Corning 445 Instruction Manual
445 pH Meter
Instruction Manual
This manual contains complete instructions for setting up and using
the 445 pH meter. Applications information is also available.
The information contained in this manual was correct at the time of
going to print. However, we continue to improve products and reserve
the right to change specifications, equipment and maintenance
procedures at any time.
This manual is copyrighted, and all rights are reserved. No part of
this manual may be reproduced by any means or in any form without
prior consent in writing.
The power supply unit is classed as IEC Class II equipment
(equipment providing an adequate degree of protection against
electric shocks, in which additional safety precautions, for example,
double or reinforced insulation, are included). The 445 is intended for
use by persons knowledgeable in safe laboratory practices. If the 445
is not used in accordance with these instructions for use, the
protection provided by the equipment may be impaired.
The 445 is suitable for direct current only.
This equipment generates, uses and can radiate radio frequency
energy and if not installed and used in accordance with the
instruction manual, may cause interference with radio
communications. It has been tested and found to comply with the
limits for a Class A computing device pursuant to Subpart J of
Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference when operated in a commercial
environment. Operation of this equipment in a residential area is
likely to cause interference in which case the user at his own expense
will be required to take whatever measures may be required to
correct the interference.
There are no user replaceable parts in the 445 or power supply unit.
Do not remove the covers.
109119-1 Rev. A,11/96
1
Contents
1 Set Up
1.1 Unpacking and Installation ................................................ 4
1.2 Input and Output Connections........................................... 5
1.3 Display and Controls ......................................................... 5
2 Operation
2.1 Calibrating a pH Electrode ............................................... 9
2.2 Measuring Samples......................................................... 10
2.3 Automatic Endpoint (Auto Read)..................................... 10
2.4 Changing the Calibration Buffer Settings........................ 10
2.5 mV Measurements .......................................................... 11
2.5.1 Absolute mV .................................................................... 12
2.5.2 Relative mV ..................................................................... 12
2.6 Temperature Measurements ........................................... 12
2.6.1 Manual Temperature Compensation............................... 13
2.7 Printer .............................................................................. 14
2.8 Changing the Resolution ................................................. 14
2.9 Memory............................................................................ 15
2.10 Setting Time and Date..................................................... 15
2.11 Setting the Timer ............................................................. 16
2.12 Setting High/Low Limits................................................... 17
2.13 Interfacing via the RS232 Output .................................... 17
2.14 Chart Recorder ................................................................ 18
2.15 Karl Fischer Titrations ..................................................... 19
2.16 Replacing the Printer Paper ............................................ 19
2
109119-1 Rev. A, 11/96
Contents (cont)
3 Support Information
3.1 Basic Theory.................................................................... 21
3.2 Operating Hints................................................................ 22
3.3 Maintenance .................................................................... 23
3.3.1 Meter Maintenance.......................................................... 23
3.3.2 Electrode Maintenance.................................................... 23
3.4 Problem Solving .............................................................. 24
3.4.1 Meter Test and Reset...................................................... 24
3.4.2 Meter Error Codes ........................................................... 25
3.4.3 Electrode Problem Solving .............................................. 26
3.5 Specifications .................................................................. 28
Consumables and Accessories ............................... inside rear cover
Warranty .................................................................. inside rear cover
109119-1 Rev. A,11/96
3
1
1.1 Unpacking and Installation
1. The main carton will contain the following:
Meter with a shorting (test) clip in the pH socket
Meter Dust Cover
Power Supply
Printer Paper (3 rolls)
This Instruction Manual
Memo Cards, English, French, German, Italian,
Spanish
Warranty Card
Calibration Certificate
2. If you ordered the meter with an electrode, electrode arm
and accessories, the top tray of the main carton will
contain these items. Refer to the accessories packing sheet
for a list of the additional components.
3. To attach the electrode arm to the pH meter:
a. The electrode arm can be attached to the left or right-
hand side. Using the screwdriver supplied remove the
appropriate end cap from the pH meter.
b. Slide the arm base into the recess and tighten the fixing
screw. Replace the end cap.
c. Fit the electrode arm onto the post. Adjust the tension
screw as required.
electrode arm
arm base
fixing screw
4. Fill in and return the warranty card. For your record make
a note of the serial number, date of purchase and supplier
on the inside front cover of this manual.
4
tension screw
end cap
screwdriver
109119-1 Rev. A, 11/96
1.2 Input and Output Connections
ATC - ATC (automatic temperature
compensation) probe socket
DC - power
supply unit
socket
KF - polarizing
current source
for Karl Fischer
titrations
pH - combination or pH
electrode socket
1
DATA - data
output socket,
see Section 2.13
for interfacing
details
1. Disconnect the shorting clip from the pH socket and retain
it by clipping it over the socket. Connect the electrode. If
you are using an electrode incorporating ATC connect the
other lead to the ATC socket.
2. If you are using a separate ATC probe connect it to the
ATC socket.
3. Connect the power supply unit to the DC socket.
REC - recorder
output socket,
see Section 2.14
for details
REF - reference
electrode socket
1.3 Display and Controls
109119-1 Rev. A,11/96
5
1.3 Display and Controls (cont)
Primary Functions
printer
feed
on/off
Turns the printer on or off, and feeds the
printer paper.
1
mode
alt.
mem
enter
<
buffer
auto
read
on/off
Selects pH, mV or relative mV mode.
Selects secondary function (i.e function shown above
controls).
Enter results into memory. Up to ten results can be
stored and recalled from memory.
Enters value displayed, e.g. when required date is
displayed.
Increases displayed value; used when setting date, time,
hi/lo limits etc. Also changes display resolution.
Decreases displayed value; used when setting date,
<
time, hi/lo limits etc. Also changes display resolution.
Selects calibration buffers.
Selects automatic endpoint detection.
Turns the display off, and places the meter in standby
mode. Wakes the meter up.
cal
read
6
Starts a calibration sequence in pH and relative mV
modes.
Starts sample measurement in all modes. Press again to
freeze display in manual endpoint mode.
109119-1 Rev. A, 11/96
1.3 Display and Controls (cont)
Secondary Functions
°
alt.
mr
Recalls results from memory.
C
Selects manual temperature compensation.
Allows time to be set or changed.
Allows date to be set or changed.
Allows timer interval to be set or changed.
hi
Allows high limit for pH process control to be set or
changed.
Press to select these functions.
time
date
timer
limit
1
lo
limit
Allows low limit for pH process control to be set or
changed.
alt.
The control can also be used with to recall cal data.
Press Allows time, date and % slope value of last
109119-1 Rev. A,11/96
alt.
cal
calibration to be recalled to the printer.
cal
7
1.3 Display and Controls (cont)
set timer
interval
set date
set time
set high limit
set lo limit
1
printer is on
secondary key
function is selected
calibration points
are being set
temperature or
slope value
automatic or manual
temperature compensation
Example pH Reading
slope value
displayed
auto endpoint
is selected
main display
mode
memory number,
buffer number or
error code
calibration buffer
indicator
8
109119-1 Rev. A, 11/96
2.1 Calibrating a pH Electrode
You can recall the time, date and % slope value (if 2- or 3-point
alt.
cal) of the last calibration to the printer by pressing
If you are using an ATC probe (or an electrode incorporating
ATC), the buffer temperature is shown. If you are not using an
ATC probe, enter the temperature of the buffer manually (see
Section 2.6.1).
If you are using auto endpoint the display freezes automatically
when a stable endpoint is reached (see Section 2.3). To manually
cal
freeze the display press
1 point calibration
Place the tip of the electrode in a calibration buffer and
press
At the measurement endpoint the appropriate buffer indicator
appears on the display.
If you are using a standard buffer the display updates to the
temperature corrected value (see Section 2.6).
To return to sample measurement press
2 point calibration
To continue with a 2 point calibration press
Place the tip of the electrode in the next calibration buffer and
continue as before. When the display freezes the electrode slope
value will be displayed in place of the temperature value.
To return to sample measurement press
3 point calibration
To continue with a 3 point calibration press
Place the tip of the electrode in the third calibration buffer and
continue as before. When the display freezes the electrode slope
value will be displayed in place of the temperature value.
cal
read
read
cal
read
cal
2
Press to return to sample measurement.
109119-1 Rev. A,11/96
read
9
2.2 Measuring Samples
NOTE Good laboratory practice dictates that electrodes should
be calibrated at least daily.
2
Place the tip of the electrode in the sample and press to
start the measurement. The decimal point will be
flashing whenever the electrode is reading.
If you are using the 'auto read' function the display freezes
when a stable endpoint is reached (see Section 2.3). To manually
freeze the display when the reading is stable, press
2.3 Automatic Endpoint (Auto Read)
The 'auto read' function checks the electrode output for stability
and automatically freezes the display when the reading appears
stable. It can be used during calibration and routine
measurements.
Turn auto endpoint on by pressing
The auto endpoint indicator will appear at the top right of
the meter display. While the meter is reading, both the 'A' and
the decimal will flash. When the endpoint is reached, both will
stop flashing.
auto
read
read
read
To start another reading press
To cancel auto endpoint press again.
2.4 Changing the Calibration Buffer Settings
The default settings in the meter are for 4.00, 7.00 and 10.01
buffers. The Model 445 will allow you to change these settings to
any buffer values that you wish to work with.
10
read
auto
read
109119-1 Rev. A, 11/96
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