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Related Manuals for Accumet AP84
Summary of Contents for Accumet AP84
- Page 2 OPERATING INSTRUCTIONS accumet ® 13636AP84A Portable Waterproof pH/Dissolved Oxygen Meter Printed 1/02...
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Page 3: Table Of Contents
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 — Connecting the probes ...............8-9 4. Calibration ..................10-19 4.1 Important information on meter calibration ..............10 4.2 Preparing the meter for pH calibration ................11 4.3 pH calibration........................12-13 4.4 Preparing the meter for DO calibration................14... - Page 4 8.5 pH mode—Program P4.0: Resetting to factory default settings .........38 8.6 % saturation mode—Program P1.0: Dissolved oxygen parameters Pressure adjustment mode....................39 8.7 % saturation mode—Program P2.0: Offset adjustment..........40 8.8 % saturation mode—Program P3.0: Previous calibration information......41 8.9 % saturation mode—Program P4.0: Electrode properties ...........42 8.10 % saturation mode—Program P5.0: Unit configuration ........43-44 P5.1 READY indicator and auto endpoint function............43 P5.2 Selecting °C or °F temperature readout..............44...
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Page 5: Introduction
1. Introduction Thank you for selecting an accumet AP84 meter. This portable meter is a micro- processor-based instrument that measures pH, dissolved oxygen and temperature. It’s completely waterproof—and it floats! Your meter has many user-friendly features, all of which are accessible through the membrane keypad. -
Page 6: Display And Keypad Functions
2. Display and Keypad Functions Display The LCD has a primary and secondary display. • The primary display shows the measured pH or dissolved oxygen reading. • The secondary display shows the temperature of the reading. The display also shows error messages, keypad functions and program functions. Primary display 12. -
Page 7: Keypad
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. -
Page 8: Preparation
3. Preparation Inserting the Batteries Four AAA batteries are included with your meter. Use a Phillips screwdriver to remove the two screws holding the battery cover. See figure below. Lift off battery cover to expose batteries. Insert batteries. Follow the diagram inside the cover for correct polarity. Replace the battery cover into its original position. -
Page 9: Probe Information - Connecting The Probes
Probe information Your meter uses two probes: • pH electrode with BNC connector • dissolved oxygen/temperature probe with a notched 6-pin connector The temperature sensing element built into the dissolved oxygen probe will also compensate for pH readings as long as both probes are in your solution at the same time. - Page 10 To connect the pH electrode: Slide the BNC connector of the probe over the BNC connector socket on the meter. Make sure the slots of the connector are in line with the posts of the socket. Rotate and push the connector clockwise until it locks. See figure below.
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Page 11: Calibration
4. Calibration Important Information on Meter Calibration When you recalibrate your meter, old calibration points are replaced on a “point by point” basis in pH and completely for % saturation and mg/l (ppm). For example: • pH: if you previously calibrated your meter at pH 4.01, 7.00, and 10.01, and you recalibrate at pH 7.00, the meter retains the old calibration data at pH 4.01 and pH 10.01. -
Page 12: Preparing The Meter For Ph Calibration
Preparing the Meter for pH Calibration Before starting pH calibration, make sure you are in the correct measurement mode. When you switch on the meter, the meter starts up in the units last used. For example, if you shut the meter off in "pH" units, the meter will read "pH" units when you switch the meter on. -
Page 13: Ph Calibration
pH calibration NOTE: We recommend that you perform at least a 2-point calibration using standard buffers that bracket (one above and one below) the expected sample range. You can perform a 1-point calibration, but make sure that the buffer value is close to the sample value you are measuring. - Page 14 Press ENTER to confirm calibration. The meter is now calibrated to the current buffer. READY See figure • If you are performing multipoint calibration, go to step 7. • If you are performing one-point calibration, go to step 9. Rinse the probe with de-ionized water or a rinse solution, and place it in the next pH buffer.
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Page 15: Preparing The Meter For Do Calibration
Preparing the meter for DO calibration Before calibrating your meter, make sure to rinse the DO probe well with de-ionized water or rinse solution. NOTE: Do not let membrane surface of the DO probe touch any other surface. The DO probe guard (the piece with holes fitted over the end of the probe) protects the membrane;... -
Page 16: Dissolved Oxygen Calibration In % Saturation
Dissolved Oxygen calibration in percent saturation You can calibrate this meter quickly and easily in air. The exact calibration value depends on barometric pressure. The meter is set to a factory default of 760 mm Hg, which results in a calibration value of 100% saturation in air. NOTE: If the barometric pressure setting has been changed from 760 mm Hg, the calibration value in air will automatically adjust to a value other than 100%. - Page 17 To calibrate 0 % saturation: Rinse the probe well with deionized rinse water or rinse solution. Do not touch the membrane. Press the MODE key to select the % saturation mode. See figure Place the probe in zero oxygen solution. Stir the probe gently to homogenize the sample.
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Page 18: Dissolved Oxygen Calibration In Mg/L (Ppm) Mode
Dissolved Oxygen calibration in mg/l (ppm) mode Calibrating the meter to 100 % in saturation mode will also calibrate the mg/l mode at the value in mg/l corresponding to 100% saturation. This should produce acceptable results in most applications. This meter also lets you make a calibration adjustment in mg/l (ppm) mode without affecting your % saturation calibration. - Page 19 Notes on mg/l (ppm) mode calibration During mg/l (ppm) calibration, the meter adjusts to the barometric pressure value that is programmed into the meter. It also adjusts to the salinity value that is programmed into the meter. You can change the barometric pressure value and salinity value in the mg/l (ppm) SETUP mode (see pages 47-48 for directions).
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Page 20: Temperature Calibration
Temperature Calibration The built-in temperature sensor included in the DO probe is factory calibrated. Calibrate your sensor only if you suspect sensor drift that may have occurred over a long period of time or if you have a replacement DO probe. Make sure DO probe is attached before you perform the temperature calibration. -
Page 21: Measurement
5. Measurement Taking DO readings During measurement, the probe can be: • fully immersed in the solution • partially immersed in the solution Do not allow the probe’s membrane surface to touch anything! The probe guard (the piece with holes fitted over the end of the probe) protects the membrane;... -
Page 22: Taking Pressure/Salinity Compensated Do Measurements
Taking measurements with READY indicator selected on If the READY indicator has been activated, the READY annunciator lights when the reading is stable. Switch the READY indicator on or off in the SETUP program P5.1 for % saturation measurements (page 43) or program P4.1 (page 51) for mg/l (ppm) measurements. - Page 23 Salinity adjustment NOTE: this mode appears in mg/l (ppm) measurement mode only. Press the Mode key to select mg/l (ppm) mode. Press the SETUP key to enter Set Up mode. See figure Press the ENTER key until the upper display shows a number and the lower display shows “SAL”.
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Page 24: Taking Ph Readings
Taking pH Measurements Be sure to remove the protective rubber cap on the electrode before measurement. To ensure Automatic Temperature Compensation (ATC) for pH measurements, the DO probe must be plugged in and must be immersed into the sample you wish to take pH readings. - Page 25 Taking measurements with READY indicator selected on If the READY indicator has been activated, the READY annunciator lights when the reading is stable. Switch the READY indicator on or off in Set up program P3.1— see page 35 for directions. Taking measurements with the auto endpoint feature selected on When a reading is stable for more than 5 seconds, the auto endpoint feature will automatically “HOLD”...
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Page 26: Manual Temperature Compensation
Manual Temperature Compensation IMPORTANT: For manual compensation, you must disconnect the DO or tempera- ture probe (see page 9). Switch the meter on. Press the MODE key to select pH mode. Press the CAL/MEAS key to enter pH calibration mode. The CAL indicator will appear above the primary display. -
Page 27: Hold Function
6. HOLD function This feature lets you freeze the value of the pH, % saturation or mg/l (ppm) and temperature readings for a delayed MEAS observation. HOLD can be used any HOLD time when in MEAS mode. To hold a measurement, press the HOLD key while in measurement mode. -
Page 28: Backlit Lcd
7. Backlit LCD Using the backlit LCD This feature lets you view readings in low light situations. To activate the backlit LCD feature, press the key to activate. See figure To keep the LCD backlit, keep the key pressed. If the key is not pressed, the backlight automatically shuts off automatically after 20 seconds... -
Page 29: Advanced Setup Functions
8. Advanced SETUP functions The advanced set up mode lets you customize your meter’s preferences and defaults. Your meter features different sub groups that organize all SETUP parameters. This meter displays different subgroups depending on which mode the meter is in: % Saturation mg/l (ppm) dPr: Dissolved oxygen... -
Page 30: Advanced Setup Mode Overview
Advanced SETUP mode detailed overview Press the SETUP key to enter SETUP mode. Press the keys to scroll through sub groups. From the pH measurement mode CAL: Viewing previous calibration data • View previous calibration data Instructions on page 32 ELE: Viewing electrode data •... -
Page 31: Saturation Measurement Mode Overview
From the % saturation measurement mode dPr: Dissolved oxygen parameters • Select Hg or Pa barometric pressure units • Select barometric pressure Instructions on page 39 OFS: % saturation offset adjustment • Set % saturation offset adjustment Instructions on page 40 CAL: Viewing previous calibration data •... -
Page 32: Mg/L (Ppm) Measurement Mode Overview
From the mg/l (ppm) measurement mode dPr: Dissolved oxygen parameters • Select Hg or Pa barometric pressure units • Select barometric pressure • Select salinity adjustment factor Instructions on page 47-48 CAL: Viewing previous calibration data • View previous calibration data, including date/time Instructions on page 49 ELE: Viewing probe data •... -
Page 33: Ph Mode-Program P1.0: Viewing Previous Calibration Data
pH mode—P1.0: Viewing previous calibration data Program P1.0 lets you recall previous calibration data, which helps you know when to recalibrate your meter. This is a “view only” mode. From measurement mode: Press the MODE key to select pH measurement mode. Press the SETUP key to enter SETUP mode. -
Page 34: Ph Mode-Program P2.0: Viewing Electrode Data
pH mode—P2.0: Viewing electrode data Program P2.0 has two “view only”options that lets you check the electrode parame- ters for diagnostic purposes. P2.1: Electrode offset From measurement mode: Press the MODE key to select pH measurement mode. Press the SETUP key to enter Set Up mode. -
Page 35: P2.2 Electrode Slope
P2.2: Electrode slope NOTE: this parameter is available in pH measurement mode only. From measurement mode: If necessary, press the MODE key to select pH measurement mode. Press the SETUP key to enter SETUP mode. Press the keys to scroll through subgroups until you view parameter P2.0. -
Page 36: Ph Mode-Program P3.0: Ph Measurement Configuration
pH mode—P3.0: pH measurement configuration P3.1: READY indicator and auto endpoint function This program lets you select: • “READY indicator on” to indicate when the reading is stable. • “READY indicator off” for faster meter response. • Auto endpoint function on. Select auto endpoint on to “hold” the reading when it is stable for more than 5 seconds. -
Page 37: P3.2 Selecting Number Of Ph Calibration Points
P3.2: Selecting number of pH calibration points Program P3.2 lets you select the number of pH calibration points the meter will use in calibration mode: 2, 3, 4, or 5. The meter will automatically exit calibration mode after you have calibrated to your selected number of points. From measurement mode: Press the MODE key to select pH measurement mode. -
Page 38: P3.3 Selecting °C Or °F
P3.3 Selecting °C or °F This meter lets you select between °C and °F units for temperature readings. From measurement mode: Press the MODE key to select pH measurement mode. Press SETUP key to enter SETUP mode. Press the keys to scroll through subgroups until you view parameter P3.0. -
Page 39: Ph Mode-Program P4.0: Resetting To Factory Default Settings
pH mode—P4.0: Resetting to factory default settings This program lets you reset all pH parameters to factory default settings. This clears all calibration data any other pH setup functions you might have changed. The following settings will remain as you have set them: •... -
Page 40: Saturation Mode-Program P1.0: Dissolved Oxygen Parameters
% saturation mode—P1.0: Dissolved Oxygen Parameters This sub group lets you adjust the barometric pressure Pressure adjustment mode Barometric pressure is vital to correct dissolved oxygen measurements. You need to enter the correct barometric pressure of the area you are measuring. This mode lets you perform two functions: •... -
Page 41: Saturation Mode-Program P2.0: Offset Adjustment
% saturation mode—P2.0: Offset Adjustment Use the offset adjustment to act as an offset at values between 0 and 100%. It is useful to match against end-user standards (i.e. a test kit value). From measurement mode: Press the MODE key to select % saturation mode. -
Page 42: Saturation Mode-Program P3.0: Previous Calibration Information
% saturation mode—P3.0: Previous calibration information This sub group shows you the previous calibration data, along with date and time of calibration. This is a “view only” parameter. In % saturation mode: calibration information is shown in % saturation units. From measurement mode: Press the MODE key to select % saturation mode. -
Page 43: Saturation Mode-Program P4.0: Electrode Properties
% saturation mode—P4.0: Electrode properties These “view only” parameters show the electrode properties for diagnostic purposes: probe slope: shows the calibration slope of the probe. This mode displays slope from 0.5 to 1.999 % of slope (1.0 = 100%). % saturation offset: shows the value of the % saturation offset entered in parameter P2.0 (see page 40 for instructions). -
Page 44: Saturation Mode-Program P5.0: Unit Configuration
% saturation mode—P5.0: Unit configuration 8.10 Unit configuration mode lets you select the following parameters: A. Ready indicator and auto endpoint function B. Temperature in °C or °F P5.1: READY indicator and auto endpoint function The first program lets you select: •... -
Page 45: P5.2 Selecting °C Or °F Temperature Readout
P5.2: Selecting °C or °F temperature readout This meter lets you select between °C and °F units for temperature readings. From measurement mode: Press the MODE key to select the % saturation measurement mode. Press SETUP key to enter SETUP mode. Press the keys to scroll through subgroups until you view parameter P5.0... -
Page 46: Saturation Mode-Program P6.0: Adjusting Lcd Brightness
% saturation mode—P6.0: Adjusting LCD brightness 8.11 This mode lets you adjust the brightness of the backlit LCD. Selecting a dimmer backlighting level helps conserve batteries. From measurement mode: Press the MODE key to select the % saturation measurement mode. Press SETUP key to enter SETUP mode. -
Page 47: Saturation Mode-Program P7.0: Resetting To Factory Default
% saturation mode—P7.0: Resetting to factory default 8.12 settings This program lets you reset all parameters to factory default settings. This clears all calibration data, memory, and any other setup functions you might have changed. The LCD contrast setting will be reset to 8 (the maximum setting). However, the following settings will remain as you have set them: •... -
Page 48: Mg/L (Ppm) Mode-Program P1.0: Dissolved Oxygen Parameters
mg/l (ppm) mode—P1.0: Dissolved Oxygen Parameters 8.13 This sub group lets you adjust the barometric pressure and salinity. P1.1 Pressure adjustment mode Barometric pressure is vital to correct dissolved oxygen measurements. You need to enter the correct barometric pressure of the area you are measuring. This mode lets you perform two functions: •... -
Page 49: P1.2 Salinity Adjustment Mode
P1.2 Salinity adjustment mode Salinity correction mode lets you correct for the variations in oxygen solubility due to salt concentration in the sample. From measurement mode: Press the MODE key to select mg/l (ppm) mode. Press the SETUP key to enter SETUP mode. -
Page 50: Mg/L (Ppm) Mode-Program P2.0: Previous Calibration Information
mg/l (ppm) mode—P2.0: Previous calibration information 8.14 This sub group shows you the previous calibration data, along with date and time of calibration. This is a “view only” parameter. In mg/l (ppm) mode: calibration information is shown in mg/l (ppm) units. From measurement mode: Press the MODE key to select mg/l (ppm) mode. -
Page 51: Mg/L (Ppm) Mode-Program P3.0: Electrode Properties
mg/l (ppm) mode—P3.0: Electrode properties 8.15 These “view only” parameters show the electrode properties for diagnostic purposes: probe slope: shows the calibration slope of the probe. This mode displays slope from 0.5 to 1.999 % of slope (1.0 = 100%). 100% saturation mV value: shows the sensor’s mV output corresponding to 100% saturation. -
Page 52: Mg/L (Ppm) Mode-Program P4.0: Unit Configuration
mg/l (ppm) mode—P4.0: Unit configuration 8.16 Unit configuration mode lets you select the following parameters: A. Ready indicator and auto endpoint function B. mg/l or ppm units C. Temperature in °C or °F P4.1: READY indicator and auto endpoint function The first program lets you select: •... -
Page 53: P4.2 Selecting Mg/L Or Ppm Units
P4.2: Selecting mg/l or ppm units This mode lets you select between mg/l or ppm dissolved oxygen units. From measurement mode: Press the MODE key to select mg/l (ppm) mode. Press SETUP key to enter SETUP mode. Press the keys to scroll through subgroups until you view parameter P4.0 in the lower display. -
Page 54: P4.3 Selecting °C Or °F Temperature Readout
P4.3: Selecting °C or °F temperature readout This meter lets you select between °C and °F units for temperature readings. From measurement mode: Press the MODE key to select mg/l (ppm) mode. Press SETUP key to enter SETUP mode. keys to scroll through Press the subgroups until you view parameter P4.0 in the lower display. -
Page 55: Mg/L (Ppm) Mode-Program P5.0: Adjusting Lcd Brightness
mg/l (ppm) mode——P5.0: Adjusting LCD brightness 8.17 This mode lets you adjust the brightness of the backlit LCD. Selecting a dimmer backlighting level helps conserve batteries. From measurement mode: Press the MODE key to select mg/l (ppm) mode. Press SETUP key to enter SETUP mode. keys to scroll through Press the subgroups until you view parameter P5.0... -
Page 56: Mg/L (Ppm) Mode-Program P6.0: Resetting To Factory Default
mg/l (ppm) mode—P6.0: Resetting to factory default 8.18 settings This program lets you reset all parameters to factory default settings. This clears all calibration data, memory, and any other setup functions you might have changed. The LCD contrast setting will be reset to 8 (the maximum setting). However, the following settings will remain as you have set them: •... -
Page 57: Probe Care And Maintenance
9. Probe Care and Maintenance pH Electrode Care Since your pH electrode is susceptible to dirt and contamination, clean it every one to three months depending on the extent and condition of use. NOTE: for specialty electrode care, consult the instruction manual included with your electrode. -
Page 58: Do Probe Care
Reactivating the pH electrode If stored and cleaned properly, your pH electrode should be ready for immediate use. However, a dehydrated bulb may cause sluggish response. To rehydrate the bulb, immerse the electrode in a pH 4 buffer solution for 10 to 30 minutes. If this fails, you probably need to replace the pH electrode. -
Page 59: Membrane Replacement
DO Membrane Replacement Replacement of the membrane is required only when you cannot calibrate the probe, or if the membrane is damaged. Typical membrane damages are punctures or wrinkles caused during measurements or cleaning. To order replacement probe components or a replacement probe, please contact us. - Page 60 Using the installation tool, unscrew and remove the membrane lock from the Installation tool membrane cap. See figure Remove the membrane and O-ring. Insert notches Discard both. on installation tool into slots on Rinse the membrane cap and membrane lock membrane lock.
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Page 61: Troubleshooting
10. Troubleshooting Problem Cause Solution Power on but a) Batteries not in place. a) Check that batteries are in no display place and making good contact. b) Batteries not in correct b) Reinsert batteries with polarity (+ and –). correct polarity. c) Weak batteries. -
Page 62: Error Messages
11. Error Messages Indicates Cause Solution Display Unrecognized input Wrong input in Release key. Select annunciator from keypad selected mode. valid operations depending on mode. CAL & Err Calibration error Wrong value input Check your input value, annunciators at calibration. clean probe. -
Page 63: Specifications
12. Specifications Mode mg/l (ppm) % saturation Temperature Range -2 to 16 pH 0.00 to 0.0 to 200.0% 0.0 to 50.0°C / 20.00 mg/l (ppm) 32.0 to 122.0°F 0.01 pH 0.01 mg/l (ppm) 0.1% 0.1°C / 0.1°F Resolution Accuracy ±0.01 pH ±1.5% full scale ±1.5% full scale ±0.3°C / ±0.5°F... -
Page 64: Appendix 1: Meter Theory
13. Appendix 1: Meter Theory Dissolved oxygen levels in natural and waste waters depend on the physical, chemical, and biochemical activities in the water body. This meter uses a galvanic probe. It consists of a cell that contains electrolyte and that is enclosed by a selective membrane, and two metallic electrodes. -
Page 65: Appendix 2: Pressure Vs. Altitude Table
14. Appendix 2: Pressure vs. Altitude table Barometric pressure affects DO readings, therefore this meter lets you enter the cor- rect barometric pressure at your altitude. If you do not have equipment that lets you measure the exact barometric pressure at your altitude, you can estimate it using the chart below. -
Page 66: Appendix 3: Factory Default Settings
15. Appendix 3: Factory Default Settings Resetting the meter to factory default settings clears all calibration data and returns other setup functions to the default settings shown in the table below. However, the following settings will remain as you have set them: •...