RKI Instruments SDM-2009 - Manual (Page 11)

Air Filter and Sample Tubing • 7
WARNING: Do not use an exhaust tube that is longer than 10 feet. The increased flow
restriction caused by a longer tube may affect gas response and cause
inaccurate calibration and bump test results.
A check valve is included with the SDM-2009 but is not needed for the Standalone
configuration. It is used for the PC Controlled configuration.
Two T-fittings are included with the SDM-2009. The larger fitting is for the exhaust
tubing. The smaller fitting is for the GAS tubing. Neither T-fitting is needed for the
Standalone configuration. They are used in the PC Controlled configuration.
Figure 5: Check Valve
For Exhaust
Tubing
For GAS
Tubing
Figure 6: T-Fittings