Model and Codes -A - Always A Options: /CV - Check valve (*8) /SCT - Stainless steel tag plate (*9) NOTE: When using ZR22S as CE marking compliance product, select -A (ATEX certified flameploof). The cable entry devices (cable glands etc.) and blind plugs shall be in type of protection Ex "db" or Ex "tb",suitable for the conditions of use and correctly installed. They shall provide a degree of ingress protection of at least IP66. Used with the ZO21P High Temperature Probe Adapter. Select flange (-Q). The thickness of the flange depends on its dimensions*5 The thickness of the flange depends on its dimensions The flange thickness does not conform to JIS specification. Piping for reference gas must be installed to supply reference gas constantly at a specified flow rate. When selecting code -B (FM certified explosion-proof) or -C (CSA certified explosion-proof), select code -T (1/2 NPT). Specify either /CV or /SV option code. Specify either /SCT or /PT option code.