Instruction Manual
Fisher Scientific accumet® Basic (AB) Benchtop Meters
AB150 ● AB200 ● AB250
68X613601 Rev 0 July 2012
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Table of Contents |
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1. |
Introduction ................................................................................................................ |
3 |
2. |
Keypad & Display....................................................................................................... |
4 |
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Connections: ............................................................................................................................... |
6 |
3. |
System Setup & Configuration ................................................................................. |
7 |
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STABILITY .................................................................................................................................. |
7 |
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EXPORT DATA........................................................................................................................... |
7 |
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DATE & TIME.............................................................................................................................. |
8 |
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PASSWORD ............................................................................................................................... |
8 |
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FACT RESET.............................................................................................................................. |
9 |
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CONTRAST................................................................................................................................. |
9 |
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STIRRER..................................................................................................................................... |
9 |
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SAMPLE ID ................................................................................................................................. |
9 |
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LANGUAGE ................................................................................................................................ |
9 |
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BEEP........................................................................................................................................... |
9 |
4. |
Setup pH & mV........................................................................................................... |
10 |
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BUFFER (pH Only) ..................................................................................................................... |
10 |
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RESOLUTION (pH Only) ............................................................................................................ |
10 |
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ALARM........................................................................................................................................ |
10 |
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STD DUE (pH Only) .................................................................................................................... |
10 |
5. |
pH Standardization (With Preset Buffer Group)...................................................... |
11 |
6. |
pH Standardization (With Custom Buffers) ............................................................. |
12 |
7. |
mV Standardization (Offset Adjustment)................................................................. |
13 |
8. |
Temperature Setup .................................................................................................... |
13 |
9. |
Temperature Standardization ................................................................................... |
14 |
10. Conductivity, TDS, Salinity, & Resistivity Setup..................................................... |
15 |
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STD METHOD (Conductivity Mode Only)................................................................................... |
15 |
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STD POINTS............................................................................................................................... |
15 |
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PURE WAT COEF (Pure Water Coefficient) .............................................................................. |
16 |
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TEMP COEFFICIENT (Linear).................................................................................................... |
16 |
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NORMALIZATION TEMPERATURE (ºC) ................................................................................... |
16 |
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TDS FACTOR (TDS Mode Only) ................................................................................................ |
16 |
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CELL CONST (Cell Constant)..................................................................................................... |
16 |
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ALARM........................................................................................................................................ |
17 |
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STD DUE..................................................................................................................................... |
17 |
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11. |
Conductivity Standardization (Automatic) .............................................................. |
17 |
12. |
Cond/TDS/Salinity/Resistivity Standardization (Manual Adjustment) .................. |
18 |
13. Ion Setup..................................................................................................................... |
20 |
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MEASURE UNIT ......................................................................................................................... |
20 |
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ALARM........................................................................................................................................ |
20 |
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STD DUE..................................................................................................................................... |
20 |
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STANDARDS .............................................................................................................................. |
20 |
14. |
Ion Standardization.................................................................................................... |
21 |
15. |
Viewing, Transferring, and Printing Data ................................................................ |
22 |
16. |
Standardization Report ............................................................................................. |
23 |
17. Troubleshooting......................................................................................................... |
24 |
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18. USB Driver & Boot Loader Documentation ............................................................. |
25 |
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19. |
Specifications............................................................................................................. |
37 |
20. Replacements and Accessories ............................................................................... |
40 |
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21. Warranty ..................................................................................................................... |
42 |
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22. Return of Items........................................................................................................... |
42 |
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23. Notice of Compliance ................................................................................................ |
43 |
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24. |
Declaration of Conformity......................................................................................... |
44 |
2
1. Introduction
Thank you for selecting the Fisher Scientific accumet AB series benchtop meter.
All models include an electrode arm with metal bracket (13-637-671), 110/220 universal power supply (13-636-104), RS-232, and USB cable. The electrode arm can be attached to the left, right, or center of the meter according to your preference using a Phillips screwdriver.
13-637-671 |
13-636-104 |
The AB150 replaces the AB15 and AB15Plus series while the AB200 and AB250 are new introductions to the product line.
Please note that this manual serves three models, so not all sections of the manual are relevant to each model. The chart below lists the parameters served for the various models:
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2. Keypad & Display
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FIXED KEY |
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DESCRIPTION |
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STD |
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to initialize and complete standardization (calibration) of |
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displayed parameter |
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MODE |
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to toggle between available measurement modes |
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SETUP |
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to enter Setup mode; use to change system settings or |
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measurement parameters |
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PRINT / ENTER |
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to print, also to confirm selection during setup |
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SAVE / ▲ |
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to record into memory without printing, also increment |
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VIEW / ▼ |
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to examine saved data, also decrement |
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STIRRER |
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to turn 13-620-BSP stirrer (optional separately) on / off |
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POWER / BACKLIGHT |
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to adjust backlight brightness, also hold >3 seconds to power off |
SOFT KEY |
DESCRIPTION |
HELP |
to view screen specific assistance |
DISPLAY |
to toggle between available display types |
REPORT |
to examine current standardization data such as slope |
TEMP STD |
to initialize temperature standardization (calibration) |
ACCEPT |
to accept existing values |
CLEAR |
to erase existing values |
BACK |
to return to previous screen |
ESC |
to escape or cancel from the current display |
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4 |
Stable
(ATC)
(MTC)
USB port is active.
RS-232 port is active.
Based on the stability speed selected, instrument has detected a stable reading.
Data was sent to the printer; either manually by pressing PRINT key or automatically at timed intervals as entered thru the System Setup mode.
“High Alarm”, “Low Alarm”, or “Std Due” alarm limit had been reached. Note: High/Low alarms also use an audible notification.
Standardization detail.
Measuring Range # of displayed value. Applicable to Conductivity, TDS, Salinity, or Resistivity measurements only.
Automatic Temperature Compensation is active; temperature is being actively acquired with attached electrode. ATC is recommended.
Manual Temperature Compensation is active. This occurs when a temperature sensor may not be attached and the default temperature is used.
See Section 9 – Temperature Standardization to calibrate the ATC or MTC temperature values.
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Connections:
Power |
Power supply, 110/230 VAC, 9 VDC, 18 W, center positive. |
Use only model 13-636-104 (included). |
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RS-232 |
RS-232 serial communication output, 2.5 mm jack. |
For use with RS-232 cable 13-637-681 (included). |
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MINI-B |
USB communication for field software upgrades (cable included) |
USB |
and data output. |
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2/4 Cell |
8-pin DIN connection for 2-cell or 4-cell |
Con/TDS/Resistivity/Salinity/Temperature electrodes. |
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TEMP |
Automatic Temperature Compensation probe (13-620-19) and |
pH electrodes that also include ATC. |
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GROUND |
For electrical grounding / electrical noise reduction. |
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BNC |
For combination pH, mV (ORP, Redox), or |
Ion Selective Electrodes (ISE). Half-cell indicating electrodes |
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require 13-620-489 adapter. |
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3. System Setup & Configuration
Use the System Setup to customize operation of your AB series meter. Press SETUP from the measurement screen and then press PRINT/ENTER when SYSTEM is highlighted to access these settings.
The following settings can be customized for each model:
STABILITY |
STIRRER |
EXPORT DATA |
SAMPLE ID |
COMM SETUP |
LANGUAGE |
DATE & TIME |
BEEP |
PASSWORD |
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FACT RESET |
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CONTRAST |
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STABILITY
Adjust how quickly and frequently the ‘Stable’ indicator appears. There are four levels of adjustment; SLOW, MEDIUM, FAST, or OFF (prevents the Stable indicator from appearing in measurement mode). To display ‘Stable’ more quickly and more often, use “FAST” setting. MEDIUM or SLOW is recommended for most applications.
SLOW: The ‘Stable’ indicator will take longer to appear and will appear less frequently. Use this setting if you want the best results and don’t mind waiting longer to get them.
MEDIUM: This is the factory default setting. It provides a balanced response which works best for most applications.
FAST: The ‘Stable’ indicator will appear quickest of any setting. If you find that the indicator appears and disappears too frequently, you may want to select a slower setting. This setting is often not suitable for use with most non-refillable (gel filled) electrodes which are generally slower to respond.
Tip: Select a lower pH resolution X.XX instead of X.XXX to decrease stabilization time.
EXPORT DATA
Printing: Select ON or OFF.
Datalog: Select ON or OFF.
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Timed: When either printing or datalog is ON, the option to select Timed readings ON or OFF appears. Select “ON” to automatically print or save data at selectable intervals. Select “OFF” to save data manually using the
PRINT/ENTER key.
Time Interval: (MM:SS) (Minutes:Seconds). When timed reading is ON, you must select an interval at which the data will be sent to the Printer and/or Datalog memory. Choose from 3 seconds to 60 minutes. Data will be collected until the data limit is reached or the option is turned “OFF”. This feature is useful for gathering data from a single sample over time. Note that “SAVE” is not available during TIMED setting. To view the stored data, use “VIEW” key.
COMM SETUP (Communication Setup)
Format: To send data as a comma separated value, choose CSV – best for exporting data into spreadsheet software. Choose PRINTER to send the data in an easily viewable format – best for printing.
Communication Setup: Choose RS-232 (9600 or 19200 baud rate) or USB. Baud Rate: When RS-232 is selected, choose (9600 or 19200)
DATE & TIME
Setting the correct date and time is required for GLP and will apply to power on, measurement, data log, and print functions. Factory reset will not apply to date and time setting once it has been set. Changes related to daylight savings time must be manually entered.
Date Format: Select (MM DD YY) or (DD MM YY) Time Format: Select 12Hrs (AM/PM) or 24Hrs
PASSWORD
Select “ENABLE” to restrict access to Calibration and Setup modes. When password protection is enabled, password entry is required before performing any calibration, or making changes to the setup mode. Setup parameters can be viewed, but not changed without correct password entry. The password is a user selectable number from 1 to 99999.
Select “DISABLE” if password protection is not desired.
The meter does not allow you to edit setup parameters or perform a new calibration unless you enter the correct password. If an incorrect password is entered 3 consecutive times, the meter returns to measurement mode.
If a password has been ENABLED but cannot be recovered, a password can be provided via a written request. The instrument serial number and your contact information are required.
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FACT RESET
Select “YES” to reset the to the factory default settings except; Date & Time setting, and data stored into memory.
CONTRAST
Optimize the contrast setting of your display for best visibility in your surrounding lighting conditions. Test various contrast settings for best results. This setting will be applied to both backlight and non-backlight conditions.
STIRRER
Set the stirring speed of the 13-620-BSP Benchtop Stirring Probe (optional accessory) when stirrer is on. Choose from 5 different speeds.
SAMPLE ID
This is a user selectable number from 1 to 99999. Incorporating a sample ID to identify one or more data points is useful to distinguish data that is saved into memory or sent to a PC or printer. Use the ▲/▼ key to adjust the values and ENTER to move the cursor of a previous Sample ID.
LANGUAGE
Select the preferred language that is displayed on the instrument. Choose from English, Deutsch, , Français, Italiano, & Español.
Tip: Check www.fishersci.com/accumet for free instrument software updates which may include additional languages.
BEEP
Enable or disable an audible tone with each key press.
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4. Setup pH & mV
Use Setup pH or mV mode to customize these parameters. Note: mV setup offers Alarm setting only.
Press SETUP from the measurement screen and then press ENTER when pH or mV is selected.
BUFFER (pH Only)
Choose one of (5) pH buffer groups for calibration; The pH values in the selected buffer group are used for auto-recognition during pH calibration. Choose the appropriate buffer group based on the pH calibration standards you intend to use.
Buffer Group |
pH Values |
USA |
2.000, 4.010, 6.997, 10.013, 12.000 |
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NIST |
1.678, 4.010, 6.865, 9.184, 12.460 |
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DIN 19267 |
1.090, 3.060, 4.650, 6.790, 9.230, 12.750 |
FSCI |
1.000, 3.000, 6.000, 8.000, 10.000, 13.000 |
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CUSTOM |
Any 2-5 values, ≥ 1.0 pH unit apart |
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RESOLUTION (pH Only)
Select your desired pH resolution: X.X, X.XX, X.XXX
ALARM
Use a visual and audible alarm to alert you when High or Low values that have been set from this menu are exceeded. “High Alarm” or “Low Alarm” will blink on the display if the values are exceeded while simultaneously, a loud, intermittent beeping sound is heard. The alarms will continue until the conditions are no longer met, and will only be active during measurement mode.
STD DUE (pH Only)
When enabled, the “Cal Due” indicator blinks if the number of days since the last calibration has been exceeded. Set the time from 8 hours, 16 hours, or from 1 to 31 days.
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5. pH Standardization (With Preset Buffer Group)
For best results, periodic standardization (calibration) with known accurate standards is recommended prior to measurement. Use standards that bracket your intended measuring range while including a neutral point (7.00, 6.86, or 6.79). For example, if you expect to measure samples from pH 6.2 to 9.5, calibration with 4.01, 7.00, and 10.01 will work well.
The following pH calibration buffers in the groups listed below are automatically recognized:
Buffer Group |
pH Values |
USA |
2.000, 4.010, 6.997, 10.013, 12.000 |
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NIST |
1.678, 4.010, 6.865, 9.184, 12.460 |
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DIN 19267 |
1.090, 3.060, 4.650, 6.790, 9.230, 12.750 |
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FSCI |
1.000, 3.000, 6.000, 8.000, 10.000, 13.000 |
To eliminate temperature errors associated with the pH electrode, attach the automatic temperature compensation (ATC) probe for best accuracy. Without temperature compensation, pH accuracy will decrease as samples deviate from 25 ºC and pH 7.
If the pH electrode has been stored dry, soak in storage solution for 10 minutes before standardization to saturate the pH electrode surface and minimize drift. If storage solution is not available, use a neutral pH buffer. Do not reuse buffer solutions after calibration.
1)Turn meter on, press MODE if needed for pH measurement mode.
2)Rinse the pH and ATC electrodes with clean water then submerse in your first pH standard buffer.
3)Press STD to enter standardization mode.
If the meter is password protected, you will be prompted to enter a password.
4)The AB meter automatically searches for the appropriate standard from the chosen buffer group in the secondary display. This value will blink when the ‘Stable’ indicator appears. Selecting CLEAR will clear existing calibration values.
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5)Press STD to accept the value of the measured buffer. If successful, the Standardization Report will show the accepted value along with other data. The percentage slope is visible after two or more calibration points have been completed.
6)Repeat Steps 4 & 5 with additional pH buffers.
6. pH Standardization (With Custom Buffers)
Buffer Group |
pH Values |
CUSTOM |
Any 2-5 values, ≥ 1.0 pH unit apart |
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1)Turn meter on, press MODE if needed for pH measurement mode.
2)Rinse the pH and ATC electrodes then submerse in your custom pH buffer – any pH value can be used.
3)Press STD to enter standardization mode. When stable, use ▲/▼ keys to adjust the custom pH buffer value.
For best results, enter the value of the custom buffer that corresponds to the measured temperature. For example, pH
10 buffer is actually 10.06 at 20°C, so the value should be adjusted to 10.06 instead of 10.00 if the temperature is 20°C.
4)Press STD to accept the value.
5)Rinse the pH and ATC electrodes then submerse in next custom pH buffer. Use any pH value that is at least 1.0 pH unit from custom pH standards that have already been calibrated. Press CLEAR to clear existing values – this will be necessary when repeating a standardization using the same buffer value.
6)When stable, use ▲/▼keys to adjust the custom pH buffer value. Previously accepted values will be visible inside of a beaker icon. Press STD to accept the new value. Percentage slope is visible after two or more values have been completed.
7)Repeat Steps 2 thru 4 with additional pH buffers (up to 5 custom buffers) in any order.
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7. mV Standardization (Offset Adjustment)
Oxidization Reduction Potential (ORP or Redox) as measured by an ORP electrode in milliVolt (mV) units is not a precise measurement, but is useful as a relative indicator. As such, mV offset adjustment is not meant to enhance accuracy, but rather to make readings comparable to a reference.
Commercial ORP solutions are commonly used as a check standard – a meter/electrode system is verified to be close to a given value although adjustments are not made. These solutions can be used as a calibration standard in which adjustments are made in an attempt to match the ORP value, however results are often difficult to reproduce.
1)Turn meter on, connect a combination ORP electrode (such as 13-620-81), and press MODE if needed for mV (or R.mV) measurement.
2)Dip the ORP electrode into a solution with a known mV value (i.e. Zobel, Light’s, quinhydrone, or iodidetriiodide) with brief or slow stirring.
3)Press STD to begin standardization.
4)Adjust the value using ▲/▼ keys, press STD when the reading is stable to accept the calibration offset. The maximum adjustable value is ±150 mV from the factory default mV value.
5)To view the Ion Standardization Report at any time from the measure screen, press REPORT.
When an offset has been stored successfully, R.mV replaces mV in measurement mode.
8. Temperature Setup
Use Setup Temperature mode to desired temperature units; ºC or ºF.
Press SETUP from the measurement screen and then press ENTER when
TEMPERATURE is selected. Choose ºC or ºF units of measure.
Automatic Temperature Compensation (ATC) is automatically applied when a temperature sensor is connected.
Manual Temperature Compensation (MTC) of 25 ºC is used if the temperature sensor is not connected. See Section 9 – Temperature Standardization to adjust the MTC temperature value.
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