
PID Lamps
10.6 eV, 10.2 eV and 8.4 eV expected life of 3 years and 11.7 eV 1 month. Lamps are very fragile
please handle with care at all times, never touch the window and do not dro p !
Lamp cleaning for normal use is every 100 hours of use (based on 30 ppm for 100 hours). Reduce this
if used in heavily gas contaminated environments. Please note that some esters, amines and
halogenated compounds may accelerate window fouling cleaning m ay be required for every 20 hours
of use. Cleaning frequency will also depend upon alarm levels set and prevailing environmental
conditions.
PID Cell
Electronic cell has an indefinite life however it may suffer contamination problems it is essential that
a clean filter is attached during use. Some gases such as methelene chloride in high concentrations
may condense on to the walls of the cell. If condensing is severe and cannot be cleaned, then a
replacement may be required.
NB: PID specifications relate to an isobutylene 100 ppm in air calibration at 20 °C and 90% RH.
LEL specifications relate to a methane (CH4) calibration, other gases are available upon request.
Other gas sensors as specified at appropriate international alarm standards.
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Ion Science Ltd