Hach Intellical MTC30101 Bedienungsanleitung

User Manual DOC022.52.80026

Refillable ORP/Redox Probe: Model MTC30101 or MTC30103

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. 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.

Specifications

Note: Specifications are subject to change without notice.

Specifications Details

Probe type Digital combination electrode with a refillable Ag/AgCl reference and a built-

in temperature sensor

Range ±1200 mV

Resolution 0.1 mV

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

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 potential versus Standard

Hydrogen Electrode

207 mV at 25 °C

Fill solution 3M KCl with saturated AgCl

Reference type Ag/AgCl (3 M KCl)

Minimum sample depth 20 mm

Dimensions Diameter: 12 mm (0.47 in.)

Length: 175 mm (6.89 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 MTC301 series probe is a refillable, combination oxidation reduction potential

(ORP/Redox) probe with a built-in temperature sensor (Figure 1). The MTC30101 or

MTC30103 probe is available with a 1 or 3 m (3.28 or 9.84 ft) cable and is intended for

laboratory use. The probe measures absolute mV values in wastewater, drinking water

and general applications. The probe measures ORP/Redox in wastewater, drinking water

and general applications. A 59 mL bottle of reference electrolyte filling solution (3M KCl

solution saturated with AgCl) is included with the probe.

Figure 1 Probe overview

1 Probe soaker bottle 4 Protective tape and filing-hole

2 Reference junction, platinum and temperature sensor 5 1 or 3 meter (3.28 or 9.84 ft) cable

3 Filling-hole cap 6 Probe soaker bottle holder

Preparation for use

Prepare the probe for use before calibration or sample measurement.

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

2. Remove the soaker bottle from the probe.

3. Rinse the reference junctions and electrode with deionized water thoroughly to

remove the viscous storage/filling solution completely. Blot dry with a lint-free cloth.

4. Remove the protective tape from the filling hole before initial use (refer to Figure 1

on page 2). Dispose of the protective tape.

5. Add filling solution to the probe as necessary (refer to Fill the probe on page 11).

The filling solution must be above the standard solution or sample level during

measurement (Figure 2).

6. Make sure that the filling hole is open during measurement for the proper flow of the

filling solution.

Figure 2 Measurement method

1 Container 3 Filling solution level

2 Probe body 4 Standard solution or sample level

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.

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

Calibrate option.

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

Calibration notes:

• Additional standards can be selected in the Calibration Options.

• Do not dilute ORP/Redox standards. Use fresh ORP/Redox standard for calibration.

• ZoBell’s redox potential is temperature dependent. The HQd calibration routine

factors in this temperature dependency allowing accurate calibrations within the

temperature range of 0 to 30 °C (32 to 86 °F). Light’s solution should be read at 25 °C

(77 °F). Custom ORP/Redox calibration solution values and temperature are user-

defined.

• 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 12.

Calibration procedure:

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

ORP/Redox

standard solution

that is necessary

for calibration.

3. Add the fresh

ORP/Redox

standard solution

to a beaker or an

appropriate

container.

4. Rinse the

probe with

deionized water.

Blot dry with a lint-

free cloth.

5. Put the probe

in the standard

solution so that

the temperature

sensor is

completely

submerged. Stir

gently. Shake the

probe from side to

side in the sample

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

sample. The

display shows the

standard solution

value and the mV

offset when the

reading is stable.

7. Push Done to

view the

calibration

summary.

8. Push Store to

accept the

calibration and go

back to the

measurement

mode.

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 3).

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

Make sure that the platinum disc is clean and smooth (refer to Clean the probe on page 10).

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 selected.

• 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 12.

Measurement—direct method 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. To significantly

reduce the

stabilization time

for reducing-type

samples, put the

platinum disc in

Reducing Solution

for ORP

Electrodes for

3-10 minutes

before the initial

sample

measurement.

3. Rinse the probe

with the sample.

4. Put the probe in

the sample and

stir gently. Make

sure that the

reference

junctions are

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. If

necessary for the

application, record

the sample pH

and temperature.

6. Repeat steps

3-6 for additional

measurements.

7. When

measurements

are done, store

the probe (refer to

Storage

on page 11).

Measurement—conversion to SHE reference procedure:

For some applications, it is customary to report redox potential readings relative to the

standard hydrogen electrode (SHE), also called normal hydrogen electrode (NHE). To do

this, select the value in Table 1 that corresponds to the temperature of the solution

measured. Substitute that value Eref into the equation and solve for Eh:

Eh = E + Eref

where:

Eh = oxidation reduction potential of the sample relative to the SHE

E = potential developed by the ORP/Redox electrode

Eref = potential developed by the reference electrode portion relative to the SHE

(Table 1).

Table 1 shows the potentials, Eref, developed by the reference electrode portion relative

to the SHE at various temperatures.

Table 1 Standard potential of reference electrode

Temperature (°C) Electrode potential in mV (Eref)

80 163.1

75 167.7

Table 1 Standard potential of reference electrode (continued)

Temperature (°C) Electrode potential in mV (Eref)

70 172.1

65 176.4

60 180.3

55 184.4

50 188.4

45 192.3

40 196.1

35 199.8

30 203.4

25 207.0

20 210.5

15 214.0

10 217.4

5 220.9

0 224.2

Measurement—oxidation titrations procedure:

Oxidation-reduction, or redox titrations, give a simple, reliable method to identify many

substances in a solution. A redox titration consists of adding to an unknown sample, small

increment of a titrant that converts the unknown to a different oxidation state. After each

addition of titrant, the ORP/Redox electrode develops a potential proportional to the

logarithm of the ratio of the activities of the two oxidation states.

At the inflection, or end point, the titrant has completely oxidized or reduced the unknown,

causing a sharp change in the logarithm of the ratio of the activities of the two oxidation

states. A corresponding sharp change in the potential is developed by the platinum

electrode. Often several oxidizing or reducing species can be precisely identified in the

same solution by a single titration with several inflection points.

The following directions represent a general procedure for doing a redox titration once the

sample is prepared for measurement.

1. Fill a 10 mL

burette with a

standard titrant

solution with a

normality that is

5-10 times that of

the sample.

2. Connect the

probe to the

meter.

3. Pipet a 50 mL

sample into a

150‑mL beaker.

Stir with a

magnetic stirrer

throughout the

titration.

4. Add titrant in

0.5 to 1 mL

increments.

Record the

potential after

each addition.

Near the end

point, when large

potential changes

are seen, add

increments of 0.1

to 0.2 mL.

Continue the

titration 3 to 4 mL

past the end point.

5. Plot the

electrode potential

versus volume of

added titrant and

fit a smooth curve

through the points.

The end point is

the point of

inflection (the

point of greatest

slope).

6. Calculate the

normality of the

sample, Nx, in

equivalents per

liter:

Nx = (Vt x Nt) / Vx

where:

Nt = normality of

titrant (Eq/L)

Vt = volume of

titrant at end point

(mL)

Vx = Volume of

sample (mL)

Run Check Standard

The Run Check Standard feature validates the instrument performance between sample

measurements. Use the Run Check Standard feature for a periodic or a user-defined

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

standards from the MTC301 probe Settings menu.

Note: Access control must be set to off or a valid password must be used to change the Run Check

Standard options.

1. Push . The Full Access Options menu shows.

2. Select Run Check Standard.

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

3. Use the standard solution shown on the display.

4. Rinse the probe with deionized water. Dry the probe with a no-lint cloth.

5. Put the probe in the standard solution. Make sure that the reference junction is fully in

the standard. Move the probe up or down or lightly shake the probe to remove air

bubbles.

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

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

Passed or Check Standard Failed.

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

the accepted limits. Select Done to continue the sample measurement.

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

limits. A calibration is recommended. Make sure that the limits are set correctly at the

MTC301 probe Settings menu. 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 calibrated again. To correct the probe calibration and status indicator,

calibrate the probe (refer to Calibration on page 3).

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 2.

Table 2 Parameter-specific settings

Setting Options

Measurement Options • Response time

• Upper and lower range limits (defines mV limits per method)

Calibration Options • Standard

• Calibration reminder

• Offset limit

• Standard value (if Custom option is selected)

Check Standards Options • Standard (temperature compensated for ZoBell’s and Light’s solutions)

• Check standard reminder

• Acceptance criteria

• Standard value (at 25 °C if Custom option is selected)

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 MTC301 Settings.

3. Select Modify Current Settings.

4. Select Measurement Options and update the settings:

Option Description

Response Time Sets the response time—

• Fast (2 mV/minute)

• Medium (1 mV/minute) (default)

• Slow (0.5 mV/minute)

The response time affects the speed of the measurement by adjusting the

stabilization criteria.

Measurement

Limits

Sets the measurement limits—Lower limit (default: -1200.0 mV) or Upper

limit (default: 1200.0 mV).

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.

5. 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.

6. 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 MTC301 Settings.

3. Select Modify Current Settings.

4. Select Calibration Options and update the settings:

Option Description

Standard Sets the calibration standard—

• ZoBell’s (221mV – 25 °C)

• Light’s (468mV – 25 °C)

• Custom

Temperature compensated for ZoBell’s solution.

Standard values are shown on the Calibration Options screen.

Light’s solution is characterized at 25 °C.

Custom standard values and temperature are user-defined.

Offset Limits Sets the offset limits—±1 mV to 250 mV (default: ±25 mV).

The offset must fall within set limits for successful calibration.

Standard

Value

When Standard is set to Custom, sets the values for the custom calibration

standard— -1200.00 to 1200.0 mV (default: +221.0 mV). Custom standards

are characterized at 25 °C.

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), 1 d, 7 d or 30 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.

Change check standard options

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

2. Push and select MTC301 Settings.

3. Select Modify Current Settings.

4. Select Check Standards Options and update the settings:

Option Description

Standard Sets the check standard—

• ZoBell’s (221 mV – 25 °C) (default)

• Light’s (135 mV – 25 °C)

• Custom

Temperature compensated for ZoBell’s solution.

Standard value for check standard.

Standard value is shown on Check Standard Options screen.

Lights solution is characterized at 25 °C.

Custom standard values and temperature are user-defined.

Standard

Value

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

arrow keys— -1200.0 to 1200.0 mV (default: 221.0 mV).

The value and temperature for custom check standard are user-defined.

5. Select Check Standard Reminder and update the settings:

Option Description

Reminder Repeat Sets the time interval for the check standard reminder—Off (default), 1 d,

7 d or 30 d.

Allow Defer Allows the postponement of check standard reminders—Yes (default) or

No.

6. Select Acceptance Criteria and update the settings:

Option Description

Acceptance Limits Sets the tolerance limits for check standard—-±1 mV to 25 mV

(default: ±10 mV).

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

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 or slow stabilization time occurs as a result of

contamination on the platinum disc or the probe being left dry for extended periods of

time.

• Measurement values are outside the calibration/measurement range of the probe

even after a calibration is done using freshly prepared standards.

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