Q:
I
am considering designing the PPT into my product
but want to be sure it works in the application.
Can I get a sample for breadboarding and evaluation?
A: Honeywell supplies consignment PPT
units to potential purchasers through our
local sales representatives for each territory.
We ask that the units be returned undamaged
or purchased after 4 weeks. Contact the factory
for information on your local representative.
Refer to key contacts section. |
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Q:
Do I have to use the PPT with a computer?
I'm only interested in the analog output and
don't want to bother with computer configuration.
A: The PPT is configured at the factory
to output analog pressure measurements from
the time it is powered up. No computer interface
is required if the factory default settings
provide the data you require. |
| |
Q:
I want the PPT setup to operate in a special
way which is not the same as the factory default
settings (i.e., a higher update rate), but
I still don't want to bother with interfacing
to a computer. Will the factory do special
unit setups?
A: Yes, we will set up the PPT in a
special configuration at the factory. |
| |
| Q:
I like the PPT family's overall features,
but for my application I need something different
from what your spec sheet lists. My needs
are: |
| |
Different
full scale pressure
Different
pressure connection
Frequency
output
Wider
temperature range
Higher
accuracy
Reconfigured
housing
Some
other feature not listed
Can
you still help me? How much will it cost?
|
| A:
Honeywell supplies a number of customized
configurations of the PPT to customers who
need nonstandard units. It is impossible to
provide a precise answer to the question of
cost because this depends on the nature of
the modification and the quantity desired.
We charge customers anywhere from $15 per
unit for very simple pressure connector changes
to a few hundred dollars per unit for special
accuracies and more complicated hardware modifications.
Please contact Customer Service to discuss
your specific needs at 612-954-2888. |
| |
Q:
What
is the technology of the sensing element in
the PPT?
A: The PPT family uses a micromachined
silicon chip with piezoresistive strain gauges.
These are manufactured in our facility in
Minnesota. Honeywell was one of the first
companies to develop highly stable and repeatable
pressure sensors using this technology, and
we still consider our piezoresistive sensors
to offer the best performance in the world
today. |
| |
Q:
Is there a factory calibration service?
A: Honeywell will perform recalibrations
for any PPT. Contact Customer Service.
|
| |
Q:
Can I calibrate the PPT at my facility?
A: The PPT can be fully calibrated
by the user for null and sensitivity using
the RS232/RS485 communication options. Please
refer to the User's Manual. |
| |
Q:
Do you supply Calibration Certificates?
A: Upon request, we will supply a Calibration
Certificate with any unit. All of our calibration
equipment is NIST-traceable. |
| |
Q:
What about media compatibility?
A: This chip is exposed directly to
the media for the basic PPT and is isolated
by a secondary stainless steel diaphragm in
the PPT-R. We specify dry, noncorrosive, nonconducting
gases for the basic model and materials compatible
with SS316 for the PPT-R. The basic model
is commonly used in air, even though air in
some circumstances will carry water vapor.
The exact nature of the application and the
type of sensor (absolute, gauge, differential)
will affect the suitability of the PPT for
measuring air pressures. These can be discussed
with our applications engineering.
|
| |
Q:
When I turn on my differential unit, I
get 2.5V on the analog output with zero applied
pressure. Why?
A: PPT differential units are true
+/- differentials. Many firms refer to these
as compound sensors. For PPT differential
sensors, the 0-5V analog output swing is divided
to swing from 2.5 to 0 volts when operating
in the "minus" pressure mode and 2.5 to 5.0
volts operating in the "plus" pressure mode.
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