JENCO 6230M User manual

OPERATION MANUAL

JENCO

MODEL 6230M/6230N/6231M/6231N

MICROCOMPUTER BASED

pH/mV/TEMP

PORTABLE METER

JENCOELECTRONICS, LTD.

MANUFACTURER OF PRECISION INSTRUMENTS

Model 6230M 6230N 6231M 6231N

Storage Yes No Yes No

RS-232C Yes Yes No No

NOTES: 1. RS-232C interface operation is for 6230M and 6230N only.

2.The saving, recalling and erasing data functions are for 6230M and

6231M only.

3. RECALL mode and ERASE mode are for 6230M and 6231M only..

INITIAL INSPECTION

Carefully unpack the instrument and accessories. Inspect for damages made in

shipment. If any damage is found, NOTIFY YOUR JENCO REPRESENTATIVE

IMMEDIATELY. All packing materials should be saved until satisfactory operation

is confirmed.

GENERAL INTRODUCTION

The model 6230M, 6230N, 6231M or 6231N is a precise instrument for the

measurement of pH, mV, and temperature. A built-in microcomputer is used to

store, calculate, and compensate for all the relevant parameters relating to pH

determinations. These include temperature characteristics of the pH electrode, buffer

solutions and electrode slope deviations.

This instrument is made with a watertight case, which makes it splash resistant. The

mechanical touch keys are highly reliable with tactile and audio feedback. This meter

can be operated either with 6 AAA batteries or with an AC adaptor. Re-calibration is

not required when power is restored again. The instrument also displays a "LOBAT"

message when the batteries are in need of replacement.

The meter has a large LCD that displays the pH (mV) and temperature values

simultaneously along with the user prompting features and mode indicators. The

instrument prompts the user through the calibration and measurement procedures.

An AUTOLOCK feature is provided for both pH and mV measurements. This

enables the instrument to automatically sense the end point and “lock” the display to

indicate the end point value of a measurement. The meter can also be used in

non-AUTOLOCK mode.

The AUTOLOCK and the user prompting features help eliminate virtually all human

factors in the determination of pH and mV values, thus resulting in precise, repeatable

and error free measurements.

The meter can use pH electrode, ORP electrode and ATC (Automatic Temperature

Compensation) probe. One-point, 2-point or 3-point pH calibration can be used for

this meter and user should select one from them.

The meter is also equipped with a non-volatile memory allowing the user to store 40

different sets of readings. This unit will assign a site number for each set of readings,

so the user can review the data easily. (See Note 2)

Optional RS-232C can track all displayed values and interface the meter with

recorders, printers, computers, etc. (See Note 1)

Other features include, low power consumption, percentage of power supply display,

electrode offset recognition, electrode slope recognition, built-in buffer coefficients,

automatic or manual temperature compensation, auto-saving pH calibration values,

and high 50/60 Hz AC noise rejection. This meter is USER FRIENDLY, for field,

industrial and laboratory applications.

SPLASH PROOF

The meter is splash resistant with a watertight case. The instrument should not be

operated under water since the pH electrode is not waterproof. The splash proof

feature is to prevent permanent damage to the instrument when accidentally splashed

with non-corrosive solutions. Take the following measures immediately in the event

that the instrument is dampened in any kind of solution:

1. Rinse the instrument thoroughly with distilled water. The connectors should be

sprayed with a jet stream of water to remove all contamination that might create

electrical leakage potential paths. This leakage path may reduce the impedance of

the instrument and create polarization current between the pH and reference cells

of the electrode.

2. Rinse the electrode and spray its connector in the same manner.

3. Wait for the instrument and probe to dry completely before resuming operation.

4. Replace the pH electrode if satisfactory operation is not resumed.

1. pH / ORP BNC CONNECTOR

2. REF. ELECTRODE INPUT CONNECTOR

3. ATC INPUT CONNECTOR

4. AC ADAPTOR INPUT CONNECTOR

5. ELECTRODE HOLDER

6. RS-232C CONNECTOR FIGURE 1 TOP VIEW

CHANGING THE BATTERIES

When the LOBAT indicator is flashing, the user should check that whether the

external AC adaptor is connected to the meter reliably, and if only internal batteries is

used, the user should change the batteries. If the voltage of power supply is too low,

the meter will display “Sht” and then shut down automatically.

1. Position the meter so that the left side of the meter is facing up. (Refer to Figure

2) With a coin, inset it in the closure slot on the side labeled A. With the coin

tilted, thrust it upward to open the battery compartment and lift the cover up.

2. Insert the batteries and ensure polarities are correct.

A. SIDE CLOSURE SLOT

B. COVER

C. 6 AAA BATTERIES

FIGURE 2 REAR VIEW (BATTERY COMPARTMENT)

TURN ON/OFF INSTRUMENT

Once the batteries are installed correctly and/or an AC adaptor is connected reliably,

you can press ON/OFF key to turn on or turn off the unit. After the unit is turned on,

it will display all segments of LCD for a few seconds then the buffer set will be

shown. After a while the percentage of power supply will be measured and displayed,

then the unit will go to the last mode that has been saved.

When the unit is not in use, press the ON/OFF key to turn off the unit for saving

battery life. Unplugging the AC adaptor from the unit or from the AC line does

not turn off the unit. It would automatically switch to the internal batteries.

When turning off, the last display mode will be auto-saved, except during RECALL

and ERASE modes where it will default to pH-AUTOLOCK mode. Calibration data

and the 40 different site readings are saved in non-volatile memory, and will be intact

even if the user turns off the unit.

THE KEYPAD (See Notes 2 and 3)

1. ON/OFF key:

The ON/OFF key turns the unit ON or OFF. The pH calibration values will not

be erased when the unit is turned off.

2. MODE key:

2.1. During normal operation, the MODE key will change the display mode

sequentially to pH-AUTOLOCK,mV-AUTOLOCK,pH, mV, RECALL

and ERASE. The calibration values will not be affected by changing the

display modes.

2.2. In pH calibration mode, the MODE key will exit the current calibration and

go to the measurement.

3. STAND and SLOPE keys:

3.1 The STAND and SLOPE keys are used for pH calibration of the instrument.

3.2 Press and hold the STAND key while turning on the power to change the

buffer set.

4. △(UP) and ▽(DOWN) keys:

4.1 The △and ▽keys are used to manually enter the temperature value in

manual (MAN) mode. These keys are inoperative when operating in ATC

mode.

4.2 In RECALL mode, the △and ▽keys will adjust the site number .

5. MEASURE key:

5.1 The MEASURE key is used to bring the instrument out of the

AUTOLOCK condition when operating in the pH-AUTOLOCK or

mV-AUTOLOCK mode.

5.2 During pH-AUTOLOCK,mV-AUTOLOCK,pH,or mV mode, pressing

and holding the MEASURE key for about 2 seconds will save all the

readings in the next available site number.

5.3 During RECALL mode, pressing the MEASURE key will display the

saved pH value and temperature value on the current site. Then pressing it

again will display the mV value and temperature value on the same site.

Press the MEASURE key one more time will go to the pH value and

temperature value.

6. CLEAR key:

During pH-AUTOLOCK and pH mode, the CLEAR key is used to clear all pH

calibration values stored in the internal memory and set them to default (ideal)

values. Under normal conditions, it will not be activated unless press and hold

this key for about 2 seconds. By doing this, the unit is ready for measurements

with STAND and SLOPE off and need not to be calibrated.

7. MEASURE and ▽keys:

Pressing and holding this combination during ERASE mode for about 5 seconds

will erase ALL data saved in the non-volatile memory. All 40 sites will be

erased completely. Do not use this function until all recorded data has been

reviewed or transcribed or downloaded.

THE LCD AND KEYPAD DESCRIPTION

1. STAND & SLOPE: Calibration indicators.

2. Main display: for pH and mV values.

3. Secondary display: for temperature value and site number.

4. AUTOLOCK : AUTOLOCK mode indicator.

WAIT: Displays while the unit waits for a stable reading or end port sensing.

5. All eight control keypads.

6. ATC & MAN: “ATC” displays if an ATC probe is connected. Otherwise “MAN”

displays.

7. LOBAT: Low battery indicator.

8. pH / mV: Unit and mode indicators.

FIGURE 3 FRONT VIEW

MODES OF THE METER (See Notes 2 and 3)

1. pH-AUTOLOCK mode:

The meter will display pH and temperature

with both pH and AUTOLOCK on.

WAIT flashes until the unit detects a stable

reading.

2. mV-AUTOLOCK mode:

The meter will display mV and temperature

with both mV and AUTOLOCK on.

WAIT flashes until the unit detects a stable

reading .

3.pH mode:

The meter will display pH and temperature

with pH on but AUTOLOCK off.

4.mV mode:

The meter will display mV and temperature

with mV on but AUTOLOCK off.

5.RECALL mode:

User can recall data saved in memory.

“℃”annunciator will flash.

←Site number

6.ERASE mode:

User can erase ALL data saved in memory.

OPERATIONAL PROCEDURES

Before operation, you should turn on the unit.

BUFFER TABLE SELECTION

This unit has two buffer sets: 4.01,7.00, 10.01pH and 4.00,6.86, 9.18pH. To change

the buffer set, turn off the unit, then press and hold the STAND key while turning on

the unit again. The user can select 1-point, 2-point or 3-point pH calibration. The first

point must be 7.00/6.86 buffer. The second and the third will be either 4.01 or 10.01

when the first point is 7.00. If the first is 6.86 then the second and the third will be

either 4.00 or 9.18.

pH CALIBRATION

1. Calibration in the pH-AUTOLOCK mode.

1.1 Connect the pH electrode to the BNC connector and ATC/Temp probe to the

ATC/Temp connector of the unit. The ATC will be on. Press the MODE

key repeatedly until the unit displays pH-AUTOLOCK mode.

1.2 Rinse the pH electrode and ATC/Temp probe in distilled water and immerse

in the first buffer solution. The unit will display the buffer temperature.

NOTE: If no ATC/Temp probe is connected, the MAN will be on, adjust the

temperature reading (0.0 to 60.0 ℃) to that of the first buffer using the △

and ▽keys.

1.3 Press the STAND key to calibrate. The pH annunciator flashes until the unit

exit pH calibration. The STAND annunciator will be on, and the WAIT

annunciator flashes until the unit detects a stable reading. When a stable

reading is reached, the WAIT annunciator will stop flashing and stay off.

The SLOPE annunciator will start to flash. This means that the first point

has been calibrated.

You can press the MODE key to exit for one point pH calibration. The pH

annunciator will stop flashing and be on, and the meter is ready for

measurements with STAND on but SLOPE off. If dual or three points

calibration is needed, go to 1.4.

1.4 Remove the pH electrode and ATC/Temp probe from the buffer and rinse

them in distilled water. After rinsing, immerse them in the second buffer

solution.

NOTE: If no ATC/Temp probe is connected, the MAN will be on, adjust the

temperature reading (0.0 to 60.0 ℃) to that of the second buffer using the

△and ▽keys.

1.5 Press the SLOPE key to calibrate. The SLOPE annunciator will stop

flashing and stay on. And the WAIT annunciator flashes until the unit

detects a stable reading. When a stable reading is reached, the WAIT

annunciator will stop flashing and stay off. This means that the second point

has been calibrated.

You can press the MODE key to exit for dual points pH calibration. The pH

annunciator will stop flashing and be on, and the meter is ready for

measurements with both STAND and SLOPE on . If three points calibration

is needed, go to 1.6.

1.6 Remove the pH electrode and ATC/Temp probe from the buffer and rinse

them in distilled water. After rinsing, immerse them in the third buffer

solution.

NOTE: If no ATC/Temp probe is connected, the MAN will be on, adjust the

temperature reading (0.0 to 60.0 ℃) to that of the third buffer using the △

and ▽keys.

1.7 Press the SLOPE key to calibrate. The WAIT annunciator flashes until the

unit detects a stable reading. When a stable reading is reached, the WAIT

annunciator will stop flashing and stay off. This means that the third point

has been calibrated.

You can press the MODE key to exit for three points pH calibration. The

pH annunciator will stop flashing and be on, and the meter is ready for

measurements with both STAND and SLOPE on.

2. Calibration in the pH mode.

2.1 Connect the pH electrode and ATC/Temp probe to the top of the instrument.

The ATC annunciator will be on. Press the MODE key repeatedly until the

unit displays pH mode.

2.2 Rinse the pH electrode and ATC/Temp probe in distilled water and immerse

them in the first buffer solution. The instrument will display the buffer

temperature.

NOTE: If no ATC/Temp probe is connected, the MAN will be on, adjust the

temperature reading (0.0 to 60.0 ℃) to that of the first buffer using the △

and ▽keys.

2.3 Allow sufficient time for the electrode and ATC/Temp probe to stabilize.

Press the STAND key to calibrate. The pH annunciator flashes until the unit

exit pH calibration. The STAND annunciator will be on and the SLOPE

annunciator will flash, indicating that the first point has been calibrated.

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