Bacharach H-25C, Инструкция

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H-25C Instruction Manual
Instruction 3015-0216
37
Note : The search mode alarm point simply represents the value of the 100% point determined by
the sensitivity ("GAIN" switch setting). The search mode alarm point does not initiate any action.
•
Whenever the sensor output level is below the search trigger point (the 20% point on the bar
graph), the " auto-zero " function acts to keep the indication at 0%.
If the sensor output level is equal to or higher than the search trigger point, the auto-zero function
action stops, and the value is displayed taking as the zero reference (0%) point the last auto-zero
value measured before auto-zero action stopped. If a value equal to or higher than the search
mode trigger is encountered continuously for 20 seconds or longer, the " calibration request "
action will start (see Subsection 4.2.3).
•
If the value is 10% or higher, the speaker sounds an continuous tone. The higher the value, the
higher the tones (approx. 10 to 2000 Hz, hierarchically change). The probe indicator lamp lights with
the tone change.
If you have difficulty in searching for a leak due to unwanted gas in the atmosphere I
Ambient gas levels high enough to exceed the search trigger level will not only interfere with the
discovery of leaks, but will also result in annoying calibration requests. (A calibration request is generated
whenever the search mode trigger level has been exceeded continuously for a 20-second period.)
Note : A calibration request is also generated when the time elapsed on the calibration request timer
reaches the calibration request interval time setting.
If you have this problem, do one of the following:
•
Pull the Nominal 0% Point Up to the Level that has exceeded the Search Trigger Point:
Pressing the probe switch one time only for not more than 0.5 seconds will actuate the autozero
function, and update the background potential. (Note that pressing it more than 0.5 seconds will
provide pass/fail mode.)
This method is effective for locating leaks when the background potential does not change.
•
Lower the Sensitivity Multiplier:
If the sensitivity multiplier has been set to 10 or to 5, changing to a lower multiple (this will increase
the search mode alarm point value) may have a favorable effect.