Table of Contents
Advertisement
Quick Links
Description..................................................................................................................................2
Specifications ..............................................................................................................................3
Electrical connections..................................................................................................................4
3.1
Analog front-end module.....................................................................................................4
3.2
AD Converter module ..........................................................................................................4
3.3
USB Interface module ..........................................................................................................5
Calibration ..................................................................................................................................6
Data communication ...................................................................................................................7
5.1
Protocol ...............................................................................................................................7
5.2
Examples .............................................................................................................................8
5.2.1
Performing a single point calibration ............................................................................8
5.2.2
Performing a multi-point calibration ............................................................................9
5.2.3
Retrieving the pH signal ............................................................................................. 10
5.2.4
Retrieving the temperature signal .............................................................................. 10
5.2.5
Retrieving the slope values ........................................................................................ 11
5.3
ASCII table ......................................................................................................................... 12
E7500347.02
ISFET pH-sensor kit
Technical guide
Contents
1
Advertisement
Table of Contents
Summary of Contents for SENTRON A120-001
-
Page 1: Table Of Contents
ISFET pH-sensor kit Technical guide Contents Description..........................2 Specifications ..........................3 Electrical connections........................4 Analog front-end module.....................4 AD Converter module ......................4 USB Interface module ......................5 Calibration ..........................6 Data communication ........................7 Protocol ..........................7 Examples ..........................8 5.2.1 Performing a single point calibration ................8 5.2.2 Performing a multi-point calibration ................9 5.2.3 Retrieving the pH signal ..................... -
Page 2: Description
Description Sentron offers a glass-free modular pH-kit designed specifically for development and testing purposes. With this pH-kit, development engineers and researchers have a large degree of flexibility in how they integrate our proprietary ISFET pH sensor into their applications or experimental set-ups. -
Page 3: Specifications
Specifications... -
Page 4: Electrical Connections
Electrical connections The diagram below illustrates how the components of the pH-kit are connected together. The modules will only function when connected in this order. 1. ISFET sensor + 2. Analog front-end 3. AD Converter 4. USB Interface Reference electrode (Optional) (Optional) ... -
Page 5: Usb Interface Module
3.3 USB Interface module The 4 pin connector of the USB Interface module can be attached directly to the AD Converter module. A mini USB cable can be attached to the mini USB B connector. Converter Mini USB B connector ... -
Page 6: Calibration
Calibration It is always necessary to calibrate an ISFET pH sensor before use. During prolonged use the senor may need to recalibrated at intervals. The frequency of recalibration is dependent on the conditions the sensor is subjected to and it is recommended to test the calibration at the end of a measurement run to confirm the calibration is still accurate. -
Page 7: Data Communication
Data communication Before connecting and powering up the modules in your embedded environment or to the computer make sure the all the necessary module are connected to each other and correct baud rate of 115k2 8N1 is set. See chapter 3 for power and data pins on the AD converter module when the USB interface is not connected and the communication is directly to the AD converter. -
Page 8: Examples
5.2 Examples Below some communication examples on the various protocol functions are presented to illustrate communication with the AD Converter and USB Interface modules. 5.2.1 Performing a single point calibration pH7 calibration sequence: Rinse the probe with deionized water. ... -
Page 9: Performing A Multi-Point Calibration
5.2.2 Performing a multi-point calibration To rule out erroneous multi-point calibrations, the calibration can only take place for an increasing or decreasing pH sequence. Multi-point calibration sequence: For example a calibration in pH 4 – 7 – 10 buffer. Rinse the probe with deionized water. -
Page 10: Retrieving The Ph Signal
5.2.3 Retrieving the pH signal After a single or multipoint calibration the AD Converter module the pH value can be read out. Retrieve pH value Send the command bytes: 999!<CR> Wait for the module to return the pH value, receive bytes: ABCDEFGHIJK Data ABCDEFGHIJK marks the byte position. -
Page 11: Retrieving The Slope Values
5.2.5 Retrieving the slope values A slope can only be calculated between two calibration points. When retrieving a slope after only a single point calibration the returned values will represent 0%. Normal slopes between two consecutive pH buffer solutions should be between 105% – 95%. Slopes outside these values, can indicate a polluted or aging ISFET sensor /reference electrode. -
Page 12: Ascii Table
5.3 ASCII table...
Need help?
Do you have a question about the A120-001 and is the answer not in the manual?
Questions and answers