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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
Page 57
EARLY Mode Clock Resets:
Minute 55 to 60:
The external reset signal changes the clock back to minute 55:00 of the current hour. A new
measurement cycle will start at that moment. If a cycle has already started, it will continue. No error
occurs since there is adequate time to complete the cycle.
Minute 0 to 50:
The external reset signal has no effect. The error log will contain the date and time of the reset
attempt.
Minute 50 to 55:
If an external reset occurs after a completed cycle (idle condition), then no error occurs. The clock
will be set forward to minute 55:00 of the current hour and a new measurement cycle will start.
8.3
Telemetry and Error Relays
In addition to the analog output, input and output relay connections are provided on rear panel of the APDA-371 to allow
the unit to be used with an external data logger in a synchronous mode of operation. The function of each input and
output is described below. Many of the relay outputs described below are related to APDA-371 error conditions
described in section 6.5.
Note: A contact-closure input to the APDA-371 is achieved by shorting the two terminals on that particular input
together, usually with a relay on the external datalogger. The datalogger should not apply any voltage or current to the
terminals. Contact-closure outputs from the APDA-371 are provided by the unit shorting the two terminals together
with an internal relay, without applying any voltage or current to them. The external datalogger must then sense the
closure. Normally-Open means that the relay contacts are not shorted together unless a certain condition occurs, while
Normally-Closed means that the relay contacts are shorted until the condition occurs, then they open.