• Honeywell recommends that the sensors be bump tested before each day’s
usetoconfirmtheirabilitytorespondtogas.Manuallyverifythattheaudible,
visual, and vibrator alarms are activated. Calibrate if the readings are not
within the specified limits.
• Portablesafetygasdetectorsarelifesafetydevices.Theaccuracyofambient
gasreading(s)isdependentuponfactorssuchasaccuracyofthecalibration
gas standard used for calibration and frequency of calibration.
• The detector is designed for use only in potentially explosive atmospheres
where oxygen concentrations do not exceed 20.9% (v/v). Oxygen deficient
atmospheres (<10% v/v) may suppress some sensor outputs.
• Extendedexposureofthedetectortocertainconcentrations ofcombustible
gases and air may stress the detector element and seriously affect its
performance. If an alarm occurs due to a high concentration of combustible
gases, a calibration should be performed. If necessary, replace the sensor.
• High concentrations of certain toxic gases, for example, H2S, may hurt the
LEL sensor. This effect, known as inhibition, is usually temporary but in
extreme circumstances can impair the sensitivity of the LEL sensor after
any gas exposure that causes alarm in the toxic gas sensors.
• TheHoneywellBW™UltraisprovidedwithanantistaticcoatingovertheLCD
windowtominimizetheriskofignitionduetoelectrostaticdischarge.Periodic
inspectionofthiscoatingisrequiredtoensurenodegradation,delamination,
abrasions or other deformities to this surface.
• Care must be taken to avoid exposure to excessive heat, harsh chemicals
or solvents, sharp edges and abrasive surfaces. Clean the exterior with a
soft, damp cloth.
• The Canadian Standards Association (CSA) requires the LEL sensor to be
bump tested before each day’s use with calibration gas containing between
25% and 50% LEL. The instrument must be calibrated if the displayed
LEL value during a bump test fails to fall between 100% and 120% of the
expected value for the gas.
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