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When GRAB SAMPLE is initiated, solenoid 3 is activated and the grab sample solution is
brought into the system. All the other solenoids are de-activated and the recorder
outputs will continue to hold their last measured value obtained during normal
measurement.
To Perform Grab Sample:
Pour the grab sample solution into the grab sample container before initiating
the cycle. Connect the grab sample tubing. Then initiate the GRAB SAMPLE
command by pressing the “GRAB SAMPLE” button on the touch screen from the
Commands Window. Grab Sample results are stored in the Grab Sample Data
Log.
3.4.3.2
CAL 1 Pt
A Single Point (1-Pt) calibration should be performed only if the analyzer has
successfully passed a 2-Pt calibration. For 1-Pt calibration, the first solenoid valve is
energized and CAL1 solution flows through the flow cell. During a 1-Pt calibration the
analyzer calibrates by changing the offset of the slope taken during the last 2-Pt
calibration. NOTE: During single point calibration sample needs to be delivered to
analyzer at flow rate of 150-400ml/min. If not, calibration will result in CF.
Description of 1-Pt Calibration Process:
1.
After CAL is initiated, solenoid valve #3 (Grab Sample) is opened for 2 minutes to
drain any grab sample solution left in bottle.
2.
Solenoid valve #1 (CAL1) is opened for 10 minutes to rinse out system and
update with 100ppb solution.
3.
Solenoid valve #3 is then activated and CAL1 flow is restricted for 3 minutes.
This allows the sodium electrodes to continue measuring standard without using
excess calibration solution.
4.
Solenoid valve #1 is then opened again and CAL1 solution flows through system
for 10 minutes; final millivolt output for CAL1 (m1) reading is taken and stored
into memory.
5.
Calibration is complete. Results are shown on display for 1 minute and then
stored in the Calibration Data Log.
