A
couple of years ago, I made a
post identifying a superior
-and much lower cost- Measurement
Specialties Products
(MSP) transducer as a replacement
for the Honeywell MediMate
transducer that the VMS 1000 employs
for fuel pressure indication. Some
tried to use that same transducer
for oil pressure and reported that
it didn't work, yielding a value
twice the actual oil pressure. Here's why:
The 50
psi Honeywell unit that VMS employed
for fuel pressure has a 50mV full
output, which equates to 1mV/psi. The 100 psi
MSP unit that I recommended has a
100mV full output, which also
equates to 1mV/psi; so it functions
perfectly as a replacement for *fuel
pressure*.
The 100
psi Honeywell unit that VMS employs
for oil pressure also has a 50mV
full output but, in this case,
that equates to .5mV/psi. With it's 1mV/psi
output, the same MSP unit will not
function for oil pressure; it causes
an indication double the actual oil
pressure.
As stated in my post a couple of
years ago, the Honeywell MediaMate
is older and inferior technology,
prone to failure, and -at over $400-
is outrageously priced. In contrast,
the MSP unit is compact, superior
and modern technology at only $120.
There's
another, almost identical MSP unit
that has a 50mV full output and,
consequently, will function
perfectly for fuel and oil pressure
in it's 50 and 100 psi versions.
Here's the spec sheet: http://www.meas-spec.com/downloads/US300.pdf
Problem
is that the combination of it's 5VDC
supply voltage and 50 mV
output is rarely utilized in
industry, so there aren't now any
available. However, I contacted one
of MSP's distributors and they
appear willing to place an order for
the 10 unit minimum, provided that
there's interest.
Let me
know if you're interested, even to
purchase one now for future use if
your current transducer should fail.
Bill
Rumburg
N403WR
(Sonic bOOm)