Control Company DIGITAL OXYGEN METER User Manual

Probe head with Diaphragm set

Probe filling Electrolyte

SPECIFICATIONS

Ranges: Dissolved Oxygen 0 to 20.0 mg/L (liter)

Oxygen hi Air 0 to 100.0% 0 Temperature 0 to 50°C

Resolution: Dissolved Oxygen 0.1 mg/L Oxygen 0.1% 0 Temperature 0.1°C

Accuracy: Dissolved Oxygen ± 0.4 mg/L Oxygen ±0.7% 0 Temperature ±0.8°C, ±1.5°F

Probe Compensation Temp: 0 to 50 °C, automatic and Adjustment: Salt: 0 to 39% Salt

Height 0 to 3900 meters

Sampling Time: approximately 0.4 seconds Data Output: RS-232 PC serial Interface Case: ABS plastic Fail safe: Low battery Indicator Power: one (1) 9-Volt alkaline battery Accessories Supplied: carrying case, oxygen probe, spare

diaphragms (two), electrolyte for probe, battery, Traceable® Certiﬁ cate, instructions.

FIGURE 1

DESCRIPTION

4-1 LCD Display 4-2 Power on/ff Button 4-3 Data Hold Button: press to hold reading 4-4 °C/°F button 4-5 LCD contrast Adjustment Knob 4-6 Memory Record Button: press to record results. 4-7 Memory Recall Button: press to show minimum and

maximum readings. 4-8 Factor Adjustment Button 4-9 Zero Button 4-10 % Salt Button 4-11 DO/02 Button 4-12 02 Calibration Button

4.43 Mountain Height Button 4-14 Battery Compartment 4-15 Probe Input Socket 4-16 RS-232 Output Socket 4-17 Oxygen Probe 4-18 Temperature sensor 4-19 Probe head with diaphragm 4-20 Protection cover for probe head 4-21 Oxygen Probe Plug

DIGITAL OXYGEN METER OPERATION

This unit has been shipped with Electrolyte Liquid 1. in the sensor. This enables the probe to correctly report oxygen. If calibrating the meter is difﬁ cult or if the meter readings are unstable, then it is possible that there is insufﬁ cient or no electrolyte in the sensor. SEE REPLACING ELECTROLYTE on how to ﬁ ll the sensor. Before use, the unit must be calibrated. Disconnect 2. the OXYGEN PROBE PLUG (4-18, ﬁ g. 1) from the socket on top of the unit labeled INPUT (4-15, ﬁ g. 1). Turn the meter on by switching the POWER 3. BUTTON (4-2, ﬁ g. 1) to the right. Select 04.

by sliding the O2/DO selector (4-11, ﬁ g. 1)

to this position. Press the ZERO BUTTON (4-9, ﬁ g. 1). The display 5. will show 0. Connect the OXYGEN PROBE PLUG (4-18, 6. ﬁ g. 1) to the socket on top of the unit labeled INPUT (4-15, ﬁ g. 1). Wait at least ﬁ ve (5) minutes until the displayed values stabilize and no longer ﬂ uctuate. Press the 07. The display will show either 20.8 or 20.9, the typical

CALIBRATION BUTTON (4-12, ﬁ g. 1).

oxygen percentage in the air.

NOTE: Calibrate the meter In a large, well ventilated environment for best results.

To measure Dissolved oxygen, slide the O8. selector (4-11, ﬁ g. 1) to the DO position. Depending on your application, you may need to 9. adjust the % salt compensation of the probe. Press % SALT BUTTON (4-10, ﬁ g. 1). The Display will show an “S” for salinity, and 0%. Press the FACTOR ADJUSTMENT BUTTON (4-8, ﬁ g. 1) once. This will add 1% to the original salt %. Continue pressing this button until it reaches the desired value. When complete, press % SALT BUTTON (4-10, ﬁ g. 1). If your measurement is not taking place at sea level, 10. you will need to adjust the Height compensation. Press the MT BUTTON (4-13, ﬁ g. 1) The Display will show an “H” for height and a 0 for zero sea level. Press the FACTOR ADJUSTMENT BUTTON (4-8, ﬁ g. 1) once. This will add 100 meters. Continue pressing this button until it reaches the desired value. When complete, press MT BUTTON (4-13, ﬁ g. 1). Immerse the probe at least 10 cm into the liquid 11. being measured. This ensures that the probe will measure the temperature of the liquid and the automatic temperature adjustment will take place. Allow a few minutes for the probe temperature reach the temperature of the liquid. If there is more than a few degrees of difference between the temperature of the liquid and the probe, allow more time for the probe temperature to adapt. To measure the dissolved oxygen content, the 12. velocity of the liquid being measured must be at least 0.2-0.3 m/s. To achieve this, immerse the probe in the solution and gently shake it. For a more accurate measurement, use a magnetic agitator to

/DO

ensure a certain velocity. Indicate that the value is a “held” value. To cancel the data hold feature, simply press the HOLD BUTTON a second time. After use, rinse the probe thoroughly with tap water.13.

DATA HOLD

To hold a measurement on the display, press the HOLD BUTTON (4-3, ﬁ g. 1) while a measurement is being taken. The LCD display will show DH in the upper left portion of the display to indicate that the value is a “held” value. To cancel the data hold feature, simply press the HOLD BUTTON a second time.

DATA RECORD

To record a measurement, press the RECORD 1. BUTTON (4-6, ﬁ g. 1) while a measurement is being taken to hold the displayed value. The LCD display will show REC in the lower left portion of the display to indicate that the value is being recorded. To deactivate the record function, press the RECORD BUTTON again. Memory Recall: Use the RECALL BUTTON 2. (4-7, ﬁ g. 1) to recall the minimum, maximum and average readings. When the REC symbol appears on the display, press the RECALL BUTTON (3-6, ﬁ g. 1) once. The maximum recorded value will be displayed. The letters “Max” will also appear on indicating that this is the maximum or highest reading. A second press of the RECALL BUTTON will display the minimum reading. The letters “Min” will also appear indicating that this is the minimum or lowest reading. A third press of the RECALL BUTTON will display the average reading. The letters “Avg” will also appear indicating that this is the average reading. Note: The Data Record function must be in use to utilize the Memory recall features. Once the RECORD BUTTON has been pressed a second time to deactivate the data record function, the minimum, maximum and values are no longer stored.

AUTOMATIC SHUT-OFF

The unit has an automatic shut off feature to prolong battery life. If no button on the unit is pressed for ten minutes, the unit will automatically shut off. To deactivate this feature, press the RECORD BUTTON while a measurement is being taken.

DISPLAY CONTRAST ADJUSTMENT

The Contrast of the LCD display may need to be changed either because of light conditions, battery voltage drop, or user preferences. The LCD display contrast can be adjusted using the LCD DISPLAY CONTRAST ADJUSTMENT KNOB (4-5, ﬁ g. 1). Simply turn the knob to the left or right until the optimal LCD contrast is obtained. If the display is ﬁ lled with “88888” when no reading is being taken, the contrast needs to be adjusted. Turn the contrast knob to the left until a single “0” appears.

RESETTING THE CPU SYSTEM

Certain incorrect operational procedures may disrupt the meters CPU system. If the meter is not working properly, the circuit may need to be reset. Set the DO/02 switch to 02 (4-11, ﬁ g. 1). Turn off the meter by pressing the power button (4-2, ﬁ g. 1). Disconnect the probe from the meter. Press the 02 CALIBRATION BUTTON (4-12, ﬁ g. 1) continuously. While still pressing this button, press the power button again. Then press the zero button (4-9, ﬁ g. 1). Reconnect the probe and wait until the reading stabilizes. Press the 02 CALIBRATION BUTTON (4-12, ﬁ g. 1) again. Turn the power off. Begin normal operating procedures again.

FIGURE 2

REPLACING THE ELECTROLYTE

When the meter cannot be calibrated 1. properly or if the reading is unstable, the electrolyte may need to be reﬁ lled or the diaphragm may be dirty and need to be replaced. Unscrew the Probe Head (8-3, ﬁ g. 2) Pour out the old electrolyte from the Probe Head 2. (8-3, ﬁ g. 2). Pour in the new Electrolyte into the container of the 3. probe head. Reassemble the Probe Head (8-3, ﬁ g. 2) with the Probe 4. Body (8-1, ﬁ g. 2).

RS—232 PC SERIAL INTERFACE

This unit features RS—232 output. A RS—232 OUTPUT SOCKET (4-10, ﬁ g. 1) is located on the top of the unit. To utilize this feature, connect the unit to a PC with the Data Acquisition Accessory. (SEE ACCESSORIES SECTION).

Data is displayed in a 16 digit stream: D15 through D0. Each digit indicates the following: D0 end word D1 to D4 Upper Display Reading, D1=LSD, D4=MSD D5 to D8 Lower Display Reading, D5=LSD, D8=MSD D9 Decimal Point (DP) for Upper Display:

0= no DP, 1=1 DP, 2= 2 DP , 3= 3 DP

D10 Decimal Point (DP) for Lower Display:

0= no DP, 1= 1 DP, 2=2 DP ,3= 3DP

D11/D12 Annunciator for Upper Display:

00= No Symbol, 01= °C, 02= °F, 03= %, 04= %RH, 05= % PH, 06= %O2 07= mg/L, 08= m/s, 09= knots, 10= Km/h, 11= Ft/mm, 12= mph, 13= ųS, 14=mS 15= Lux, 16= Ft-cd, 17=dB, 18=mV

D13 Annunciator for lower display:

0= No symbol, 1= °C, 2= °F D14 Reading Polarity for the display: 0= both upper and lower displays are “+”, 1= upper is “–” and lower is “+” 2= upper is “+” and lower is “–”, 3= both upper and lower displays are “–”. D15 start word

BATTERY LIFE

If the letters “LBT” appear on the left corner of the display, it indicates the battery is low and needs to be replaced. To replace the battery, slide the battery cover located on the back of the unit away from the unit. Remove the old battery and replace it with a new 9-Volt alkaline battery. Use an alkaline battery, NOT a regular or heavy duty battery. Properly connect the battery. Replace the battery cover. Incorrectly installed batteries may damage electronics.

ALL OPERATIONAL DIFFICULTIES

If this oxygen meter does not function properly for any reason, please replace the battery with a new 9-Volt alkaline batteries (see Low Battery section). Low battery power can occasionally cause any number of “apparent” operational difﬁ culties. Replacing the batteries with new fresh batteries will solve most difﬁ culties.

ACCESSORIES Cat. No. 4138 Easy-Use™ Accessory Adaptor 115 VAC

Bonus Free Disk This demonstration disk shows the

data acquisition capabilities of this digital product when connected to a computer. See Cat No. 4136 below to order complete Data Acquisition System.

Cat No, 4136 Data Acquisition System Accessory Complete

DAS—3™ Data Acquisition System captures, displays, and stores readings on any IBM-compatible PC. Information can be imported into databases. Includes 3½ inch diskette and 5’ serial cable with D9F plug.

Cat No. 4325 Data Logger Complete DAS-4™ System captures and

stores up to 8000 bytes (over 1000 readings) from all meters. Reading may be taken at intervals from 1 second to 99 hours. Stored readings may be downloaded to any PC and viewed. Can be read “as is” or imported to spreadsheets, databases, and statistical programs. Supplied with 36-inch serial cable with D9F computer plug, 3½ inch diskette (Windows®), and four AA alkaline batteries. Size is 5 x 3 x 1 inches. Weight is 7 ounces.

Cat. No. 4326 Accessory Adaptor 115 VAC for Data Logger

WARRANTY, SERVICE, OR RECALIBRATION

For warranty, service, or recalibration, contact:

CONTROL COMPANY

4455 Rex Road

Friendswood, Texas 77546 USA

Ph. 281 482-1714

Fax 281 482-9448

E-mail sales@control3.com

www.control3.com

Control Company is ISO 9001

Quality-Certified by DNV and ISO 17025 accredited as a

Calibration Laboratory by A2LA.

TRACEABLE

DIGITAL

OXYGEN METER

INSTRUCTIONS

Traceable® is a registered trademark of Control Company.