4. OPERATION
(15) Press ok.
The LCD screen displays the message:
Apply Gas then <OK>
(16) Connect the Flow Housing (using either gas pipe) to the regulated cylinder containing a
knownconcentrationofthetargetgasatapproximatelythesensoralarmpoint,e.g.50%LEL
Methane in air.
It is recommended for most sticky gases the tubing should be PTFE with short pieces of
rubbertubetomakethenalconnectionduetotheinexibilityofPTFE.Thisminimises
adhesion of the gas to the tube surface and allows for more accurate measurement.
WARNING
As some test gases may be hazardous, the Flow Housing
outlet should exhaust toasafe area.
!
(17) ApplythetargetgastotheCertiedSensor.
Passthegasthroughtheowhousingatarateofbetween0.7l/mand1.0l/m.Waitforthe
gas reading to stabilise before continuing
Note: CertiedSensorsshouldbecalibratedatconcentrationsrepresentativeofthosetobe
measured.ItisalwaysrecommendedthattheCertiedSensoriscalibratedwiththetarget
gas it is to detect.
Caution: WheretheusercalibratesanyCertiedSensor using a different gas, responsibility
for identifying and recording calibration rests with the user. Refer to the local
regulations where appropriate.
(18) Press ok.
The LCD screen displays the message:
Calibrating - Wait
(19) Whencalibrationissuccessfullycompletedthemessageisdisplayed:
Success! OK:Continue
Ensure that the sensor and the vicinity around it is clear all traces of the calibration gas before
continuing. This is to avoid triggering spurious alarms.
If calibration fails at any point discard the cartridge and replace with a new one
(see Chapter 5).
(20) Pressok.
The Calibration Menu is displayed.
(21) Press the esc button twice.
The Main Menu and then the Gas Reading screen is displayed.
(22) Removethetestequipment,retthesensorcaptothesensor(withreinstalledlterif
previously removed for the test) and return the system to normal operation (see 4.2).
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