Take me home
CDi3.FTe Submersible, Universal Gas-Field Controller
Keller Digital Pressure Transducers/Transmitters
Burkert Solenoid Modifications
PDL/CDi History: Pembina Lake Erie Datalogger
LD Series Pressure Transmitters
PDL/CDi History Version 1.0: PDL1 to PDL4 Datalogger
PDL/CDi History Version 1.0: PDL5
PDL/CDi History Version 1.0: CDi2/PDL6, the PDL that Wasn't
PDL/CDi History Version 1.0:
PDL/CDi History Version 1.0: Pembina Lake Erie Datalogger
PDL/CDi History Version 1.0: P5 Switcher
PDL/CDi History Version 1.0: P7 Switcher
PDL/CDi History Version 2.0

PDL/CDi History Version 1.0: ZDL5 Switcher
PDL/CDi History Version 1.0: CDi3.FTe Switcher
PDL/CDi History Version 1.0: CDi3.RMe Switcher
PDL/CDi History Version 1.0: Remote 900 MHz RF Link
PDL/CDi History Version 1.0: CDi99 Libby Flow Meter
PDL/CDi History Version 1.0: They Live!!! PDL5 Becomes ZDL5!!! (Zombie Data Logger)
ZDL5.FTe Switcher
Click image for larger picture
  • Lake Erie datalogging and control operations went digital when five P7s were built and eventually installed in June, 2011. Naturally, due to the absolute superiority of the original digital P7s when compared with the P5s, it had been assumed around here that we would go forward with the digital stuff. I made two mistakes in 2011, 1) I told them the Kellers could operate in analogue mode as well as digital at the same time, and 2) although the P5 and P7 boards are very different, when the assembly is complete the two units "look" the same. As a result, instead of staying with the digital stuff and going forward from there, an apparent arbitrary decision was made, arbitrary because nobody actually asked yours truly what the difference was, so state-of-the-art Kellers were bought and made to operate in analogue mode with the old P5 boards. Sacrilege!
  • The idea for the ZDL came around Halloween 2015, there was plenty of old PDL5s laying around in a "place" affectionately known around here as the "PDL Cemetery", you know, where PDLs go to die, and this place has been the cause of many laughs over the years. The good old NSC800, the CPU chip in the PDL, had gone obsolete way back in 1997 and the DS1386 RTC, the Real Time Clock, did not survive long after the year 2000 scare as it didn't have a century register, but what if the lithium battery in the RTC could be replaced, and what if the two communication lines could be switched in the UART, Universal Asynchronous Receiver Transmitter, to support a "switched" RS485 circuit? If it were possible to do those two things we could have a "digital" PDL, a PDL that "reads" the Keller transmitters digitally, one that could be supported in perpetuity.
  • It was certainly worth a try, but a "switcher" PDL5 would certainly not be possible since there is a 32k program chip on the PDL5 board and the latest "switcher" program, #6214, was over 30k, in other words, there probably wasn't enough room to add the Keller digital routines to the program.
  • Given the above, it would probably never had been attempted but curiosity is one hell of a motivator sometimes, and so during summer 2016 such a board was modified and the firmware/software was updated, sample1, sample2, sample3.
  • Testing of the board showed great promise, the Keller singles are outstanding pressure transmitters, their performance "stunning", and all this "stunning" performance was the reason for the transformation of the CDi3.FTe, two of which were installed in sour service in early October, 2016.
  • Curiosity kicked in again in the Spring of 2017, and after much code optimization, the ZDL5 Switcher was born with 200 bytes to spare in the program chip, prototype installed June 9th, 2017 at 40R.
  • Since the ZDL Switcher beats the PDL Switcher in every category, and since there are upwards of 40 of these laying around in the "PDL Cemetery", nobody is laughing any more... but hey, if you want to go against the lake Erie roadmap, which now includes road signs, if you want to go backwards you can now do it in style!

Current ZDL Switcher page. The Maytag Man, June 22nd, 2017

Original idea, around Halloween 2015
Original VR switchers from 2007 #97 and #98
DS1386 RTC, battery exposed
DS1386 RTC comparison
Original board and potting
Original board and potting
Original board assemly, side potting removed
Board changes
Ready for potting
Close up. RTC and backup batteries have been removed
Masking one side
Sides potted, external backup battery
PVC box finished
In the box
All done!
Thank you TLM!
Thanks again, TLM!
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Copyright © 1991-2017 AdamG Last Update: Tuesday, September 19, 2017 2:46:07 PM