## Search found 273 matches

Mon Dec 05, 2016 2:24 pm
Forum: Applications
Topic: THE MG-811 FOR METERING & RECORDING CO2 WITH THE DrDAQ
Replies: 7
Views: 8543

### Re: THE MG-811 FOR METERING & RECORDING CO2 WITH THE DrDAQ

Sensor Theory & Excel calculator (2) Sensor out Vs. CO2.jpg FIGURE 1 shows the mathematical relationship between the CO2 concentration C in air, expressed in PPM and Sensor cell output voltage when Vo and Vc for the individual cell have been measured. The three equations are shown below together wi...
Fri Dec 02, 2016 2:44 pm
Forum: USB DrDAQ
Topic: Sensor for CO2 concentration in air with the DrDAQ
Replies: 0
Views: 3091

### Sensor for CO2 concentration in air with the DrDAQ

Information can be found here:

topic27251.html
Fri Dec 02, 2016 12:50 pm
Forum: Applications
Topic: THE MG-811 FOR METERING & RECORDING CO2 WITH THE DrDAQ
Replies: 7
Views: 8543

### THE MG-811 FOR METERING & RECORDING CO2 WITH THE DrDAQ

THE MG8-11 CO2 SENSOR MODULE APPLIED TO THE DrDAQ CO2 Sensor MG-811.jpg SUMMARY Introduction Sensor theory & Excel calculator Sensor signal conditioning circuit (buffer) & other hardware DrDAQ application CO2 Sensor operation Additional technical information Temperature behaviour and aging INTRODUC...
Mon Nov 28, 2016 10:12 am
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

ELECTRODE CALIBRATION It is good practice to calibrate the electrode before doing pH measurements. For reliable calibration it is essential to do it with a stable ambient temperature of 25°C and to have all components, probes, buffers, etc. at the same temperature within +/- 2°C. Calibration is don...
Sun Nov 27, 2016 9:25 am
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

MORE EXAMPLES
Math pH54.PLW
PLW file of low pH example
Math pH24.PLW
PLW file of high pH example
Sat Nov 26, 2016 4:41 pm
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

PH ELECTRODES - CARE & LIMITATIONS Low cost pH electrodes such as the Picolog DD011 and others freely available on Internet require handling precautions and have basic limitations. Here is a limited list. 1. Testing them at 25°C ambient with a neutral (pH = 7) buffer, their output is not zero, but ...
Sat Nov 26, 2016 2:14 pm
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

BUILDING SENSORS FOR pH TEMPERATURE COMPENSATION [/size][/color] One of the advantages of the MATH COMPENSATION method is that all individual steps on the calculation of the TRUE pH can be monitored from the Picolog console. Another advantage is that different sensors apart from the DD100 can be us...
Thu Nov 24, 2016 9:33 am
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

PRECISION pH MEASUREMENT & RECORDING WITH THE DrDAQ MathpHXX window.jpg The Picolog calculation described in the previous post can be verified with the "pH Electrode Temperature Dependence" Excel file uploaded in a previous post. 1) In the TEMP column D, in place of "30" write "31" °C. 2) In the mV...
Thu Nov 24, 2016 7:45 am
Forum: USB DrDAQ
Topic: TEMPERATURE COMPENSATION OF pH READINGS?
Replies: 13
Views: 8652

### Re: TEMPERATURE COMPENSATION OF pH READINGS?

As previously stated, work on this subject is now available in the "APPLICATIONS" section.

Topic 27111

GLOVISOL
Wed Nov 23, 2016 4:39 pm
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

PRECISION pH MEASUREMENT & RECORDING WITH THE DrDAQ MATH TYPE COMPENSATION With Math Compensation we can use any temperature sensor capable of an output voltage in the range 0 – 2.5 V into an impedance value of 1 kOhm or less (like the LM35 IC) connected to EXT 1. In a separate post construction & ...
Tue Nov 22, 2016 7:01 pm
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### Re: PH MEASUREMENTS WITH THE DrDAQ

PRECISION pH MEASUREMENT & RECORDING WITH THE DrDAQ Comparing comp. methods.jpg PICO TYPE COMPENSATION The simplest way to do the pH measurement is to plug the pH electrode into the BNC socket of the DrDAQ, calibrate with at least one buffer solution with a pH near the expected pH of the sample, se...
Mon Nov 21, 2016 4:20 pm
Forum: USB DrDAQ
Topic: TEMPERATURE COMPENSATION OF pH - ANNOUNCEMENT
Replies: 0
Views: 3149

### TEMPERATURE COMPENSATION OF pH - ANNOUNCEMENT

AS PREVIOUSLY STATED, WORK ON THIS SUBJECT IS NOW AVAILABLE IN THE "APPLICATIONS" SECTION.

topic27111.html

GLOVISOL
Mon Nov 21, 2016 3:56 pm
Forum: Applications
Topic: PH MEASUREMENTS WITH THE DrDAQ
Replies: 7
Views: 6448

### PH MEASUREMENTS WITH THE DrDAQ

PRECISION pH MEASUREMENT & RECORDING WITH THE DrDAQ pH71-2.jpg INTRODUCTION The DrDAQ is equipped with a quality, high impedance BNC input port which accepts a standard pH electrode. The stability and accuracy of this hardware, coupled with the parameter calculation capability of Picolog, affords a...
Fri Oct 28, 2016 1:42 pm
Forum: USB DrDAQ
Topic: TEMPERATURE COMPENSATION OF pH READINGS?
Replies: 13
Views: 8652

### Re: TEMPERATURE COMPENSATION OF pH READINGS?

ADDITIONAL ADVANCE INFORMATION ON pH OPERATION Works is being done to obtain a complete description of the operation of the DrDAQ in the pH measurement mode, thus completing the info already given in the previous postings. I shall publish this information at the conclusion of this work. In the mean...
Mon Oct 17, 2016 4:37 pm
Forum: USB DrDAQ
Topic: TEMPERATURE COMPENSATION OF pH READINGS?
Replies: 13
Views: 8652

### Re: TEMPERATURE COMPENSATION OF pH READINGS?

I need to perform a check and, if the the functionality of the temperature compensation switch has been removed (or not initially implemented), I'll put in an enhancement request for PicoLog to enable compensation via an external temp sensor. Hi Gerry, I fear there is a misunderstanding....At prese...