Hach PHC729 Bedienungsanleitung

DOC022.53.80433

PHC729

05/2021, Edition 2

User Manual

Table of Contents

Section 1 Product overview................................................................................. 3

Section 2 Specifications........................................................................................ 3

Section 3 Safety information............................................................................... 4

3.1 Intended use ....................................................................................................... 4

3.2 Use of hazard information..................................................................................... 4

3.3 Precautionary labels............................................................................................. 5

3.4 Product hazards.................................................................................................... 5

Section 4 Preparation for use.............................................................................. 5

Section 5 Calibration.............................................................................................. 7

5.1 Calibration notes................................................................................................... 7

5.2 Calibration procedure........................................................................................... 8

Section 6 Sample measurement ...................................................................... 9

6.1 Sample requirements............................................................................................ 9

6.2 Sample measurement notes................................................................................. 9

6.3 Sample measurement procedure......................................................................... 9

Section 7 Verify the calibration........................................................................ 10

7.1 Verification procedure......................................................................................... 10

Section 8 Maintenance........................................................................................ 11

8.1 Clean the probe.................................................................................................. 11

8.2 Fill the probe....................................................................................................... 12

8.3 Add KCl crystals to the probe............................................................................. 12

8.4 Replace the filling solution.................................................................................. 14

8.5 Soak procedure for dry probes........................................................................... 15

8.6 Storage............................................................................................................... 15

Section 9 Troubleshooting ............................................................................... 16

Section 10 Consumables..................................................................................... 16

10.1 Recommended standards................................................................................. 17

10.2 Accessories...................................................................................................... 18

Table of Contents

Section 1 Product overview

The Intellical PHC729 pH probes are digital, combination electrodes with a flat sensing element that

measure the pH of flat surfaces or samples of low depth. The probes use the Red Rod technology

and a saturated KCl electrolyte for high performance. The probes are refillable and have a built-in

temperature sensor. A 59-mL bottle of reference electrolyte filling solution (saturated KCl solution) is

supplied with the probe. Refer to Figure 1.

Note: Do not use the probe to measure the pH of organic solvents, emulsions or samples with many solids. For the

best accuracy, do not use the probe to measure the pH of very alkaline samples.

Figure 1 Probe overview

1 Probe soaker bottle with storage solution 5 Probe soaker bottle holder

2 Filling-hole plug 6 Electrode filling and storage solution

3 Protective tape and filling hole 7 Reference junction

4 Cable 8 Flat sensing element and temperature

sensor

Section 2 Specifications

Specifications are subject to change without notice.

Specifications Details

Probe type Digital combination glass pH probe with refillable electrolyte and built-

in temperature sensor

pH range 0 to 12 pH

pH accuracy ±0.01 pH

Reference type Red Rod (Ag/AgCl in protective tubes)

Reference junction Annular porous ring

Slope –59 mV/pH (85 to 115% at 25 °C (77 °F) per Nernstian theoretical

value)

English 3

Specifications Details

Isopotential point 6.00 pH

Sodium (alkalinity) error <0.3 pH at pH 13 in 0.1 M NaOH

Temperature accuracy ±0.3 °C (±0.54 °F)

Temperature sensor type 30 kΩ NTC thermistor

Operating temperature –10 to 100 °C (14 to 212 °F)

Storage temperature 5 to 40 °C (41 to 104 °F)

Minimum immersion depth <1 mm (<0.04 in.)

Body material Glass

Electrolyte filling solution Saturated KCl

Storage solution Saturated KCl

Cable connection M12 digital output and connector

Dimensions Diameter: 12 mm (0.47 in.)

Length: 200 mm (7.9 in.) total; 103 mm (4.1 in.) below head

Cable length: 1 m (3.3 ft)

Warranty 1 year on the probe. This warranty covers manufacturing defects, but

not improper use or wear.

Certifications CE, FCC/ISED

Section 3 Safety information

3.1 Intended use

The Intellical PHC729 probe is intended for use by individuals in the laboratory who measure the pH

of flat surfaces or samples of low depth. The Intellical probes do not treat or alter samples.

3.2 Use of hazard information

D A N G E R

Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or

serious injury.

WARNING

Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death

or serious injury.

CAUTION

Indicates a potentially hazardous situation that may result in minor or moderate injury.

N O T I C E

Indicates a situation which, if not avoided, may cause damage to the instrument. Information that

requires special emphasis.

4 English

3.3 Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or damage to the instrument

could occur if not observed. A symbol on the instrument is referenced in the manual with a

precautionary statement.

Electrical equipment marked with this symbol may not be disposed of in European

domestic or public disposal systems. Return old or end-of-life equipment to the

manufacturer for disposal at no charge to the user.

3.4 Product hazards

CAUTION

Chemical exposure hazard. Obey laboratory safety procedures and wear all of the

personal protective equipment appropriate to the chemicals that are handled. Refer to

the current safety data sheets (MSDS/SDS) for safety protocols.

CAUTION

Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local,

regional and national regulations.

CAUTION

Personal injury hazard. Glass components can break. Handle with care to prevent cuts.

Section 4 Preparation for use

N O T I C E

Make sure to remove the protective tape from the filling hole of new probes. A probe with a blocked

filling hole will not operate correctly.

New probes are filled with electrolyte filling solution and have a soaker bottle that contains storage

solution to keep the glass bulb and reference junction hydrated. Prepare the probe for calibration and

measurement as follows.

1. Remove the protective tape from the filling hole. Refer to Figure 2.

Note: Put the soaker bottle on the soaker bottle holder when not in use.

2. Rinse the reference junction and glass bulb with deionized water. Blot dry with a lint-free cloth.

3. If the inner filling solution is low, add more filling solution. Refer to Fill the probe on page 12.

4. If the level of KCl crystals in the probe is less than approximately 0.5 cm (0.2 in.), or for

measurements at high temperatures (> 60 °C (140 °F), add more KCl crystals. Refer to Add KCl

crystals to the probe on page 12.

5. Invert the probe to make sure that the KCl crystals move freely through the liquid. If necessary,

shake the probe to loosen the crystals.

6. Soak the probe in a warm pH 4 buffer solution for approximately 1 hour to condition the probe.

Note: If probe stabilization is slow, soak the probe for 2 hours in a warm pH 4 buffer solution. The soak

procedure helps to dissolve KCl crystals in the reference junction.

English 5

7. Make sure that the meter has the correct date and time settings. The service-life time stamp in

the probe comes from the date and time settings in the meter.

Note: Some meters automatically open the date and time settings when the meter starts for the first time, or

after battery replacement.

8. Connect the probe to the meter.

9. Remove the filling-hole plug before use. Keep the level of the electrolyte filling solution above the

level of the measurement liquid during use. Refer to Figure 3.

Note: For measurements in low ionic strength (LIS) samples, soak the probe for a maximum of 5 minutes in the

sample before use.

Figure 2 Remove the protective tape

6 English

Figure 3 Probe position during use

1 Filling hole 3 Level of calibration solution

2 Level of electrolyte filling solution 4 Sample surface measurement

Section 5 Calibration

The procedure that follows is applicable to meters that can connect to Intellical pH probes. Refer to

the applicable meter documentation for meter operation and probe-specific settings.

5.1 Calibration notes

Read the notes that follow before calibration:

• Use prepared pH buffer solutions or mix pH buffer powder pillows with deionized water for

calibration. Discard the prepared buffer solutions after each calibration.

• Use two or three buffer solutions for best results. Two buffer solutions are sufficient if the expected

sample pH is between the pH of the two buffer solutions. The sequence in which the pH buffer

solutions are used is not important. Use buffer solutions that are 2 or more pH units apart.

• For a one-point calibration, use a pH buffer near the expected sample pH.

• Use the default calibration options or change the options in the probe settings menu.

• Use the single display mode for calibration when more than one probe is connected to the meter (if

applicable).

• Calibrate the probes and verify the calibration regularly for best results. Use the meter to set

calibration reminders.

• The calibration data is stored in the probe. When a calibrated probe is connected to a different

meter with the same calibration options, a new calibration is not necessary.

• Air bubbles below the sensor when in solution can cause a slow response or error in the

calibration. Make sure to remove air bubbles during calibration.

• The pH buffer solutions have known pH values at different temperatures. The meter uses the mV

and temperature readings of the probe in the pH buffer solutions to calculate a calibration slope.

During measurements, the meter adjusts the slope for the sample temperature to determine the

pH value of the sample.

English 7

5.2 Calibration procedure

1. Go to the

calibrate menu.

Select the probe, if

applicable. The

display shows the

pH buffer solutions

to use for calibration.

2. Prepare or pour

the pH buffer

solutions in different

beakers.

3. Open the filling

hole.

4. Rinse the probe

with deionized water.

Dry the probe with a

lint-free cloth.

5. Put the probe in

the first pH buffer

solution. Make sure

that the sensor and

reference junction

are fully in the

solution. Do not put

the probe on the

bottom or sides of

the beaker.

6. Shake the probe

from side to side to

refresh the reference

junction and remove

air bubbles.

Note: Be careful to not

hit the beaker and

damage the probe.

7. Stir slowly, then

read the pH value of

the buffer solution.

The display shows

the temperature-

corrected pH value

when the reading is

stable.

8. Continue with

steps 4 through 7 for

the remaining

buffers or select

Done.

9. Save the

calibration.

8 English

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