TVOC 2 MANUAL
Ion Science Ltd
Page 24 of 32
Unrivalled Gas Detect
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Maintenance
Assembly of MiniPID electrode stack, lamp and body.
6.
Lay the electrode stack front face down on a clean, flat surface and then screw the lamp down into the O-
ring until it firmly abuts against the front electrode face.
7.
Place the PID body carefully down over the lamp-stack sub-assembly so as not to disturb its seating within
the electrode stack. and then push the body firmly onto the face down electrode stack so that both wings
engage with the PID body.
8.
Inspect the sensor to confirm that both wings of the electrode stack have engaged with the PID body.
9.
Refit the PID sensor into TVOC 2.
Ensure the stack is at the
12 o’clock position before
inserting the
sensor
. It
should insert into the
connectors
easily,
if
significant resistance is felt,
remove and check alignment
before reinserting.
Warning
:
Do not assemble using a damaged lamp as this may rupture the stack’s lamp O-ring seal.
Irreparable damage will be caused by forcing the PID into the
sensor housing
if not correctly aligned.
NOTE: Always calibrate TVOC 2 after servicing is carried out.
Fuse rupture and replacement
TVOC 2 has a 125 mA BASEEFA certified fuses to provide intrinsically safe protection when the unit is installed in
hazardous areas.
A fuse may rupture for example due to over voltage or a current surge, if this is the case replacement is different
depending upon the application being intrinsically safe (IS) or not.
For IS or Zone 2 applications the unit must be inspected and have the fuse replaced by Ion Science Ltd or an Ion Science
Approved Service Centre. The intrinsically safe rating is not maintained if the fuse is simply replaced.
For non-IS applications the fuse may be replaced by an equivalent rated fuse and operation tested by qualified
engineering personnel.
Lamp Warranty Statement
Please note: The standard warranty period for a 10.6 PID lamp is one year.
Diagram 21
Electrode stack at
12 o’clock position
