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3M MP220 Installation Manual

Made by: 3M
Type: Installation Guide
Category: Projector
Pages: 15
Size: 0.18 MB

 

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1

Installation

1. Unpack the meter, power supply, electrode,

electrode arm, buffer sachets, Guide Book and
calibration certificate. Keep the calibration
certificate in a safe place.

2. Check the power supply unit is the correct

voltage for your local supply. If it is not, contact
your distributor.

3. Attach the electrode arm to the left or righthand

side of the meter:
a. Turn the meter upside down and seat the

dome of the electrode arm base into the left
or righthand meter recess.

b. Insert and tighten the fixing screw.
c. Turn the meter and base the right way up

and locate the electrode arm onto the base
fixing post. Press down to snap into place.

Input and Output Connections

MP220 Rear Panel

power supply
unit socket

combination
electrode socket

automatic temperature
compensation probe socket

 


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2

Display

stability/auto endpoint
indicator

electrode
condition
shown
here

prog. menu icons shown
here (and data transfer
icon - MP225 only)

temperature,
electrode
offset/slope
shown here

memory,
cal and
error
number
shown here

automatic or
manual
temperature
compensation
indicator

power supply
unit socket

pH or
combination
electrode socket

data output
socket

recorder output
socket

reference
electrode
socket

Input and Output Connections (continued)

MP225 Rear Panel

1. Disconnect the shorting clip from the 

pH socket

and retain it by clipping it over the socket.

2. Connect the electrode to the 

pH socket. If you

are using an electrode incorporating ATC
connect the other lead to the 

ATC socket.

3. If you are using a separate ATC probe connect it

to the 

ATC socket.

4. Connect the power supply unit to the 

DC socket.

automatic temperature
compensation probe
socket

 


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3

3. Repeat steps 1 and 2 using other buffers for a

2 point (or 3 point - MP225 only) calibration.

Electrode Condition Indicator

95.0 - 105.0%

90.0 - 94.9%

85.0 - 89.9%

electrode in

electrode

electrode

good

needs

needs

condition

cleaning

conditioning

n

When you press 

Cal the pH buffer you selected for

cal 1 (Program Menu) is displayed for 2 seconds, and
then the meter starts measuring. If you want to use
another pH buffer (choice of 3) press 

Cal again. Press

Cal repeatedly to exit the calibration routine.

n

The decimal point flashes during calibration
measurement. When the electrode output
has stabilized the stability indicator appears.
Manual endpoint - press Read to endpoint.
Auto endpoint - the meter automatically endpoints.

n

When a calibration has endpointed you can press
Mode to display the absolute mV value and tempera-
ture of the buffer. The display reverts to the buffer and
E

0

 values, or buffer and slope values for a 2 point (or 3

point - MP225 only) calibration after 2 seconds.

buffer

Calibrating

1. 1-point calibration

Example

Use auto endpoint

or

to freeze the reading.

2. Rinse the electrode and blot dry

to return to sample measurement, or
continue with step 3 for further cal points

↓ 

2 seconds

 


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4

n

If you press 

Mode to select pH or mV mode the meter

begins measuring immediately. You will not need to
press 

Read to start the reading.

n

The decimal point flashes during sample
measurement. When the electrode output
has stabilized the stability indicator appears.
Manual endpoint - press 

Read to endpoint.

Auto endpoint - the meter automatically endpoints.

n

If you have the RS232 cable connected to the 

Data

socket (MP225 only), sample data is transmitted at
endpoint.

Measuring Samples

1. Select pH or mV mode

2. Measure sample

Use auto endpoint

or

to freeze the reading.

3. Rinse, blot and store the electrode.

 


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5

Operating Hints

n

Remove the wetting cap from the end of the
electrode and the rubber cap from the fill hole (if
fitted) before using the electrode.

n

Calibrate using buffers with values that bracket
that of the sample. With a new pH electrode, or
after maintenance, we recommend you use a
buffer close to pH 7 for the first calibration point.

n

For greatest accuracy, buffers and samples
should be at the same temperature.

n

Do not use solutions after the expiry date.

n

When transferring the electrode from one
solution to another, rinse it with distilled water
and blot dry with tissue paper - do not wipe the
electrode as this may cause polarization and
slow response.

n

When you select the calibration buffers
(Program Menu), set the buffer you will use
most frequently for 1-point calibrations as cal 1
and the one you will use most frequently for the
second calibration point as cal 2, and for the
MP225, the one you will use most frequently for
the third calibration point as cal 3.

 


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6

A

A

R

R

R

Using Auto Endpoint

The auto read feature can be used in pH and mV
mode to automatically determine a stable endpoint
during calibrations and sample measurements.

Press    . The display shows the auto endpoint
indicator

. The display will freeze automatically

when a stable endpoint is reached. To manually
freeze the display press 

Read. To turn auto endpoint

off press    again.

Using the Memory

Entering a Reading into Memory

The MP220 can store 10 endpointed results and the
MP225 can store 20.

Press     when the measurement has endpointed.
M 1 is displayed (or M 2 to M 20 if readings have
already been stored).

M  10  (MP220) or M  20  (MP225) indicates the
memory is full.

Recalling Memory

You can only recall stored memories if the current
measurement has endpointed.

Press

- the last stored memory is displayed.

Press

or

to scroll through memories. RM 1 to

RM 20 indicates which memory is being displayed.
M  0   indicates no memories stored.

Clearing the Memories

Press

then press

or

until M C is displayed.

Press 

Mode to clear the memories, M  0  indicates

the memories have been cleared. (Press 

Read to exit

without clearing the memories).

b697

M

M

M

M

 


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7

Using Continuous Data
Transfer Mode 

(MP225 only)

In continuous data transfer mode readings are sent
to the data output approximately every second. If
the measurement endpoints (manually, or using
auto endpoint) data transfer stops. If you recall
memories all stored readings are output, (from the
first to the last stored).

To select continuous data transfer mode press and
hold

for 2 seconds.

n

To maintain continuity of sample readings
calibration data is only output at endpoint.

R

Resetting Sample ID 

(MP225 only)

The sample identity number is sent to the
serial output and increments 1 every time a sample
measurement endpoints.

To reset the sample ID number to 1, press and hold
Read for 2 seconds. The sample ID icon flashes
three times to show the number has been reset.

Recalling Calibration Data 

(MP225 only)

You can only recall calibration data if the current
measurement has endpointed - press 

Read if

necessary.

Press and hold 

Cal for 2 seconds. The display

shows the date and time of the last calibration,
the buffer value, the mV offset (E

0

) for 1-point

calibrations, and the slope value (%) for 2 (3) point
calibrations.

 


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8

MTC

The MP225 has a preset reminder interval
of 1 hour. Change the interval using

and

. Press 

Mode to enter the value and move

on.

Time and Date (MP225 only)

Time and date are displayed during
calibration recall, and will be sent to the
serial output. Time is shown on the main
display, the date is shown on the lower part
of the display. Set the time and date using

and

. Press 

Mode to enter the value

and move on.

Manual Temperature Compensation
(MP220 and MP225)

You can enter temperature manually
between –5.0 and 105.0

°

C. (An ATC probe

will override manual compensation.) The
meters have a preset temperature of 25

°

C.

Use

and

to change temperature. Press

Mode to enter the value and move on.

Program Menu

The Program Menu allows you to set manual
temperature compensation, pH calibration buffers
and, for the MP225 only, calibration reminder and
date and time.
You can only enter the Program Menu if the current
measurement has endpointed - press 

Read if

necessary.
Press and hold the 

Mode key for 2 seconds to

access the Program Menu -

appears.

Press 

Mode to scroll through the options and press

and

to change the value. Press 

Read to exit the

Program Menu at any time. If you press 

Read when a

value is flashing that value will not be entered.

Calibration Reminder (MP225 only)

The calibration reminder interval can be
set, in hours, between 0 and 4 (where
0 = no reminder). When the selected time
has elapsed the calibration reminder
symbol will appear.

M

R

M

R

M

R

M

R

 


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9

cal 1

cal 2

cal 3

Program Menu (continued)

pH Buffer Selection (MP220 and MP225)

The buffers are grouped in sets
(b = 1, b = 2, b = 3); select your required
set first using

and

:

set 1 = 7.00, 4.00, 10.01, 1.68
set 2 = 7.00, 4.01, 9.21, 2.00, 11.00
set 3 = 6.87, 4.01, 9.18, 1.68
Press 

Mode to enter the set and move on.

NOTE: Check buffer set 2 is selected to use
the buffers supplied

Choose three buffers (cal 1, cal 2, cal 3)
from the set for calibration. For ease of
use, set the buffers in the order that you
will use them.

For example: Set 2 (factory settings)

cal 1 = 7.00, cal 2 = 4.01, cal 3 = 9.21
(2.00 and 11.00 not selected).

These can be rearranged in any order using

and

. Press 

Mode to enter the value

and move on.

Press 

Read to exit the Program Menu.

M

R

M

R

b697

 


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10

Interfacing 

(MP225 only)

Serial Output

The MP225 can interface with computers, printers
(GA42), Acquire Data Acquisition software and other
RS232 compatible devices via the RS232 cable. The
maximum source or sink current available is 

±

10mA.

Pin

Signal

Pin

Signal

1

device enable (link to pin 5)

6

not used

2

RS232 Tx (signal transmit)

7

not used

3

not used

8

not used

4

not used

9

not used

5

protective ground (0V)

Data Socket

Type of communication - uni directional, baud rate 2400,
data format - 7 data bits : 1 stop bit : even parity

n

Data is sent to the 

Data socket at measurement

endpoint (manual or automatic), calibration recall and
memory recall.

n

To use the output to monitor continually, you need to
select continuous data transfer mode.

Recorder Output

An output is available for both modes. The polarity
of the output is the same as the polarity of the input
signal.

Approximate Recorder Outputs
pH - Output follows display and provides approxi-
mately 60 mV output/pH unit. This value varies with
changes in electrode slope and temperature.
mV - Output follows display, i.e. output varies from
–1999 to 1999 mV.
Recorder output is not available for temperature.

Rec Socket Polarity

protective
ground (0V)

signal transmit

0V

data output

5

1

9

6

 


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11

Problem Solving

Err 1 - offset value (E

0

) out of range

Check correct buffer is used.
Check mV reading for pH 7 buffer is 0 

±

 30 mV. If it

is not, clean or replace the electrode.

Err 2 - slope out of range

Slope less than 85%, or not calculable.
Electrode needs cleaning, conditioning or
replacing. Check correct buffers are used.

Slope more than 105.0%.
Check calibration buffers.

NOTE: Where 0 mV/pH unit = 0%, and

59.16 mV/pH unit = 100% (at 25

°

C)

Err 3 - pH buffer outside temperature limits
pH buffers must be between 5

°

C and 50

°

C for

accurate calibration.

.

Displayed (out of range)

Check electrode is connected and immersed in
sample. Check wetting cap is removed.

Data Entry Errors

Date flashes and reverts to previous setting - invalid
date entered.

Entered temperature value changes to –5.0 or 105.0
- the meter will not accept values outside this
range.

Dashes displayed instead of buffer value during
calibration buffer set up - that buffer has already
been selected for a cal point. Cal points must have
different values.

 


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12

Maintenance

There are no user replaceable parts in the meters or
power supply unit. Do not remove the covers.

The meters require very little maintenance.
Occasionally wipe the meter with a damp cloth. The
casework is made of ABS/PC which is known to be
affected by some organic solvents, including
toluene, xylene and methyl-ethyl-ketone. It is good
practice to wipe away any spillages as soon as they
occur.

Electrode Maintenance

Refer to the electrode product insert for full details
on maintaining your electrode.

Spares and Accessories

52000100

InLab 413 ‘3 in 1’ pH Electrode

52000118

InLab 410 pH Electrode

51300164

30K

 NTC Probe

51302118

Electrode Arm and Base

51302152

Recorder Cable (MP225 only)

51302125

RS232 Cable (MP225 only)

00229170

GA42 Printer (MP225 only)

00229119

LC - P45 GLP Printer (MP225 only)

51300047

Guide to pH Measurement

51302069

pH 4.01 Buffer Sachets, 30/pack

51302047

pH 7.00 Buffer Sachets, 30/pack

51302070

pH 9.21 Buffer Sachets, 30/pack

51302068

Rainbow Pack Buffer Sachets

(10 each of pH 4.01, 7.00 and 9.21)

51340058

pH 4.01 Buffer Solution, 250 mL x 6

51340060

pH 7.00 Buffer Solution, 250 mL x 6

51300194

pH 9.21 Buffer Solution, 250 mL x 6

c897

 


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13

1.68

2.00

4.00

4.01

6.87

7.00

9.18

9.21

10.01

11.00

5

°

C

1.67

2.02

4.00

4.01

6.95

7.09

9.39

9.45

10.25

11.72

10

°

C

1.67

2.01

4.00

4.00

6.92

7.06

9.33

9.38

10.18

11.54

15

°

C

1.67

2.00

4.00

4.00

6.90

7.04

9.28

9.32

10.12

11.36

20

°

C

1.68

2.00

4.00

4.00

6.88

7.02

9.22

9.26

10.06

11.18

25

°

C

1.68

2.00

4.00

4.01

6.87

7.00

9.18

9.21

10.01

11.00

30

°

C

1.68

1.99

4.01

4.01

6.85

6.99

9.14

9.16

9.97

10.82

35

°

C

1.69

1.99

4.02

4.02

6.84

6.98

9.10

9.11

9.93

10.64

40

°

C

1.69

1.98

4.03

4.03

6.84

6.98

9.07

9.06

9.89

10.46

45

°

C

1.70

1.98

4.04

4.04

6.83

6.97

9.04

9.03

9.86

10.28

50

°

C

1.71

1.98

4.06

4.06

6.83

6.97

9.01

8.99

9.83

10.10

Buffer Tables

The MP220 and MP225 automatically correct pH
buffers for temperature using the values shown in
the table.

b697

 


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14

Specifications

MP220

MP225

Measurement pH

0.00 to 14.00

–2.00 to 16.00

Ranges

mV

±

1999 mV

±

1999 mV

Temp.

-5.0 to 105.0

°

C

–5.0 to 105.0

°

C

Calibration

2 of 3

3 of 3

Points

selectable

selectable

Resolution

pH

0.01

0.01

mV

1

1

Temp.

0.1

0.1

Relative

pH

±

0.01

±

0.01

Accuracy*

mV

±

1 mV

±

1 mV

Temp.

±

0.5

°

C

±

0.2

°

C

Isopotential

pH

7.00

7.00

Point

Outputs

Recorder

Serial

±

 1 least significant digit

MP220

MP225

Memory

10 memories

20 memories

Temp.

–5.0 to 105.0

°

C

–5.0 to 105.0

°

C

Compensation

auto/manual

auto/manual

Display

LCD

LCD

Input Conditions

Impedance

Impedance

>10

12

 ohms

>10

12

 ohms

Operating Conditions

Temperature

5 to 40

°

C

5 to 40

°

C

Humidity at 35

°

C

max. 85%

max. 85%

(non condensing)

Installation Category

2

2

Pollution Category

Degree 2

Degree 2

Size

inches

101/2 x 71/2 x 21/2

101/2 x 71/2 x 21/2

mm

265 x 190 x 65

265 x 190 x 65

Weight

lb

1

3/4

1

3/4

kg

0.8

0.8

b697

 


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15

Specifications (continued)

Power Requirements
The MP220 and MP225 are supplied with an
appropriate power supply unit.
USA/Japan

100 - 120V, 50/60Hz, 0.85VA

Europe

230V, 50Hz, 1.1VA

Output from PSU: 9V DC

Meter Power Rating: 0.3VA

NOTE: The meters should only be used with the
power supply unit supplied.