Further questions about day-day operation of your 400A can be answered with use of the RIGAS 400A Calculator Spreadsheet (PH).
RIGAS is equipped to diagnose and repair 400A analyzers in our Wooster, OH, office.
Please inquire for terms and instructions to ship your analyzer to RIGAS for service or repair.
2310 East Hutton Rd
Wooster, OH 44691