Ion Science Tiger - Manual (Page 39)

TIGER MANUAL Ion Science Ltd
Page 39 of 46 Unrivalled Detection. www.ionscience.com
Maintenance
PID Sensor/Lamp Replacement and Cleaning
When using your TIGER in conditions of high ambient humidity, the PID may show unexpected readings
appearing to increase. This occurs due to dust or other small particles within the detector becoming
hydrated with humidity. This causes these particles to conduct a signal between the electrodes. The
problem can be resolved by the user in the field using the procedure below and a can of computer duster air.
In normal use the lamp should be cleaned after every 100 hours of use (based on 30 ppm for 100 hours).
Reduce this if TIGER is used in heavily gas contaminated environments. Please note that some esters,
amines and halogenated compounds may accelerate window fouling; in these cases cleaning may be
required after every 20 hours of use. Cleaning frequency will also depend upon alarm levels set and
prevailing environmental conditions.
CAUTION!
The TIGER is a sensitive detector. Internal components must be handled with clean hands and clean
tools. The TIGER lamp is fragile. Handle with great care. Never touch the window and do not drop!!
To remove the MiniPID Sensor for cleaning or lamp
replacement, first ensure that the TIGER is turned off
and that you are in a clean environment such that the
sensor parts will not be contaminated by dust, oil or
grease. Remove the Sensor Cover (see image on
right). The centre screw may be turned with a small
coin or a suitable flat bladed screwdriver.
Ensure that the Sensor Seal, on the inside of the
Sensor Cover is not disturbed.
Carefully lift the MiniPID Sensor from the Instrument
Body, ensuring that the two Inlet/Outlet Seals remain in place in
the Instrument Body.
Using the special Removal Tool MiniPID Stack (846216)
provided, locate its ‘prongs’ in the slots in the side of the Mini
PID Sensor body. Using the forefinger to restrain the sensor,
(the internal parts are spring-loaded and careless disassembly
will leave you hunting for the spring!) squeeze the tool to
release the lamp housing.
The lamp may now be removed.
To replace the lamp or install a new one, reverse the procedure, ensuring the seals are all in place. When
replacing the Sensor Cover ensure that the markers are aligned correctly and that the cover is a snug fit.
The instrument MUST be re-calibrated after fitting a replacement or cleaned lamp.
CAUTION!
Never refit a damaged lamp!