Apera Instruments SX716 User manual

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SX716 Portable Dissolved Oxygen Meter

User Manual

APERA INSTRUMENTS, LLC

aperainst.com

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Table of Contents

1 Brief Instruction ................................................................................................................ - 3 -

2 Technical Specifications .................................................................................................... - 4 -

3 About the Meter ............................................................................................................... - 5 -

4 Dissolved Oxygen .............................................................................................................. - 7 -

4.1 Preparation before use ........................................................................................................... - 7 -

4.2 DO Calibration (Saturated Oxygen) .......................................................................................... - 9 -

4.3 DO Measurement ................................................................................................................... - 9 -

4.4 Notes about DO Measurement ............................................................................................. - 10 -

4.5 DO Electrode Maintenance ................................................................................................... - 10 -

4.6 Zero Oxygen Calibration ........................................................................................................ - 11 -

4.7 Salinity Calibration ................................................................................................................ - 12 -

4.8 Barometric pressure manual compensation .......................................................................... - 12 -

4.9 Parameter Setting ................................................................................................................. - 13 -

5 What’s in the kit ............................................................................................................. - 16 -

6 Warranty ........................................................................................................................ - 16 -

7 Appendix ........................................................................................................................ - 17 -

7.1 Appendix 1 Content of Saturated Oxygen in Water at Different Temperature ........................ - 17 -

7.2 Appendix 2 Content of Saturated Oxygen at Different Barometric pressure ........................... - 18 -

7.3 Appendix 3 Content of Oxygen at Different Altitude .............................................................. - 19 -

Scan the QR code below to watch the tutorial video on Youtube.

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1 Brief Instruction

Thanks for purchasing Apera Instruments SX716 Portable DO Meter (will be called “the

meter” in short in the following content).

Before using the meter, please read this instruction manual carefully in order to help

you properly use and maintain it.

The meter can measure the parameters of DO and temperature of water solutions with

high accuracy. It is the most cost-effective choice of a high-quality portable DO meter. It

is suitable for applications in aquaculture, mining industry, power plants, environmental

monitoring, etc., especially suitable for in-field use.

The meter has the following features:

1.1. Built-in microprocessor chip with the intelligent functions of auto. DO calibration,

auto. temperature compensation, auto. salinity compensation, manual baromatric

pressure compensation, data storage, function settings, auto. power off, and low

voltage display etc.

1.2. Adopts digital filter technology to intelligently improve meter’s response speed and

accuracy. The smiley face icon will appear when the reading is stable.

1.3. Built with a polaragraphic DO electrode with temperature and salinity sensors,

which enables auto. temperature and auto. salinity compensation.

1.4. The polarographic DO electrode has a special electrode calibration sleeve. The

electrode polarization only takes 5 minutes. Electrode adopts a combo-style

membrane cap, which is very convenient to use. Each DO electrode comes with

three backup membrane caps.

1.6. Meter’s LCD screen has clear and bright backlit display.

1.7. Built-tough. IP57 waterproof and dust-proof.

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2 Technical Specifications

2.1 Dissolved Oxygen

Measuring range

(0 to 19.99) mg/L (ppm); (0 to 200.0) %

Resolution

0.1/0.01 mg/L (ppm) 1/0.1%

Accuracy

±0.30 mg/L (ppm), including electrode error

Response time

≤30s (25˚C, 90% response)

Temp. compensation range

(0 to 45) ˚C (automatic)

Salinity compensation range

(0 to 45) ppt (automatic)

Barometric pressure

cocompensation range

(66 to 200) kPa (manual)

Automatic calibration

Air saturated by water; water saturated by air

Electrode type

Polarographic

2.2 Other Technical Parameters

Data storage

100 sets

Data content

Serial number, measuring value, measuring unit,

and temperature

Power Supply

Two AA alkaline batteries (1.5V x2)

Dimensions and weight

Meter: (65×120×31) mm/180g

Carrying case: (255 x 210x 50) mm/790g

Quality and safety certification

CE, ISO 9001:2015

2.3 Working Condition

Working temperature

5 to 35˚C

Working humidity

≤85%

IP rating

IP57 water-resistant

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3 About the Meter

3.1 Screen Display

① —— Parameter icon

② —— Measuring value

③ —— Serial number and icon as measuring value to be stored and recalled and

indication icon for special states.

M+ — measuring value to be stored; RM — Stored value to be recalled;

④ —— Measurement unit

⑤ —— Temperature measuring value and unit

⑥ —— Measurement stabilization icon

⑦ —— Electrode calibration indication icon

⑧ —— Indication icon of low battery power; appears when the voltage is less than 2.6V,

calling attention to replace the batteries.

3.2 Keypad

The meter has 5 operation keys in total.

Short press: press time <1 seconds; Long press: press time >2 seconds

3.2.1. — Power on/off

3.2.2. — Calibration key.

(a) When in measurement mode, press this key to enter calibration mode.

(b) When in parameter setting mode, press this key to make changes.

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3.2.3. — Function key

Press the key to enter the parameter setting mode P1, P2, P3…

3.2.4. — Backlight and confirmation key

(a) When in measurement mode, short press (less than 1.5s) to turn on/off the back

light display.

(b) When in calibration mode or the parameter setting mode, press this key to confirm,

and then the meter enters measurement mode;

when the desired unit appears, release the key to select it.

3.2.5. — The combination key of data logging and recalling

(a) Short press to save the readings, long press to recall the saved readings when in

the measurement mode.

(b) When in the parameter setting mode, press this key to change the number or

ON/OFF state.

3.3 Data Log, Recall and Delete

3.3.1. Save the measurement:

In measurement mode, when the reading is stable and smiley face icon stays on screen,

short-time press key to save the measurement data. M+ icon and the data serial

number will show up on the upper right corner. The meter can store up to 100 sets of

data.

3.3.2. Recall saved data:

(a) In measurement mode, long press the key, the meter will recall the last saved

data and the serial number. RM icon will appear in the upper right corner of the

screen. Short press or key again, the meter will recall all the data in

turn, hold or key to quickly review the data.

(b) In data recalling mode (RM and serial number in the lower right corner of the screen),

press key to return to measurement mode.

3.3.3. Delete the saved data:

In data recalling mode, hold key for 5 seconds, CLr will show up for 2 seconds,

meaning that all the saved data have been eliminated. Then the meter will return to

measurement mode.

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4 Dissolved Oxygen

4.1 Preparation before use

4.1.1. Electrode connection

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4.1.2. Connect the DO electrode. Then Press key to power on the meter.

4.1.3. Choose DO unit: Hold to switch among mg/L, ppm and %. When the desired

unit shows up, release the button to confirm the unit selection.

4.1.4. Check the sponge

Check on the DO500 DO electrode: see picture (4-1). Screw off the bottom lid of electrode

calibration sleeve, inspect whether the sponge inside is moist. If it is dried out, add in several

drops of distilled water to the sponge to maintain the satured air inside the calibration sleeve

(Do NOT add too much water so it won’t be dripping).

4.1.1 Electrode polarization

After each power on, the DO electrode must be polarized for 5 minutes before measuring or

calibration. So do not to turn off the meter in the middle of your DO measurement. Otherwise,

you need to polarize the DO electrode again after next power on (The auto. power off

function in DO mode has been turned off by default).

How to polarize the DO electrode –– Just connect the DO electrode to the powered-on

meter without measuring or calibrating.

Electrode polarization is to consume the remaining oxygen inside the inner solution of the

membrane cap so as to ensure fast response and high accuracy. If a new membrane cap is

replaced, or new inner solution is added, the polarization time should be 30 minutes instead

of 5 minutes.

1 — DO500 DO electrode

2 — Calibration sleeve cap

3 — Calibration sleeve

4 — Water stored sponge

5 — Calibration sleeve bottom lid

6 — Temp er ature elec tr o de

7 — Membrane cap

8 — Cathode (gold)

9 — Anode (silver)

10 — Salinity electrode

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4.2 DO Calibration (Saturated Oxygen)

Power on the meter, press key, the meter enters calibration mode, CAL will be flashing

at the upper-right corner. Insert the DO electrode to the calibration sleeve, and tighten the

sleeve cap. Let the electrode sit for 3 to 5 minutes.

When the reading is fully stabilized, press key again to finish the calibration. A flashing

100% will show up, and the calibration will be finished in several seconds and the meter will

return to measurement mode. If the reading is unstable, please wait for several more

minutes. Do NOT press key until the reading is fully stabilized.

4.3 DO Measurement

4.3.1. Measuring DO in flowing water

Power on the meter. Place the DO electrode into the flowing water. The water surface level

should be higher than the location of the temperature electrode. The angle for the electrode

and water surface should be 45° to 75°. Hold the electrode in the flowing water and wait for

a stable reading, then press to record the measurement. If the reading cannot be

stabilized, keep swirling the electrode slowly in water to help you get a stable reading

(typically takes 1-5 minutes).

4.3.2. Measuring DO in static water

Power on the meter. Place the DO electrode into water. The water surface level should be

higher than the location of the temperature electrode. The angle for the electrode and water

should be 45° to 75°. Keep swirling the electrode in water slowly (>5cm/s) for 1 to 5 minutes.

When the reading is fully stabilized, record the measurement (do NOT stop the swirling while

recording the measurement).

Never stop the DO electrode swirling in static water while measuring. Otherwise the

dissvolved oxygen will be consumed by the DO electrode and the reading will keep dropping.

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4.4 Notes about DO Measurement

a) When calibrating, the environment temperature and water temperature should be

close to each other (≤10˚C). If the difference is large, please dip the electrode into

the sample water for about 10 minutes, then calibrate the electrode according to

Section 4.2.

b) Temperature has a large impact on DO measurement. When the electrode

temperature and water temperature have larger difference, the reading time must be

greater than 3 minutes. Otherwise, there could be some large errors.

c) Salinity and barometric pressure also affect DO measurement. The meter has

automatic salinity compensation and manual barometric pressure compensation. For

details, refer to Section 4.7 and 4.8.

d) When the meter is performing abnormally, please set the mode P7 to be “On” to

restore meter to factory default setting, and then do the calibration again before

measuring.

4.5 DO Electrode Maintenance

4.5.1 Always maintain a moist sponge

Screw off the bottom lid of electrode calibration sleeve (see picture 4-1), inspect whether

the sponge inside is moist. If it is dried out, please add in several drops of distilled water to

the sponge to maintain the satured air inside the calibration sleeve (Do NOT add too much

water so it won’t be dripping).

4.5.2 Remove air bubbles

Inspect the inner solution within the electrode membrane cap. Make sure it doesn’t have air

bubbles. If there are air bubbles, please screw off the membrane cap and add in new inner

solution to remove the bubbles. Then screw the cap back on.

4.5.3 Clean the gold cathode

When the gold cathode is contaminated, use the polishing paper (DO504) to lightly wipe the

gold cathode (along the arc of the gold surface); clean the gold surface with a clean tissue

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