Checker Plus®

EMS Catalog #70699-02

Introduction

The Checker Plus electronic pH tester supplies you with fast and accurate readings on a large LCD. The electrode can be replaced, allowing the tester to last for years. Checker Plus is great for environmental, field and laboratory testing. Also suitable for checking electrodes in pipes and tanks and various laboratory applications. The Checker Plus pH tester includes a replaceable electrode with a screw-type connector, 2 sachets of 4.01 buffer solution, 2 sachets of 7.01 buffer solution, 2 sachets of cleaning solution and a plastic carrying case.

Features

• Large and easy-to-read LCD
• High accuracy with 0.01 pH resolution
• Automatic, one or two points calibration
• Battery life: 1,000 hours of continuous use
• Wide range: 0.00 to 14.00 pH
• Replaceable pH electrode.

Specifications

Special Notes

• Ensure that all products used are agreeable with desired application and environment
• Always make sure the connector is clean and dry
• Never immerse the electrode over the maximum immersion level
• White crystals may appear around the cap. This is normal with pH electrodes and theydissolve when rinsed with water
• Do not use distilled or deionized water for storage purposes
• Do not store in hazardous environments
• Do not place unit in microwave as damage/burns may occur
• Unacceptable interferences to other electronic equipment may occur while using this item
• Any modifications to equipment may damage the meter's EMC performance

Preparing the Meter

The pH electrode is shipped dry. Steps to take BEFORE using the meter:

1. Remove protective cap on the electrode.
2. Condition electrode by soaking the just the tip – bottom 4 cm (1.5") of electrode – in pH 7.01 buffer solution for several hours.
3. Calibrate the electrode. (Calibration steps on back.)
4. Connect the electrode to the meter.
5. Turn the Meter on by pressing ON/OFF button.
6. Remove the protective cap and immerse the tip of the electrode in the sample to be tested.
7. Stir gently and wait for a stable reading.
8. After use, rinse the electrode with water and store it with a few drops of storage solution in the protective cap.
9. Replace protective cap after each use.

Basic Operation

Press the ON/OFF button to turn the meter on. All tags will be displayed. The meter will go into measurement mode: current reading and calibrated buffers are displayed.

Meter Calibration

In measurement mode, press and hold the ON/OFF button until "CAL" is displayed. When "7.01" blinks on the display, place the tip of the probe into a pH 4.01, 7.01, or 10.01 buffer solution.

Use "Procedure 1" for one or two-point calibration using pH 7.01 buffer.

Use "Procedure 2" for one-point calibration using pH 4.01 or pH 10.01.

Procedure 1

For one or two-point calibration using pH 7.01 buffer

When pH 7.01 buffer solution is used as the first point, the buffer is recognized with the blinking stability indicator. When the reading is stable, the stability indicator will disappear and pH 7.01 will be calibrated.

When pH 7.01 is the only calibration point, finish this one-point procedure:

• pH 4.01 will then blink on the display
• Press Button and "Sto" will display
• Meter will then exit to measurement mode and the calibration tag will be displayed

When using pH 4.01 or pH 10.01 as a second point, continue with the two-point procedure below:

• Use pH 4.01 or pH 10.01 to perform a two-point calibration
• The value is automatically recognized and displayed with the blinking stability indicator
• When the reading is stable, the stability indicator will disappear. "Sto" will be displayed when the calibration is saved
• Meter will exit to measurement mode and calibration tags will be displayed

Procedure 2

For one-point calibration using pH 4.01 or pH 10.01 buffer

When pH 4.01 or pH 10.01 buffer solution is used as the first point, the value of the buffer is recognized and displayed with the blinking stability indicator.

• When the reading is stable, the stability indicator will disappear."Sto" will be displayed when the calibration is saved
• Meter will exit to measurement mode and the calibration tag will be displayed

LCD Readouts/Troubleshooting

Care and Maintenance Tips

Battery Replacement: To change the CR2032 Li-ion battery, turn the battery cover located on the back of the meter counterclockwise to unlock. Remove cover and replace with + side facing up.
Note: Batteries should only be replaced in a safe area using the battery type specified in this instruction manual. Old batteries should be disposed in accordance with local regulations.

Follow these tips to aid in attaining the highest accuracy for measurements

• Rinse probe with purified water each time before placing in buffer or sample to be tested.
• Use fresh buffer for each calibration. Note: Calibration is only as good as the buffer being used. The pH buffer values change over time once the sachets are opened.
• ALWAYS add many drop of storage solution to the protective cap when storing unit. If storage solution is not available, pH 4.01or pH 7.01 buffer can be used.
• Calibrate and measure samples at the same temperature. A large change in temperature between buffer solutions and samples to be tested will give inaccurate readings
• Calibrate using a minimum of two points for better accuracy. It is important to use buffers that bracket the expected value of the sample to be tested. Example: if the expected value is pH 8, the meter should be calibrated using pH 7.01 and pH 10.01 buffers.

Replacement Probe

The EMS catalog number for the replaceable probe is 70700-01.

Product Information

Checker Plus®