Land 4500 MKII Premier, Operation And Maintenance Manual

Page: 125 / 139

Model 4500 Premier Dust and Opacity Monitor
125
ERROR DESCRIPTION DIAGNOSIS
NUMBER
6 Motor jammed Zero or span cal motors failed to park.
Check motors and micro-switches.
7 Measure LED fail Signal LED failed.
Check connections. Replace LED.
8 Flood LED failed Flood LED failed.
Check connections. Replace LED.
9 ADC over-range Analogue to Digital Converter value too
high. Check correct aperture fitted on
Retro-Reflector.
Call LAND Instruments International Service Dept.
10 ADC fault Analogue to Digital Converter failed to convert.
Call LAND Instruments International Service Dept.
11 Gain Drift Flood LED fault during calibration.
Repeat calibration. If fault persists
call LAND Instruments International Service Dept.
12 Filter blocked Air Filter pressure switch activated.
Clean/replace air filter.
Check wiring between pressure switch and T-Box.
13 Blower failure Blower pressure switch activated.
Check blower power supply.
Check blower motor.
Check wiring between pressure switch and T-Box.
14 Negative opacity Opacity value < -5%
New installation: Check the path length is correct.
Calibration error: Check calibration.
Re-calibrate if necessary.
IMPORTANT
Whenever the Land Service Department is contacted regarding problems with an
instrument, please have available information on the
instrument type and serial number .
This will enable the department to respond more accurately and efficiently.