GREISINGER LF 425 Conductivity Measuring Cell Instruction Manual
- June 17, 2024
- GREISINGER
Table of Contents
GREISINGER LF 425 Conductivity Measuring Cell
Intended use
Measurements of conductivity resistivity, salinity and TDS fitted with the devices GMH 5430/50, GHM Silverline SLC
Applications:
- Aquarists , Fish farming
- Drinking water
- petrol, diesel: LF 210 etc.
General advice
Read through this document attentively and make yourself familiar to the operation of the device before you use it. Keep this document in a ready-to- hand way in order to be able to look up in the case of doubt.
Safety instructions
This device has been designed and tested in accordance to the safety regulations for electronic devices. However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and special safety advises given in this manual will be adhered to when using it.
- Trouble-free operation and reliability of the device can only be guaranteed if it is not subjected to any other climatic conditions than those stated under “Specification”.
- Warning: Do not use this product as safety or emergency stop device or in any other application where failure of the product could result in personal injury or material damage. Failure to comply with these instructions could result in death or serious injury and material damage
Operating and maintenance
- Treat device and probes carefully. Use only in accordance with above specification. (do not throw, hit against etc.). Protect from soiling.
- The measuring cell must never come into contact with water-repellent materials such as oil or silicone.
- Cleaning
| Contamination | Cleaning Solution |
|---|---|
| water soluble | deionized water |
| grease , oil | warm water and household cleaning solution |
General information about conductivity measuring
Basically there are two types of measuring cells: 2-pole and 4-pole cells. The operation is done similarly; the 4-pole measuring cells can compensate polarization effects and – up to some degree – soiling due to its complex measuring method.
The selection of a suitable electrode depends on the desired application.
- The widest range of application is guaranteed by high-quality 4-pole graphite measuring cells (LF 400 or LF 425, all the above applications and: seawaters, titration and sewage).
- 2-pole platinum electrodes with glass shaft are good solution for used in petrol, diesel, etc. with low conductivities (< 1000 µS/cm) (LF 210)
Disposal notes
This device must not be disposed as “residual waste”.
To dispose this device, please send it directly to us (adequately stamped).
We will dispose it appropriately and environmentally friendly.
Assignments
Pin LF 210 LF 400 / 425
- measuring cell 1 supply 1
- measuring cell 1 signal 1
- measuring cell 2 signal 2
- measuring cell 2 supply 2
- temperature temperature
- temperature temperature
- Not connected Not connected
Specification
| Measuring Cell | LF 210 | FL 400 | LF425 |
|---|---|---|---|
| number of electrodes | 2 | 4 | 4 |
| Material | platinum | graphite | graphite |
| materials in contact to media | glass platinum | graphite epoxy | graphite |
epoxy
Cell constant| 1 ± 0,2 cm-1| 0,55 ± 0,04 cm-1| 0,4 ± 0,02 cm-1
Temperature measurement Sensor| NTC (10 kΩ / 25 °C)| NTC (10 kΩ / 25
°C)| Pt 1000
Meas. Ranges Conductivity| 0…1000 µS/cm| 0…200 mS/cm| 0…1000 mS/cm
Temperature| -5…+80 °C| -5…+80 °C| -5…+80 °C
Dimensions
Shaft diameter| 12 mm| 12 mm| 16 mm
Shaft length| 120 mm| 120 mm| 145 mm
Cable length| ca. 1 m| ca. 1 m| 1 m
Immersion depth| 100 mm| 100 mm| 100 mm
Guarantee| 12 month (assuming appropriate usage)
Accuracy
Conductivity: depending on display instrument| Better ±0,5% of m.v. ±0,2
% FS or ±2 μs/cm| Better ±0,5% of m.v ±0,1 % FS or ±2 μs/cm
Temperature| ±0.2 K 25 °C
Nominal temperature
Ambient temperature| -5 … +80 °C ((short time 100 °C)
Storage temperature| -5 … +80 °C
Connection| plug 7 pol bayonet fitting (IP65)
Customers Support
Hans-Sachs-Str. 26 • D-93128 Regenstauf
+49 (0) 9402 / 9383-0
+49 (0) 9402 / 9383-33
