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10 

 

 

Out of range reminder for: 

 

pH 

temperature 

EC 

 

 

 

 

14  Technical Specs 

Range 

0.0 to 14.0 pH, 

0 to 10.0 EC, 

0 to 7000ppm (700ppm), 
0 to 5000ppm (500ppm), 

0 to 50˚C (32 to 122˚F)

 

Resolution 

0.1 pH, 0.1EC, 10ppm (700ppm), 10ppm(500ppm), 

0.1˚F/0.1˚C

 

Accuracy 

±0.1 pH, 

±0.1 EC 

±30ppm (500ppm) 
±40ppm (700ppm) 

±1˚C/±1˚F

 

Temperature compensation 

Automatic 

Calibration 

pH: automatic 1 to 3 points (7/4/10) *10.01 pH solution sold 

separately; EC: automatic 1 point (2.77 EC) 

Unit 

pH, EC, 500ppm, 700ppm, ˚F, ˚C

 

Power Supply 

4-AAA alkaline batteries, up to 1000 hours 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 

sensor

 

Make a quick stir in the solution to remove air bubbles.

 

Clogged junction

 

Clean the probe with cleaning solution, then soak it in 

3M KCL soaking solution overnight

 

Comparison with other 

testers, test strips, or 

drop tests

 

To compare with other testers, make sure to perform a 

2-point calibration for all testers in the same standards, 

then test a 3rd point. Whichever gives more accurate 

reading in the 3rd point standard is the most accurate 

one.

 

Test strips or drop 

tests’ accuracy is not 

comparable to pH 

meters’.

 

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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