M-System's isolators are typically designed with
an input to output response time of 0.5 seconds (0 - 90%). The reason
why this response time was chosen is that control system response
specifications for most process industry manufacturing plants are
relatively low.
Therefore, it is not useful for other system components, such as signal
conditioners, to have a fast response time. In addition, spikes and
other noise that come from power lines can make a control system unstable.
An isolation unit that does not have a high speed response can reduce
noise in this case by simply ignoring the spike due to the response
time being slower than the noise spike.
There are certain circumstances when a high speed response isolator
is needed; data acquisition, dynamic control algorithms, etc. M-System's
model M2VF has a response time of 180 µsec. (0 - 90%), and model
SVF has a response time of 500 µsec. (0 - 90%) with a frequency
response of DC to 2 kHz (-3 dB). The tradeoff for fast response time
is usually input noise filtering. When using a fast response unit,
it is recommended to protect against input noise by using shielded
twisted-pair cable, high quality ground wiring, etc.
M-System has a flexible solution to meet your specific application
and requirements. Consult our Signal Conditioners Data Library. |
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We
have a requirement for a contact signal from the field to be input into
a computer. Can M-System's Model M2VS handle this?
No,
but a Pulse Isolator Model M2PP can handle this function.