Oakton pHTestr 50 Instruction Manual

Operating Instructions

hold

cal esc

pHTestr® 50 and 50S Pocket Testers

Applications

• Aquaculture

• Aquariums

• Boilers

• Car washes

• Ecology

• Food sectors

• Hydroponics

• Labs

• Sanitation plants

• Steam generators

Getting Started

The pH tester has been factory calibrated and usually works well out of the box. However, after extended periods of non-use, it is best to ensure that the sensor is hydrated. Fill the cap with electrode storage solution or pH buffer and soak the sensor as needed to get a stable pH reading. A brief rinse with deionized (DI) water is OK, but avoid soaking or storing in deionized water as this will shorten pH electrode life. Prior to taking the measurements, periodic calibration with certiﬁed standards is recommended for best accuracy.

Buffer Set Selection

Select either USA (pH 4.01, pH 7.00 and pH 10.01) or NIST (pH 4.01, pH 6.86, and pH 9.18) to match your calibration standard values.

1. Press ON/OFF (

2. Press MENU/ The display shows Buffer and Backlight.

3. Press HOLD/

4. Press HOLD/ between the two buffer standards.

) to power on.

to enter setup window. Press HOLD/ to select Settings.

to select Buffer. The display shows USA and NIST.

to select USA or scroll down by pressing MENU/v to toggle

5. The display shows the selected buffer with a

Key Info Scroll Accept EXIT

MENU HOLD CAL

Settings Temp Set

Reset

Buffer Backlight

Backlight Settings

1. Press MENU/ The display shows Buffer and Backlight.

2. Scroll down by pressing MENU/ Press HOLD/

3. Scroll down by pressing MENU/ Backlight ON increases readability in low-light conditions.

4. Press HOLD/ the selected backlight option with a

to enter setup window. Press HOLD/ to select Settings.

to toggle between Buffer and Backlight.

to select Backlight. The display shows ON and OFF.

to toggle between ON and OFF.

to select the desired backlight option. The display shows

Key Info Scroll Accept EXIT

MENU HOLD CAL

Settings

Temp Set Reset

Buffer

Backlight

• Spas

• Studies

• Water and wastewater

treatment

• Water quality testing

in pools and more

USA NIST

Backlight ON

OFF

USA

OFF

Temperature Settings

1. Press MENU/

to select Temp Set. Press HOLD/ to select Temp Set. The display shows Set °C/°F and Temp Cal.

2. Press HOLD/

3. Scroll down by pressing MENU/

4. Press HOLD/

to enter setup window. Scroll down by pressing MENU/v

to select Set °C/°F. Display automatically shows °C and ° F.

to toggle between °C and °F.

to select the desired temperature unit.

Key Info

MENU HOLD CAL

Settings Temp Set Reset

Set °C/°F Temp Cal

°C °F

Scroll Accept EXIT

°C

Temperature Calibration

1. Press MENU/

to highlight Temp Set. Press HOLD/ to select Temp Set. The display shows Set °C/°F and Temp Cal.

2. Scroll down by pressing MENU/ Cal. Press HOLD/

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 temperature sensor to stabilize.

5. Press MENU/ conﬁrm the new temperature value of the solution.

Note: To exit this program without conﬁrming the calibration, press CAL/ESC.

to enter setup window. Scroll down by pressing MENU/v

to toggle between Set °C/°F and Temp

to select Temp Cal.

to adjust the temperature value, then press HOLD/ to

Key Info Scroll Accept EXIT

MENU HOLD CAL

Settings Temp Set

Reset

Set °C/°F

Temp Cal

23.4 °C

23.4°C

pH Calibration

Calibration should be done regularly, preferably once a week or more if using the tester daily. You can calibrate up to three points using standards from either the USA or the NIST buffer groups. For best results, use a minimum of two pH buffers such as pH 4 and pH 7.

1. Press ON/OFF (

2. Dip sensor in about 2 cm to 3 cm into the pH standard buffer solution. If using the supplied cap, ﬁll to the "MAX" line. For best results, allow the reading to stabilize if needed before proceeding.

3. Press the CAL/ESC key to enter calibration mode. The CAL indicator will be displayed. The upper display will show the unadjusted factory default reading while the lower display will search for the corresponding value from the selected buffer group.

Note: All testers have dual display during calibration mode. To abort calibration, press CAL/ESC.

4. The timer icon will blink while the reading stabilizes (allow 1 to 2 minutes). Once the reading is stabilized, the timer stops blinking. The tester will automatically conﬁrm the calibration value and return to the measurement window when successful.

5. Rinse electrode and repeat with other buffers if necessary.

) to power the tester on if needed.

CAL

cal esc

Place the tester in the buffer to start or press to escape.

CAL

7.45

7.01

25.0°C

7.01

25.5°C

Measurement

1. Press ON/OFF ( ) to power the tester on if needed.

2. Dip the sensor in about 2 cm to 3 cm into the sample. If using the supplied cap, ﬁll to the "MAX" line. Stir and let the reading stabilize. The timer icon will blink during this time. Once the reading is stable,

CAUTION: Testing dry samples is not recommended and can lead to sensor damage. Soils must be wet and free from particulates that may scratch the glass sensor. Excessive force into dry samples can cause glass breakage.

3. Note the pH value or press HOLD/ To release the reading, press HOLD/

4. Press ON/OFF ( for 8.5 minutes, the tester will automatically shut off to conserve batteries.

) for 3 seconds to turn off tester. If you do not press a button

to freeze the reading.

again.

will appear.

4.01

25.5°C

User Reset

Reset to the user’s default settings by using the User Reset function. Buffer selection and temperature user calibration are not affected by the User Reset function.

1. Press MENU/ select Reset. Press HOLD/

to enter setup window. Scroll down by pressing MENU/v to

to select Reset. The display shows User Reset

and Factory Reset.

2. Press HOLD/ No and Yes.

3. Scroll down by pressing MENU/

4. Press HOLD/ User Reset option with a

to select User Reset. The display automatically shows

to toggle between No and Yes.

to conﬁrm either No or Yes. The display shows the

Key Info Scroll Accept EXIT

MENU HOLD CAL

Settings Temp Set

Reset

hold

User Reset Factory Reset

hold

No Yes

hold

Factory Reset

Reset the pH calibration to the factory reset default by using the Factory Reset function.

1. Press MENU/ MENU/ User Reset and Factory Reset.

2. Scroll down by pressing the MENU/ HOLD/

3. Scroll down by pressing MENU/

4. Press HOLD/ Reset option with a

to enter setup window. Scroll down by pressing the

to select Reset. Press HOLD/ to select Reset. The display shows

to select Factory Reset. The display automatically shows No and Yes.

to toggle between the resets. Press

to toggle between No and Yes.

to conﬁrm either No or Yes. The display shows the Factory

Key Info Scroll Accept EXIT

MENU HOLD CAL

Settings Temp Set Reset

hold

User Reset

Factory Reset

hold

No Yes

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MTS - Manual Temperature Setting (pHTestr 50S only)

The MTS range is 0°C to 60.0°C (32.0°F to140.0°F). User reset will set temperature to default value 25°C or 77°F.

1. Press MENU/

to select Temp Set. Press HOLD/ to select Temp Set. The display shows

to select setup window. Scroll down by pressing MENU/v

Set °C/°F and Temp Cal.

2. Scroll down by pressing MENU/ Temp Cal. Press HOLD/

to select Temp Cal.

to toggle between Set °C/°F and

4. Dip the tester into a solution of known temperature and allow time for the built-in temperature sensor to stabilize.

5. Press MENU/ conﬁ rm the calibrated value as new temperature value of the solution.

to adjust the temperature value or press the HOLD/ to

Note: To exit this program without conﬁ rming the calibration, press CAL/ESC before the automatic conﬁ rmation takes place.

Key Info

Scroll Accept EXIT

MENU HOLD CAL

Settings Temp Set

Reset

hold

Set °C/°F

Temp Cal

hold

Temp Cal

23.4 °C

hold

23.4 °C

HOLD Function

This feature helps to freeze the display reading for a delayed observation.

1. Press HOLD/ button to

freeze the measurement.

4.01

23.5 °C

Press HOLD to release

23.5 °C

4.01

2. Press HOLD/ again to

release the measurement.

Press HOLD to release

23.5 °C

4.01

holdhold

4.01

23.5 °C

Sensor Maintenance

1. Before measuring soil pH with the pHTestr 50S, wet your soil sample with distilled water and ensure that the soil is free of particulates. Even though the pHTestr 50S is rugged, hard surfaces such as stones and pebbles can still cause breakage.

2. Rinse the sensor with sensor storage solution after each measurement. Care has to be taken not to damage the sensor’s glass electrode especially while rinsing the pHTestr 50S penetrating tip electrode.

3. In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins, take readings quickly and rinse electrode immediately afterward. For the pHTestr 50S, the remnants of the semisolid samples on the penetrating electrode can be removed by rubbing it with some table salt and then rinsing. Mild detergent and warm water can be used to wash the penetrating electrode clean.

4. For best results, keep pH electrode stored upright in protective storage cap with electrode storage solution to keep the sensor hydrated. For pHTestr 50S, keep tip moistened in sleeve with electrode storage solution. Never store your pHTestr in deionized water for extended periods. Use deionized water for rinsing only.

Sensor Replacement

You can replace the sensor module at the fraction of the cost of a new tester.

When the tester fails to calibrate or gives ﬂ uctuating readings in calibration

standards, you need to change the sensor.

1. With dry hands, grip the ring with sensor facing you. Twist the ring

counterclockwise. Save the ring for later use.

2. Pull the old sensor module away from the tester.

3. Align the four tabs on the new sensor module so that they match the four slots on the tester.

4. Gently push the module onto the slots to sit it in position. Push the smaller O-ring fully onto the new sensor module. Push the other O-ring over the module and thread sensor ring into place by ﬁ rmly twisting clockwise.

Note: It is necessary that you recalibrate your tester prior to measurement after a sensor replacement.

Replacing the Batteries

The pH tester uses four AAA

1.5 V batteries.

1. To remove the battery cover, See Figure 1. Clear the front catch and then the back catch, before sliding the cover off.

Fig. 1: Removing battery cover

Fig. 2: Push to unlock

2. To remove the battery plate, push the center tab towards the front of the tester as shown in Figure 2. Once unlocked, remove the plate to access the batteries.

3. Invert the tester upside down to remove the batteries. Each side uses two AAA batteries.

Fig. 3: Align tabs

Fig. 4: Push down to lock

Orient each battery with positive terminal facing downward.

4. To lock the battery plate, align the small tabs (Figure 3) into the guide ribs on the housing and then press down. See Figure 4.

Fig. 5: Battery plate unlocked Fig. 6: Battery plate locked

Warranty

This instrument is supplied with a warranty against manufacturing defects for a period of one year from the date of purchase.

Return of Items

Authorization must be obtained from your distributor before returning items

for any reason. When applying for authorization, please include information regarding the reason the item(s) are to be returned. We reserve the right to

make improvements in design, construction and appearance of products without notice. Prices are subject to change without notice.

Self-Diagnostic Messages

Batteries are weak and need replacement soon.

stable error

buffer error The buffer is outside of the calibration range.

slope error The 2 over range The reading is above the measuring range of tester.

under range The reading is below the measuring range of tester.

Appears when calibration is attempted but the reading is not yet stable. Wait for the reading to stabilize or manually conﬁ rm the calibration by pressing enter.

or 3rd calibration point is not within 80% to 120% slope range.

Accessories

Ordering Code Product Description

35634-15 pHTestr 50 pocket tester with case, lanyard, and batteries 35634-25 pHTestr 50S spear-tip pocket tester with case, lanyard, and batteries 35634-17 Replacement sensor module for pHTestr 50 35634-27 Replacement sensor module for pHTestr 50S 35634-09 Replacement sensor cap for pHTestr 50 only 09376-00 Replacement alkaline batteries; AAA, 1.5 V. Pack of 12 17101-45 NIST-traceable calibration with data for pH testers

Specifications pHTestr 50 pHTestr 50S (spear tip)

pH range –1.00 to 15.00 pH –1.00 to 15.0 pH Resolution 0.01 pH 0.01 pH Relative accuracy ± 0.01 pH ± 0.01 pH Calibration points Up to 3 points Up to 3 points

Buffer set standard selection

USA 4.01/7.00/10.01

NIST 4.01/6.86/9.18

USA 4.01/7.00/10.01

NIST 4.01/6.86/9.18

Calibration window ±1.00 pH ±1.00 pH Calibration type Point to Point Point to Point

Temperature

Temperature range 0 to 60°C / 32 to 140.0°F 0 to 60°C / 32 to 140.0°F Temp. resolution 0.1°C / 0.1°F 0.1°C / 0.1°F

Temperature accuracy

Temperature compensation

From 0 to 50ºC (±0.5ºC / ±0.9ºF

+ 1 LSD); From 50 to 60ºC

(±1.0ºC / ±1.8 ºF + 1 LSD)

Yes (Automatic Temperature

Compensation)

Yes (Manual Temperature

Compensation)

General

Display Graphics, dot matrix 80 x 100 pixel Graphics, dot matrix 80 x 100 pixel Auto off 8.5 minutes (from last key press) 8.5 minutes (from last key press) Reset User / Factory User / Factory Power requirement Four AAA 1.5 V batteries Four AAA 1.5 V batteries Battey life >250 hours >250 hours Waterproofing IP67 IP67 Ambient operating

temperature

5 to 45°C / 41 to 113°F 5 to 45°C / 41 to 113°F

Relative humidity 5% to 85% noncondensing 5% to 85% noncondensing Storage temp. –20 to 60°C / –4 to 140°F –20 to 60°C / –4 to 140°F Storage humidity 5% to 85% noncondensing 5% to 85% noncondensing

www.4oakton.com

1065O100_MAN_35634-15,-25 August, 2017

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Oakton pHTestr 50 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual