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pH Measurement 

4.1 

Power on and remove the probe cap. 

4.2 

Rinse the probe with clean water and shake off excess water. 

4.3 

Fully submerge the probe into the solution at least 1 inch deep, 

make a quick stir to remove potential air bubbles around the 

probe. 

4.4 

Hold the pen and wait for the reading to stabilize (

 stays on 

screen), then record the reading. 

4.5 

Thoroughly rinse off the probe with clean water, then close the 

probe cap. 

EC Calibration 

5.1 

Power on and remove the probe cap. Press 

 to switch to EC 

measurement mode. Rinse the probe with clean water and 

shake-dry, then submerge it in the 2.77 EC standard solution; 

shake the probe in the solution up and down for a few seconds 

to remove potential air bubbles, then let it stand. 

5.2 

Hold 

 until screen turns green. The pen starts automatic 

calibration. Wait for "Good" to show up (in 10-15 seconds), 

indicating the calibration is completed, then the pen returns to measurement mode. 

 

Short press any key while calibrating (in green screen) to cancel calibration and return to 

measurement. 

 

5.3 

 icon will show up on the lower left corner indicating the tester 

is successfully calibrated. 

 will disappear in 30 days after 

calibration, reminding you to re-calibrate EC. We recommend 

calibrating the EC once every month to ensure the accuracy.  If 

you feel like the accuracy might be off, simply test the standard 

solution (make sure the standard is fresh and clean). If the reading is greater than 2.8 

EC or smaller than 2.7 EC, then it’s time to calibrate again. 

 

5.4 

If the calibration fails, the screen will turn red. For details, see 

Section 13 Troubleshooting Guide.  

 

 

Содержание 28APE190352/AI21040

Страница 1: ...GroStar GS4 Premium pH EC Pen Tester User Manual APERA INSTRUMENTS Europe GmbH www aperainst de...

Страница 2: ...ically for the horticultural market Since 1991 Apera instruments has been dedicated to providing hi tech accurate lab grade instruments and sensors GroStar s intelligent design reduces the guesswork s...

Страница 3: ...which you should pour the soaking solution or sample solution For details of probe storage see Section 9 Premium pH EC Combo Probe Upgraded double junction blue pH sensor increased durability and eas...

Страница 4: ...KCL soaking solution for 5 minutes before use 2 5 If the tester hasn t been used for a long time over 1 month please soak the probe in the 3M KCL soaking solution for at least 1 hour then calibrate i...

Страница 5: ...up to the right of Calibrating pH 10 is usually not necessary unless your estimated target pH is greater than 8 0 pH 3 5 will disappear in 30 days after calibration reminding you to recalibrate the te...

Страница 6: ...ential air bubbles then let it stand 5 2 Hold until screen turns green The pen starts automatic calibration Wait for Good to show up in 10 15 seconds indicating the calibration is completed then the p...

Страница 7: ...of very high levels as delicate plants cuttings and seedlings can experience fertilizer burn if the conductivity is excessively high EC 500ppm and 700ppm are simply different units preferred by differ...

Страница 8: ...in 9 Probe Storage 9 1 Under regular usage daily or weekly use make sure there are several drops 3M KCL soaking solution in the probe cap and tightly close the cap with the O ring 9 2 For long term st...

Страница 9: ...ver Every probe will eventually age and fail even if you don t use it that often The typical service life of GroStar probes is 18 24 months depending on the frequency of usage and how well you keep it...

Страница 10: ...s cleaning solution or detergent water Clogged junction Clean the probe with Apera s cleaning solution then soak it in 3M KCL soaking solution overnight Aged probe Replace the probe Testing pH of low...

Страница 11: ...of operation Backlight White measurement Green calibration Red errors Reading hold Manual Calibration is successful but reading is not accurate Aged probe Replace the probe Air bubbles around the sens...

Страница 12: ...terproof rating IP67 Reading stabilization icon 15 What s in the box 16 Accessories pH buffer Kit pH4 7 250ml each item AI1113 pH buffer Kit pH4 7 10 250ml each item AI1115 2 77 EC Standard Calibratio...

Страница 13: ...his warranty does not apply to replacement of items subject to normal use wear and tear and expressly excludes Cosmetic damage such as stains scratches and dents Damage due to accident improper use ne...

Страница 14: ...ES DO NOT ALLOW EXCLUSION OR LIMITATION FOR INCIDENTIAL OR CONSEQUENTIAL DAMAGES OR LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT BE APPLICABLE IF ANY P...

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