Met One Instruments ES-405 - 8 MAINTENANCE and TROUBLESHOOTING; Basic Problem and Cause;Solution Table

ES-405-9800 Manual Rev A Page 24
8 MAINTENANCE and TROUBLESHOOTING
This section provides information about routine maintenance of the ES-405, and for performing
more detailed diagnostic tests if a problem is encountered. The ES-405 generates error messages
on the display or in the data log if a failure or other problem is detected. Many times, there is a
simple solution. Persistent errors often signify a failure which will require investigation.
WARNING: The ES-405 Particulate Profiler can only be serviced or calibrated by factory-
authorized personnel. Unauthorized maintenance on the Particle Profiler may result in exposure to
laser radiation that can cause blindness and void warranty.
The ES-405 is an extremely component-dense assembly! Only skilled and trained electro-
mechanical technicians should attempt any disassembly or repairs inside the ES-405. Routine
maintenance procedures do not involve removing the ES-405 assembly from the enclosure.
Calibrating particle sensors like the one in the ES-405 Particle Profiler requires specialized
equipment and a skilled technician. Met One Instruments maintains a calibration facility for
calibrating particle counters according to industry-accepted methods using NIST traceable
standards. The ES-405 Particle Profiler should be calibrated on a 24 month basis.
8.1 Basic Problem and Cause/Solution Table
The following table contains information on some of the more common ES-405 problems which
may be encountered, and some steps to identify and remedy the problems. Met One welcomes
customer suggestions for new items to include in this section of future manual revisions. If the
solution cannot be found in the following table, then contact one of our expert service technicians
for help in resolving your problem.
Problem:
The ES-405 won’t start a measurement cycle.
Cause/Solution:
• You must press the START SAMPLE key to start continuous operation.
• The unit will not start a cycle if the input DC voltage is below the restart threshold,
such as 10 volts DC.
Problem:
Flow failures or low flow.
Cause/Solution:
• Check the filter. This must be replaced periodically.
• Try to DEFAULT the flow sensor calibration. If corrupted flow cal parameters are
entered into the flow calibration, it may appear that the flow system is not working.
• Verify the internal AT and BP sensors function. They appear as FT and FP on the
main screen when their output is enabled. Failed sensors can affect the flow.
• The sample pump itself will eventually wear out and need to be replaced. It should
last at least a year under normal conditions. Check the other possibilities first.
Problem:
Optical system alarms and failures
Cause/Solution:
• The ES-405 must be periodically returned to the factory for optical system cleaning.
The period will depend on your particulate levels.
• Check the filter and replace as needed.
• The laser diode has a finite lifetime which will be reduced at high temperatures. It
may eventually fail and need to be replaced at the factory.