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Page 13 of 56
Zero Adjust
•
To ensure air entering the instrument is
clean, install the zero air filter in the
instrument’s intake and sample until the
readings stabilize.
•
While pressing the ZERO button, turn the
ZERO ADJUST potentiometer (shown at
right) using the trimmer tool until the
digital meter reads 0.
If the LCD reads H, turn the ZERO
ADJUST counter-clockwise;
If the LCD reads L, turn the ZERO
ADJUST clockwise.
NOTE:
A minimum 30-minute wait after the sensor regeneration cycle is
complete ensures maximum sample accuracy. The unit can be used
immediately following the sensor regeneration if necessary. When the sensor
regeneration is complete, press ZERO and adjust the ZERO ADJUST pot until
0 appears on the display. Install the zero air filter in the intake and take several
samples or lock the instrument into survey mode (see page 15). After
approximately one minute, stop sampling and check the ZERO. Adjust to 0 if
necessary. Repeat sampling through the zero air filter until sensor remains
on 0.
NOTE:
When ZERO is pressed, depending upon internal configuration, a
number between 00 and 100 may appear on the display instead of H, L, or O.
See APPENDIX B - INTERNAL DIP SWITCH SETTINGS on page 43 for
details. If the instrument is configured with Option Functionality, see
APPENDIX D - JEROME
431-X OPTION FUNCTIONALITY beginning
on page 46.
CAUTION:
Do not turn the ZERO ADJUST potentiometer between samples.
Turn the ZERO ADJUST only after a sensor regeneration cycle otherwise
invalid readings will result.
•
Press the power OFF button and disconnect the power cord.
•
The Jerome
®
431-X is ready for sampling.
CAUTION:
The Jerome
®
431-X is intended for vapor use only. DO NOT
allow the probe or the instrument's intake to be exposed to
liquids, dust or other foreign material. Moisture or liquids
drawn into the instrument can damage the sensor and flow
system.
