Hi Gerry,

Thank you for the helpful and exhaustive comments and reply. Just a quick one: how do I get to the plw.ini file?

Thanks,

glovisol

TECHNICAL DETAILS OF THE DD100 TEMPERATURE SENSOR AND DrDAQ MODE OF OPERATION When using the DD100 Temperature Sensor, the DrDAQ exploits the internal 100 KOhm pull-up resistor (Pin 1 of EXT 1) to feed the NTC resistor inside the probe, then reads the voltage across the NTC (beween Pin 1 and Pin 2 ...

Dear Jerry, The temperature compensation of the pH reading works only with the DD100 Temperature Sensor and with sensors based on an NTC (negative temperature coefficient) resistor having the same characteristic R-vs-T of the DD100. This happens because the internal, hidden and user not accessible c...

PH TEST RESULTS UNDER SAMPLE TEMPERATURE VARIATION The tests were conducted by reading the pH of buffer solutions graded 4.01 and 7.01. The solution for the test was placed inside a small plastic container placed inside a glass container. Water at a given temperature was then poured into the glass ...

Dear Gerry, I have connected the DD100 Temperature Probe to the EXT 1 input of the DrDAQ and can confirm that temperature variations as measured by the probe indeed automatically change the pH reading as shown on the pH channel. Perhaps you can explain how this is done.... I shall now check the Prob...

Dear Gerry, Thanks for your reply, which, unfortunately, does not help. Of course it is generally well known how to apply a temperature sensor to the EXT 1 input of the DrDAQ, in fact I mentioned I am using a DD100 temperature sensor. Moreover I have done extensive work and publication on this, pse ...

I am using the USB DrDAQ with a standard DD011 pH electrode and also have a DD100 temperature sensor. I understand that the pH electrode is calibrated by inserting readings taken from standard buffer solutions into a scaling table for the pH channel. All is clear up to this point and works well. But...

Hi Plastekgroup,

Maybe you could remote the sensor(s) and keep the logger near the PC, by using a twisted pair, as shown here below (description in 11 parts).

topic22131.html

Cheers,

glovisol

Hi Sporoman, A quick solution is to read Picolog data with an Excel file and build the alarm fuction there. Then you would have all alarms recorded and visible in the Excel file. For details see: https://www.picotech.com/support/topic21151.html https://www.picotech.com/support/post67651.html#p67651 ...

Notable additions to the capabilities of PICOLOG software would be: 1) Ability to operate the digital outputs (if available in the hardware) in programmable PWM mode. This mode of operation is now only possible with PICOSCOPE. 2) Ability to have the digital outputs (if available in the hardware) ope...

Hi Glovisol, A thermocouple is not a very good temperature sensor for the continual good accuracy monitoring required for most flow meter applications, as it has poor repeatability, instability, and reduced accuracy, which is why I was discussing options for using an RTD. Regards, Gerry Dear Gerry,...

Hi there. As far as I know theTC 08 can accept termocouples, but not Platinum Temperature sensors, because these have a much smaller dynamic range of resistance variation, so you have either to get another measuring unit (e.g. the PT 104) or change the PRT's to another sensor type or build an adapte...

ENTIRE RS485 COMMS SYSTEM TESTED ON ONE SINGLE LAPTOP With the methods outlined here: https://www.picotech.com/support/topic23801.html the entire RS485 COMM System (Master + Slave Micros) can be tested on just one PC, by using one "C" HD based IDE (1.6.7) and another IDE (1.0.6) based on an USB don...

...OOPS, FORGOT ABOUT ISOLATION With the Buffer/Isolator in operation and the two laptops connected to the mains through their PSU bricks, the resistance between the sensors' ground and the Picolog 1012 ground is virtually not measurable with a digital ohmmeter and in the order of tens of megahoms.

ADDITIONAL CONSIDERATIONS REGARDING THE I2C FACILITY It is not easy to make I2C work because of many different issues involved. Generally speaking, any I2C sensor device requires its own library and furthermore I2C itself requires the WIRE library. In the I2C sketch presented: sketch_Universal_Tran...