4 - 20mA output
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Posts: 46,084
Hello, I have an auto engine hooked up to a dynamometer to measure
torque. The i/p to the stamp will be from a prox. on the flywheel.
The o/p needed from the stamp is 4 - 20ma, to control a
proportional valve which in turn controls the water flow to
a 'turbine' mounted on the engine drive shaft. So the
faster the engine goes, the water valve opens more and more load is
applied to the engine. I have
looked at a 0 -10v o/p from a digital pot but wondered if a 4 -
20mA output s possible? I have not bought a valve yet so not sure on
what tyoe of control signal it requires. I wonder if anyone has
ideas on this type of application? I also may need a pot. on the
valve as feed back so the stamp knows the position of the valve.
torque. The i/p to the stamp will be from a prox. on the flywheel.
The o/p needed from the stamp is 4 - 20ma, to control a
proportional valve which in turn controls the water flow to
a 'turbine' mounted on the engine drive shaft. So the
faster the engine goes, the water valve opens more and more load is
applied to the engine. I have
looked at a 0 -10v o/p from a digital pot but wondered if a 4 -
20mA output s possible? I have not bought a valve yet so not sure on
what tyoe of control signal it requires. I wonder if anyone has
ideas on this type of application? I also may need a pot. on the
valve as feed back so the stamp knows the position of the valve.
Comments
outputting a pulse every rev. Could you then count the number of rev's with the
stamp and output to a serial D/A converter this number that could be turned into
a voltage and then a 4-20 ma current? Sounds like a neat project.
Leroy Hall
http://home.fuse.net/leroy
Original Message
From: <andy@p...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, February 23, 2003 5:32 AM
Subject: [noparse][[/noparse]basicstamps] 4 - 20mA output
: Hello, I have an auto engine hooked up to a dynamometer to measure
: torque. The i/p to the stamp will be from a prox. on the flywheel.
: The o/p needed from the stamp is 4 - 20ma, to control a
: proportional valve which in turn controls the water flow to
: a 'turbine' mounted on the engine drive shaft. So the
: faster the engine goes, the water valve opens more and more load is
: applied to the engine. I have
: looked at a 0 -10v o/p from a digital pot but wondered if a 4 -
: 20mA output s possible? I have not bought a valve yet so not sure on
: what tyoe of control signal it requires. I wonder if anyone has
: ideas on this type of application? I also may need a pot. on the
: valve as feed back so the stamp knows the position of the valve.
:
:
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:
Belimo has a very good line of valves that can accept either voltage and or
current. In addition they have feed back options available. Sorry I can't help
with your main question, I too would be interested with any information you
receive on the 4-20mA output from a stamp.
Good luck,
Troy S
"andyfree86 <andy@p...>" <andy@p...>
wrote:Hello, I have an auto engine hooked up to a dynamometer to measure
torque. The i/p to the stamp will be from a prox. on the flywheel.
The o/p needed from the stamp is 4 - 20ma, to control a
proportional valve which in turn controls the water flow to
a 'turbine' mounted on the engine drive shaft. So the
faster the engine goes, the water valve opens more and more load is
applied to the engine. I have
looked at a 0 -10v o/p from a digital pot but wondered if a 4 -
20mA output s possible? I have not bought a valve yet so not sure on
what tyoe of control signal it requires. I wonder if anyone has
ideas on this type of application? I also may need a pot. on the
valve as feed back so the stamp knows the position of the valve.
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and Body of
the message will be ignored.
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