Hach MTC10101 Manual de usuario

DOC272.53.80033

User instructions

Gel filled ORP/Redox electrode: Model MTC10101, MTC10103,

MTC10105, MTC10110, MTC10115 or MTC10130

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, if noted on the instrument, will be included

with a danger or caution statement in the manual.

Overview The MTC101 series is a non-refillable, gel-filled combination oxidation reduction potential

(ORP/Redox) electrode with a built in temperature sensor. The MTC10101 or MTC10103

electrode is available with a 1 or 3 meter cable and is intended for laboratory use. The

MTC10105, MTC10110, MTC10115 or MTC10130 electrode is available with a 5, 10, 15 or 30

meter cable and is intended for field use. The electrode gives direct measurements of absolute

mV values in wastewater, drinking water and general applications.

Specifications

Specifications are subject to change without notice.

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 2002/96/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 auxiliary items for proper disposal.

This is the safety alert symbol. Obey all safety messages that follow this symbol to avoid potential injury. If on the

instrument, refer to the instruction manual for operation or safety information.

Specification Details

Electrode type Digital combination electrode with a non-refillable Ag/AgCl reference and a built-in

temperature sensor

Range ± 1200 mV

Resolution 0.1 mV

Temperature accuracy ± 0.3 ºC (± 0.54 ºF)

Operating temperature range 0 to 80 °C

Storage temperature range 5 to 40 °C

Junction Open junction

Reference potential versus

Standard Hydrogen Electrode 207 mV at 25 ºC

Reference type Ag/AgCl (3M KCl)

Minimum sample depth 20 mm

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 meter (3.3 or 9.8 ft). Rugged: Diameter 12 mm (0.47 in.),

Length: 20 mm (0.78 in.), Total length: 220 mm (8.7 in.), Cable length: 5, 10, 15 or 30

meter (16.4, 32.8, 49.2, or 98.4 ft).

Cable connection Digital output and connector compatible with HQd meters

Warranty Sensor is covered by a 6 month warranty.

2DOC272.53.80033

Preparation for use

1. Remove the locking ring and shroud (rugged model).

2. Before first use, remove the tape from the reference junctions and the label from the

electrode body. Refer to Figure 1.

3. Rinse the reference junctions and platinum electrode with deionized water and blot

dry with a lint-free cloth.

4. If the electrode will not be used immediately, fill the storage cap halfway with Hach

Electrode Storage Solution or 3M KCl and install the cap.

5. Install the shroud and locking ring and hand-tighten (rugged model).

Figure 1 Probe overview

1Shroud (rugged model) 5Rugged probe (5, 10, 15 or 30 meter cable)

2Electrode storage cap 6Standard probe (1 or 3 meter cable)

3Platinum electrode and temperature sensor 7Electrode storage cap lid

4Reference junctions and tape 8Locking ring (rugged model)

DOC272.53.80033 3

Calibration

Calibration notes

•Probes are initially calibrated at the factory. However, regular calibration by the user is

recommended for best measurement accuracy.

•Additional standards can be selected in the MTC101 Calibration Options.

•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 - 30 ºC. Light’s solution should be read @ 25 ºC. Custom

ORP/Redox calibration solution values and temperature are user defined.

•The calibration is recorded in the electrode and the data log. The calibration is also

sent to a PC, printer or flash memory stick if connected.

Before calibration:

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

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

use the same calibration options. If the additional HQd meter uses different calibration options (e.g. standard calibration

routine), calibrate the probe or change the method settings/select a different method.

To view the current calibration, select DATA LOG KEY, View Probe Data, then View Current Calibration.

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

option.

ORP/Redox standards should not be diluted. Always use fresh ORP/Redox standard for calibration.

Stir gently. Avoid resting the electrode on the bottom or sides of the container.

Refer to the troubleshooting section for calibration errors (Troubleshooting on page 13).

4DOC272.53.80033

Note: Procedures also apply for rugged model probes.

1. Connect the

electrode to the

meter.

2. Add fresh

ORP/Redox

standard to beaker

or appropriate

container.

3. Select

Calibrate. The

display will show the

required

ORP/Redox

standard solution.

4. Rinse the

electrode with

deionizedwater,blot

dry and place it in

the standard

solution. Make sure

that the sample

level is above the

reference junction.

5. Push Read. Stir

gently. The display

will show

Stabilizing... and a

progress bar as the

probe stabilizes in

the standard.

6. The display will

show the standard

solution value and

the mV offset when

the reading is

stable. Select Done

to view the

calibration

summary.

7. The display will

show the calibration

summary. Select

Store to accept the

calibration and

return to the

measurement

mode.

DOC272.53.80033 5

Run 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

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

the MTC101 settings menu.

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

method options can be changed.

1. Select Run Check Standard from the Meter Options menu.

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

2. Obtain the standard solution specified in the display.

3. Place the electrode in the standard solution and select READ. The display will show

Stabilizing... and a progress bar as the electrode stabilizes in the standard. The

display shows the value of the check standard and either Check Standard Passed or

probe Check Standard Failed.

If the display reads Check Standard Passed, the check standard measurement is

within the accepted limits defined by the administrative user. Select DONE to proceed

with sample measurement.

If the display reads Check Standard Failed, the measurement is outside of accepted

limits defined by the administrative user and a recalibration is suggested. If the

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

calibrate icon with a question mark until the electrode is recalibrated. Recalibrate the

electrode to correct the status indicator (Calibration on page 3).

Measurement

Measurement notes

•Data is stored automatically in the data log when PRESS TO READ or INTERVAL is

selected in the Setup Measurement Mode.

•To significantly reduce the response time for reducing-type samples:

•The platinum disc must be clean and smooth.

•Immerse the platinum disc for 3-10 minutes in Reducing Solution for ORP

Electrodes prior to sample analysis.

•Rinse the electrode with sample, then measure.

Before measurement:

The electrode must have the correct service-life time stamp. Set the date and time in the meter before attaching the

probe.

The probe is factory calibrated and ready for use. For applications that require greater accuracy and precision, verify the

user calibration with check standards or perform a user calibration. Routine calibrations are required (Calibration on page 3).

Make sure that the platinum electrode is clean before sample measurement (Clean the probe on page 9).

If complete traceability is required, enter a sample ID and operator ID before measurement.

Refer to the troubleshooting section for measurement errors (Troubleshooting on page 13).

Stir samples gently during measurement.

When deploying the rugged probe at a distance, toss the cell body with a gentle underhand throw. Swinging the probe by the

cable may cause injury to the user, will cause severe strain on the cable and will shorten the service life of the cell. Damage

under these conditions may not be covered by the product warranty.

6DOC272.53.80033

Note: Procedures also apply for rugged model probes.

1. Prepare the

electrode for use

(Preparation for use

on page 2).

2. Connect the

electrode to the

meter.

3. Rinse the

electrode with the

sample and place

the electrode in

fresh sample.

4. PushRead.The

display will show

Stabilizing... and a

progress bar as the

probe stabilizes in

the sample. If

required by the

application, also

record the sample

pH and

temperature.

5. Repeat steps 3.

and 4. for additional

measurements.

DOC272.53.80033 7

Measurement - conversion to SHE reference

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 Standard potential of reference electrode 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 (refer to

Table 1 Standard potential of reference electrode).

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

the SHE at various temperatures.

Measurement - Oxidation Titrations

Oxidation-reduction, or redox titrations, provide a simple, reliable method for determining

many substances in solution. A redox titration consists of adding to an unknown sample

small increments 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 determined in the

same solution by a single titration with several inflection points.

The following directions represent a general procedure for performing a redox titration

once the sample is prepared for measurement.

Table 1 Standard potential of reference electrode

Temperature (ºC) Electrode Potential in mV (Eref)

80 163.1

75 167.7

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

5220.9

0224.2

8DOC272.53.80033

1. Fill a 10 ml

burette with a

standard titrant

solution with a

normalitythat is5-10

times that of the

sample.

2. Connect the

electrode to the

meter.

3. Pipet a 50 mL

sample into a

150-mL beaker. Stir

with a magnetic

stirrerthroughoutthe

titration.

4. Begin by adding

titrant in 0.5 - 1 mL

increments,

recording the

potential after each

addition. Near the

end point, when

large potential

changesappear,add

increments of 0.1 -

0.2mL. Continuethe

titration 3-4 mL past

the end point.

5. Plot the

electrode potential

versus volume of

addedtitrantandfita

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)

DOC272.53.80033 9

Maintenance Clean the probe if the response time becomes slow (Clean the probe on page 9).

Storage

Note: For optimal performance, the reference junction must not dry out.

Short-term storage:

Store the electrode in Hach Electrode Storage Solution or 3M potassium chloride

(KCl) solution. The electrode can also be stored for up to 2 hours in a sample (if the

sample pH is not extreme).

Long-term storage:

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

2. Fill the electrode storage cap halfway with Hach Electrode Storage Solution or 3M

potassium chloride (KCl) solution.

3. Install the electrode storage cap. Make sure that the storage cap covers the reference

junction completely.

Rugged probe maintenance

The shroud protects the sensor elements during rugged applications. Damage to the

sensing elements can occur if the shroud is not installed during field use. Damage under

these conditions is not covered under warranty.

To remove the shroud:

1. Unscrew the locking ring and slide the shroud and locking ring off the probe.

2. Slide the shroud and locking ring off the probe.

To install the shroud

1. Place the locking ring on the probe body with the threads toward the platinum disc.

2. Slide the shroud on the probe until it is seated in the locking groove.

3. Hand-tighten the locking-ring on the shroud.

Clean the probe

For general cleaning (including oils, greases, and organics):

•Rinse the electrode with deionized water and blot dry with a lint-free cloth.

•Immerse the sensor array and platinum disc in Electrode Cleaning Solution or

warm detergent solution for up to 15 minutes.

Note: The platinum disc can be polished using a soft cloth or cotton swab with detergent

solution.

•Rinse the electrode sensor array and platinum disc with deionized water. Blot dry

with a lint-free cloth.

For inorganic deposits

•Immerse the platinum disc in a solution of 0.1M hydrochloric or nitric acid solution

and soak for up to 15 minutes.

•Rinse the electrode sensor array and platinum disc with deionized water. Blot dry

with a lint-free cloth.

After cleaning has been performed, condition the platinum electrode in

representative sample prior to use.

10 DOC272.53.80033

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.

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 will display to name the method after 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 repeatedly adjusting 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.

1. Make sure an electrode is connected to the meter.

2. Push the METER OPTIONS key and select (MTC101) Settings.

3. Select Modify Current Settings.

4. Select Measurement Options.

5. Update the settings. Refer to Table 3.

Table 2 Parameter-specific settings

Setting Options

Measurement options • Response time

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

Calibration options • Calibration reminder

• Offset limit

Check standard options • Standard (temperature compensated for ZoBell’s solution)

• Check standard reminder

• Acceptance criteria

• Standard value (at 25 ºC if custom standard selected)

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