Bacharach H25-IR - Manual (Page 46)

Parts &Service H25-IR
40 Instruction 3015-4342
5.1.7 Auto Gain
IMPORTANT! The instrument must be sampling fresh air (zero gas) when the Auto Gain function is selected.
Selecting the Auto Gain function automatically sets the IR Detector’s voltage to its baseline 0 ppm level by
controlling the instrument’s digital potentiometer (DIGIPOT) circuit.
5.2 Factory Menu
The Factory menu is used to set up or troubleshoot the instrument. This menu appears only when activated by
factory personnel or service technicians who know the correct activation procedure.
When activated, display the Factory 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 “FACTORY” and then press ENT to display the Factory menu.
Main Menu:
SYSTEM
LOG
SETUPS
CAL
DATA
DIAGNOSTICS
FACTORY
5.2.1 DIGIPOT
IMPORTANT! The instrument must be sampling fresh air (zero gas) when adjusting the DIGIPOT value.
The DIGIPOT function allows manual and a more precise adjustment of the digital potentiometer, which
controls the voltage of the IR Detector. Use the Up and Down buttons to adjust DIGIPOT value until the IR
VOLT reading is 4.200 ±0.0500 volts. Press ENT to save the new DIGIPOT value.
5.2.2 Leak Rate
The Leak Rate value is set to match the leak rate of the internal leak source as indicated on the tag attached to
the leak source. Use the Left and Right buttons to move the blinking cursor across the screen to highlight the
digit to be modified, and then use the Up and Down buttons to modify that digit. Press ENT to save the new
Leak Rate value.
LEAK RATE 2 5.5 g/yr
DIGIPOT=197
IR VOLT=4.2000
Factory Menu:
DIGIPOT
LEAK
RATE
LEAK GAS
LEAK TEMP
LEAK TEMPCO
SENSOR CAL
MODEL SELECT
PROBE TYPE
FIRMWARE
DIGIPOT=197
IR VOLT=4.2000