Single Gas Instrument Service ManualInstruction 0019-9166 Bacharach, Inc. Page 72.3 CleaningThe inside of the chamber assembly is the only part of the instrument that needsto be cleaned. To clean the chamber assembly, proceed as follows:Equipment Needed:• Screwdriver, No. 1 Phillips head • Clean rags• Screwdriver, 1/8" flat-blade • Cotton Swabs• Warm soapy water • Pipe cleaners• Allen Wrench, .05 in.Procedure:1. Open the case as described in Section “2.1 Opening the Case.”2. Using a flat-blade screwdriver, remove the three screws and nuts that securethe Sensor to the chamber assembly; DO NOT remove the sensor wires.Then remove the Sensor along with its O-ring and Membrane from thechamber assembly.3. Using a No. 1 Phillips-head screwdriver, disassemble the chamber assemblyby removing the two screws and nuts that secure the Chamber to the MotorAssembly(Fig 2-3).NOTE: Do not remove the Fan Assembly unless it's absolutely neces-sary for cleaning or repair purposes.4. If it is necessary to remove the Fan Assembly, first loosen the set screw onthe Fan Assembly with the .05 in. Allen wrench, and then pull off the assem-bly.NOTE: It is not necessary to disassemble the Motor Assembly. Ifmotor replacement is required, refer to Section 2.6, Step 5.5. Clean the Fan Assembly, Chamber & Motor Assembly (see Fig 2-3) usingcotton swabs and clean rags dampened with warm, soapy water. After clean-ing, dry all parts with clean dry rags and cotton swabs.NOTE: Replace, DO NOT CLEAN, the Membrane (Fig 2-2) if dirty.6. Clean the Chamber’s inlet and outlet ports using pipe cleaners dipped inwarm, soapy water. After cleaning, dry them with clean dry pipe cleaners.7. Reassemble the chamber assembly as follows:NOTE: DO NOT overtighten any screws; damage to plastic partswill result.