Operation Manual HORIBA APDA-371
Particulate Monitor
Date:
April, 2010
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HORIBA Europe GmbH, Julius-Kronenberg-Str. 9, D-42799 Leichlingen, Telefon: +49(0)2175-8978-0, Fax: +49(0)2175-8978-50
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e2
Not Used.
e3
Membrane OFF Delay. Hysteresis timer, range is 0.000 to 5.000 seconds. Don’t change this value unless
instructed to do so by HORIBA.
e4
Membrane Time Out. The time the unit allows for the membrane assembly to move before generating an error.
Range is 10.00 to 20.00 seconds. Don’t change this value unless instructed to do so by HORIBA.
6.5
ERRORS Screen
This screen allows the operator the option of reporting APDA-371 errors with the analog output signal. This type of error
indication is used when the operator is limited to a single voltage channel for particulate information, such as when the
APDA is connected to certain types of data loggers. In this case, the APDA sets the analog output to full scale voltage
(usually 1.000 volts) when an error occurs. At the beginning of the next hour, the errors are reset and the output
functions normally unless another error occurs. The operator can select which errors, if any, are reported in this
manner, by selecting each error from the list below and enabling or disabling it (1=ON, 0=OFF) in the error setup
screen.
Regardless if a particular error is enabled for the analog output in this manner or not, it will always be reported in the
APDA-371 digital memory, and may be viewed with the display or by downloading the data through the serial port.
Some of these errors such as P, R, N, and E may be set to cause the analog output to go full scale, even though there
may be nothing wrong with that hour’s data. In this case, the concentration data can still be downloaded from the
APDA. Some (but not all) errors such as M and L cause the digital concentration value to be set to full scale too, usually
.985mg.
This scheme is used because it is rare for an actual valid concentration reading to measure full-scale. However,
concentrations at or near zero can be common, so leaving the data value at 0.000 during an alarm could be mistaken
for valid data.
SETUP MODE ERROR
EUMILRNFPDCT AP FRI FRh
111111111111 150 10 20
1=ON, 0=OFF
SAVE
EXIT
The ERRORS Screen
E
EXTERNAL RESET:
This error indicates that the system clock time was unable to reset when signaled by an
external datalogger. If external reset is successful then no error is logged (see Section 8.2). Sometimes called
INTERFACE RESET.
U
TELEMETRY FAULT: This error indicates that an external datalogger has sent an error to the APDA-371 (on
the TELEM FAULT input) indicating that it has encountered a problem. Check the datalogger.
M
MAINTENANCE:
This is a user-set data flag which indicates that calibration or testing was performed
during the flagged hour. The “M” flag may also be forced ON in the SETUP > INTERFACE menu by setting “Force
Maint” to ON, or in the OPERATE > INST screen by pressing the TOGGLE FLG button. M flags cause the digital
concentration to read full-scale for that hour.
I
INTERNAL CPU:
This indicates an error in the mass concentration calculation by the central processor.
Contact the Service department if these errors begin to occur frequently.
L
POWER FAIL: This error occurs any time power is cycled or lost, even momentarily. Frequent “L” errors
usually indicate poor quality AC power. In some cases these errors can be generated by electrical interference (such as
large radio antennas or motors) causing an internal reset in the APDA-371. There are also a variety of power supply
upgrades available for some older APDAs which experience frequent L errors. If a APDA experiences frequent L
