Hach-Lange SD900 User Manual - Manual (Page 33)

Send output signal with sample cycle (special output)
The special output option sends a 12 VDC signal through pin E of the auxiliary connector during or
after a sample cycle.
There are five possible configurations:
• After cycle—4-second pulse at the end of each sample cycle. This option is used to signal an
external device that a sample cycle is complete.
• Entire cycle—during the entire sample cycle, includes all purge and rinse cycles.
• During sample—during the sample intake portion of the cycle only, ignores all purges and rinse
cycles.
• Missed sample—4-second pulse in the event of a missed sample. A missed sample can be
caused by a distributor error, purge fail, rinse fail, sample timeout, full bottle or pump fault.
• Trouble output—4-second pulse when a low main battery or low memory battery error occurs.
Two configurations are necessary to transfer sample history to an external flow meter:
• First, the program complete output needs to be disabled to enable the bottle number output. The
bottle number output transmits whether the sample was taken successfully or not and which bottle
received the sample.
• Second, the special output needs to be enabled and configured to assert "After Each Sample".
The sample history will be transferred to the external Sigma 950.
1. Select PROGRAM SETUP>MODIFY SELECTED>ADV SAMPLING from the main menu.
2. Select SPECIAL OUTPUT>ENABLE.
3. Select one of the output options:
• AFTER CYCLE—at the completion of each sample cycle
• ENTIRE CYCLE—during the entire sample cycle
• DURING SAMPLE—during the sample intake
• MISSED SAMPLE—in the event of a missed sample
• TROUBLE OUTPUT—when a low main battery or low memory battery error occurs
Operate from an external signal (setpoint sample)
The setpoint sample option starts and stops the sampler after a signal is received from an external
device such as a flow meter. The current program status shows when the sample program is
inhibited by an external device.
Note: Setpoint and stormwater sampling cannot be enabled at the same time.
1. Select PROGRAM SETUP>MODIFY SELECTED>ADV SAMPLING from the main menu.
2. Select SETPT SAMPLE>SETPT TRIGGER>EXT TRIGGER >ENABLE.
3. Select SETPT SAMPLE>SETPT CONTROL and select one of the setpoint options:
Option Description
START ON SETPT The sampling program operates until the program is complete.
START/STOP The sampling program operates until the external signal is no longer received.
4. To use a setpoint delay, enter a delay time in hours and/or minutes. The delay time starts when
the external signal is received. The program starts when the delay time expires.
Use an SDI-12 device for setpoint sampling
When an SDI-12 device is connected to the controller, the measurements can be used as setpoint
sampling triggers (in addition to the external inhibit). A maximum of one measurement trigger can be
enabled that is independent of the external trigger. If multiple triggers are enabled, the program starts
from at least one trigger and stops when all triggers are cleared.
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