E2648-PID User Manual
Annex 4 Calibration and maintenance
Do not perform any maintenance operation with the power on.
Clean the device with soft damp cloth. Do not use any abrasive cleaning agents. Do
not immerse the device into water or any cleaning media.
NOTE
Cleaning instruments and spare parts are not included to the delivery set,
please contact your Seller for more information.
How often the PID needs maintenance
The frequency of calibration and maintenance depends on operating conditions
(VOC concentration, humidity, dust and oil in the air etc).
In clean indoor air with low VOC concentration a monthly or less frequent
calibration is recommended. When higher VOC concentrations are measured under
harsh conditions, perform calibration and maintenance more frequently.
The PID needs maintenance:
If the baseline is climbing after you zero the PID – replace electrode stack
If the PID becomes sensitive to humidity – replace electrode stack
If the PID cell shows signs of contamination after the lamp window has been
cleaned – replace electrode stack
If the PID cell is known to have been subjected to severe contamination– replace
electrode stack
If the baseline is unstable or shifts when you move the PID – replace electrode
stack
If sensitivity has dropped too much (note the change required when checking
calibration) – clean the lamp
if the signal to noise ratio at low VOC concentrations becomes inadequate –
replace the lamp
Cleaning of the PID lamp is recommended as the first action when a PID needs
maintenance. It is recommended to recalibrate the device every time after stack
replacement or lamp cleaning.
Removing the electrode stack and lamp
Always use the Electrode Stack Removal Tool to remove the electrode
stack; any other tools may damage your PID and invalidate your warranty.
To remove the electrode stack, proceed as follows:
1. Gently remove the sensor from equipment.
2. Place the PID, pellet side down, onto a clean surface.
3. Locate electrode stack removal tool into the two slots on the sides of the PID and
squeeze together until electrode stack and lamp are released.
4. Carefully lift the PID body away from the pellet and lamp.
5. Occasionally the lamp may be temporarily lodged in the cell and will need to be
freed carefully with tweezers.
6. Occasionally the small spring behind the lamp will come out when the lamp is
removed from the sensor. Simply replace it into the sensor house.
Cleaning the PID Lamp
Always use recommended cleaning kit to clean the lamp.
Inspection of the lamp may reveal a layer of contamination on the detection window
that presents itself as a 'blue hue.' To check for contamination, hold the lamp in
front of a light source and look across the window surface To avoid contaminating
the sensor and affecting accuracy, do not touch the lamp window with bare fingers.
You may touch the body of the lamp with clean fingers.
PID lamp cleaning kit
The vial of cleaning compound contains alumina (CAS Number 1344-28-1) as a
very fine powder. Please contact your Seller for full material safety data sheet
MSDS.
Key safety issues are identified below:
Hazard identification: May cause irritation of respiratory tract and eyes
Storage: Keep container closed to prevent water adsorption and contamination
Handling:
• Do not breathe in the powder. Avoid contact with skin, eyes and clothing
• Wear suitable protective clothing
• Follow industrial hygiene practices: Wash face and hands thoroughly with soap
and water after use and before eating, drinking, smoking or applying cosmetics
• The powder carries a TVL(TWA) limit of 10 mg/m
3
PID lamp cleaning kit
1. Open the container of alumina polishing compound.
2. With a clean cotton bud, collect a small amount of the powder.
3. Use this cotton bud to polish the PID lamp window. Use a circular action,
applying light pressure to clean the lamp window. Do not touch the lamp window
with fingers.
4. Continue polishing until an audible “squeaking” is made by the cotton bud
moving over the window surface. (usually within 15 seconds)
5. Remove the residual powder from the lamp window with a clean cotton bud. Care
must be taken not to touch the tips of cotton buds that are to be used to clean the
lamps as this may contaminate them with finger oil.
6. Ensure the lamp is completely dry and remove any visible signs of contamination
before refitting.
Re-fitting the PID electrode stack and lamp
WARNING
: Never refit a damaged lamp.
1. Place the lamp inside the O-ring seal in the pellet as illustrated below.
Twisting the lamp slightly during insertion will help to ensure the lamp window is
snug against the electrode stack’s front electrode. The lamp should be freely
supported by the O-ring.
2. Continuing to hold the electrode stack between forefinger and thumb, carefully
insert the lamp into recess in the sensor ensuring that the lamp remains in position.
Press the electrode stack firmly, to ensure that the electrode stack wing clips are
engaged, and the top faces of the electrode stack and sensor house are flush.
3. Refit the sensor into the sensing equipment.
4. Recalibrate the gas detector.
Discarding the PID electrode stack
The electrode stack does not have any toxic components, however, if it has been
contaminated by toxic materials, show due care when disposing.
Feel free to contact us if you have questions.
Electrode stack
Electrode stack removing tool
