Special Outputs - Hach Sigma 900 User Manual

Section 5
Item
Message
Number
9c AUTO CALIBRATE?
9d TIMED CALIBRATE?
9e READY TO PUMP?
ENTER ACTUAL
9f VOLUME PUMPED,
VOL PUMP = _ _ _ _
TIMED CALIBRATE -
9g
READY TO PUMP?
9h STOP AT MARK
9i TRY AGAIN?
10 SAMPLE TIME LIMIT?
11 LIMIT:_ _ _ _ MIN
12 SPECIAL OUTPUT?

5.13 Special Outputs

Page 46
Special Outputs
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
press the key.
NO
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.
If you press the key, the sampler pump will collect one sample. The pump will first
YES
pre-purge the intake line, draw sample liquid, and then post purge the intake line.
Before pressing the key, disconnect the pump tube from the fitting that leads to the
YES
sample container(s) and direct it into a graduated beaker or cylinder.
Enter the volume (in mL) of sample delivered to the graduated cylinder in item 9e.
Before pressing the key, disconnect the pump tube from the fitting that leads to the
YES
sample container(s) and direct it into a graduated beaker or cylinder.
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 key. The pump will then purge the intake tubing. The sampler will
STOP PUMP
hold the time required to deliver the sample volume in memory. This timed volume is
then repeated for subsequent samples.
If the key was pressed before, or after the desired volume was obtained,
STOP PUMP
pressing the key will initiate another sample cycle. Pressing the
YES
item 10 to appear.
Press the key to terminate sampling after a specified period of time. Item 11 will
YES
appear. Press the key to continue all sampling functions until the last sample has
NO
been delivered.
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.
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
the desired special output (see "Special Outputs") and return the sampler to the
"standby state". Press the
NO
key to initiate the program.
START PROGRAM
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.
Description of Message
key. Item 9d will appear if you
YES
key to return the sampler to the standby state. Press the
key will cause
NO
key to select
YES
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