EUTECH INSTRUMENTS DO 700 User manual

Instruction Manual

DO 700 Dissolved Oxygen/ºC/ºF

Bench Meter

Technolo

ade

Part of Thermo Fisher Scientific 68X541703 Rev. 2. Sep 2010

TABLE OF CONTENTS

1. INTRODUCTION.............................................................. 1

2. GETTING STARTED........................................................ 2

2.1 Keypad Functions ...................................................................2

2.2 LCD Annunciators...................................................................3

2.3 Meter Connections..................................................................3

3. DISSOLVED OXYGEN / ATC ELECTRODE................... 4

4. CALIBRATION................................................................. 5

4.1 Temperature Calibration .........................................................6

4.2 % Saturation Calibration .........................................................7

4.3 100% Calibration.....................................................................7

4.4 0% Calibration.........................................................................7

4.5 mg/L or ppm (Concentration) Calibration................................8

5. SETUP FUNCTIONS........................................................ 9

5.1 1.0 CAL (Calibration)...............................................................9

5.2 2.0 ELE (Electrode Information)..............................................10

5.3 3.0 ConF (Configuration).........................................................10

5.4 3.1 rdY (Ready Stability Indicator / Auto Hold)........................10

5.5 3.2 ºC ºF (Celsius or Fahrenheit) ............................................10

5.6 3.3 dPr (Barometric Pressure Adjustment)..............................11

5.7 3.4 SALt (Salinity Adjustment) ................................................11

5.8 3.5 OFS (Offset Adjustment) from % mode.............................11

5.9 3.5 Unit (Unit Adjustment) from concentration mode...............12

5.10 4.0 rSt (Reset).........................................................................12

5.11 5.0 CLr (Clear Stored Memory)...............................................12

6. TAKING MEASUREMENTS ............................................ 13

6.1 HOLD Function .......................................................................14

6.2 Storing and Recalling Data .....................................................14

7. ELECTRODE MAINTENANCE........................................ 15

8. DISSOLVED OXYGEN THEORY .................................... 18

9. REPLACEMENTS AND ACCESSORIES........................ 22

10. TROUBLESHOOTING GUIDE......................................... 23

11. SPECIFICATIONS............................................................ 25

12. WARRANTY..................................................................... 26

13. RETURN OF ITEMS......................................................... 27

1. INTRODUCTION

Thank you for purchasing our DO 700 series benchtop meter.

This microprocessor-based meter is economical and simple to

use. The design incorporates a large LCD for clear viewing, yet

offers a small footprint to conserve space.

The DO 700 measures Dissolved Oxygen in % saturation or

concentration (mg/L or ppm) with temperature (ºC or ºF).

Each meter includes a convenient slide-out card for quick

reference. Also included is an electrode arm and metal bracket

which can be easily attached to the left or right side of the meter

according to your preference.

We take great pride in every instrument we manufacture

and hope this one serves you well.

2. GETTING STARTED

2.1 Keypad Functions

Powers the meter on and off. Upon power on, the meter

automatically begins in the mode that was last used.

Calibration and memory values are retained even if meter

is unplugged.

Toggle between available measurement modes—%

saturation or concentration (mg/L or ppm). Also used to

switch to Temperature calibration during DO calibration

modes.

Press and hold for 5 seconds to enter SETUP mode.

Toggles between measurement and calibration modes.

In SETUP mode, returns user to the measurement mode.

Confirms calibration values in CAL mode.

Confirms selections in SETUP mode.

View recalled values in memory mode.

SIncrease value. Scroll up in SETUP & CAL modes.

MI (Memory Insert) stores values into memory.

MR (Memory Recall) recalls values from memory.

TDecrease value. Scroll down in SETUP & CAL modes.

Freezes measured reading. Press again to resume

live reading.

2.2 LCD Annunciators

2.3 Meter Connections

DC Power supply

ATC Temperature connection of Dissolved Oxygen electrode

DO BNC connection of Dissolved Oxygen electrode

3. DISSOLVED OXYGEN / ATC ELECTRODE

The DO 700 includes a galvanic DO

electrode with built in temperature

measurement.

The electrode has a dual cable; a BNC

connector for DO measurement and a mini-

phono plug for temperature. The electrode is

pre-filled with electrolyte that is separated

from the sample by an oxygen permeable

membrane. The membrane is pre-assembled

for you and fixed to a detachable cap. The

pre-assembled cap design allows simple

replacement and fast conditioning.

The electrode is light-weight with a 12-mm

body diameter and a 16-mm tip diameter

from at the detachable Noryl cap. The

compact sensing area reduces air

entrapment resulting in quick, accurate, and

stable readings.

Provide simple stirring for best results—

ideally achieve a minimum water flow rate of

2 inch/second on the membrane.

The probe is not recommended for samples

beyond 0 to 50 °C.

The membrane is thin and can be replaced if damaged. Use care to

protect from scratches, abrasion, or contact with solids. For best

results keep membrane clean by rinsing after daily use. See Section 7

– Electrode Maintenance.

4. CALIBRATION

The DO 700 has three measurement modes; DO as % saturation, DO

as mg/L (or ppm) concentration, and temperature.

Dissolved oxygen levels vary with temperature, barometric pressure,

and salinity, so calibration must be performed with consideration of

these factors. It is necessary to set the proper temperature,

barometric pressure and salinity values prior to performing any

DO calibration or measurement.

See Section 4.1 — Temperature Calibration.

See Section 5.6 — Barometric Pressure Adjustment.

See Section 5.7 — Salinity Adjustment.

The DO 700 will accept two % saturation calibration points; 100%

using saturated air or air-saturated water, and 0% using zero oxygen

solution. When 100% or 0% calibration is performed, the concentration

value is adjusted accordingly. Therefore, it is not necessary to calibrate

the concentration mode. If calibrating for 0% oxygen, note that the

meter will take several minutes to reach 0% saturation value and

constant stirring is not required.

The following table lists calibration values in % saturation calibration

mode with two different barometric pressures. Note that the saturation

value (92.1%) has decreased due to the lower barometric pressure

entered.

% Saturation

(of factory default value) Calibration Value

(760mmHg) Calibration Value

(700mmHg)

less than 10% 0% 0%

10.1% to 49.9% CAL ERR CAL ERR

50% to 150% 100% 92.1%

If calibration is attempted from 10.1% to 49.9%, CAL Err message is

shown—calibration is rejected and the display will return to calibration

mode.

The DO 700 will accept one calibration point in concentration mode.

The minimum value is 2 mg/L (ppm), and the calibration window is +/-

40% of the factory default value.

Temperature and % saturation calibration should take place before

attempting to perform mg/L (ppm) concentration calibration.

Calibration of the concentration mode will only replace the previous

concentration calibration and does not affect the % saturation

calibration.

To offset your % saturation reading to match another instrument, see

Section 5.8 – Offset Adjustment.

Perform daily calibration for best results. New calibration values will

automatically override the existing data. To completely recalibrate the

meter and when installing a replacement electrode, it is best to clear all

calibration data. See Section 5.10 – Reset.

4.1 Temperature Calibration

For best DO accuracy, ensure that the temperature is accurate. The

thermistor sensor used for automatic temperature compensation and

measurement is accurate and stable, so frequent calibration isn’t

required. Temperature calibration is recommended upon probe

replacement, whenever the temperature reading is suspect, or if

matching against a certified thermometer is desired.

The DO 700 will default to 25 ºC / 77 ºF when the ATC plug is not

connected.

1) Place the probe into a solution with a known accurate temperature

such as a constant temperature bath.

2) Press followed by . The primary display shows the

measured temperature while the secondary display shows the

factory default temperature.

4) Adjust the temperature using or . Press to accept or

to cancel. The meter allows an adjustable maximum value of ±

5ºC (or ± 9ºF) from the factory default temperature.

Table of contents

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