Apera Instruments DO8500 User manual

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DO8500

Portable Optical Dissolved Oxygen Meter

Instruction Manual

APERA INSTRUMENTS, LLC

www.aperainst.com

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Table of Contents

1. Overview --------------------------------------------------------------------------------------------------

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

3. Instructions -----------------------------------------------------------------------------------------------

3.1 LCD Screen -----------------------------------------------------------------------------------------

3.2 Key Operation --------------------------------------------------------------------------------------

3.3 Batteries ---------------------------------------------------------------------------------------------

3.4 Instrument Socket ---------------------------------------------------------------------------------

3.5 Display Mode ----------------------------------------------------------------------------------------

3.6 Data Storage.recall and clear---------------------------------------------------------------------

3.7 Backlighting ------------------------------------------------------------------------------------------

3.8 Automatic Power-Off ------------------------------------------------------------------------------

4. Optical Dissolved Oxygen Probe -------------------------------------------------------------------

4.1Probe Structure -------------------------------------------------------------------------------------

4.2Probe Maintenance ----------------------------------------------------------------------------------

4.3Sensor Cap ------------------------------------------------------------------------------------------

5. Preparation for Calibration ---------------------------------------------------------------------------

5.1 Dissolved Oxygen Units Selection ------------------------------------------------------------

5.2 Resolution Selection ------------------------------------------------------------------------------

5.3 Temperature Unit Selection ---------------------------------------------------------------------

5.4 Air Pressure Compensation ----------------------------------------------------------------------

5.5 Salinity Compensation-------------------------------------------------------------------------------

6. Calibration ------------------------------------------------------------------------------------------------

6.1 Saturated Oxygen Calibration --------------------------------------------------------------------

6.2 Zero-Oxygen Calibration --------------------------------------------------------------------------

6.3 Special Notes for Calibration ---------------------------------------------------------------------

7. Measurement ----------------------------------------------------------------------------------------------

8. Parameter Settings ---------------------------------------------------------------------------------------

9. USB Communication ------------------------------------------------------------------------------------

10. Complete Kit -----------------------------------------------------------------------------------------------

11. Warranty ----------------------------------------------------------------------------------------------------

12.Trouble Shooting -----------------------------------------------------------------------------------------

Appendix A: Oxygen Solubility Table (760mm Hg)-----------------------------------------------

Appendix B: DO% Calibration Values -------------------------------------------------------------

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1 Overview

Thank you for purchasing Sanxin DO8500 Portable Optical Dissolved Oxygen Meter. The

DO8500 measures dissolved oxygen in water using luminescence technology through an

optical sensor and displays data using advanced intelligent instrument. Compared to

conventional electrochemical dissolved oxygen meter, the DO8500 is more accurate and

stable, easier to use and most cost-effective portable optical dissolved oxygen meter.

Before you use the instrument, please carefully read the instruction manual to help you

properly use and maintain.

1.1 Luminescent optical sensor.

Stability and Accuracy: Oxygen is not consumed during measurements. It is not

affected by sample flow rate and thus provides a stable measurement.

Easy to Use: No electrolytes and membranes are present in the meter; no warm-up;

frequent calibration is not necessary.

Interference-Free: Sensor cap is coated with a light-shielding layer and minimizes the

impact from external light sources. The use of non-chemical sensors helps reduce a

variety of heavy metal ions interference in the aqueous environment, along with H2S

and NH4and other chemical substances.

Long service life. Other than mechanical deterioration (such as scratches to the light

shielding layer), the sensor cap has up to 8000 hours of service life.

Easy to Calibrate and Maintain. Probe is equipped with calibration/storage sleeve,

which makes calibration and maintenance more convenient and reliable.

1.2 Advanced Intelligent Instrument

Built-in microprocessor chip, It`s features up to auto temp compensation, auto air

pressurecompensation, auto salinity compensation and parameter setting.auto power

off, and lower power indication.

Meter meets with the requirement of international GLP standards, clock display,

manual storage and automatic timing storage.USB communication port.

Reading stable and automatic locking modes.

Clear large-size LCD display with white backlight.

Meets IP57 waterproof rating; In addition, a standard instrument suitcase is provided.

Special Notes

Sensor cap surface coating can not withstand high temperatures, so the optical dissolved

oxygen electrode can not test the water of more than 50 ℃.

When the electrode is not in use, it should be kept in the calibration/storage sleeve, and

keep the sponge in moist, so that the fluorescent cap will not dry. If the sponge was dry for

long time or an exposure of the probe for more than 8 hours in dry air, should soak the

electrode in tap water for 24~48 hours and hydration (see article 4.2), otherwise it may

cause unstable measurements or slow response.

Before get readings or do other operations, wait about 30 seconds after meter powered on.

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2 Technical Specifications

Dissolved

Oxygen

Dynamic Range

(0-20.00) mg/L (ppm), (0-200.0)%

Resolution

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

Accuracy

±2% reading or ±0.2mg/L,

whichever is greater

±2% reading or ±2% saturation,

whichever is greater

Response Time

≤30 s (25℃, 90% response)

Calibration Points

Saturation Point & Zero Oxygen

Temperature Compensation

Automatic, (0 to 50)℃

Pressure Compensation

Automatic, (60 to 120) kPa

Salinity Compensation

Manual or automatic, (0 to 45) ppt

Temperature

Range

(0 to 50.0)℃

Resolution

0.1 ℃

Accuracy

±0.5℃

Other

Data Storage

500 groups (with time and date)

Output

USB

Batteries

AA x 3 (1.5V×3)

IP Rating

IP57

Dimensions and Weight

Meter: 88×170×33 mm/313g

With case: 360×270×76 mm/1.3kg

Product Certificate

RoHs, CE & ISO9001:2008

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3 Instructions

3.1 LCD Screen

①

Measurement mode icon

⑨

Serial number of storage and

prompts of special display mode

②

Reading/Measured Value

⑩

M+ —Measurement to be stored icon

RM —Reading to be recalled icon

③

Timing storage icon

⑪

Temperature value and

prompts of special display mode

④

Date.time and prompts of

special display mode

⑫

Automatic reading lock-up icon

⑤

Units of date and time

⑬

ATC—Auto temperature compensation

MTC—Manual temperature compensation

⑥

Units of measurement

⑭

Stability icon of readings

⑦

Units of temperature

⑮

USB communication icon

⑧

Units during calibration

⑯

Low power indication

Fig.-1

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3.2 Key Operation

Short press: key press time < 2 s; Long press: key press time> 2 s.

Power on: Press to turn on. Shutdown: long press 2 seconds off.

First time use: see parameter setting P4.7 & P4.8 to set correct date and time

(as Clause 8.3)

Special notes: Before get readings or do other operations, wait about 30 seconds after

meter powered on.

Table - 1 Key operation and functions

Key

Operation

Functions

Short Press

In the shutdown mode: press the key to boot

In measurement mode: press to turn backlight on or off

Long Press

Press and hold for 2 seconds to turn off

Short Press

In measurement mode: press the key to switch unit:

%→mg/L or %→ppm

Long Press

In the measurement mode:

press the key for 2 seconds to enter the calibration mode

Short Press

To cancel anyoperation, press to return to measurement mode

Short Press

In measurement mode: press to enter menu mode;

In calibration mode: press key to calibrate;

In the menu mode: press keyto confirm the parameter.

Short Press

Long Press

In measurementmode: press keyto change the serial number or

press to recall the measurement value.

In recall mode(RM), short press to change serial number of stored

measurement value, or long press to conduct rapidly change;

In the menu mode:press the key to change the serial number or

select the parameter

Fig.-2

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3.3 Batteries

The instrument uses threeAA batteries, please use the LR6-type

alkaline batteries to ensure battery quality. Battery life > 200 hours

(no backlight). When the display shows symbol as shown in

Figure-3, replace the battery.

3.4 Instrument Socket

The instrument socket protected by grey rubber sealing cap, as

shown in Figure-4.

Eight-pin socket (right) - connect DO electrode, When inserting

the probe plug, please insert it after the notch position, and tighten

the plug nut.The end face of the socket and the plug connection

has the sealing ring, which can effectively maintain the waterproof

protection of the socket.

BNC socket (left) - connect salinity electrode

RCAsocket (middle) - connect temperature probe

3.5 Display mode

3.5.1 Main Display Screen

If don`t connect the salinity probe or salinity lower than 1ppt, only

the DO value and temp value display on the LCD screen as shown

in Figure-5, DO value: 8.18mg/L,Temp value: 25.2℃.

When connect salinity probe and salinity higher than 1ppt, salinity will

be displays on right bottom of the LCD screen, as shown in Figure-6,

DO value: 6.97mg/L, Temp value: 25.2℃.Salinity: 32ppt, Press

key to switch beteen unit of mg/L→%. Or select unit of mg/L or ppm

in parameter setting P3.1.Time displays on top right of LCD screen.

3.5.2 Reading Stability Mode

When the measured value is stable, the LCD screen displays the icon

as shown in Figure-7. If there is no icon or icon flashing,

indicates that the measured value is not stable, the measured value

should not be read or calibrated.

3.5.3Auto Lock Mode

In parameter setting P4.3 you can select the auto-lock mode (Off-On) ,

Select On to turn on automatic locking. When the reading is stable

for more than 10 seconds, the meter automatically locks the measured

value and displays the HOLD icon, as shown in Figure - 8.When auto

locked, press to unlock. Select Off to turn off automatic locking.

Fig.-3

Fig.-7

Fig.-8

Fig.-5

Fig.-6

Fig.-4

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3.6 Data storage.recall and clear.

3.6.1 Manual storage

When the measurement is stable, press key, the meter will store

measureent value, M+ icon and storage serial number will be displayed

on right botton of LCD sreen, as shown in Figure-9, first group of data

was stored.If connect salinity probe, press key, M+ icon and

storage serial number will be displays for 2 seconds, then salinity

displays on LCD screen continously. As shown in Figure-6

3.6.2. Automatic timing storage

Set the storage timing (eg. 3 minutes) from parameter P4.1, icon

displays on LCD screen, the meter enters into the timing storage mode.

When press key, icon flashes and the first measuring value

is stored,after 3 minutes, the 2nd measuring value is stored automaticly.

See Figure-10 the meter stores eight measuring values automatically.

When press key, icon stops flashing and the meter stops

automatic storage. In automatic storage mode, manual storage does

not work.

Set time 0 from parameter P4.1 to exit from the automatic storage mode.

3.6.3. Recall stored value

In the measurement mode, press key to recall the last stored

measured value. See Figure 11: Pressing key or key to

recall successively the stored measuring value. Press and hold

key or key to recall the stored measuring value quickly.

3.6.4. Clear stored value

Select YES from parameter P4.4 to clear all stored value.

3.7 Backlighting

The Instruments LCD screen has a white backlight suitable for use in dimly lit environments.

Turning on the backlight will consume more power. There`s two backlighting mode. On and

Off, you can select in the parameter setting P4.5. Select On, press backlight will be on

for a minute then automatically shuts off. Select Off, when the key is pressed,

backlight will be on and will be off only is pressed again.

3.8 Automatic Power-Off

In the parameter setting P4.6, you can set the auto power off function (On-Off), select On to

turn on auto power off function, the instrument will shut down automatically after last key

press within 20 minutes, select Off to disable this function.

Fig.-11

Fig.-10

Fig.-9

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4 Optical Dissolved Oxygen Probe

4.1 Probe Structure

The instruments DO803 optical dissolved oxygen probe has a cable length of 3m and a

built-in temperature sensor for automatic temperature compensation. The electrode

structure is as shown in Figure.-12

1. Bottom cover of the calibration sleeve

5. Locking cap

2. Sponge for water storage

6. Optical DO electrode

3. Sensor cap

7. O ring

4. Calibration/Storage sleeve

Immersion line:

The tested solution should be above this line

4.2 Probe Maintenance

When store the probe, it should be kept in the calibration/storage sleeve, and keep the

sponge in moist, so that the fluorescent cap will not dries out. This is very important.

Otherwise it may cause unstable measurements or slow response.

(A) Before the first time use, unscrew the bottom cover of calibration sleeve to check if the

sponge is wet.if water storage sponge dry, or an exposure of more than 8 hours in the

dry air, should remove the electrode at room temperature and soak the probe in tap

water for 24 hours and hydration, if the water temperature is low, the soaking time

needs 48~72 hours.

(B) Daily-storage, Insert the probe in calibration/storage sleeve, twill on the locking cap

tightly, add several drops of clean water every three days to keep the probe head wet.

(let the sponge be saturated, but not dripping), for long-term storage, users can store

the electrode in a beaker containing water.

produce oxygen. If stained or moldy, please clean immediately. There`s four

water-storage spong for back-up in complete packing kit.

Fig.-12

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4.3 Sensor Cap

(A) The sensor cap is an important part of the optical DO probe. The surface coating of the

cap cannot be scratched or mechanically worn. Otherwise, the life of the sensor cap will

be reduced or the probe will be damaged. Please pay special attention to it when using

the probe.

(B) The surface coating of the sensor cap cannot withstand high temperatures, so the

optical DO probe can not be tested in water above 50 ℃.

solvents to clean, otherwise it may damage the probe. It can be gently wiped with a soft

cloth or paper towels. To disinfect theprobe, immerse it in 3% hydrogen peroxide for 15

to 30 minutes and then rinse off with water.

(D) The sensor cap has a service life of more than 8000 hours. When the probe is not being

used, it does not "bleach" luminescence layer; in addition, the storage time will not

reduce the life of the probe, so the actual use time of the sensor cap is far more than a

year. The major factor affecting the service life of the sensor cap is the surface coating

being damaged under external force. So the key is to protect the sensor cap from

external damage.

(E) If the sensor cap is damaged or deteriorated, users need to purchase a new one. Every

new cap has a set of calibration codes which need to be input into the instrument. The

specific input method will be described in the instruction manual of sensor cap.

(F) The probe that comes with the instrument or purchase separately (the luminescence

cap was assembled on the probe already) can be used directly without the input of the

calibration codes. So users should not take off the sensor cap when it is not in use. Nor

should one swap the caps from different probes. When being installed, the sensor cap

must be tightened and the interior can not be contaminated or wet.

5 Preparation for Calibration

5.1 Dissolved Oxygen Units Selection

Dissolved oxygen units displays in two forms: mg / L and %, and ppm and %. Press to

switch between mg / L →%, or ppm → %. Users can choose mg / L or ppm in parameter

setting P3.1, but only a percentage (DO%) is displayed in probe calibration.

5.2 Resolution Selection

The resolution unit can be selected in parameter setting P3.2: 0.01 or 0.1mg/L (ppm), After

setting, the meter will display resolution of 0.1 or 1 in according to %.

5.3 Temperature Unit Selection

The temperature unit can be selected in parameter setting P4.2: ℃or ℉.

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