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)