For best performance, the pH/ORP Meter should be cali-
brated regularly using buffers that bracket the expected
pH range of the sample.
For example, if your sample will typically be in the pH 7.2
– pH 8.2 range, use the pH 7 and pH 10 (or pH 6.86 and
pH 9.18) buffers to calibrate. For a full range calibration
use 3 standard Buffers to calibrate the pH/ORP Meter.
If you calibrate with more than 1 pH Buffer, the pH/ORP
Meter will develop a slope and offset calibration curve.
If you only use 1 buffer to calibrate, the pH/ORP Meter
will just adjust the electrode offset, and use an ideal
slope curve (~59 mV/decade). A 1-point calibration is less
accurate, especially for older electrodes that may have
developed an offset over time.
You can use the buffers in any order, but make sure you
use the buffers that were selected in the Auto recognized
buffer set in the setup mode (see section B1). If possible,
the buffers should be at the same or similar temperature
as the samples you will be measuring. For example, if you
are regularly measuring the pH of warm pool water, try to
warm your buffers to a similar temperature before using
them for calibration.
To calibrate the pH/ORP Meter, press the Cal Key for 2
seconds:
The CAL mode icon will flash and a 1 will indicate it is
looking for the first buffer (Buffer 7.00 or the M, in this
example). Put the electrode into the first buffer and press
the Cal Key. An hourglass icon will appear while the pH/
ORP Meter calibrates to this buffer value
:
When it is stabilized, the hourglass icon will disappear
and the CAL and 2 icons will flash. You can either:
Exit the cal mode
by pressing the Store/Backlight Key
and accept a 1-point calibration.
Or (for a multipoint calibration)
Rinse the electrode, dry it and immerse it in the sec-
ond buffer
wait until the hourglass disappears then press
the Cal Key to do a 2-point or 3-point calibration.
When it is stabilized, the hourglass icon will disappear
and the CAL and 3 icons will flash. You can either:
Exit the cal mode
by pressing the Store/Backlight Key
and accept a 2-point calibration.
Or (for a 3-point calibration)
Rinse the electrode
, dry it and immerse it in the third
buffer , wait until the hourglass disappears then press the
Cal Key to do a 3-point calibration.
After the 3-point calibration, the pH/ORP Meter will return
to measurement mode.
The pH/ORP Meter can now be used to accurately
measure the pH or ORP in the sample.
J. Taking Measurements with the pH/ORP Meter
1. To measure the pH or ORP in your sample, the pH/
ORP Meter needs to be in Measurement Mode. This
is the default start-up mode when the pH/ORP Meter
is turned on and is indicated by a “pH” or “ORP” icon
above and to left of measurement value.
2.
Confirm that the electrode has been properly stored in
storage solution (see “Preparing the pH/ORP Meter”).
Rinse any storage solution off the electrode and blot
dry.
3. Immerse the electrode at least one inch into the
sample to ensure the sensor and reference junction
are surrounded by the sample.
4. When the reading stabilizes (the hour glass will
disappear) you can lock, record or store the value (see
sections C and F)
5. Rinse and blot dry the electrode between samples to
ensure no carryover effect from sample to sample.
Error Codes and Troubleshooting
Error Code and Actions
#
Description Range
Actions
1
Electrode
not installed
or bad
Thermistor:
0.5k~100k Ω
Install or replace
electrode
2
pH out of
range
0~14pH
Use other solution
or recalibrate or
replace electrode
3
Temperature
out of range 0~60°C
Bring solution to
the temperature
within range
4
Offset out of
range
–60~60mV
Use new buffer or
replace electrode
5
Slope out of
range
85%~115%,
50~68 (mV/
pH)
Use new buffer or
replace electrode
6
ORP out of
range
–1800 to
1800mV
May need to
check a solution
of a known value
within the range
TRACEABLE
pH/ORP METER
INSTRUCTIONS
®
Control Company Cat. No. 4277
Traceable
®
is a registered trademark of
Control Company.
©2016
Control Company. 92-4277-00 Rev. 1 062316
www.
GlobalTestSupply
.com
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