Milwaukee Mi 150 Manual de usuario

Instruction Manual Mi 150 & Mi 151 Bench Meters

FUNCTIONALDESCRIPTION............................................................................................................ 2

GENERALDESCRIPTION................................................................................................................... 4

SPECIFICATIONS...............................................................................................................................5

OPERATIONALGUIDE...................................................................................................................... 6

pH CALIBRATION.............................................................................................................................. 10

pH BUFFERTEMPERATUREDEPENDENCE........................................................................................ 14

SETUP.................................................................................................................................................14

mVCALIBRATION..............................................................................................................................16

TEMPERATURECALIBRATION............................................................................................................ 16

ELECTRODECONDITIONING & MAINTENANCE............................................................................16

TROUBLESHOOTING....................................................................................................................... 18

ACCESSORIES................................................................................................................................... 19

DISPLAYDISPLAY

DISPLAY

A. MEMORY IN DICATO R

B. RECALL MEMO RY VALUE

C. CALIBRATIO N

D. CO N FIRM

E. SETUP

F. METER WO RKING

G. WAITIN G FO R CALIBRATION

H. WRONG BUFFER

I. UP/ DO WN TEMPERATURE

J. PRE-MEMO RIZED BUFFERS

K. FIRST & SECO ND BUFFER

IN DICATOR

L. MAN UAL TEMPERATURE CO MPEN -

SATION MO DE

M. AUTO MATIC TEMPERATURE

COMPENSATION MODE

N. pH MEASURING UN IT

O . mV MEASURIN G UN IT

P. pH OR mV READING

Q . SELECTED BUFFERS

R. UNIT MEASUREMENT

S. READING TEMPERATURE/ BUFFER

CALIBRATIO N

FUNCTIONALDESCRIPTION

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SPECIFICATIONS

Range -2.00 to 16.00 pH

± 699.9 mV / ± 1999 mV (Mi 151Mi 151

Mi 151Mi 151

Mi 151 only)

-20.0 to 120.0 °C (-4.0 to 248.0 °F)

Resolution ± 0.01 pH

0.1 mV / 1 mV (Mi 151Mi 151

Mi 151Mi 151

Mi 151 only)

0.1 °C (0.1 °F)

Accuracy

(@ 20 °C / 68 °F)

± 0.01 pH

± 0.2 mV / ± 1 mV (Mi 151Mi 151

Mi 151Mi 151

Mi 151 only)

± 0.4 °C (± 0.8 °F)

Typical EMC Deviation ± 0.02 pH

± 0.2 mV / ± 1 mV (Mi 151Mi 151

Mi 151Mi 151

Mi 151 only)

± 0.4 °C (± 0.8 °F)

pH Automatic Calibration 1 or 2 point-calibration, with 7 memorized buffers

Offset Calibration ± 1 pH

Slope Calibration From 80 to 108%

Temperature Compensation Automatic, from -20.0 to 120.0 °C (-4.0 to 248.0 °F)

or manual, without temperature probe

pH Electrode MA 917B/1 (included)

Temperature Probe MA 831R (included)

Input Impedance Impedance 10

ohms

Power supply 12 VDC power adapter

Dimensions 230 x 160 x 95 mm (9.0 x 6.3 x 3.7")

Weight 0.9 kg (2.0 lb.)

Environment 0 to 50 °C ; max RH 95%

Warranty 3 years

OPERATIONALGUIDE

INITIAL PREPARATIO NINITIAL PREPARATIO N

INITIAL PREPARATIO N

Plug the 12 VDC adapter into the power supply socket.

To prepare the instrument for use, connect the pH electrode to the BNC connector and the

temperature probe to the appropriate socket on the rear panel of the instrument. The

temperature probe is used in conjunction with the pH electrode to utilize the instrument's

ATC capability, but it can also be used independently to take temperature measurements.

If the probe is disconnected, temperature can be set manually with the UP and DOWN

arrow keys (see page 3 for details). Install electrode holder and turn the instrument ON by

pressing ON/OFF.

At start up the display will show all the used segments for a few seconds(or while the button

is held), and then will enter normal measurement mode.

After measurement switch the meter off, clean the electrode and store it with a few drops

of MA9015MA9015

MA9015MA9015

MA9015 storage solution in the protection cap.

The auto-off feature turns the meter off after 20 minutes of non-use. To disable this

feature, see SETUPmenu on page 14.

pHpH

pH MEASUREMEN TSMEASUREMENTS

MEASUREMENTSMEASUREMENTS

MEASUREMENTS

To take a pH measurement remove the electrode protective cap and simply submerge the

tip (4cm/ 1½") of the electrode and the temperature probe into the sample to be tested.

If necessary, press the RANGE key (Mi 151Mi 151

Mi 151Mi 151

Mi 151 only) until the display changes to the pH mode.

Allow for the electrode to adjust and reading to stabilize (hourglass symbol turns off).

The LCD will show the measured pH value on the primary LCD and the temperature of the

sample on the secondary LCD.

In order to take more accurate pH measurements, make sure that the instrument is

calibrated (see page 10 for details).

It is recommended that the electrode is always kept wet and rinsed thoroughly with the

sample to be measured before use. The pH reading isdirectly affected by temperature.

Instruction Manual Mi 150 & Mi 151 Bench Meters

In order for the instrument to measure the pH accurately, temperature must be taken into

consideration. If the sample temperature is different from the temperature at which the pH

electrode was kept, allow a few minutes to reach thermal equilibrium.

To use the meter's Automatic Temperature Compensation feature, submerge the tempera-

ture probe into the sample as close to the electrode as possible and wait for a few

seconds.

If manual temperature compensation (MTC) isdesired, the temperature probe must be discon-

nected from the instrument.

The display will show the default temperature of 25 °C or the last temperature set with the

"°C" (or "°F") indicator blinking.

The “MTC” tag and up & down arrows symbols light up on the LCD to indicate that the

instrument is in MTC mode and the arrow keys can be used to enter the desired

temperature value.

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NoteNote

Note: When in MTC the user can press and hold the arrow keys, and the instument will start

incrementing/decrementing the temperature value. The meter keepsmeasuring and

the display is updated every second.

O RP MEASUREMEN TS (MO RP MEASUREMEN TS (M

O RP MEASUREMEN TS (Mi 151 onlyi 151 only

i 151 onlyi 151 only

i 151 only))

))

)

To perform ORPmeasurements, connect an optional ORPelectrode (see "Accessories" section for

code) to the instrument and turn it ON.

If necessary, enter the mV mode by pressing the RANGE key until the display changes

to mV.

Submerge the ORP electrode tip (4 cm/1½") into the sample to be tested and wait a few

minutes for the reading to stabilize.

Measurements within the ± 699.9 mV range are displayed with 0.1 mV resolution, while

outside this range the resolution automatically switches to 1 mV.

The LCD will show the measured mV value on the primary LCD and the temperature of the

sample on the secondary LCD.

The “ATC” (or “MTC”) tag is turned off because mV readings are not temperature

compensated.

For accurate ORP measurements, the surface of the electrode must be clean and smooth.

Pretreatment solutions are available to condition the electrode and improve its response time

(see "Accessories" section).

NotesNotes

Notes:

• When the reading isout of range, the display will flash the closest full-scale value.

• If using pH electrode while in mVmode, the instrument will measure the mVgenerated by the

pH electrode.

Instruction Manual Mi 150 & Mi 151 Bench Meters

MEM & MR FUNCTIO NSMEM & MR FUNCTIO NS

MEM & MR FUNCTIO NS

From normal measurement mode, pressing the MEM key will freeze the readings on the

display and store into internal memory the current values (pH and temperature, or mV and

temperature).

The “MEM” tag blinks and the display remains frozen until the MEM key is pressed again.

N o teN o te

N o te: While in MEM mode, the user can switch between pH and mV by pressing the

RANGE key (Mi 151Mi 151

Mi 151Mi 151

Mi 151 only).

Last stored value can be recalled by pressing the MR key: the LCD will show the value,

together with the “RCL” and “MEM” tags, as long as the MRkey is pressed.

N o teN o te

Note: Pressing MR, only the range that was active at the time MEM was pressed is shown

(Mi 151Mi 151

Mi 151Mi 151

Mi 151 only).

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1 01 0

1 0

pH CALIBRATION

It is recommended to calibrate the instrument frequently, especially if high accuracy is

required.

The pH calibration is also necessary in the following cases:

a) Whenever the pH electrode is replaced.

b) At least once a week.

c) After testing aggressive chemicals.

d) When extreme accuracy is required.

e) When the calibration time out is expired (if feature is enabled).

PRO C ED UREPRO C ED URE

PRO C ED URE

One or two-point calibration can be performed, using 7 pre-memorized buffers (1.68, 4.01,

6.86, 7.01, 9.18, 10.01 and 12.45 pH).

• Pour small quantities of selected buffer solutions into clean beakers. For accurate calibration

use two beakersfor each buffer solution, the first one for rinsing the electrode and the second

one for calibration.

• Remove the protective cap and rinse the electrode with some of the buffer solution to be

used for the first calibration point.

TWO -PO INT CALIBRATIO NTWO -PO INT CALIBRATIO N

TWO -PO INT CALIBRATIO N

• Press the CALkey. The “CAL” and “ ” indicatorswill be displayed. The secondary LCD

will display buffer “7.01”. If a different calibration buffer is desired (i.e. “6.86”), use the

UPand DOWN arrow keys to change the displayed value.

• Submerge the electrode approximately4 cm (1½") into the solution, place the temperature

probe as close to the electrode as possible and stir gently.

• The LCD will flash “NOT READY” for 12 seconds, then:

if the reading isnot close to the selected buffer, “WRONG ” and “WRONG ” will blink

alternatively;

Instruction Manual Mi 150 & Mi 151 Bench Meters

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