The BP1000 series catalog can be found here.
The new XL□ series catalog can be found here. (Details on the XL series valve with a heat-resistant auto switch can also be found in the new XL series catalog.) 
The new XL□ series catalog can be found here.
An auto switch can be retrofitted in the following cases.
① When the part number on the nameplate of the product indicates it has an auto switch (e.g., XLA-40-2M9NA, etc.)
The FG□ series element replacement procedure can be found here.
Information on industrial filter selection can be found here.
The differences between the 2 are as follows.
Seal material: Select from NBR or FKM for the FQ1 series and NBR or fluororesin for the FGD series.
Housing material: Only stainless steel 304 is available for the FQ1 series.
The CQ2 series catalog can be found here.
The CH2E/CH2F/CH2G/CH2H series catalogs can be found here.
For the seal kit part numbers and the seal replacement procedure for CHKD/CHKG, CHN, CHSD/CHSG/CH2E(W), CH2F(W), CH2G/CH2H, and CHA(W) series cylinders as well as the seal kit part numbers for CHQ(W)B and CHA(W) series cylinders, refer to the “Maintenance Parts List,” which can be found here.
sonic conductance C x 5 = effective area S[mm2]
Cv x 18 ≈ effective area S[mm2]
Formula: (0.3 + 0.1) x 5 = (0 + 0.1) x V
V (volume before change) = (0.3 + 0.1) x 5 ÷ 0.1 = 20 L (ANR)