SPECIFICATIONS
Embedded microcontroller
Custom one-chip LSI device
Display type
Liquid-crystal with green backlight
Display size
2.05 x 1.5 inches (52 x 38 mm)
Parameters measured
pH, ORP
Measurement range
0 to 14 for pH; -1999 mV
to +1999 mV for ORP
Measurement accuracy
± (0.02 pH units + 2 digits) for pH;
± (0.5% of r 2 digits) for ORP
Measurement resolution
0.01 unit for pH; 1 mV for ORP
Temperature compensation
Automatic between 32 and 150
o
F (0 and 65
o
C)
when using optional ATC temperature probe;
manually settable between 32 and 212
o
F
(0 and 100
o
C) without ATC probe
Storable/recallable readings
Maximum, minimum
Datalogging sampling time
Settable between 1 second and 8 hours,
59 minutes, 59 seconds (in automatic
datalogging mode)
SD card capacity
1 GB to 16 GB
Settable parameters
Date, time, auto power off, beep sound,
sampling time, decimal
point or comma decimal
division, temperature unit, compensation
temperature
Operating temperature
32 to 122
o
F (0 to 50
o
C)
Operating relative humidity
0 to 85%
Power supply
Six Alkaline AA batteries or optional
9-VDC AC adapter
Power consumption
14 mADC (normal operation, with backlight
off and SD card not saving data); 37 mADC
with backlight on and card saving data; 49
mADC with backlight on and card saving data
Dimensions
6.97 x 2.68 x 1.77 inches (177 x 68 x 45 mm)
Weight
1.08 lb (489 g)
MAINTENANCE & TROUBLESHOOTING TIPS
Keep the pH and ORP electrodes and ATC temperature probe clean and protected from the
elements when not in use. When the pH electrode is not being used, General recommends
keeping its head inserted in the bottle of pH buffer solution.
When the icon
appears in the left corner of the display, it’s time to replace the six AA
batteries that power the instrument (although measurements will remain valid for several hours
after the low-battery indicator first appears). Replacing the batteries requires removing the two
screws that hold the battery compartment cover in place, as explained earlier. After inserting
fresh batteries in the correct orientation, tighten the screws to secure the cover.
If the meter “freezes” (like a computer) and buttons become unresponsive, try resetting the
instrument by pushing the RESET button on its right side (callout 1-15 of Fig. 1) with the end of
a paper clip.
Remove the batteries when storing the meter for an extended period of time.
Do not drop or disassemble the meter or immerse it in water.
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