Ametek 888

Alarms | Appendix E-7
Cell Flow Alarm [7]
The Model 888 analyzers regulate sample flow by adjusting a proportional
valve in the aspirator drive air. Ideally, the sample flow rate is approxi-
mately 1.5 SLPM. If the proportional valve reaches its maximum or mini-
mum control range and the flow is incorrect, a Level 2 alarm occurs. This
problem can be caused by insufficient pressure at the valve inlet. The
aspirator regulator gauge should be manually adjusted to achieve ap-
proximately 5 PSI above the process pipe pressure. Other possibilities are
a defective valve or control electronics.
The alarm will clear once the proportional valve is within the limits of
operation or the flow control is put into manual mode.
Flush Pressure [8]
The cell pressure is monitored to detect a possible blockage in the sample
gas path. If gas is unable to flow through the sample cell, the pressure in
the cell will increase becuase there is a restriction in the return path to the
process pipe. A Level 1 alarm occurs if this is the case.
The alarm will clear itself once the cell pressure is reduced. Make sure that
all manual valves in the oven are fully in the open position.
EEPROM Corrupt [9]
All configuration parameters are kept in non-volatile memory. This mem-
ory is known as EEPROM which is an abbreviation for Electrically Eras-
able Programmable Read-Only Memory. If the software detects a problem
with this memory, configuration parameters may be corrupted. This
condition triggers a Level 1 alarm.
This problem will not clear itself. The EEPROM can be reloaded through
the local display. Should this fail, the memory device itself is defective and
the assembly (883047901) must be replaced.
Note that the factory configuration is kept on an AMETEK server.
After reloading the configuration into the EEPROM, recycle power to
clear the error.