Bacharach H25-IR - Manual (Page 27)

H25-IR Calibration
Instruction 3015-4342 21
3 Calibration
It is recommended that a calibration be performed after the initial warm up and then once every 2 – 4 hours
there after. During the calibration cycle internal pressures and flow rates are stored which are used to
determine leak rate and detect proper flow. A flow fault indicates a change in pressure since the time of the last
calibration cycle. This can be due to particulate build up on the probe tip or internal filters as well as swings in
atmospheric pressure due to weather changes (if a long time has elapsed since the last calibration cycle). Most
flow faults can be cleared by simply performing a new calibration.
When the instrument is supplied with an internal leak source, the operator can choose between two types of
calibration: Internal or External. Internal calibration uses the instrument’s built-in leak source, while External
calibration uses a customer supplied calibrated leak source.
If the instrument is supplied without a leak source, then the option of selecting the calibration type is removed
from the menu system. The only option for this model of instrument is to calibrate using an external leak source.
3.1 Selecting Internal or External Calibration
Use the Main Menu > CAL DATA > CAL TYPE function to select either Internal or External calibration. If
External calibration is selected, then also use the EXT RATE and EXT GAS TYPE functions to enter the
characteristics of the external leak source.
Display the Calibration Data menu by first pressing both the ENT and ESC buttons on either the instrument’s
front panel or Smart probe at the same time to display the Main menu. Next, use the Up and Down buttons to
highlight “CAL DATA”, and then press ENT to display the Calibration Data menu.
Main Menu:
SYSTEM
LOG
SETUPS
CAL
DATA
DIAGNOSTICS
3.1.1 Internal Calibration Selection
From the Calibration Data menu, use the Up and Down buttons to highlight “CAL TYPE”, and then press ENT
to display its setup screen. Use the Up and Down buttons to highlight “INTERNAL”, and press ENT to make the
selection and return to the Calibration Data menu. Press ESC as required to return to the Data Display screen.
Calibration Data Menu:
CAL TYPE
EXT RATE
EXT GAS TYPE
CAL FACTOR
RESTORE FACTORY CAL
CAL INTERVAL
ENFORCE CAL INTERVAL
LAST CAL DATE
CAL TYPE INTERNAL
EXTERNAL