Operating Instructions
ORPTestr
®
50 Pocket Tester
Temp Set
Backlight
Reset
hold
Backlight
ON
OFF
hold
Backlight
OFF
hold
menu
Backlight
Reset
Temp Cal
hold
°C
°F
menu
°C
hold
Temp Set
Set °C/°F
hold
Getting Started
The ORPTestr 50 Pocket Tester has been factory calibrated and usually works
well out of the box. However, after extended periods of non-use, it is best to
remove the sensor cap and soak the sensor in warm tap water or ORP buffer
for 10 minutes or so. A brief rinse with deionized (DI) water is OK, but avoid
soaking or storing in deionized water as this will shorten ORP electrode life.
Prior to taking the measurements, periodic calibration with certified standards
is recommended for best accuracy.
Temperature Settings
1. Press ON/OFF ( ) to power on if needed.
2. Press MENU/
v
to enter setup window. Press HOLD/
to select Temp Set.
The display shows Set °C/°F and Temp Cal.
3. Press HOLD/
to select Set °C/°F. Display automatically shows °C and °F.
4. Scroll down by pressing MENU/
v
to toggle between °C and °F.
5. Press HOLD/
to select a temperature unit. The display shows the selected
temperature setting with a .
Temp Set
Settings
Factory Reset
hold
No
Yes
menu
hold
User Reset
Reset
hold
•
Aquaculture
• Aquariums
• Boilers
• Car washes
• Ecology
Applications
• Food sectors
• Hydroponics
• Labs
• Sanitation plants
• Steam generators
• Spas
• Studies
• Water and wastewater
treatment
• Water quality testing
in pools and more
Backlight Settings
1. Press ON/OFF ( ) to power on if needed.
2. Press MENU/
v
to enter setup window. Scroll down by pressing
MENU/
v
to select Backlight. Press HOLD/
to select Settings. The
display shows Backlight.
3. Press HOLD/
to select Backlight. The display shows ON and OFF.
4. Scroll down by pressing MENU/
v
to toggle between ON and OFF.
Backlight ON increases readability in low-light conditions.
5. Press HOLD/
to select the desired backlight option. The display
shows the selected backlight option with a .
CAL
189
189
mV
CAL
Place the tester in
the buffer to
start or press
to escape.
cal
esc
cal
esc
CAL
844
25.0°C
RmV
ORP Measurement
1. Press ON/OFF ( ) to power on if needed.
2. Dip the electrode about 2 cm to 3 cm into the test solution. Stir and let the
reading stabilize. The timer icon blinks during this time. Once the reading is
stabilized, the timer stops blinking and will appear to indicate the stability
of the reading.
CAUTION: Testing dry samples is not accurate and can
lead to sensor damage or breakage. Soils must be wet
and free of particulates that may scratch the glass
sensor. Excessive force into dry samples can cause
glass breakage.
3. Note the ORP value or press HOLD/
to freeze the reading. To release the
reading, press HOLD/
again.
4. Press ON/OFF ( ) for 3 seconds to turn off tester. If a key is not pressed for
8.5 minutes, the tester will automatically shut off to conserve batteries.
ORP
844
25.0°C
RmV
ORP Calibration
Calibration should be done regularly, preferred once in a week. ORP tester
allows one point calibration.
1. Press ON/OFF ( ) to power on if needed.
2. Dip electrode in about 2 cm to 3 cm into the calibration standard solution.
3. Press the CAL/ESC key to enter calibration mode. The CAL indicator will be
displayed.
4. Allow the reading to stabilize. The timer icon blinks during the reading
stabilization. Once the reading stabilized the timer stops blinking.
5. Upper display shows current measured value based on the factory default.
6. Lower display shows current measured mV with last calibration (if no
calibration is performed earlier both display shows the same measurement
value).
7. Press MENU/
v
to adjust the mV value to match the calibration standard
value.
8. Press HOLD/
to confirm the calibration or press CAL/ESC key to exit the
calibration without confirmation.
User Reset
Reset the ORP calibration to the default using the user reset function.
1. Press MENU/
v
to enter setup window. Scroll down by pressing MENU/
v
to select Reset. Press HOLD/
to select Reset. The display shows User
Reset and Factory Reset.
2. Press HOLD/
to select User Reset. The display automatically shows
No
and
Yes.
3. Scroll down by pressing MENU/
v
to toggle between No
and
Yes
.
4. Press HOLD/
to confirm either No or Yes. The display shows the user
reset option with a .
Factory Reset
Reset the tester to the factory default using the factory reset function.
1. Press MENU/
v
to enter setup window. Scroll down by pressing the
MENU/
v
to select Reset. Press HOLD/
to select Reset. The display shows
User Reset and Factory Reset.
2. Scroll down by pressing the MENU/
v
to toggle between the resets.
Press HOLD/
to select Factory Reset. The display automatically shows
No and Yes.
3. Scroll down by pressing MENU/
v
to toggle between No and Yes.
4. Press HOLD/
to confirm either No or Yes. The display shows the factory
reset option with a .
Temp Set
Settings
User Reset
hold
No
Yes
menu
hold
Reset
Factory Reset
hold
Manual Temperature Setting
The MTS range is 0°C to 60.0°C (32.0°F to 140.0°F). User reset will set
temperature to default value 25°C or 77°F.
1. Press MENU/
v
to select setup window. Scroll down by pressing MENU/
v
to select Temp Set. Press HOLD/
to select Temp Set. The display shows
Set °C/°F and Temp Cal.
2. Scroll down by pressing MENU/
v
to toggle between Set °C/°F and
Temp Cal. Press HOLD/
to select Temp Cal.
3. The lower display shows the current measured temperature reading based
on the last set offset and the upper display shows the current measured
temperature reading based on factory default calibration.
4. Dip the tester into a solution of known temperature and allow time for the
built-in temperature sensor to stabilize.
5. Press MENU/
v
to adjust the temperature value or press the HOLD/
to
confirm the calibrated value as new temperature value of the solution.
Note: To exit without confirming the calibration, press CAL/ESC.
Backlight
Reset
hold
Temp Cal
23.4°C
23.4°C
menu
23.4°C
hold
Temp Set
Set °C/°F
Temp Cal
hold
Key Info
Scroll
Accept
EXIT
MENU
HOLD
CAL
Key Info
Scroll
Accept
EXIT
MENU
HOLD
CAL
Key Info
Scroll
Accept
EXIT
MENU
HOLD
CAL
Key Info
Scroll
Accept
EXIT
MENU
HOLD
CAL
Key Info
Scroll
Accept
EXIT
MENU
HOLD
CAL
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