No.6425-20
Probe for Flat Surface
640S-4
JAN code : 4974425600021
Calibration : Available
JCSS Accredited Calibration : Not available
640S-4 is a make-to-order sensor probe for SK-620PH, SK-620PHII, SK-625PH Handy Type pH Meter and SK-650PH Desktop Type pH Meter, suitable for flat surfaces such as leaves, skins, and cut surfaces of fruits.
Internal solution is refillable.
Feature
■ Internal solution is refillable with Cat. No. 6426-00 Spare Internal Solution (three 35-mL bottles).
Description
■ Notice
- The sensor may be damaged to shorten its life if it is used for liquids such as organic solvents, oils, adhesives, surface-active agents, strong acids (pH 0 to 2), or strong alkalis (pH 12 to 14).
- The reading may become unstable if you measure pure or tap water.
- If you measure food or drink, take a sufficient quantity of a sample in a separate container so that the end of the sensor is immersed at least 3 cm in the sample. Do not eat or drink the sample after measurement.
- The sensor is made of glass, so take a great care in handling. Be careful not to injure yourself when it is broken.
■ 640S-4, 640S-5, and 640S-6 do not contain a thermal sensor for temperature compensation.
Specifications
| Cat. No. | 6425-20 |
| Product name | Probe for Flat Surface |
| Model name | 640S-4 |
| Measuring range | pH 2.00 to 13.00 |
| Accuracy |
±0.03 * No temperature compensation |
| Detector | Glass electrode with refillable KCl solution of 3.3 mol/L |
| Operation ambient | 15 to 50°C |
| Liquid junction | Sleeve type |
| Materials |
Electrode protection tube: Lead-free glass Cable: PVC |
| Dimensions |
Probe: 12 mm diameter x 156 mm (L) Cable: 1 m (L) |
| Weight | 69 g |
| Standard accessories | Electrode cap x1, spare internal solution 35 mL x1 |
