Roger-

The Vision Microsystems VM1000 obtains oil and fuel pressure by
sending 5VDC to a transducer, which returns a 0 to 50 millivolt signal
thats linearly proportional to pressure. All pressure transducer's
function in a similar manner; however, there are several variations on
the voltage transmitted and the type of electrical signal that's
returned. Other systems -including your's- might use that same
combination, but it's unlikely. You'd have to know the electrical
parameters for the pressure transducers employed by your MFD before
seeking a substitute. MFD manufacturer's tend to keep those a secret
in order to make you a captive customer for replacement transducers.

Bill Rumburg
N403 (Sonic bOOm)

----- Original Message -----
FROM: Roger Iverin
TO: lml@lancaironline.net
SENT: Wednesday, September 18, 2013 8:32 AM
SUBJECT: [LML] Re: Replacement VMS1000 Fuel and Oil Pressure
Transducers

Hi,

Are this ones universal and will work on any MFD or monitor?

Roger

On 17.09.2013 22:40, william rossmann wrote:

Okay Bill put me in for the 50 and the 100..
Bill

FROM: William Rumburg <lancair403@verizon.net>
TO: lml@lancaironline.net
SENT: Tuesday, September 17, 2013 7:42 AM
SUBJECT: [LML] Re: Replacement VMS1000 Fuel and Oil Pressure
Transducers

Bill-

MSP quoted $138 for a quantity of 1-9 and $125 for 10-50, with a lead
time of 10-12 weeks and a minimum quantity of 5. These MSP's are high
quality, direct-replacements for the Honeywells at less than 1/3rd the
price. Another advantage is that they are furnished with 4 or 10 ft
pigtails, so they can be directly connected to the DPU; no
intermediate plug is necessary. It would be a smart move to purchase
both a 50 and 100psi sensor for immediate replacement of the
Honeywells or just to have them handy should (when) the Honeywells
fail.

Bill Rumburg
N403WR (Sonic bOOm)
----- Original Message -----
FROM: william rossmann
TO: lml@lancaironline.net
SENT: Monday, September 16, 2013 7:52 AM
SUBJECT: [LML] Re: Replacement VMS1000 Fuel and Oil Pressure
Transducers

Hi Bill are both 50 and 100psi MSP sensors $120.00 each..
Regards Bill

FROM: William Rumburg <lancair403@verizon.net>
TO: lml@lancaironline.net
SENT: Friday, September 13, 2013 9:36 PM
SUBJECT: [LML] Replacement VMS1000 Fuel and Oil Pressure Transducers

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 [1]
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)



Links:
------
[1] http://www.meas-spec.com/downloads/US300.pdf