PhD6 Multi-Gas Detector Reference Manual - Honeywell Analytics

→Block the sampling inlet by placing a finger overthe end of the sample probe assembly. Once theblockage is detected, the PHD6 will indicate thatthe test has been passed and instruct you toremove the blockage. Once the blockage isremoved, it will proceed to the current gasreadings screen and the pump icon will be shownin the status bar.without the probe assembly in place,contaminants may cause damage to the pump,sensors and internal components of the PHD6When the pump is active andfunctioning properly, the movingpump icon is shown on the lowerstatus bar on the display. Lowflow or other pump faultconditions activate audible and visible alarms andcause the display of the appropriate explanatorymessage.→If the instrument is unable to detect the vacuumresulting from the pump blockage within 30seconds, the test will fail, the instrument will gointo alarm and you will be directed to remove thepump.Remove the pump and press the MODE button toresume diffusion operation.3.2.2 Turning off the pumpTo turn off the pump, simply remove the pumpfrom the bottom of the instrument. The screenwill show “Pump Fault” followed by “PumpDisconnected”. Press MODE to continue withoutthe pump.→3.2.3 Pump low flow alarmThe PHD6 Pump contains a pressure sensor thatcontinuously monitors for restrictions in airflowcaused by water or other fluids being drawn intothe unit and immediately acts to turn the pump offin order to protect the sensors, pump, and otherPHD6 components from damage.CAUTION: Never perform remote sampling withthe PHD6 without the sample probe assembly.The sample probe handle contains replaceablefilters designed to block moisture and removeparticulate contaminants. If the pump is operated18→Press MODE once the blockage has beencleared to restart the pump.The pressure sensor in the sample draw pump isdesigned to detect pressure changes while thesample-draw probe is being held in a verticalposition. If the probe is held horizontally or at alow angle while inserted into a fluid, a pressuredrop sufficient to cause the pump to shut downmay not be generated, and water could be drawninto the pump assembly causing damage to thepump, sensors and internal components of thePHD6.CAUTION: Insertion of the sample draw tubeinto a fluid horizontally or at a low angle maylead to water ingress and may cause damageto the sensors and internal components of thePHD6.If the PHD6 determines that a significant increasein pressure has occurred, it will go into alarm andnotify the user that there is a blockage of thepump. The display will alternate between thefollowing two screens.Remove the blockage and press the MODEbutton to acknowledge the alarm and resumesampling.3.3 Sample draw probeThe PHD6’s sample draw probe is the standardprobe assembly from Honeywell Analytics. Thesample probe handle contains moisture barrierand particulate filters designed to removecontaminants that might otherwise harm theinstrument.Particulate contaminants are removed by meansof a cellulose filter. The hydrophobic filterincludes a Teflon barrier which blocks the flowof moisture as well as any remaining particulatecontaminants.Sample probe filters should be replacedwhenever visibly discolored due to contamination.