Fisher Scientific accumet AP 110 accumet AP 115accumet AP 125 User manual

®
AP 110
AP 115
AP 125
INSTRUCTION MANUAL
68X452201 Rev. A 07/08

Thank you for selecting an accumet portable (AP)
meter. This portable meter is a microprocessor-based
instrument with many user-friendly features, all of
which are accessible through the keypad. Please read
this manual thoroughly as well as your separate
electrode manual before operating your instrument.
TABLE OF CONTENTS
1. THE INSTRUMENT................................................ 1
1.1 DISPLAY .......................................................... 2
1.2. KEYPAD.......................................................... 3
1.3 CONNECTORS................................................ 4
2. FEATURES ............................................................ 5
3. BATTERY INSTALLATION .................................... 5
4. ELECTRODE USE ................................................. 5
5. pH OPERATION..................................................... 6
5.1 Using setup in pH mode to select options...... 6
5.2 pH Standardization.......................................... 8
5.3 pH Measurement............................................. 8
6. mV OPERATION .................................................... 9
6.1 Using setup in mV mode to select options ..... 9
6.2 mV Measurement.......................................... 10
7. R.mV OPERATION .............................................. 10
7.1 Using setup in R.mV mode to select options 10
7.2 R.mV Standardization ................................... 11
7.3 R.mV Measurement ...................................... 11
8. ION OPERATION (AP125 only) ........................... 12
8.1 Using setup in the Ion mode......................... 12
8.2 Ion Standardization ....................................... 13
8.3 Measurement in Ion mode ............................14
9. MEASURING TEMPERATURE............................. 15
9.1 Temperature Standardization (ATC).............15
9.2 Temperature Standardization (MTC) ............ 16
10. DATA STORAGE ............................................... 17
10.1 Storing Value into Memory............................17
10.2 Recalling Value from Memory....................... 17
11. SPECIFICATIONS .............................................. 18
12. ERROR MESSAGES ......................................... 20
13. REPLACEMENT PARTS & ACCESSORIES ..... 20

1
1. THE INSTRUMENT
Before operating the meter, please familiarize yourself
with the location and function of its various display
elements, keypad and connectors.
Figure 1 Front view of meter

2
1.1 DISPLAY
Figure 2 illustrates the liquid crystal display area. Each
of the display elements is referenced in the figure and
described below.
Figure 2 Display annunciators
SYMBOL DESCRIPTION
Battery indicator with scale
Meter operating with optional AC power supply
Setup Set Up mode
View View data stored in memory
Std In Standardization mode
Meas In Measurement mode
pH pH Measurement mode
R. Relative millivolt Measurement mode
mV Absolute millivolt Measurement mode
ION Ion Measurement mode
STABLE Reading stability indicator
EFF% Slope efficiency in percentage
Clear Clear (erase) data
AUTO Auto-read function ON
MM/DD/YY Month/Date/Year
0C Temperature in Degrees Celsius
ATC Automatic Temperature Compensation
mV Offset in millivolts
Ion
Standards
pH
Buffers
Meter
Prompts

3
1.2. KEYPAD
Figure 3 illustrates the keypad area. The function of
each key is described below.
Figure 3 Meter Keypad
KEY DESCRIPTION
on/off/ ☼
Press to turn the meter ON. The meter will default to
the last measurement mode used.
When ON, press this key to turn the backlight ON or
OFF (to conserve batteries, the backlight is
automatically turned off after 30 seconds).
When ON, press and hold this key for 3 seconds to
turn the meter OFF.
mode
Press this key to toggle between pH, mV, Relative
mV (R.mV) and Ion (AP125 only) measurement
modes.
setup/meas
Press this key to enter Setup menu. Press again to
scroll through the Setup options.
Measure key also serves to refresh value when
Auto-Hold is active.
std/enter
Press this key to activate and confirm the
standardization. Also to confirm selection or change
being made in Setup mode.
save/▲
Press this key to store measured data into memory
(up to 200 data sets). Also to increase value or
make selection in the Setup mode e.g. for date and
time setting scroll up selection.
view/▼
Press this key to recall and select memory location
of stored data. Also to decrease value or make
selection in the Setup mode e.g. for date and time
setting scroll down selection.
mode
view/ ▼
setup/meas
save/▲
std/enter
on/off/

4
1.3 CONNECTORS
Figure 4 illustrates the Top View showing connectors
of the AP meter.
Note that the meter is waterproof only when the
blue rubber plugs and/or the appropriate ATC
probe are used. If the meter is totally submersed,
water may enter the BNC connector. If necessary, dry
the connector to avoid corrosion. Also, If an AC
adapter is connected, the meter is not waterproof.
Figure 4 View of Connectors
The AC jack is used to connect an optional power
adapter. If an AC adapter is not used, Seal the jack
with the blue rubber plug to maintain a waterproof
state. An AC adapter prevents battery drain by
removing the battery from the circuit.
For pH, mV, R.mV, and Ion measurement, attach
combination electrodes with BNC connectors directly
to the middle BNC jack on the meter. Non-
combination (half cell) electrodes can be used with
appropriate adapters sold separately.
For best results, automatic temperature compensation
(ATC) is recommended. Insert the accumet waterproof
ATC connector into the ATC jack. Insert the attached
blue rubber plug if an ATC probe is not used to
maintain a waterproof state.
AC
BNC ATC
TOP

5
2. FEATURES
FEATURE DESCRIPTION
Display
Resolution
Operator-selectable using setup/meas key,
choose 8888.8 for 0.1, 888.88 for 0.01,
88.888 for 0.001
Auto Read
When enabled, display locks on current value
when stable indicator appears. Press meas
key to unlock and resume reading
Battery
Saver
Backlight
When enabled, meter automatically turns off
after 20 minutes of inactivity
To conserve battery life, the backlight
automatically turns OFF after 30 seconds
Slope
Display
View electrode slope and mV offset for
current reading with setup/meas key
Auto-buffer
Recognition
Meter selects from 5 (USA or NIST) or 6
(EURO) pre-programmed standards with
temperature correction of buffer value
Standardi-
zation
User selectable 1-5 cal points for USA/NIST
or 1-6 cal points for EURO standardization.
3. BATTERY INSTALLATION
To install the battery, perform the following steps:
1. Remove the battery cover by loosening the 3
screws that hold the battery cover at the back of
the meter using a Phillips screwdriver.
2. Disconnect the old 9V battery and install new one
into meter battery compartment.
3. Make certain the battery wires are positioned so
that they do not interfere with the closing of the
battery cover. Battery cover edges may damage
the wires.
4. Replace the battery cover and tighten the 3 screws
to secure the cover in place.
4. ELECTRODE USE
This meter can be directly fitted with combination
electrodes, with or without built-in ATC. See
Accessories section for pH/ATC electrodes as well as
adapters for use with half cells.

6
1. Condition your electrode by soaking as needed in
electrode storage solution, pH 4 or 7 buffer, or KCl
solution. Complete hydration can take anywhere
from minutes to overnight for very dry electrodes.
2. Twist the metal shorting cap to remove it from the
BNC jack of the meter. Install your electrode by
twisting it to lock it in place. The shorting cap is
designed to hang freely when the BNC jack is
occupied.
3. Rinse the electrode using clean water and gently
shake dry between measurements. Store in
electrode storage solution, pH 4, pH 7, or KCl
solution. If refillable, keep the fill hole open during
measurement but close for longer periods of non-
use and storage. Refill when the level of fill solution
recedes below the manufacturer’s recommended
level.
Refer to the manufacturer’s electrode instruction
manual for specific details on electrode use.
5. pH OPERATION
5.1 Using setup in pH mode to select options
From the pH Measure screen:
The setup button is a scroll button which allows you to
view and change several operating parameters. While
in setup you may:
•Press mode to return to the Measure screen
without making a change or selection
•Press setup and scroll through the operating
parameters in the meter
•Press enter to accept the parameter as
displayed or to accept a change made to that
parameter and return to the measurement
mode.
1. To activate or de-activate the AUTO hold read
function press setup/meas once. Select AUTO