Ametek 682T-HP, User Manual

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Chapter 7: Alarms & I/O Configuration, Page 87
M o d e l 6 8 2 T - H P U S E R M A N U A L A T E X Z o n e 2
If nothing seems obvious, try a power reset. If this does not help, contact
AMETEK’s service department for assistance.
7.1.4 Purge Alarm
If the purge controller senses a loss of positive pressure in the cabinet, the
general alarm will be set. In addition, a digital output is available to indicate a
purge pressure alarm for remote monitoring.
Check the door for loose clamps. Check the cabinet for obvious leaks. If the
purge system does not indicate the same failure, check the signal from the purge
alarm to the analyzer.
7.1.5 Low Density (Warning)
A low density reading is a Warning and not an Alarm condition. Low density
reading will turn off X-rays to prevent saturation of the detector when nothing is
in the Flow Cell to absorb some of the X-rays. Make sure that it is safe to open
the cabinet, then check the densitometer for operation. If a remote density
display is included, verify that the output matches the Touch Panel display.
Verify that there is fluid in the Densitometer. The Warning will be cleared
automatically when the density is above the minimum. Check connections and
try cycling power. If nothing seems obvious, contact AMETEK’s service
department for assistance.
7.1.6 I/O Error
If the Touch Panel Display shows #### symbols instead of number values in the
expected fields, the connection to the PLC is probably loose or connected to the
wrong port. Make sure the cable from the Touch Panel Display is connected to
the correct port of the PLC. Check for any loose connections and try cycling
power. If this fails, you may need to reload the software. Contact the AMETEK
service department for assistance.
7.2 Inputs and Outputs
Various inputs and outputs are available to enable remote operation of the analyzer.
These inputs and outputs are all easily connected at Terminal Block 3 (refer to
schematics for TB3 in section
8.1 Specifications ). At a minimum, the General Alarm and
the Purge Pressure Alarm should be connected to an automatic external monitoring
system. If external monitoring is not desired, the analyzer continues to have full function
with local control.
7.2.1 Analog Outputs
% S – Proportional Result
g/cc Density – Proportional Result
One 4-20mA output signal is provided that is proportional to the result of the
sulfur measurement at the end of every analysis. A second 4-20mA output
signal is provided that is proportional to the density of the fluid in the analyzer.