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Accumet AP74, Operating Instructions Manual, Page: 6 / 48

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5

2. Display and Keypad Functions

Display

The LCD has a primary and secondary display. 

• The primary display shows the measured dissolved oxygen 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. 

6.

Secondary display

3. 

2.

17. 

18. 

16. 

10. 

14.  13. 12. 

8. 

1. 

15.

4.

11.

7. 

1. 

SETup mode indicator

2.

MEASurement mode
indicator

3.

CALibration indicator

4.

MEMory recall mode
indicator

5.

% saturation indicator

6.

Salinity input indicator

7.

Oxygen solubility 
indicators

8.

Temperature 
indicators

9.

Automatic Temperature

Compensation 
indicator

10. 

Clock indicator

11.

ERRor indicator

12.

MEMory location 
indicator

13.

Low battery indicator

14.

Probe indicator

15. 

Calibration data 
indicator

16.

Function ON/OFF
indicator

17.

HOLD indicator

18.

READY indicator

9.

Summary of Contents for AP74

Page 1: ......

Page 2: ...OPERATING INSTRUCTIONS accumet 13636AP74A Portable Waterproof Dissolved Oxygen Meter Printed 1 02 IP 67...

Page 3: ...surement 15 18 5 1 Taking DO readings 15 16 5 2 Taking pressure salinity compensated DO measurements 17 18 6 Hold function 19 7 Memory functions 20 21 7 1 Memory input 20 7 2 Memory recall 21 8 Advanc...

Page 4: ...g C or F temperature readout 34 8 7 Program LCd Adjusting LCD brightness 35 8 8 Program CLO Setting the real time clock 36 37 8 9 Program rST Resetting to factory default settings 38 9 Probe care and...

Page 5: ...at measures 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 Your meter incl...

Page 6: ...y display 3 2 17 18 16 10 14 13 12 8 1 15 4 11 7 1 SETup mode indicator 2 MEASurement mode indicator 3 CALibration indicator 4 MEMory recall mode indicator 5 saturation indicator 6 Salinity input indi...

Page 7: ...e If you were in DO saturation mode press CAL MEAS to enter DO saturation calibration mode If you were in DO mg l ppm mode press CAL MEAS to enter DO mg l ppm calibration mode NOTE Temperature calibra...

Page 8: ...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...

Page 9: ...t touch connector with soiled hands To connect the probe 1 Line up the notch and 6 pins on the top of the meter with the holes in the probe connector Push down and turn the locking ring to lock into p...

Page 10: ...w calibrations automatically override existing calibration data Before calibration Before starting calibration make sure you are in the correct measurement mode When you switch on the meter the meter...

Page 11: ...e See figure 10 4 2 A A B C B C 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...

Page 12: ...the current value of the measurement and the secondary display will show 0 0 See figure 4 Wait for the reading to stabilize If the Ready indicator feature is enabled it will appear when the reading i...

Page 13: ...e See figure 5 Press the CAL key The CAL indicator will appear above the primary display The primary display shows the current value of the measurement and the sec ondary display shows the temperature...

Page 14: ...mmed into the meter It also adjusts to the salinity value that is pro grammed into the meter You can change the barometric pressure value and salinity value in the mg l ppm Set Up mode see pages 27 28...

Page 15: ...e primary display shows the last set temperature reading and the secondary display shows you the factory default temperature value See figure 4 Compare the primary display reading to a NIST traceable...

Page 16: ...se solution 2 Select the appropriate measurement mode Press the MODE key to toggle between modes saturation mg l ppm date time clock 3 Dip the probe into the sample Stir the probe gently to homogenize...

Page 17: ...p program see page 32 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 t...

Page 18: ...Appendix 2 on page 46 for a Pressure vs Altitude table Pressure adjustment 1 Press the SETUP key to enter Set Up mode 2 Press the key once The upper display shows dPr See figure 3 Press the ENTER key...

Page 19: ...ss the key until the upper display shows dPr See figure 4 Press the ENTER key until the upper display shows a number and the lower display shows SAL 5 Use the and keys to enter the salinity of your so...

Page 20: ...ts NOTE This meter shuts off automatically after 20 minutes of nonuse If the meter is shut off either automatically or manually the HOLD value will be lost For longer storage use the memory functions...

Page 21: ...ore up to 50 sets of data in any combination of mg l or ppm readings 7 1 A To store a reading 1 During any measurement function MEAS press the MI key to input any data into the memory 2 MEM Sto and me...

Page 22: ...to the next memory location screen See figure 5 If necessary press the key to select the next memory location screen press the key to select the previous memory location screen 6 Repeat steps 2 5 to r...

Page 23: ...22...

Page 24: ...parameters 3 OFS saturation offset adjustment saturation mode only 4 CAL Calibration data 5 ELE Probe data 6 COF Configuration 7 LCd Backlit display 8 CLO Setting clock 9 rSt Reset meter to factory d...

Page 25: ...quivalent to 0 saturation Instructions on page 26 8 1 COF Unit configuration Ready indicator on or off auto endpoint on or off Select mg l or ppm units Select F or C LCd Backlit display Adjust brightn...

Page 26: ...mV value equivalent to 100 saturation View mV value equivalent to 0 saturation Instructions on page 26 COF Unit configuration Ready indicator on or off auto endpoint on or off Select F or C LCd Backl...

Page 27: ...om measurement mode 1 Press the Set up key to enter Set Up mode 2 Press the and keys to scroll through subgroups until you view parameter Clr in the upper display See figure 3 Press the ENTER key to e...

Page 28: ...til you view parameter dPr in the upper display See figure 3 Press the ENTER key twice The upper display shows either Hg or PA and the lower display shows bAr 4 Press the and keys to toggle between mm...

Page 29: ...er Set Up mode 3 Press the and keys to scroll through subgroups until you view parameter dPr in the upper display See figure 4 Press the ENTER key five times The upper display shows the salinity value...

Page 30: ...o select saturation mode 2 Press the Set up key to enter Set Up mode 3 Press the and keys to scroll through subgroups until you view parameter OFS in the upper display See figure 4 Press the ENTER key...

Page 31: ...a you want to view or mg l ppm 2 Press the Set up key to enter Set Up mode 3 Press the and keys to scroll through subgroups until you view parameter CAL in the upper display See figure 4 Press the ENT...

Page 32: ...y shows the 100 saturation mV value See figure 7 Press the ENTER key The upper display shows the 0 saturation mV value See figure 8 Press the ENTER key to move back to subgroup ELE If you want to retu...

Page 33: ...to measurement mode Notes Meter default is set for Ready indicator on and auto endpoint function off 32 COF Unit configuration Unit configuration mode lets you select the following parameters A Ready...

Page 34: ...ode 2 Press Setup key to enter Set Up mode 3 Press the and keys to scroll through subgroups until you view parameter COF in the upper display See figure 4 Press the ENTER key until dO appears in the u...

Page 35: ...e 2 Press the and keys to scroll through subgroups until you view parameter COF in the upper display See figure 3 Press the ENTER key until C or F appears in the upper display See figure 4 Press the a...

Page 36: ...nd keys to scroll through subgroups until you view parameter LCd in the upper display See figure 3 Press the ENTER key A number 0 8 appears in the upper display and LCd appears in the lower display Se...

Page 37: ...The century digits will flash See figure 4 Press the and keys to toggle to the correct century 5 Press the ENTER key to confirm the century and move to year selection The year digits will flash See fi...

Page 38: ...minute digits will flash See figure 14 Press the and keys to toggle to the correct minutes 15 Press the ENTER key to confirm the minutes and move to second selec tion The second digits will flash See...

Page 39: ...t calibration value the LCD contrast setting the clock setting A B 8 8 From measurement mode 1 Press Setup key to enter Set Up mode 2 Press the and keys to scroll through subgroups until you view para...

Page 40: ...and maintenance will help you receive the maximum probe life and ensure more accurate readings Since any deposits on the membrane surface act as a barrier to oxygen diffusing through the mem brane th...

Page 41: ...nts or cleaning To replace the probe membrane 1 Pull off the probe guard 2 Unscrew the membrane cap from the probe 3 Hold the probe under a water tap and brush away the white oxide on the cylindrical...

Page 42: ...circumference See figure 10 Using the installation tool screw the membrane lock back into the cap Tighten the lock firmly over the membrane and O ring but do not overtighten 11 Inspect the membrane f...

Page 43: ...Fill probe with reference readings in probe electrolyte b Dirty probe b Clean the probe and recalibrate c External noise pickup c Move or switch off or induction caused by interfering motor nearby ele...

Page 44: ...el Need new batteries Clean battery contacts indicator blinks or battery Replace batteries with fresh connection is bad ones noting polarity Err 1 Memory write Hardware failure Turn meter on and off i...

Page 45: ...Hg 66 6 to 199 9 kPa Resolution 1 mm Hg 0 1 kPa Method Key in manually and automatic correction Probe galvanic probe Memory stores and recalls up to 50 points with date time Real time clock stamps cal...

Page 46: ...gen passed through the membrane and produces an electric current in the probe This current is proportional to the partial pressure of oxygen in the sample Since the cathode consumes the oxygen in the...

Page 47: ...factory setting 760 mm Hg the saturation calibration value in air will automatically adjust to a value other than 100 see corrected saturation value column below The adjusted value is correct for the...

Page 48: ...tion Options settings Default Clr Memory clear yes no no dPr Pressure units Hg or Pa Hg Barometric pressure adjust from 500 1499 mm Hg 760 mm Hg Salinity adjustment adjust from 0 50 ppt 0 ppt OFS Set...

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