Nova Analytics M 545P Operating manual
M545P
Operating manual
Pinnacle series
6
2
9
4
8
9
p
H
2
°
C
TP
M 545P
Laboratory pH meter
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M 545P
Accuracy when
going to press
Warranty We guarantee the meter described for 3 years from the date of purchase.
The use of advanced technology and the high quality standard of our meters
are the result of a continuous development. This may result in differences
between this operating manual and your meter. Also, we cannot guarantee
that there are absolutely no errors in this manual. Therefore, we are sure you
will understand that we cannot accept any legal claims resulting from the
data, figures or descriptions.
The meter warranty covers manufacturing faults that are discovered within
the warranty period.
The warranty does not cover components that are replaced during
maintenance work, e. g. batteries.
The warranty claim extends to restoring the meter to readiness for use but
not, however, to any further claim for damages. Improper handling or
unauthorized opening of the meter invalidates any warranty claim.
To ascertain the warranty liability, return the meter and proof of purchase
together with the date of purchase freight paid or prepaid.
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M545P
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M545P
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M 545P Contents
M 545P - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 12
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 General operating principles . . . . . . . . . . . . . . . . . . . . . . 18
4.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . 20
4.3.2 Measuring the ORP . . . . . . . . . . . . . . . . . . . . . . 21
4.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.4.1 Calibration interval (Int.C) . . . . . . . . . . . . . . . . . 27
4.4.2 Automatic calibration Automatic Calibration
(AutoCal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.4.3 Conventional calibration (ConCal) . . . . . . . . . . . 31
4.5 Storage in memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.5.1 Manual storage . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.5.2 Automatic storage at intervals . . . . . . . . . . . . . . 35
4.5.3 Downloading the data memory . . . . . . . . . . . . . 37
4.5.4 Erasing the data memory . . . . . . . . . . . . . . . . . . 38
4.5.5 Downloading calibration data . . . . . . . . . . . . . . . 38
4.6 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.6.1 Options for data transmission . . . . . . . . . . . . . . 41
4.6.2 Automatically downloading measurement datasets
at intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.3 Downloading stored measurement datasets . . . 42
4.6.4 Downloading calibration data . . . . . . . . . . . . . . . 42
4.6.5 RS232 interface . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.7 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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Contents M 545P
4.7.1 System settings . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.7.2 Measurement settings . . . . . . . . . . . . . . . . . . . . 47
4.7.3 Interval for automatic storing (AutoStore) . . . 51
4.7.4 Interval for automatic data transmission . . . . . . . 52
4.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.8.1 Resetting calibration values . . . . . . . . . . . . . . . . 53
4.8.2 Resetting meter settings. . . . . . . . . . . . . . . . . . . 54
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 55
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5.1.1 Replacing the batteries. . . . . . . . . . . . . . . . . . . . 55
5.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . 63
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
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M 545P Overview
1Overview
The compact M 545P precision pH meter enables you to perform pH
measurements rapidly and reliably. The M 545P provides the
maximum degree of operating comfort, reliability and measuring
certainty for all applications.
The proven calibration procedures and special AutoRead function (AR)
support your work with the pH meter.
pH
6
9
9
2
2
Pinnacle series
4
M
8
5
4
°
5
C
TP
P
3
2
1 Keypad
2 Display
3 Socket field
1
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Overview M 545P
STO
1.1 Keypad
Pinnacle series
_
_>:
CAL
RCL
Switch the measuring instrument on/off
Call up calibration data
Select measured parameter
Open setting menu for calibration and
measurement
Call up calibration procedure
Call up initialization
MODE AR
STO
In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <OK>) generally indicates a short keystroke
(under 2 sec) in this operating manual. A long keystroke (approx.
2 sec) is indicated by the underscore behind the key symbol (e.g.
<OK
_>).
<On/Off>:
<On/
Off
_>:
<MODE>:
MODE
CAL
<MODE
>:
<CAL>:
<CAL
<AR>:
_>:
AR
STO
RCL
8
<AR
<STO>:
_>:
<STO
<RCL>:
<RCL
_>:
<▲>: Increment values, scroll
Activate / deactivate AutoRead
Set the interval for data transmission
Store measured value
Set the interval for automatic storing
processes
Display / transmit measured values and
calibration records
Erase stored measured values
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M 545P Overview
<▼>: Decrement values, scroll
Function display
indicators
<OK>:
_>:
<OK
1.2 Display
SET
1
Time
Day.Month
Year
AutoCal
LoBat
DIN
SET During calibration: number of the buffer set
BUFFER During calibration: number of the buffer
U pH
8
8
Baud
No.
Ident
88
Auto
BUFFER
8
8
Store
Confirm entries
Open setting menu for system settings
Status display
Sensor symbol
8
8
CalError
ARConCal
%
mV/pH
°F
°
C
RCL
TP
Measured value
display
Function and
temperature display
indicators
AutoCal Calibration with automatic buffer recognition
AutoStore Automatic storing is switched on
CalError An error occurred during calibration
LoBat With battery operation: batteries almost empty
AR AutoRead is active
RCL Memory display / memory download
TP Temperature measurement active
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Overview M 545P
1.3 Socket field
Connectors:
1 pH electrode
2 Reference electrode
3 Temperature sensor
4 Power pack
5 RS 232 interface
Caution
Only connect sensors to the meter that cannot return any voltages
or currents that are not allowed (> SELV and > current circuit with
current limiting).
Almost all customary sensors fulfill these conditions.
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M 545P Safety
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the meter.
Consequently, all responsible personnel must read this operating
manual before working with the meter.
The operating manual must always be available within the
vicinity of the meter.
Target group The meter was developed for work in the laboratory.
Thus, we assume that, as a result of their professional training and
experience, the operators will know the necessary safety precautions
to take when handling chemicals.
Safety instructions Safety instructions in this operating manual are indicated by the
warning symbol (triangle) in the left column. The signal word (e.g.
"Caution") indicates the level of danger:
Further notes
Warning
indicates instructions that must be followed precisely in order to
avoid possibly great dangers to personnel.
Caution
indicates instructions that must be followed precisely in order to
avoid the possibility of slight injuries or damage to the meter or
the environment.
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating
manuals.
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Safety M 545P
2.1 Authorized use
This meter is authorized exclusively for pH and ORP measurements in
the laboratory.
The technical specifications as given in chapter 7 T
ECHNICAL DATA must
be observed. Only the operation and running of the meter according to
the instructions given in this operating manual is authorized.
Any other use is considered unauthorized.
2.2 General safety instructions
This meter is constructed and tested in compliance with the IEC 1010
safety regulations for electronic measuring instruments.
It left the factory in a safe and secure technical condition.
Function and
operational safety
The smooth functioning and operational safety of the meter can only be
guaranteed if the generally applicable safety measures and the specific
safety instructions in this operating manual are followed during
operation.
The smooth functioning and operational safety of the meter can only be
guaranteed under the environmental conditions that are specified in
chapter 7 T
ECHNICAL DATA.
If the meter was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty
functioning of the meter. In this event, wait until the temperature of the
meter reaches room temperature before putting the meter back into
operation.
Caution
The meter is only allowed to be opened by authorized personnel.
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M 545P Safety
Safe operation If safe operation is no longer possible, the meter must be taken out of
service and secured against inadvertent operation!
Safe operation is no longer possible if the meter:
z has been damaged in transport
z has been stored under adverse conditions for a lengthy period of
time
z is visibly damaged
z no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the meter.
Obligations of the
purchaser
The purchaser of this meter must ensure that the following laws and
guidelines are observed when using dangerous substances:
z EEC directives for protective labor legislation
z National protective labor legislation
z Safety regulations
z Safety datasheets of the chemical manufacturers.
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Safety M 545P
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M 545P Commissioning
3 Commissioning
3.1 Scope of delivery
z M 545P laboratory meter
z Power pack
z 4 batteries 1.5 V Mignon type AA
z Stand with stand base
z Operating manual
3.2 Initial commissioning
Perform the following activities:
z Switch on the meter
Switching on the meter
Setting the date and
time
Connecting the power
pack
z Set the date and time
z Connect the power pack (for line power operation only).
1 Switch on the meter with <On/Off>.
A display test is briefly displayed.
2 See section 4.7.1
Caution
The line voltage at the operating site must lie within the input
voltage range of the original power pack (see chapter 7 T
DATA).
ECHNICAL
Caution
Use original power packs only (see chapter 7 TECHNICAL DATA).
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3 Insert the plug into the socket of the pH meter.
4 Connect the original power pack to an easily accessible power
outlet.
Note
You can carry out measurements without the power pack.
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Commissioning M 545P
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M 545P Operation
4 Operation
4.1 Switching on the meter
1 Place the meter on a flat surface and protect it from intense
light and heat.
2 Press the <On/Off>
A display test is briefly displayed.
Subsequently, the meter switches to the measuring mode
(measured value display).
Note
The meter has an energy saving feature to avoid unnecessary battery
depletion during battery operation.
The energy saving feature switches off the meter if no key was pressed
during the specified interval (setting the switch-off interval see section
4.7.1).
The energy saving feature is not active:
z if the power is supplied by the power pack
z if the AutoStore function is active (see section 4.5.2)
z if a PC is connected (with communication cable to RS232 interface)
z if the printer cable is connected (for external printers).
key.
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Operation M 545P
4.2 General operating principles
This section contains basic information on the operation of the M 545P.
4.2.1 Operating modes
The meter has the following operating modes:
z Measurement
The display indicates the measurement data in the measured value
display
z Calibration
The display guides you thru a calibration procedure with calibration
information
z Storage in memory
The meter stores measuring data automatically or manually
z Data transmission
The meter transmits measuring data and calibration records to a
serial interface automatically or manually.
z Configuration
The system menu or a sensor menu with submenus, settings and
functions is displayed
4.2.2 Operation
Keys The meter is operated via keys. The keys can have different functions
with long or short keystrokes.
Functions Generally, with a short keystroke a function is carried out. A long
keystroke opens a setting menu.
In a setting menu, settings are selected with the <▲><▼> keys.
A setting is confirmed with <OK>. With confirming, the setting is
finished and the next setting is displayed.
Representation In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <OK>) generally indicates a short keystroke
(under 2 sec) in this operating manual. A long keystroke (approx.
2 sec) is indicated by the underscore behind the key symbol (e.g.
<OK
_>).
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M 545P Operation
4.3 Measuring
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect an electrode to the meter.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3 Calibrate or check the meter with the electrode.
4 Select the measured parameter with <MODE>.
Note
Incorrect calibration of pH electrodes leads to incorrect measured
values. Calibrate regularly before measuring.
Caution
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as incorrect values would result.
The RS232 interface is not galvanically isolated.
Temperature sensor You can measure with or without a temperature sensor. If a
temperature sensor is connected, it is indicated on the display by TP.
Note
The pH meter automatically recognizes the type of the temperature
sensor used. Therefore, you can connect electrodes with an NTC30 or
Pt1000.
The temperature measurement is absolutely essential for a
reproducible pH measurement. If the measurement is made without a
temperature sensor, proceed as follows:
1 Measure the current temperature using a thermometer.
2 Set the temperature value with <▲><▼>.
Note
When calibrating without temperature sensor, also set the current
temperature of each buffer solution manually with the <▲><▼>
keys.
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Operation M 545P
4.3.1 Measuring the pH value
1 Perform the preparatory activities according to section 4.3.
2 Immerse the pH electrode in the test sample.
3 Using <MODE>, scroll as necessary until the measured
parameter pH is displayed.
pH
AutoRead AR
(drift control)
9
4
2
8
TP
°
C
9
6
2
The AutoRead function (drift control) checks the stability of the
measurement signal. The stability has a considerable effect on the
reproducibility of the measured value.
For identical measurement conditions, the following criteria apply:
Drift within 15 sec < 0.02 pH units.
1 If necessary, call up the measured variable pH with <MODE>.
2With <AR>, activate the AutoRead function.
The AR function display indicator appears.
The current measured value is frozen (hold function).
3 Start measurement with AutoRead with <OK>.
The AR display indicator flashes until a stable value is
measured.
This measured value is downloaded to the interface.
20
4 If necessary, start the next measurement with AutoRead with
<OK>.
5 To terminate the AutoRead function: press the <MODE> or
<AR>
key.
Note
The current measurement with AutoRead can be terminated at any
time (accepting the current value) by pressing <OK>.
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M 545P Operation
4.3.2 Measuring the ORP
The meter can, in conjunction with an ORP electrode, measure the
ORP (mV) of a solution.
1 Perform the preparatory activities according to section 4.3.
2 Immerse the ORP electrode in the test sample.
3 If necessary, call up the measured parameter U with <MODE>.
4 Wait for a stable measured value.
U
°
mV
TP
C
4
8
2
Note
ORP electrodes are not calibrated. However, you can check ORP
electrodes using a test solution.
6
1
3
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Operation M 545P
4.4 Calibration
Why calibrate? pH electrodes age. This changes the zero point (asymmetry) and slope
of the pH electrode. As a result, an inexact measured value is
displayed. Calibration determines the current values of the zero point
and slope of the electrode and stores them in the meter. Thus, you
should calibrate at regular intervals.
When do you have to
calibrate?
AutoCal is adapted to the permanently programmed buffer solutions as a fully
Buffer sets for
calibration
z After connecting another electrode
z When the sensor symbol flashes on the display:
– after the calibration interval has expired
– after a voltage interruption (empty batteries)
automatic single-point, two-point or three-point calibration. The buffer
solutions are automatically recognized by the meter.
You can use the buffer sets quoted in the table for an automatic
calibration. The pH values are valid for the specified temperature
values. The temperature dependence of the pH values is taken into
consideration during the calibration.
No. Buffer set * pH values at
1 Buffers according to DIN 19266 and
NIST Retraceable Buffers
1.679
4.006
25 °C
6.865
9.180
12.454
22
2 Technical buffers 2.000
4.010
7.000
10.011
3 Merck1* 4.000
7.000
9.000
4 Merck2 * 1.000
6.000
8.000
13.000
5 Merck3 * 4.660
6.880
9.220
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25 °C
20°C
20°C
20°C
M 545P Operation
No. Buffer set * pH values at
6 DIN 19267 1 1.090
4.650
6.790
9.230
7 Mettler Toledo USA * 1.679
4.003
7.002
10.013
8 Mettler Toledo TEC * 1.995
4.005
7.002
9.208
9 Fisher * 2.007
4.002
7.004
10.002
10 Fluka BS * 4.006
6.984
8.957
11 Radiometer * 1.678
4.005
7.000
9.180
25 °C
25 °C
25 °C
25 °C
25 °C
25 °C
12 Baker * 4.006
25 °C
6.991
10.008
13 Metrohm * 3.996
25 °C
7.003
8.999
14 Beckman * 4.005
25 °C
7.005
10.013
15 Hamilton Duracal * 4.005
25 °C
7.002
10.013
16 Precisa * 3.996
25 °C
7.003
8.999
* Brand names or trade names are trademarks of their respective owners
protected by law (see page 69).
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