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Fig 10-2 Gas extractor (type ZBAK1)
Seal fixture Filter case
Locking wing bolt
Handle for filter exchange
O-ring
(JIS P48A Viton)
Metallic mesh filter
10.4
Concentration guarantee term of standard gas cylinder (for NO
x
, SO
2
, CO and O
2
analyzer)
Kind of gas Concentration range Guarantee term
NO/N
2
0.4ppm or more, and less than 250ppm 6 months
NO/N
2
250ppm or more, and less than 5% 1 year
SO
2
/N
2
0.4ppm or more, and less than 250ppm 6 months
SO
2
/N
2
250ppm or more, and less than 1 % 1 year
CO/N
2
2.4ppm or more, and less than 100ppm 6 months
CO/N
2
100ppm or more, and less than 15% 1 year
O
2
/N
2
0.9% or more, and less than 25% 1 year
N
2
— *None
Air — *None
* Schedule the use for about one year under proper control.
Note: It is empirically known that standard gas concentration remains within the adequate accuracy
for 6 months or 1 year. However, gas maker’s guarantee term is as listed in the above table.
Therefore, replacement is required within the guarantee term when importance need be placed
on traceability.
10.5 Maintenance of sampling device
(1) Replacement of filter element of gas extractor (extractor type : ZBAK1)
(a) Turn off power supply to the extractor
(b) Turn off the pump of gas analyzer
(c) After making sure the temperature of extractor has dropped adequately, detach the rainproof cover
(remove the wing bolt on the flange side).
(d) Remove the locking wing bolt and pull out the internal parts while gripping the handle for filter ex-
change.
Although you may feel slight stiffness in pulling out the handle for filter exchange, it should be pulled
out gradually while turning it.
(e) Remove the metallic mesh filter from the seal fixture.
(f) After mounting a new element, reverse the above procedure.