[TechAssist] Re: electrical instrument calibration
- From: "Art Bevilacqua" <abevilac@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 15 Jun 2004 21:47:29 -0400
I do a lot of work in power plants, where the process control systems =
are
similar to what would be seen in a water plant.
The job description is worded a little strangely, but what I'm guessing =
they
mean is calibrating process instruments, such as pressure transducers. =
What
happens is the instrument tech "excites" the process side of the =
instrument
with a range of pressures, and checks that the electrical output varies
linearly over a 4-20 ma range. If not, there are range and offset
adjustments to make. Newer electronic instruments communicate with the
process control computers over digital highways instead of the old =
current
loop method, and some are calibrated using little handheld programmers
instead of pots.
Output devices, such as current-to-pneumatic converts to drive control
valves need the same kind of adjustments.
Art Bevilacqua
Essex Radio and TV
40 Main Street
Essex, MA 01929
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of jonas miglinas
Sent: Tuesday, June 15, 2004 8:14 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] electrical instrument calibration
Hello all,
I have a friend whos son wants to apply for a job in a water reclamation
plant. Part of the job description says must be experienced in =
"electrical
instrument calibration". I'm not sure what this means when asked by the
young job seeker. Maybe someone on the list may have an idea and just =
what
instruments are involved in electrical calibration.
Jonas Miglinas
Miglinas TV
Chicago
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