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OEM - CONVERTER – CNDX, Conductivity interface board calibration, information and more...
Conductivity interface board accommodating conductivity cell K=1 with 10K@25C thermistor interface board, with built-in temperature compensation and power regulator. Wiring, calibrating, information and more.
The OEM custom board is provided with wires (option) for remote applications. Simply connect it to your PLC or Controller and control the conductivity of your aqua solutions.
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OEM
- Conductivity interface board drawing
Drawing information
1.
9V power regulator (please be advised Hot!) 2.
Power indicator 3.
Zero Calibration 4.
Calibration 5.
& 6. Output voltage-devider, factory setting (10:1) 7.
Cell and thermistor connector (MINI-DIN-6) 8. Stainless Steel (SS) tube encapsulating 10K-Ohms thermistor
Note: All on board trimmers (P3, P4 and P5) are multi-turn trimmers facilitates precise calibration. P5 is factory calibrate and should not recalibrate by the user.
Board mounting
Mounted easily via four or five 0.125" mounting holes. The board design to fit in EID-1599 series enclosure. Use 4-40 screws 0/25 long to mount it to the enclosure
Note: Wires, enclosure and five mounting screws are sold separately.
Board with conductivity cell and TC via Terminal Block (TB) mounting
Mounted easily via four or five 0.125" mounting holes. The board design to fit in EID-1599 series enclosure. Use 4-40 screws 0/25 long to mount it to the enclosure. Mount the enclosure via DIN-Rail mounting clip. (See application note 48 for more details.
Note: Wires, enclosure and five mounting screws are sold separately.
* For EID-1599 enclosure series click hear
Board with conductivity cell without TC via Terminal Block (TB) mounting
Note: 1%, 0.25W resistor connected across the TC input to insure 10K Ohms resistance at 25C. this option some times required when the sample is in water bath with constant temperature.
Mounted easily via four or five 0.125" mounting holes. The board design to fit in EID-1599 series enclosure. Use 4-40 screws 0/25 long to mount it to the enclosure. Mount the enclosure via DIN-Rail mounting clip. (See application note 48 for more details.
Note: Wires, enclosure and five mounting screws are sold separately.
* For EID-1599 enclosure series click hear
Board power supply information
Power via 11-24VDC or 11-16VAC or 12V car battery.
Note: Power down transformer sold separately.
* For our 110V or 220V to 12VAC Power down transformer (Class 2 Type Transformers EID-BP series) click Here
Conductivity cell information
The board is designed to measure aqua solutions via conductivity cell with K=1 constant and 10K thermistor.
* For our big selection of conductivity cells click hear
Note: Conductivity cells should be calibrated using a standard solution before using. When selecting a standard, choose one that has the approximate conductivity of the solution to be measured. After using the probe for some time, you might consider cleaning the plates with a mild liquid soap or acetone - Note: Do not use abrasive materials in cleaning.
Calibrations
1. Connect conductivity cell K=1 with Thermal Compensation TC (thermistor of 10K ohms @ 25 degrees centigrade) to the board (see below drawings).
Note: Any non–used wire, as well as shielded wire, can be connected to the Non-Connected (NC) pins of the MINI-DIN-6 connector.
Please be advised that wire connections to the board can be done either via the MINI-DIN-6 connector (PS/2 like connector), or wires can be soldered directly to the board (corresponding connector pins).
2.
Connect and power the board via 11-24VDC or 11-16VAC or 12V car battery.
3. Short switch wires. Ideally it’s done via command from the PLC through dedicated relay. Switch will be sufficient, however, all that we recommend is that you power the board for about 30 – 90 seconds. At the same time, take a reading and turn the board off. This will extend the conductivity cell life (reduce build-up).
4. While the cell is dry (not with contact with any liquid) in room temperature (25C), set P3 trimmer (10K ohms trimmer) so the output voltage is 0.000V. This function is also known as zero calibration.
5.
Insert the cell into buffer of 1413uS (NIST traceable) at 25C, and set the
output voltage via P4 (10K ohms trimmer) so that the output voltage is
141.3mV. This function is also known as calibration.
6.
Clean and dry the cell.
7.
Insert the cell into unknown aqua-solution and get corresponding voltage
readings.
Note: V-Out is scaled down in a ratio of 10:1 via R31 and P5 i.e. 1.413V to 141.3mV if you don’t need this function, shorten P5 (100K trimmer) pins.
Features
Specifications
Applications:
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