Calibration; Ph Value - Balancing And Calibration (Ph Electrode) - Pahlen MiniMaster User Manual

MiniMaster

9. Calibration

Observe recommended water values (section 3 "Water chemistry") if you want to create conditions for the optimal measurement
and control.
pH-unit can be calibrated against buffer solution pH 7.3, pH-value can be measured by photometric measuring instruments.
Fig. 8. Calibration
H
Calibration = fast blinking green LED

pH value - Balancing and calibration (pH electrode)

Calibration with buffer solution pH 7.3:
1. Turn off measured water. Release bracket (E) and fold out the modules. Loosen the electrode BNC connector from the
controller (see Fig. 5) before pH electrode is unscrewed from the module. Connect BNC connector back to the controller.
2. Tap as much buffer solution into measuring cylinder, so that it covers at least 2 cm of electrode end. Let it stay for at least
30 seconds. NOTE! Use buffer solution as recommended, and it can not be reused.
3. Calibrate pH unit by simultaneously pressing (J) and (K) buttons and hold them down for at least 2 seconds.
To confirm that calibration is in progress, LED blinks fast (appr. 5 times/sec) and in the end LED blinks slowly.
4. The unit is now calibrated - green LED blinks indicating set measurement value. This value is stored in the device memory.
5. Put back the electrode into Mini Master module by loosening BNC connector, screwing the electrode into the module and
then connecting BNC connector again.
6. Open measured water taps and check the flow.
7. Activate automatic mode by pressing (H) button. LED current measured value (pH) is now steady, and Mini Master,
if necessary, will control pH dosage:
- If current value is HIGHER THAN THE SET POINT, LED lights to the right of OK, Mini Master signals to the connected
dosing equipment to adjust pH in the pool.
- If the current value is LOWER THAN THE SET POINT, LED lights to the left of OK. pH value needs to be balanced
manually in the pool with pH-raising agents.
8. Concentrated dosing can initially cause big swings in the measured values (depending on the pool size and turnover rate).
Let fluctuations subside and carefully check that pH is stabilized after appr. 5 hours.
9. Take measured water from the drain tap (F, Fig. 4) and check pH with photometric measurement instruments.
Calibrating with photometric reference measurement instruments:
1. Take measured water from the drain tap (F, Fig. 4). Check the pool's pH by using photometric measurement instruments.
2. Balance pH to 7.2-7.4 by dosing acid (at high pH) or base (at low pH ) manually, by putting agents directly into the pool.
3. Concentrated dosing can initially cause big swings in the measured values (depending on the pool size and turnover rate).
Let fluctuations subside and carefully check that pH is stabilized after appr. 5 hours.
4. Calibrate pH unit by simultaneously pressing (I) and (J) buttons and holding them down for at least 2 seconds.
To confirm that calibration is in progress, LED blinks fast (appr. 5 times/sec) and in the end LED blinks slowly.
5. The unit is now calibrated, and green LED blinks indicating the set measurement value. This value is stored in the device
memory.
6. Activate automatic mode by pressing (H) button. LED for current measured value (pH) is now steady and Mini Master
controls the signal to the connected dosing equipment to regulate pH in the pool.
Fig. 9. Automatic mode
K
H
J
Automatic mode = steady LED light
8
ENGLISH
K
J