Hach SIGMA 900, Руководство пользователя

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Page 46
Special Outputs
8837prg.fm
Section 5
5.13 Special Outputs
Pins E and B in the 6-pin auxiliary receptacle located on the left side of the
controller allows access to several special outputs:
Mode 1 (Sample Output)
A 12 V dc (500 mA maximum) output occurs only when the peristaltic pump is
taking a sample (12 V dc is not present during the pre-purge and post-purge
cycles). This output may be used to pace a remote totalizer for tracking of the
number of samples taken.
Mode 2 (Event Output)
A continuous 12 V dc output occurs during the pre-purge, sample, and
post-purge cycles (and rinse cycles, if enabled). This may be used to control
an actuated valve when sampling from a pressurized (less than 10 psig) line.
9c AUTO CALIBRATE?
There are two sample volume calibration methods, “Auto Calibrate” and “Timed
Calibrate”. The Auto Calibrate method uses the liquid sensor to determine sample
volume and can only be used if the sampler is located above the sample source. The
intake tubing must slope downward from the sampler to the source and should be free
of any loops. Item 9e will appear if you press the
YES
key. Item 9d will appear if you
press the
NO
key.
9d TIMED CALIBRATE?
Perform a timed calibration of the sample volume when site conditions do not permit
the sampler to locate above the sample source, and when intake line lengths exceed
99 feet. The timed calibration mode disables the liquid sensor, prerinse, and intake
fault.
9e READY TO PUMP?
If you press the
YES
key, the sampler pump will collect one sample. The pump will first
pre-purge the intake line, draw sample liquid, and then post purge the intake line.
Before pressing the
YES
key, disconnect the pump tube from the fitting that leads to the
sample container(s) and direct it into a graduated beaker or cylinder.
9f
ENTER ACTUAL
VOLUME PUMPED,
VOL PUMP = _ _ _ _
Enter the volume (in mL) of sample delivered to the graduated cylinder in item 9e.
9g
TIMED CALIBRATE -
READY TO PUMP?
Before pressing the
YES
key, disconnect the pump tube from the fitting that leads to the
sample container(s) and direct it into a graduated beaker or cylinder.
9h STOP AT MARK
In response to item 9g, the pump will pre-purge the intake line and begin pumping
liquid into the graduated container. When the desired volume has been delivered,
press the
STOP PUMP
key. The pump will then purge the intake tubing. The sampler will
hold the time required to deliver the sample volume in memory. This timed volume is
then repeated for subsequent samples.
9i TRY AGAIN?
If the
STOP PUMP
key was pressed before, or after the desired volume was obtained,
pressing the
YES
key will initiate another sample cycle. Pressing the
NO
key will cause
item 10 to appear.
10 SAMPLE TIME LIMIT?
Press the
YES
key to terminate sampling after a specified period of time. Item 11 will
appear. Press the
NO
key to continue all sampling functions until the last sample has
been delivered.
11 LIMIT:_ _ _ _ MIN
Select the time limit for the entire sampling program. The program time limit includes
the first flush interval. The sampling program begins with the first sample collection
(including the first flush interval) and ends after the time limit lapses.
12 SPECIAL OUTPUT?
All 900 samplers can provide an output voltage on pins E and B in the 6-pin auxiliary
receptacle located on the left side of the control housing. Press the
YES
key to select
the desired special output (see “Special Outputs”) and return the sampler to the
“standby state”. Press the
NO
key to return the sampler to the standby state. Press the
START PROGRAM
key to initiate the program.
Item
Number
Message Description of Message