Accumet AP75 User manual
OPERATING INSTRUCTIONS
Printed1/02
MODE
HOLD
ENTER
RANGE
ON
OFF
CAL
MEAS
MI
▲
MR
▼
SETUP
ATC
READY
MEAS
C
µS
IP
67
accumet®13636AP75A
Portable Waterproof
Conductivity Meter
2
Table of Contents
1. Introduction............................................................................................4
2. Display and keypad functions .............................................................5-6
2.1 Display...................................................................................................................................5
2.2 Keypad...................................................................................................................................6
3. Preparation..........................................................................................7-9
3.1 Inserting the batteries..........................................................................................................7
3.2 Probe information ................................................................................................................8
3.3 Connecting the probe to the meter....................................................................................9
4. Calibration.......................................................................................10-16
4.1 Important information on meter calibration .................................................................10
4.2 Preparing the meter for calibration.................................................................................11
4.3 Conductivity calibration..............................................................................................12-13
4.4 TDS calibration..............................................................................................................14-15
4.4.1 Calibrating for TDS directly....................................................................................14
4.4.2 Calibration with conductivity standard and TDS factor....................................15
4.5 Temperature calibration...................................................................................................16
5. Measurement...................................................................................17-22
5.1 Automatic Temperature Compensation (ATC) .............................................................17
5.2 Manual Temperature Compensation.........................................................................18-19
5.3 Taking measurements........................................................................................................20
5.4 Using manual ranging function.......................................................................................21
5.5 Hold function......................................................................................................................22
6. Memory and data input functions..................................................23-24
6.1 Memory input.....................................................................................................................23
6.2 Memory recall.....................................................................................................................24
7. SETUP functions...............................................................................25-40
7.1 Set Up mode overview.................................................................................................26-27
7.2 Program 1.0: Memory clear...............................................................................................28
7.3 Program 2.0: Viewing calibration data............................................................................29
7.4 Program 3.0: Viewing probe data ....................................................................................30
7.5 Program 4.0: Unit configuration.................................................................................31-34
P4.1: READY indicator and auto endpoint function.....................................................31
P4.2: Selecting °C or °F ......................................................................................................32
P4.3 Selecting Automatic or Manual Temperature Compensation.............................33
P4.4 Setting the TDS factor ...............................................................................................34
3
7.6 Program 5.0: Temperature ...........................................................................................35-36
P5.1 Adjusting the temperature coefficient ....................................................................35
P5.2 Adjusting the normalization temperature .............................................................36
7.7 Program 6.0: Selecting the cell constant..........................................................................37
7.8 Program 7.0: Setting the real-time clock....................................................................38-39
7.9 Program 8.0: Resetting to factory defaults.....................................................................40
8. Probe care and maintenance................................................................41
9. Troubleshooting....................................................................................42
10. Error Messages....................................................................................43
11. Specifications......................................................................................44
12. Addendum 1: Calibration tips............................................................45
13. Addendum 2: Conductivity to TDS conversion factors......................46
14: Addendum 3: Calculating TDS Conversion factors ............................47
15. Addendum 4: Calculating temperature coefficients..........................48
16. Addendum 5: Meter factory default settings....................................49
4
1. Introduction
Thank you for selecting an accumet AP75 waterproof portable meter.
• Meter measures conductivity, TDS and temperature.
• Microprocessor-based instrument is completely waterproof—and it floats!
• Meter features a built-in real time clock, expanded memory, and many other user-
friendly features, all of which are accessible through the membrane keypad.
• Meter includes a Ultem/Stainless Steel cell (cell constant K = 1.0) and batteries.
Please read this manual thoroughly before operating your meter.
MODE
HOLD
ENTER
RANGE
ON
OFF
CAL
MEAS
MI
▲
MR
▼
SETUP
ATC
READY
MEAS
C
µS
5
2. Display and Keypad Functions
Display
The LCD has a primary and secondary display.
• The primary display shows the measured conductivity or TDS reading.
• The secondary display shows the temperature of the reading.
The display also shows error messages, keypad functions and program functions.
2.1
Primary display
5.
Secondary display
3.
2.
20.
19.
12.
16.
15. 14.
10.
1.
18.
17.
4.
13.
9.
6.
7. 8.
1. SETup mode indicator
2. MEASurement mode
indicator
3. CALibration indicator
4. MEMory recall mode
indicator
5. millisiemens indicator
6. microsiemens indicator
7. parts per thousand
indicator
8. parts per million
indicator
9. Temperature indicator
10. Automatic
Temperature
Compensation
indicator
11. Clock indicator
12. ERRor indicator
13. MEMory location
indicator
14. Low battery indicator
15. Probe indicator
16. Calibration solution
indicator
16. Function ON/OFF
indicator
17. Cell constant
indicator
18. On/off indicator
19. HOLD indicator
20. READY indicator
11.
6
Keypad
The large membrane keypad makes the instrument easy to use. Each button, when
pressed, has a corresponding graphic indicator on the LCD.
ON/OFF................Powers and shuts off the meter.
HOLD ..................Freezes the measured reading. To activate, press HOLD while in
measurement mode. To release, press HOLD again.
MODE ..................Press to toggle between conductivity, TDS and time
CAL/MEAS..........Toggles user between Calibration and Measurement mode.
NOTE: Temperature calibration is available from conductivity
calibration mode; see page 16 for directions.
ENTER/RANGE..ENTER function: Press to confirm values in Calibration mode
and to confirm selections in Setup mode.
RANGE function: Press to enter manual ranging function.
The MEAS indicator blinks while in manual ranging function.
▲▼
..............Calibration mode: ▲/▼ scrolls through calibration values.
Setup mode: ▲/▼ scrolls through subgroups and program options.
................................MI/MR work in the measurement mode.
MI (memory input) stores the measured value into memory.
MR (memory recall) recalls the sets of values stored in the memory.
SET UP..................Press to enter SETUP mode. SETUP mode lets you customize
meter preferences, view calibration and probe offset data, and
select cell constant.
MI MR
2.2
7
Battery
compartment
Remove these
two screws to
access battery
compartment
3. Preparation
Inserting the Batteries
Four AAA batteries are included with your meter.
1. Use a Phillips screwdriver to remove the two screws holding the battery cover.
See figure below.
2. Lift off battery cover to expose batteries.
3. Insert batteries. Follow the diagram inside the cover for correct polarity.
4. Replace the battery cover into its original position. Screw cover back into place.
3.1
8
Probe information
Your accumet AP75 meter uses a conductivity/
TDS cell with a sturdy 6-pin connector. This cell
is designed for use with accumet waterproof
meters only.
Your meter includes an Ultem/Stainless Steel
cell with a cell constant of K = 1.0. This
conductivity/TDS cell features a built-in tem-
perature sensor for Automatic Temperature
Compensation (ATC). It has a specially
designed housing that provides fast tempera-
ture response and reduces air bubble entrap-
ment, which makes it easy to obtain accurate,
stable readings.
Wetted parts include:
1. Polyetherimide (Ultem)
2. Polybutylterphalate (Valox)
3. Stainless steel (SS 304)
NOTE: We recommend that the you do not sub-
merse the probe above the protective yellow
cap. You can submerse the cable for brief peri-
ods of time, but not continuously.
See section 8 on page 41 for probe care and
maintenance information.
3.2
9
3.3 Connecting the probe to the meter
1. Line up the notch and 6 pins on the meter with the holes in the 6-pin connector.
Push down and turn the locking ring clockwise to lock into place.
See figure below.
2. To remove probe, turn the locking ring counterclockwise on the probe connector.
Pull probe away from the meter.
CAUTION: Do not pull on the probe cord or the probe wires might disconnect.
NOTE: Keep connectors clean. Do not touch connector with soiled hands.
Probe(with 6-pin connector)
locking ring
top view of 6-pin
connector of
temperature probe
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