HACH LANGE PHC20101 User manual

User Manual DOC022.52.80197

General use pH probe: Models PHC20101, PHC20103

Safety information

Precautionary labels

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

instrument could occur if not observed.

Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after 12

August of 2005. In conformity with European local and national regulations (EU Directive 2002/98/EC), European

electrical equipment users must now return old or end-of-life equipment to the Producer for disposal at no charge to

the user.

Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return end-of-life

equipment, producer-supplied electrical accessories, and all auxillary items for proper disposal.

Specifications

Note: Specifications are subject to change without notice.

Specifications Details

Probe type Digital combination non-refillable, semi-liquid gel-filled probe with double

junction reference and built-in temperature sensor

pH range pH 0 to 14

pH resolution User-selectable stabilization time and resolution—Fast: 0.1, Fast: 0.01,

Medium: 0.01, Slow: 0.01 or Slow: 0.001

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

Operating temperature range 0 to 80 °C (32 to 176 °F)

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

Junction Ceramic

Reference type Ag/AgCl

Sodium (alkalinity) error <20% at pH 14 in 1 M NaCl

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

Minimum sample depth 15 mm (0.59 in.)

Dimensions (standard) Diameter: 12 mm (0.47 in.)

Length: 103 mm (4.056 in.)

Total length: 200 mm (7.9 in.)

Cable length: 1 or 3 m (3.28 or 9.84 ft)

Cable connection M12 digital output and connector compatible with HQd meters

Product overview

The PHC201 series probe is a non-refillable, semi-liquid gel-filled combination pH probe

with a built-in temperature sensor (Figure 1). The standard PHC20101 or PHC20103 probe

comes with a 1 or 3 m (3.28 or 9.84 ft) cable and is intended for laboratory use. The probe

provides pH measurement in general aqueous applications. The probe is not suitable for

use with organic solvents, low ionic strength, wastewater, high solids or high alkaline sample

types.

Figure 1 Probe overview

1Probe soaker bottle 4Reference junction

2Standard probe (1 or 3 meter cable) 5Glass bulb and temperature sensor

3Soaker bottle holder

Preparation for use

To prepare the probe for initial use:

1. Turn the probe soaker bottle cap counter-clockwise to loosen the cap. Remove the

soaker bottle from the probe.

2. If the probe will be used immediately, prepare the probe for calibration or sample

measurement.

3. If the probe will not be used immediately, store the probe (Storage on page 9).

To prepare the probe for calibration or sample measurement:

1. Turn the probe soaker bottle cap counter-clockwise to loosen the cap. Remove the

soaker bottle from the probe.

2. Rinse the reference junctions and glass bulb thoroughly with deionized water to remove

the 3 M KCl solution completely. Blot dry with a lint-free cloth.

3. Rinse the reference junction and glass bulb thoroughly with deionized water to remove

the 3 M KCl solution completely. Blot dry with a lint-free cloth.

4. For the best stabilization time, condition the probe for several minutes in the sample

before use.

Calibration

Before calibration:

The probe must have the correct service-life time stamp. Set the date and time in the meter before the probe is attached.

It is not necessary to recalibrate when moving a calibrated probe from one HQd meter to another if the additional meter is

configured to use the same calibration options.

To view the current calibration, push , select View Probe Data, then select View Current Calibration.

When two probes are connected, push the UP or DOWN arrow to change to the single display mode in order to show the

Calibrate option. (Available only on HQ40d and HQ440d meters.)

Prepare the probe for use (refer to Preparation for use on page 2).

2DOC022.52.80197

Calibration notes

• pH buffers can be used in any order. Use buffers that are two pH units apart.

• Additional standard sets along with the minimum number of calibration points can be

selected in the Calibration Options. For a two point calibration, it is recommended that

two buffers be selected: one with a pH above and one with a pH below the expected

sample pH. For a one point calibration, select the buffer nearest to the expected sample

pH.

• The calibration is recorded in the probe and the data log. The calibration is also sent to

a PC, printer or flash memory stick if connected.

• Air bubbles under the sensor tip when submerged can cause slow response or error in

measurement. If bubbles are present, gently shake the probe until bubbles are removed.

• If a calibration error occurs, refer to Troubleshooting on page 10.

Calibration procedure PHC201

1. Connect the

probe to the meter.

Make sure that the

cable locking nut is

securely

connected to the

meter. Turn on the

meter.

2. Push

Calibrate. The

display shows the

buffers that are

necessary for

calibration.

3. Prepare the

fresh buffers in

separate beakers

or appropriate

containers.

4. Rinse the probe

with deionized

water. Blot dry with

a lint-free cloth.

5. Put the probe in

the pH buffer

solution and stir

gently. Make sure

that the reference

junction is

completely

submerged. Shake

the probe from

side to side in the

standard solution

to refresh the

reference junction.

6. Push Read.

Stir gently. The

display will show

"Stabilizing" and a

progress bar as

the probe

stabilizes in the

standard. The

display shows the

buffer that has just

been read and

shows the

temperature

corrected pH value

when the reading

is stable.

7. Repeat steps 4

- 6 until the

minimum number

of calibration

points specified in

the current method

have been

collected.

8. Push Done to

view the calibration

summary. The

display will not

show Done until

the minimum

number of

calibration points

have been

collected.

9. Push Store to

accept the

calibration and go

back to

measurement

mode.

DOC022.52.80197 3

Sample measurement

Before measurement:

The probe must have the correct service-life time stamp. Set the date and time in the meter before the probe is attached.

If complete traceability is necessary, enter a sample ID and operator ID before measurement. Refer to the HQd meter manual

for more information.

Regular calibration is required for the best measurement accuracy (refer to Calibration on page 2).

Prepare the probe for use (refer to Preparation for use on page 2).

Measurement notes

• Data is automatically stored in the data log when Press to Read or Interval is selected

in the Measurement Mode. When Continuous is selected, data will only be stored when

Store is pushed.

• Air bubbles under the sensor tip when submerged can cause slow response or error in

measurement. If bubbles are present, gently shake the probe until bubbles are removed.

• If a measurement error occurs, refer to Troubleshooting on page 10.

Measurement procedure

1. Connect the

probe to the meter.

Make sure that the

cable locking nut is

securely

connected to the

meter. Turn the

meter on.

2. For the best

stabilization time,

condition the probe

for several minutes

in the sample or in

a solution

comparable to the

sample in terms of

pH and ionic

strength before the

initial sample

measurement.

3. Rinse the probe

with deionized

water, then with

the sample. Blot

dry with a lint-free

cloth.

4. Put the probe in

the sample and stir

gently. Make sure

that the reference

junction is

completely

submerged. Do not

put the probe on

the bottom or sides

of the container.

Shake the probe

from side to side in

the sample to

refresh the

reference junction.

5. Push Read.

The display will

show "Stabilizing"

and a progress bar

as the probe

stabilizes in the

sample. The

display will show

the lock icon when

the reading

stabilizes.

6. Repeat steps

3-5 for additional

measurements.

7. When

measurements are

done, store the

probe (refer to

Storage

on page 9).

4DOC022.52.80197

Run a check standard

The run check standard feature validates instrument performance between sample

measurements. Use the run check standard feature for periodic or user-defined interval

measurements of a traceable standard solution. Set the criteria for check standards from

the PHC201 Settings menu.

Note: Access control must be off or a valid password must be entered before any of the check standard

method options can be changed.

1. Push . The Full Access Options menu is shown.

2. Select Run Check Standard.

Note: Select the correct probe if two probes are connected to the meter.

3. Get the standard solution shown on the display.

4. Rinse the probe with deionized water. Blot dry with a lint-free cloth.

5. Put the probe in the standard solution until the temperature sensor is completely

submerged. Move the probe up or down or gently shake the probe to remove air

bubbles.

6. Push Read. The display will show "Stabilizing" and a progress bar as the reading

stabilizes. The display shows the value of the check standard and either Check

Standard Passed or Check Standard Failed.

7. If the display shows Check Standard Passed, the check standard measurement is

within the accepted limits set by the administrative user. Select Done to continue with

the sample measurement.

8. If the display shows Check Standard Failed, the measurement is outside of accepted

limits set by the administrative user and a recalibration is recommended. If the

acceptance criteria is set to Cal Expires on Failure: Yes, the display shows the

calibration icon and a question mark until the probe is recalibrated. To correct the probe

calibration and status indicator, calibrate the probe (refer to Calibration on page 2).

Advanced operation

Parameter-specific settings can be changed through the Full Access Options menu. Details

about menu navigation, available options and how to change them are given in the screens,

tables and procedures throughout this section.

The settings that can be changed are shown in Table 1.

Table 1 Parameter-specific settings

Setting Options

Measurement Options • Resolution

• Upper and lower range limits

Calibration Options • Buffer set

• Buffer set values (if Custom Buffer Set selected)

• Reminder

• Minimum Cal points

• Slope limit

Check Standard Options • Standard (temperature compensated buffer or custom at 25 °C)

• Reminder

• Acceptance criteria

• Standard value at 25 °C (if custom standard selected)

Units • pH

• mV

DOC022.52.80197 5

Change measurement options

Methods are groups of default or user-defined settings relevant to specific applications. If

the meter is set to the default method and the Modify Current Settings option is chosen, a

prompt for a new name is shown after the changes are entered. The settings are saved with

this name to distinguish them from the default method settings, which cannot be changed.

A saved method can be used instead of multiple adjustments to the individual settings.

Changes made to a user-defined method are automatically saved with the existing name.

Multiple methods can be saved for the same probe on each meter.

1. Make sure a probe is connected to the meter.

2. Push and select PHC201 Settings.

3. Select Modify Current Settings.

4. Select Units. Select pH (default) or mV.

Note: The mV option can be used to find the probe offset in a pH 7 buffer or to measure the slope.

Both units are shown when the detail display mode is selected.

5. Select Measurement Options and update the settings:

Option Description

Resolution Sets the resolution:

• 0.1pH—Fast

• 0.01pH—Fast (default)

• 0.01pH—Medium

• 0.01pH—Slow, or

• 0.001pH—Slow

The resolution affects the number of decimal places and the stabilization

time. Higher resolution measurements take more time to stabilize. Slower

stabilization times provide higher accuracy measurements.

Measurement

Limits

Set the measurement limits—Lower limit (default: 0.00 pH) or Upper limit

(default: 14.00 pH).

The measurement limits can be set to match the acceptable values for the

sample. When the measurement is above the upper limit setting or below the

lower limit setting, the meter shows an "Out of limits" message. This message

is an alert to a potential problem with the process conditions.

6. If prompted, enter a name for the new method settings. Additional changes made to the

settings of an existing method are automatically saved with the same method name.

7. Push EXIT until the meter returns to the measurement mode.

Change calibration options

1. Make sure a probe is connected to the meter.

2. Push and select PHC201 Settings.

3. Select Modify Current Settings.

6DOC022.52.80197

4. Select Calibration Options and update the settings:

Option Description

Buffer Set Sets the temperature compensated buffer set used for calibration—

• Color Coded—4.01, 7.00, 10.01 (default)

• IUPAC—1.68, 4.01, 7.00, 10.01, 12.45

• DIN—1.09, 4.65, 9.23

• IUPAC—1.68, 4.01, 6.86, 10.01, 12.45

• IUPAC—1.68, 4.01, 6.86, 9.18, 12.45

• IUPAC—1.68, 4.01, 7.00, 9.18, 12.45

• Custom Buffer Set (refer to Table 2)

Custom buffer sets are characterized at 25 °C (77 °F).

Buffer set values are shown on the Calibration Options screen.

Note: Only the minimum calibration points must be measured for DONE to be

shown on the calibration screen.

Buffer Set

Values

If the Buffer Set is set to Customer Buffer Set, sets the custom buffer set (refer

to Table 2).

Minimum Cal

Points

Sets the minimum number of calibration points necessary before a calibration

can be completed—1 (default), 2 or 3.

Slope Limit Sets the slope limit—1% to 20% (acceptable slope criteria, default = 15%).

The slope must fall within set limits for successful calibration.

5. Select Calibration Reminder and update the settings:

Option Description

Reminder

Repeat

Meter will make an audible sound when a calibration is due and repeat the

sound at the selected interval—Off (default), 2 h, 4 h, 8 h, 2 d, 5 d or 7 d.

Expires Calibration expires after the selected time—Immediately, Reminder + 30 min,

Reminder + 1 h, Reminder + 2 h or Continue Reading.

Note: The meter cannot be used to read samples after calibration has expired

unless Continue Reading is selected.

6. If prompted, enter a name for the new method settings. Additional changes made to the

settings of an existing method are automatically saved with the same method name.

7. Push EXIT until the meter returns to the measurement mode.

DOC022.52.80197 7

Table 2 Custom buffer sets

Buffer set values Option Description

Std1

Std2

Std3

Std4

Std5

1.09pH—25 °C Pre-set temperature compensated buffer values.

Note: Selected standards must differ by a minimum of 2 pH units. For example, if 1.09pH is chosen

for the first standard, the second standard must differ by at least 2 pH. Standards that do not meet

this minimum will appear gray on the screen and will not be selectable.

1.68pH—25 °C

4.01pH—25 °C

4.65pH—25 °C

6.86pH—25 °C

7.00pH—25 °C

9.18pH—25 °C

9.23pH—25 °C

10.01pH—25

°C

12.45pH—25

°C

Custom Buffer Custom buffer value.

Range = 0.000 pH to 14.000 pH.

Custom buffer values are not temperature compensated. Custom buffers should be read

at 25 °C.

No Buffer Standard is undefined when this option is selected.

Change check standard options

1. Make sure a probe is connected to the meter.

2. Push and select PHC201 Settings.

3. Select Modify Current Settings.

4. Select Check Standards Options and update the settings:

Option Description

Standard Sets the temperature compensated buffer value for check standard—

• 1.09pH—25 °C

• 1.68pH—25 °C

• 4.01pH—25 °C

• 4.65pH—25 °C

• 6.86pH—25 °C

• 7.00pH—25 °C

• 9.18pH—25 °C

• 9.23pH—25 °C

• 10.01pH—25 °C

• 12.45pH—25 °C

• Custom

The standard value is shown on the Check Standard Options screen.

No temperature compensation for custom buffers.

Standard

Value

When Standard is set to Custom, enter the standard value using the up/down

arrow keys.

8DOC022.52.80197

5. Select Check Standard Reminder and update the settings:

Option Description

Reminder Repeat Sets the time interval for the check standard reminder—Off, 30 minutes, 2

h, 4 h, 8 h, 12 h or 24 h.

Allow Defer Allows the postponement of check standard reminders—Yes or No.

6. Select Acceptance Criteria and update the settings:

Option Description

Acceptance Limits Sets the tolerance limits for check standard—0.005pH to 1.000pH

(default 0.050 pH).

Cal Expires on Failure Recalibration required if check standard fails—Yes or No.

7. If prompted, enter a name for the new method settings. Additional changes made to the

settings of an existing method are automatically saved with the same method name.

8. Push EXIT until the meter returns to the measurement mode.

Maintenance

Clean the probe

Clean the probe when:

• Drifting/inaccurate readings occur as a result of contamination on the glass sensor or

the probe being left dry for extended periods of time.

• Slow stabilization time occurs as a result of contamination on the glass sensor.

• A calibration error occurs as a result of contamination on the glass sensor.

The type of contamination will determine the cleaning solution needed.

For general contaminants:

1. Rinse the probe with deionized water and blot dry with a lint-free cloth.

2. Soak the glass bulb for 12 to 16 hours in Hach Electrode Cleaning Solution.

3. Rinse or soak the probe for 1 minute in deionized water.

4. Soak the probe in pH 4 buffer for up to 20 minutes, then rinse with deionized water.

5. Blot dry with a lint-free cloth.

For mineral deposits:

1. Rinse the probe with deionized water and blot dry with a lint-free cloth.

2. Soak the glass bulb for 10 to 15 minutes in 0.1 M HCl.

3. Rinse or soak the probe for one minute in deionized water.

4. Soak the probe in pH 4 buffer for up to 20 minutes. Rinse with deionized water.

5. Blot dry with a lint-free cloth.

For fats, grease and oils:

1. Soak the glass bulb in a warm detergent solution for up to 2 hours.

2. Rinse or soak the probe for 1 minute in deionized water.

3. Soak the probe in pH 4 buffer for up to 20 minutes, then rinse with deionized water.

4. Blot dry with a lint-free cloth.

Storage

Short-term and long-term storage

For the best probe performance, do not let the reference junction become dry.

1. Rinse the probe with deionized water. Dry the probe with a lint-free cloth.

DOC022.52.80197 9

2. Fill the probe storage cap or soaker bottle half full with Hach Electrode Storage Solution

or 3 M potassium chloride (KCl) solution.

3. Put the soaker bottle on the probe and tighten the soaker bottle cap.

4. Make sure that the solution in the storage cap or soaker bottle completely covers the

glass bulb and reference junction.

Note: The probe can also be stored in a sample for up to 2 hours if the sample pH is not high.

If the glass bulb becomes dry:

Rehydration

1. Soak the probe tip in the 4.01, 7.00 and 10.01 buffers each for 5 minutes.

2. Rinse the probe with deionized water. Blot dry with a lint-free cloth.

3. Calibrate the probe.

Troubleshooting

Message or symptom Possible cause Action

Probe not supported Software not updated Update the HQd software to the newest revision at http://

www.hach.com/SoftwareDownloads. Refer to the HQd Series

meter manual for specific instructions for the meter model.

HQd meter does not support

IntelliCAL® probe

Contact a Technical Support Representative.

Connect a probe or

probe requires service

Probe not connected properly Disconnect, then connect the probe. Tighten the locking nut.

Software not updated Update the HQd software to the newest revision at http://

www.hach.com/SoftwareDownloads. Refer to the HQd Series

meter manual.

Large number of methods stored Continue to let probe connect. Do not disconnect the probe.

Damaged probe Make sure there is connectivity with another probe or meter to

confirm isolated issue with probe. Contact a Technical Support

Representative.

Standard not recognized

error

Probe storage cap or soaker bottle

not removed.

Remove the probe storage cap or soaker bottle.

Incorrect or contaminated buffer

solution

Use fresh buffer solution as specified in the method.

pH reading and/or mV

reading is same for all

solutions

Storage cap or soaker bottle not

removed

Remove the storage cap or soaker bottle.

Electrical issue Contact a Technical Support Representative.

Slow stabilization time Contaminated glass sensor Clean the probe (refer to Clean the probe on page 9).

Poor contact between reference

junction and solution

Shake the probe in the solution from side to side to refresh the

reference junction.

Probe not prepared for sample For the best stabilization time, soak the probe in the sample

for several minutes before doing a sample measurement.

Low sample temperature or

temperature difference between

samples

Check the sample temperature. The lower the temperature or

the greater the difference of temperatures between samples,

the longer the stabilization time will be.

Air bubbles around inner reference

electrode

Gently tap the probe with hand or shake the probe downward

to remove any air bubbles.

10 DOC022.52.80197

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