Instructions for Model SX-620 Pen Type pH Tester

Instructions for Model SX-620 Pen Type pH Tester
Ⅰ .Technical Parameters:
1. Measuring range:pH:-1.00 ~ 15.00 pH; temperature:0 ~ 60.0℃
2. Resolution:pH:0.01 pH;temperature:0.1℃
3. Accuracy:pH:±0.01 pH;temperature:±1℃
4. Temperature compensation range:0 ~ 60℃(automatic)
5. Automatic calibration:1 ~ 3 point calibration(pH4.00/7.00/10.01)
6. Power:CR2032 lithium battery×2,can keep using more than 100 hours.
7. Size and weight:148×29×14mm / 43g
8. Waterproof grade:IP57
Ⅱ . Instructions:
1. Wash the electrode with pure water and dry it, place it into a buffer solution (pH4.00),
still it after stirring, and when the reading is stable, press the key for about 2 seconds,
and release when the icon“
” appears on the LCD, there will display a twinkling
“ 4.00” pH, the calibration will finish after several seconds, and the meter will return
to measuring mode and the icon “
” appears.
2. Wash the electrode with pure water and dry it, then do calibration according to the
above same steps in the pH7.00 and pH10.01 buffer solution. The meter will return to
measuring mode and the icon“
” and “
” appears after calibration.
3. Test:Wash the electrode with pure water and dry it, place it into the sample solution,
still it after stirring, and take the reading after value to be stable.
4. Wash the electrode with pure water and dry it after using, cover the electrode cap,
there must be some soaking solution in the cap, please add some if it is dry.
Ⅲ . Considerations:
1. The meter can arbitrarily adopt 1 point, 2 points and 3 points automatic calibration. It
can adopt 1 point calibration for accuracy ≤ 0.1pH; For the measurement value only
within the acidity or alkalinity range, it can adopt 2 points calibration. If choose the 3
points calibration, the accuracy will be higher in the whole measuring range. For the
new electrode which be used for the first time, it must adopt 3 points calibration.
2. For high accuracy measurement(≤ ±0.03pH),should do calibration in time;for the
general accuracy measurement(≤ ±0.1pH),it can keep using for one week or longer
after calibration.
3. In order to ensure the meter’s reliability, the buffer solution must be reliable, and should
change it immediately after using for many times.
4. The electrode head will be stained after many times using, please pay attention to
wash and maintain. The method is: wash the bulb and the junction with a small oil paint
brush with soap water, then wash it with pure water and place it into soaking solution
for 24 hours before using.
5. pH electrode using period is about 1 year, when the icon “
” appears on the
LCD, or the accuracy and respond speed can not meet your demand, please change
a new electrode. The method is: take off the electrode upper cover and the circuit
connector of meter, and insert it into a new pH electrode, the electrode model is SX625
pH combination electrode.
6. The meter will automatically power off if no operation after 10 minutes.
7. Please change the battery when the icon “
” appears on the LCD.
8. The switch for the temperature unit between and : when turn off, depress the key
for more than 3 seconds and release to change the temperature unit.
For the above instructions, please refer to the schematic on the back of the meter.
SX-620 Version2.0 08/06