Free Chlorine - Balancing And Calibration (Free Chlorine Or Redox Electrode); Forced Dosing; Operation - Pahlen MiniMaster User Manual

MiniMaster

Free chlorine - Balancing and calibration (free chlorine or Redox electrode)

It is very important that pH is calibrated and maintained at a stable level. It is a precondition for being able to obtain the right
free chlorine measurement.
At putting into operation a new electrode, let it sit in the fittings for at least 1 hour before calibration begins.
1. Take measured water from the drain tap (F, Fig. 4). Check the pool pH by using photometric measurement instruments.
2. Balance free chlorine value to the required level by dosing chlorine 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 (J) and (K) buttons and hold them down for at least 2 seconds.
5. To confirm that calibration is in progress, LED blinks fast (appr. 5 times/sec) and in the end LED blinks slowly.
6. The unit is now calibrated, and green LED blinks indicating the set measurement value. This value is now stored in the
device memory.
7. Activate automatic mode by pressing (H) button. LED for the current measured value (pH) is now steady, and Mini Master,
if necessary, will control free chlorine value by the connected dosing instruments:

10. Forced dosing

The unit can, if necessary, start a limited dosing.
1. The unit must be in automatic mode (LED's on continuously).
2. Press K button and hold it pressed for at least 5 seconds.
3. Dosing starts and is confirmed by LEDs' circular frequency (LED 1-7) lights for 2 minutes in case of chlorine and redox,
30 seconds in case of pH.
4. To interrupt the dosing cycle, press (H) button until circular frequency stops and LED begins to blink (standby mode).

11. Operation

The pool measured value is displayed with none of the seven colored LEDs on. Green LED (OK) indicates Mini Master's
calibrated set value.
Yellow/red LED shows deviation from
calibrated value according to the table below.
LED → Red (1)
↓ Low
pH < 6.8
Free chlorine < -80%
Flow L/h <10
At high pH-value (LEDs 5–7): Relay R- outlet is activated for dosing acid, pH-lowering chemicals.
At high pH-value (LEDs 1–3): Relay R+ outlet is activated for dosing chlorine.
At using pH-raising agents, it is needed to continuously balance pH-value, see section 14: "Changing the system settings" for
activating relay outlet R+ at low pH (LEDs 1–3).
Most common LED signals*
Two red LEDs blink at an even rate
LED light is steady.
Blinking LED
Circular LEDs 1–7
* See also section 14 "Operation information and troubleshooting, LED signals".
H
1 2 3 4 5 6 7
Yellow Yellow
(2) (3)
Calibration value
6.8-7.0 7.0-7.2
Calibration value
-60% -30%
(rec. 0.5-1.5 ppm)
11-18 18-26
Meaning
For too high or too low flow - dosing shuts off.
Automatic mode: Measuring is in progress, dosing mode is activated.
Standby mode: Measuring is in progress, dosing mode is NOT activated.
Forced dosing is in progress
9
Green (4)
Yellow
(5)
Ok
7.4–7.6
(rec. 7.2-7.4)
+30%
27-52 53-72
ENGLISH
Fig. 10
K
J
Red (7)
Yellow
(6)
High
7.6-7.8 >7.8
+60% >+80%
72-100 >100