CORNING 315 User manual

pH
ATC
25.0 °c50
7.000
M
Installation (continued)
Fitting the Wrist Strap
Program Menu
The Program Menu allows you to set a calibration
reminder interval; date and time; manual temp-
erature compensation; pH calibration buffers;
concentration standards; ISE (ion selective
electrode) slope value; isopotential point and
concentration units. You can only enter the
Program Menu if the current measurement has
endpointed.
Press and hold the mode key for 2 seconds to
access the Program Menu - appears.
Press mode to scroll through the options. 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.
The calibration reminder interval can be
set, in hours, between 0 and 9 (where
0␣ = no reminder). When the selected
time has elapsed the calibration reminder
symbol will appear. The 315 has a preset
reminder interval of 1. Change the
interval using ▲and ▼. Press mode to
enter the value and move on.
Time and date are displayed during
calibration recall, and will be sent via 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.
You can enter temperature manually
between –5.0 and 130.0°C. (An ATC
probe will override manual
compensation.) The 315 has a preset
temperature of 25°C. Use ▲and ▼to
change temperature. Press mode to
enter the value and move on.
If you entered the Program Menu from pH mode
(or mV mode), continue with the pH mode
instructions. If you entered from concentration
mode follow the concentration mode instructions
pH mode
You can select three of four pH calibra-
tion buffers. The buffers are grouped in
sets (b␣ = 1, b = 2, b = 3); select your
required set first using ▲and ▼:
set 1 = 7.000, 4.000, 10.010, 1.679
set 2 = 7.000, 4.010, 9.210, 1.679
set 3 = 6.860, 4.010, 9.180, 1.679
Press mode to enter the set and move
on.
electrode
condition
shown here
low batt.
indicator
shown
here
stability/auto
endpoint indicator conc. units
shown here
temperature,
electrode
offset/slope
shown here
memory, cal
and error
number shown
here
MTC
Controls
Press Press & Hold
& Release for 2 Seconds
starts/stops turns auto
measurement endpoint on/off
starts calibration recalls last cal data
for current mode
selects pH/mV/ enters Program Menu
conc/off.
Displays mV and
temperature of
buffer or standard
after calibration.
stores result turns continuous
in memory measurement
(up to 50) on/off
recalls result turns continuous
from memory data transfer
on/off
Display
prog. menu,
cont. read and
data␣ transfer
icons shown
here

Program Menu (continued)
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 1 (factory settings)
cal 1=7.000, cal 2=4.000 and cal 3=10.010
1.679 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.
Concentration mode
You can select one of four preset slope
values for 1 point calibrations (c = 1, c = 2,
c = 3, c = 4). If␣ you are not sure of your
electrode type, or wish to do 2- (3, 4, 5)
point calibrations, do not select a slope as
the 315 will calculate the slope and use this
value rather than the factory setting.
c = 1 -59.2 mV/decade, e.g. for BF4
–, Br –,
Cl–, ClO4
–, F–, I–, NO2 –, NO3 –, SCN–
c = 2 -29.6 mV/decade, e.g. for CO3
2–, S2–
c = 3 +59.2 mV/decade, e.g. for Ag+, H+,
K+, Na+, NH4
+
c = 4 +29.6 mV/decade, e.g. for Ca2+,
Cd2+, Cu2+, Pb2+, WH2+
Select your required slope using ▲and ▼,
press mode to enter the value and move
on.
You can enter the isopotential point (in mV)
of your electrode. The range is –99 to
+99␣ mV. The 315 has a preset isopotential
point of 0 mV. Change the isopotential
point using ▲and ▼, press mode to enter
the value and move on.
You can set five concentration standards to
values of your choice, the range is 0.001 to
19999. For ease of use, set the standards in
the order that you will use them. Set the
values using ▲or ▼, press mode to enter
the value and move on.
For example, to set 500
Press ▲or ▼; the display shows 10000, the
10 will flash.
Press ▲or ▼to change the value to 0000
(no thousands), then press mode to
confirm. The value changes to 000.0, with
the first 0 (‘hundreds’) flashing.
Program Menu (continued)
Press ▲or ▼to change the ‘hundreds’ digit
until the display shows 500.0, then press
mode to confirm. The ‘tens’ digit will flash.
Press mode until the display reads 500.0
with the ‘tenths’ digit flashing, then press
mode again to enter value.
For example, to set 0.5
Press ▲or ▼; the display shows 10000, the
10 will flash.
Press ▲or ▼to change the value to 0000
(no thousands), then press mode to
confirm. The value changes to 000.0, with
the first 0 (‘hundreds’) flashing.
Press mode until the display reads 0.000,
with the ‘tenths’ digit flashing.
Press ▲or ▼to change the ‘tenths’ digit
until the display shows 0.500, then press
mode to confirm. The ‘hundredths’ digit
will flash.
Press mode again, the display reads 0.500
with the ‘thousandths’ digit flashing, press
mode again to enter value.
Select concentration units from the
following list: blank (no units), ppm, mg/g,
mol/L, mmol/L, g/L, mg/L, eq/L, meq/L, %,
ppt. The 315 is preset to blank (no units).
Use ▲or ▼to change units, press mode
to enter the units and move on
Press read to exit the Program Menu.
Buffer Tables
The 315 automatically corrects pH buffers for
temperature using the values shown in the table.
1.679 4.000 4.010 6.860 7.000 9.180 9.210 10.010
5°C 1.668 4.000 4.010 6.950 7.090 9.390 9.450 10.250
10°C 1.670 4.000 4.000 6.920 7.060 9.330 9.380 10.180
15°C 1.672 4.000 4.000 6.900 7.040 9.270 9.320 10.120
20°C 1.675 4.000 4.000 6.880 7.020 9.220 9.260 10.060
25°C 1.679 4.000 4.010 6.860 7.000 9.180 9.210 10.010
30°C 1.683 4.010 4.010 6.850 6.990 9.140 9.160 9.970
35°C 1.688 4.020 4.020 6.840 6.980 9.100 9.110 9.930
40°C 1.694 4.030 4.030 6.810 6.980 9.070 9.060 9.890
45°C 1.700 4.040 4.040 6.830 6.970 9.040 9.030 9.860
50°C 1.707 4.060 4.060 6.830 6.970 9.010 8.990 9.830
cal 1
cal 2
cal 3
c = 1
ISo.Pt.
cal 1 to
cal 5
conc

Calibrating
1. Select pH or conc. mode
2. 1-point calibration
Example
Auto endpoint or
3. Rinse electrode and blot dry
to return to sample measurement, or
continue with step 4 for further cal points
4. 2- (3 pH or 3, 4, 5 concentration) point calibration,
repeat steps 2 and 3 using other buffer/standard
auto or manual endpoint
pH only
95.0 - 105.0% 90.0 - 94.9% 85.0 - 89.9%
electrode in electrode electrode
good condition needs cleaning needs
conditioning
■When you press cal the pH buffer or concentration
standard you selected for cal 1 (Program Menu) is
displayed for 2 seconds, and then the 315 starts
measuring. If you want to use another pH buffer
(choice of 3) or conc. standard (choice of 5) press
cal
again. Press cal repeatedly to exit calibration routine.
■The decimal point flashes during cal measurement.
When the electrode output has stabilized
the␣ stability␣ indicator appears.
Manual endpoint - press
read to endpoint
Auto endpoint - the 315 automatically endpoints.
■When a calibration has endpointed you can press
mode to display the absolute mV value and
temperature of the buffer or standard; the display
reverts to the buffer or standard and E0(pH only)
values, or the buffer or standard and slope values
for␣ a 2-(3, 4, 5) point calibration after 2 seconds.
→
2
seconds
pH
cal1
7.000
cal buffer/standard reminder
pH
ATC cal1
25.0°c
pH
E0mV
cal1
3.2
7.000
7.003
pH
97.2 cal 2
% slope
4.000
buffer or
standard
H2O
Measuring Samples
1. Select pH, mV or concentration mode
2. Measure sample
Example
Auto endpoint or
3. Rinse, blot and store electrode
■If you press mode to select pH, mV or concentration
the 315 begins measuring immediately, and you will
not need to press
read to start the sample
measurement.
■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 315 automatically endpoints.
sample
pH
ATC
25.0°c
pH
ATC
25.0°c
6.840
6.840
H2O

Problem Solving
Err 1 - offset value (E0) 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 in pH mode
Slope less than 85.0%, or not
+ Err 2 calculable.
Electrode needs cleaning,
conditioning or replacing.
Check␣ correct buffers are used.
+ Err 2 Slope more than 105.0%.
Check calibration buffers.
NOTE: Where 0 mV/pH unit = 0%, and
–59.16 mV/pH unit = 100%
Err 2 - slope out of range in concentration mode
Check that for a decade change in concentration,
the mV reading is between +10 to +65 mV, or -10
to –65 mV, depending on the valency and charge
of the species being measured. If it is not, check
the concentration standards and clean, condition
or replace the electrode.
Err 3 - pH buffer outside temperature limits
pH buffers must be between 5°C and 50°C for
accurate temperature compensation.
•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
130.0 - the 315 will not accept values outside this
range.
Dashes displayed instead of buffer or standard
value during calibration buffer or standard set up
- that buffer or standard has already been
selected for a cal point. Cal points must have
different values.
Using the Memory
Entering a Reading into Memory
The 315 can store up to 50 endpointed results.
Press M when the measurement has endpointed.
M 1 is displayed (or M 2 to M 50 if readings have
already been stored).
M 50 indicates the memory is full.
Maintenance
General
The 315 requires 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.
Every six months inspect and lightly grease the
socket seals, and connector and battery ‘O’ rings
with the grease supplied. Replace the ‘O’ rings if
damaged.
CAUTION: To prevent permanent damage care
should be taken to prevent liquid entering the 315
when fitting electrodes or replacing batteries. If it
does, remove the batteries and allow the meter to
dry before using.
Replacing the Batteries
Replace batteries as soon as the low battery
indicator␣ appears. To prevent data loss always
turn the 315 off using the mode key before
replacing the batteries. See the Installation section
for details on installing batteries. Do not mix old
and new batteries.
NOTE: Check the Program Menu settings after
changing the batteries.
Electrode Maintenance
Refer to the electrode product insert for full details
on maintaining your electrode.
Spares and Accessories
476613 Epoxy, 3-in-1 Polymer Gel Electrode (4' cable)
476614 Epoxy, 3-in-1 Refillable Electrode (4' cable)
477269 Replaceable Junctions 3/pk
470444 Rubber Meter Holder and Neck Strap
470464 Mini Electrode Stand
470443 Hard Carrying Case
470445 RS232 Interface Kit
470446 Recorder Cable
470447 Wrist Strap
470448 Instrument Sealing Kit
470449 Neck Strap
470438 Batteries, AA, 4/pk
477989 Guide to pH Measurement
477959 Guide to ISE Measurement
473651 pH 4.00 Buffer Sachets, 30/case
473650 pH 7.00 Buffer Sachets, 30/case
473652 pH 10.01 Buffer Sachets, 30/case
473653 Rinsing Solution Sachets, 30/case
473676 Buffer Sachet, Multi-Pack, 32/case
478540 pH 4.00 Buffer Red, 500 mL, 2/case
478570 pH 7.00 Buffer Yellow, 500 mL, 2/case
478510 pH 10.01 Buffer Blue, 500 mL, 2/case
478574 Rainbow Buffer Pack, 500 mL (2 each of 4.00,
7.00, 10.01) 6/case

Interfacing (continued)
■To use the output to monitor continually, you
need to select continuous measurement
mode and continuous data transfer mode.
Recorder Output
An output is available, via the Recorder Cable
(Cat. 470446), for all 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
approximately 60 mV output/pH unit. This value
varies with changes in electrode slope.
mV - Output follows display, i.e. output varies
from –1999.9 to 1999.9 mV.
Concentration - Output depends on valency and
charge of ionic species being measured, and is
typically approximately ±60 or ±30 mV/decade.
Recorder output is not available for temperature.
315 Data Socket
CAUTION: The 315 does not meet IP67 when the
waterproof output socket seal has been removed.
Operating Hints
■Remove the wetting cap from the end of the
electrode and the rubber cap from the fill hole (if
fitted) before using the electrode.
■Calibrate using buffers or standards 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.
■For greatest accuracy, buffers or standards and
samples should be at the same temperature.
■Do not use solutions after the expiration date.
■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.
■When you select the calibration buffers/
standards (Program Menu), set the buffer or
standard you will use most frequently for 1-point
calibrations as cal 1, the one you will use most
frequently for the second calibration point as cal
2, and so on.
■Calibrate in concentration mode using the units
you want for sample measurement. Changing
the units does not change the reading; e.g. the
315 does not convert from ppm to mmol.
protective ground (0V)
recorder output
Using the Memory (continued)
Recalling Memory
You can only recall stored memories if the current
measurement has endpointed.
Press R - the last stored memory is displayed.
Press ▲␣ or ▼␣ to scroll through memories.
RM␣ 1␣ to RM 50 indicates which memory is being
displayed. M 0 indicates no memories stored.
Clearing the Memories
Press R 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).
Using Continuous
Measurement Mode
In normal mode, the 315 will auto-off 10 minutes
after the last key press, whether the unit is
measuring or has endpointed. If you select
continuous measurement mode, the 315 will not
auto-off.
To select continuous measurement mode press
and hold M for 2 seconds.
Using Continuous
Data Transfer Mode
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 R for 2 seconds.
■If you want to use this mode to monitor
continually, you also need to select
continuous measurement mode.
■To maintain continuity of sample readings
calibration data is not output in continuous
data transfer mode.
Interfacing
Serial Output
The 315 can interface with computers, printers
and other RS232 compatible devices. The RS232
Interface Kit (Cat. 470445) converts data from the
6 pin socket to RS232 format.
Type of communication - uni directional, baud
rate 1200, data format - 1 start bit : 8 data bits :
1␣ stop bit : no parity
■Data is sent to the output socket at measure-
ment endpoint (manual or automatic),
calibration recall and memory recall.