Ion Science Cub - Manual (Page 36)

CUB MANUAL Ion Science Ltd
Page 36 of 42
Unrivalled Detection. www.ionscience.com
Maintenance
Note: With the Filter Disc (2) and O Rings (3 and 5) correctly fitted the Cub has a IP rating of 65
(independently tested by BASEEFA). With the Filter Disc and O Rings removed the IP rating will drop
to 43.
PID Sensor/Lamp Replacement and Cleaning
When using your Cub 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 Cub 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 Cub is a sensitive detector. Internal components must be handled with clean hands and clean
tools. The Cub lamp is fragile. Handle with great care. Never touch the window and do not drop!!
To remove the MiniPID Sensor (4) for cleaning or lamp replacement, first ensure that the Cub 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 (1) (see image below). The Sensor Cover can be removed by
unscrewing using your fingers.
Carefully lift/pull the MiniPID Sensor (4) from the Instrument Body (6)
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.
VERY IMPORTANT NOTE: For the placement of Lamp into the Sensor body.
Place the MiniPID Stack on a flat surface
– with the visible O’Ring and electrode stack uppermost.
The Lamp must be placed window face down onto the MiniPID Stack and gently rotated so that it is gripped
snugly by the O’Ring.
Then the MinPID sensor is carefully brought down over the back of the lamp and while carefully aligned with
the resting MiniPID Stack, the senosr body is to be brought firmly down until the MiniPID Stack clicks into
place onto the Sensor body.
This procedure ensures that lamp is firmly abutt the elctrode stack for consistent and reliable VOC readings.
Lamp placement by any other means is likely to give unreliable readings because the oring becomes
entrapped between the window face and the electrode stack.
The instrument MUST be re-calibrated after fitting a replacement or cleaned lamp.
CAUTION!
Never refit a damaged lamp!