PhD6 Multi-Gas Detector Reference Manual - Honeywell Analytics

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See section 6.5 for a probe diagram and a listof available sample probe filter replacementkits.4. CalibrationThe accuracy of the PHD6 should be verified ona regular basis. Verification can be as simple asperforming a bump test, which is described belowin section 4.1. If the instrument fails the fresh airtest, then it must be fresh air calibrated beforeuse. If the instrument fails the bump test withcalibration gas, it must be successfully spancalibrated before use.Note: The NDIR-CO 2 sensor used in the PHD6cannot be zero calibrated in fresh air. Forspecific instructions on calibrating the CO 2sensor, proceed to section 4.4.Note: The NDIR-CH 4 sensor used in the PHD6must be calibrated with methane calibrationscale to the actual amount of methane in thecylinder in terms of percent volume methane.See section 4.5 for details.* The Canadian StandardsAssociation (CSA) requires combustible gassensors to be bump tested prior to each day’suse with calibration gas containing between25% and 50% LEL. The functional (bump) testprocedure is covered in section 4.1.** The Canadian StandardsAssociation (CSA) requires combustible gassensors to undergo calibration when thedisplayed value during a bump test fails to fallbetween 100% and 120% of the expectedvalue for the gas.For Honeywell Analytics’ officialrecommendations concerning calibrationfrequency, see Appendix B.4.1 Functional (Bump) testingThe accuracy of the PHD6 may be verified at anytime by a simple functional (bump) test.To perform a functional (bump) test, do thefollowing:1. Turn the PHD6 on and wait at least threeminutes to allow the readings to fullystabilize. If an IR or PID sensor is in use,wait until the stabilization period ends beforeproceeding. If any of the sensors have justbeen replaced, the new sensor(s) must beallowed to stabilize prior to use. See section6.4 for further details on sensor stabilizationrequirements.2. Make sure the instrument is located in freshair.Figure 4.1 Bump Test / Gas calibration set up3. Verify that the current gas readings matchthe concentrations present in fresh air. Theoxygen (O 2 ) sensor should read 20.9%/vol.(+/-0.2%/vol.). The readings for the LELsensor should be 0% LEL. The PID, NDIR-CH 4 and toxic sensors should read 0 partsper-million(PPM) in fresh air. For the NDIR-CO 2 sensor, a carbon dioxide level between0.03% and 0.10% is considered normal infresh air. If the readings deviate from theexpected levels in a fresh air environment,proceed to section 4.2 and perform the freshair calibration adjustment then proceed tostep 4.4. Attach the calibration adapter and connectthe calibration cylinder to the PHD6 as shownin figure 4.1. Flow gas to the sensors.5. Wait for the readings to stabilize. (Forty-fiveseconds to one minute is usually sufficient.)6. Note the readings. Toxic, VOC andcombustible gas sensor readings areconsidered accurate in a bump test if theyare between 90%* and 120% of the expectedreading as given on the calibration cylinder.If the readings are considered accurate, thenthe instrument may be used without furtheradjustment. If the readings do not fall within90%* and 120% of the expected reading asgiven on the calibration cylinder, thenreadings are considered inaccurate. Ifreadings are considered inaccurate, proceedto section 4.3 and perform the gascalibration.*Note: The Canadian Standards Association(CSA) requires combustible gas sensors toundergo calibration when the displayed valueduring a bump test fails to fall between 100%and 120% of the expected value for the gas.Honeywell multi-calibration gas mixturescontain approximately 18% oxygen. Duringthe bump test the oxygen sensor should readwithin +/-0.5% of the level given on thecalibration cylinder.4.2 Fresh Air/Zero CalibrationNote: The NDIR-CO2 sensor in the PHD6 maynot be zero calibrated in fresh air. Seesection 4.4 for further instructions.19
Fresh air/zero calibrationsmay only be performed in an atmosphere thatis known to contain 20.9% oxygen, 0.0% LELand 0 PPM toxic gas.To initiate the fresh air/zero calibration:1. Press the MODE button three times withintwo seconds to begin the fresh air/zerocalibration sequence. The PHD6 will brieflydisplay AUTO CAL and then begin a 5-second countdown.2. Press the MODE button before the end of the5-second countdown to begin the freshair/zero calibration. The fresh air/zerocalibration is initiated when the PHD6 shows“Calibrating” on the screen.→3. The PHD6 will indicate when the freshair/zero calibration is complete. It will thenproceed to a second 5-second countdown forthe gas calibration. If gas calibration is notrequired, allow the countdown to reach 0without pressing the MODE button.→For instructions on the Gas Calibration,proceed to section 4.3.4.2.1 Fresh air calibration failureIn the event of a fresh aircalibration failure, thealarms will be activated andthe instrument will displaythe following screen. Notethat the sensor(s) that failthe zero calibration areshown (in this case, CO)After 3 seconds, the PHD6will return to the current gas readings screen andthe visual and audible alarms will cease.When calibration is due, the triangular warningsymbol along with the span bottle icon thePHD6’s status bar will showIf a successful fresh air calibration is notperformed prior to instrument shut down, thePHD6 will note that Fresh Air Calibration is dueduring instrument start up.Possible causes and solutions1. The atmosphere in which the instrument islocated is contaminated (or wascontaminated at the time the instrument waslast fresh air calibrated.2. A new sensor has just been installed.3. Instrument has been dropped or bangedsince last turned on.4. There has been a significant change intemperature since the instrument was lastused.Recommended action:Take the instrument to fresh air and allowreadings to stabilize. Perform the fresh air/zeroadjustment again. If the manual fresh air/zeroprocedure fails to correct the problem, performthe manual fresh air / zero calibration procedureas described in section 4.2.2 below.4.2.2 Forced fresh air calibrationThe PHD6 includes safeguards to prevent freshair calibration in contaminated environments. Ifthe standard fresh air calibration fails a secondtime, the instrument may be “forced” to acceptthe fresh air calibration by performing the manualfresh air calibration.Fresh air calibrations mayonly be performed in an atmosphere that isknown to contain 20.9% oxygen, 0.0% LELand 0 PPM toxic gas. Performing a fresh aircalibration in a contaminated atmospheremay lead to inaccurate and potentiallydangerous readings.1. Initiate the standard fresh air / zerocalibration sequence by pressing the MODEbutton three times in rapid succession. The5-second countdown will begin.2. Press and hold the down arrow key and thenpress the MODE button before the end of the5-second countdown. Continue to hold thedown arrow.3. The fresh air/zero calibration is completewhen the instrument begins another 5-second countdown for the gas calibration. Ifgas calibration is not required, allow thecountdown to reach 0 without pressing theMODE button.If the PHD6 still fails to calibrate after thisprocedure is attempted, contact HoneywellAnalytics.4.2.3 Fresh air calibration in a contaminatedatmosphereTo fresh air calibrate the PHD6 in a contaminatedatmosphere, connect a cylinder of “zero air”containing 20.9% oxygen and no contaminants tothe PHD6 and flow gas to the instrument. Then20
Page 1 and 2: PHD6Gas DetectorReferenceManualHone
Page 3 and 4: Table of ContentsCERTIFICATION INFO
Page 5 and 6: Appendix B Calibration Frequency Re
Page 7 and 8: 1. DescriptionThe PHD6 is a multi-s
Page 9 and 10: operation, and the visible and audi
Page 11 and 12: 1.10 PHD6 standard accessoriesStand
Page 13 and 14: TimeBattery Status IconThe battery
Page 15 and 16: 2.5.5 Low Battery AlarmsWhen the ba
Page 17 and 18: In diffusion mode, the atmosphere b
Page 19: →Block the sampling inlet by plac
Page 23 and 24: educed oxygen level in the calibrat
Page 25 and 26: two arrow keys while the two blocks
Page 27 and 28: The datalogger samples continuously
Page 29 and 30: 3. Remove the four screws that are
Page 31 and 32: 6.6.1 Replacing pump filters1. Remo
Page 33 and 34: Appendix B CalibrationFrequencyReco
Page 35: Honeywell Analytics Warranty Gas De

PhD6 Multi-Gas Detector Reference Manual - Honeywell Analytics

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