"DSK" wrote in message
.. .
Scout wrote:
Thom,
you just reminded me of an old Croydon boy I worked at LBH with. He was a
carpenter but when things were slow in his area, he'd be my helper with
the HVAC controls.

Cool... he already had a hammer

.... We had lots of pneumatics. We later converted the controls to
digital but left the pneumatic actuators in place (to save some cash).

Everybody did that. Saved cash plus the first & second generation
digitally controlled linear actuators sucked. The ones they make now are
pretty good but don't trust their power ratings or their power consumption
specs.

The funny thing is that a lot of people justified the switch in order to
save on LP air system & compressor maintenance.


... When I left LBH and went to Rohm and Haas, he went to a local school
district for a job. He reported back to me that they wanted to know if he
knew anything about troubleshooting and calibrating pneumatic controls.
He said, "I can usually play with the settings enough to get them
working." That was not the answer they wanted to hear! Needless to say,
he didn't get the job.

That's where better test-taking skills would have made the difference. If
he'd tossed around a lot of words like "setpoint" and "proportional band"
he'd have been all set.

True!
He probably shouldn't have mentioned kerf when discussing cut-in and cut-out
setpoints.
Scout