Operating Manual
ORPTestr
®
30 Pocket Tester
Keypad Functions
Short press
= <2 seconds
Long press
= >2 seconds
1. Short press to turn on the tester and long press to turn
off the tester.
2. When turned off, long press to enter parameter setting
mode.
3. In measurement mode, short press to turn on backlight.
1. In calibration mode, short press to change calibration
value (unidirectional).
2. In mode setting, short press to change parameter
(unidirectional).
1. Long press to enter calibration mode.
2. In calibration mode, short press to confirm calibration.
3. When measured value is locked (HOLD icon), short
press to unlock.
CAL
<
MEAS
Thank you for purchasing the Oakton
®
ORPTestr
®
30 Pocket Tester.
Please carefully read this operating manual before using the
product to obtain an accurate and reliable test result and avoid
unnecessary damage to the tester or probe.
Features
• Large easy-to-read LCD with 3-color backlight
• Replaceable double-junction sensor saves you money
• Stability and battery status icons
• Auto power-off function conserves battery life
• IP67 waterproof rating
Preparation Before Use
1. Pour certain amount of storage solution (KCl) into the probe cap,
soak the probe for 3 to 5 minutes to activate the sensor (if frequently
used, there is no need to soak).
2. The soaking solution is 3M KCl solution; preferably Oakton
Electrode Storage Solution (SKU 00653-04). Users can also
make it themselves by dissolving 25 g KCl in 100 ml of distilled
water.
ORP Calibration
1. Clean electrode in distilled water and dry it.
2. Pour a small amount of 222 mV ORP
standard solution (SKU 80055-90, 500-mL
bottle) into the calibration bottle.
3. Short press /MEAS key to turn the meter
on. Long press CAL/ key to enter calibration
mode. If you need to exit calibration mode,
short press /MEAS key.
4. Dip electrode in the ORP standard solution
(Zobell’s solution), stir gently, and allow it to
stand still in the calibration solution until a
stable reading is reached. When measurement stability icon ( )
appears and remains on the screen (see Fig. 1), press MODE/
△
key to
adjust the calibration value according to the table below (also on the
buffer bottle’s label).
Temperature (ºC)
10
15
20
25
Temperature (ºC)
30
35
38
40
mV
215
209
205
201
mV
242
235
227
222
For example, if the temperature is around 25ºC, then adjust the
calibration value to 222 mV. If the temperature is around 20ºC, then
adjust the calibration value to 227 mV. Short press CAL/ key to
complete the calibration.
ORP Measurement
Press /MEAS key to power on, clean the probe in distilled water,
and gently dry it. Place the probe in the tested solution and stir
gently and let it stand still. Read the measurement after the stability
icon ( ) appears and remains on.
Notes
Usually there’s no need to calibrate for ORP testing. When not used
for a long time, users can test the unit in 222 mV ORP standard
buffer. If the error is large, recalibrate according to the steps above.
Cleaning and Activating the ORP Probes
After long-time use, the surface of the platinum sensor can be
contaminated and cause inaccuracy and slow response time. If that
happens, the followed methods can be adopted to clean and
activate:
A. For contamination caused by inorganic substances, dip the
probe into 0.1 mol/L dilute hydrochloric acid for 30 minutes.
Clean it with distilled water, soak in KCL storage solution (SKU
00653-04) for 6 hours, and then it will be ready for use.
B. For contamination caused by organic substances and oiliness,
clean the platinum surface with dishwashing liquid and wash
with distilled water. Soak for 6 hours in storage solution (SKU
00653-04) and then it will be ready for use.
C. If the platinum surface is so severely contaminated that an
oxide film forms, use toothpaste to clean the platinum surface,
and then wash it with distilled water. The probe will be ready for
use again after 6 hours of soaking in the storage solution (SKU
00653-04).
Setting the Parameters
When tester is off, long press /MEAS key to enter parameter
settingmode. Short press MODE/
△
key to switch from P1 to
P2…P6. Short press CAL/ key and parameter will flash, then short
press MODE/
△
key to choose desired parameter. Short press
CAL/ key to confirm selection. Long press /MEAS key to exit
parameter setting mode.
ORP Standard Buffer Solution Calibration Reference Table
Symbol
Selection
°C
Menu setting
Restore to
factory default
Set low
measurement alarm
Set high
measurement alarm
Select Automatic
Lock (HOLD)
Select backlight
Select temperature
unit
No – Yes
–1000 to +1000 mV
–1000 to +1000 mV
Off – On
Off – 1 – On
°C – °F
P1
P2
P3
P4
P5
P6
Factory default
–1000
1000
Off
1 (1-min auto-off)
No
A. High and Low Measurement Heads-Up Examples (P1 and P2)
Preset low value =
mV (stability icon ( ) displays on LCD) the red backlight appears
on display.
