X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 14 Sep 2013 11:44:54 -0400 Message-ID: X-Original-Return-Path: Received: from qmta01.westchester.pa.mail.comcast.net ([76.96.62.16] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6475036 for lml@lancaironline.net; Sat, 14 Sep 2013 07:35:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.16; envelope-from=jmorgan1023@comcast.net Received: from omta22.westchester.pa.mail.comcast.net ([76.96.62.73]) by qmta01.westchester.pa.mail.comcast.net with comcast id QzXc1m0061ap0As51zaa5u; Sat, 14 Sep 2013 11:34:34 +0000 Received: from [192.168.1.102] ([24.11.157.196]) by omta22.westchester.pa.mail.comcast.net with comcast id QzaZ1m00U4EXR5U3izaaj3; Sat, 14 Sep 2013 11:34:34 +0000 From: Jack Morgan Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_A7358132-465C-4B55-B179-BA1AF4B7CB2C" Subject: Probably can use the standard MSP oil Pressure sensor X-Original-Date: Sat, 14 Sep 2013 07:34:33 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <221C8D3B-D5FA-4D4E-8EBB-255644058A80@comcast.net> X-Mailer: Apple Mail (2.1283) --Apple-Mail=_A7358132-465C-4B55-B179-BA1AF4B7CB2C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 I believe there is a good chance the 2 mv/psi unit could be used with a = resistor divider bringing it to 1mv/psi. I would be happy to discuss = this off list with anyone who has access to the sensor and VMS1000 unit. = The issue is getting the right values for the divider to give the = correct reading taking into account the resistances of the sensor/1000 = match. This may be preferable to continuing with a non standard sensor = configuration. Up to you guys who are using the 1000 if this is worth while. Jack Morgan On Sep 14, 2013, at 6:01 AM, Lancair Mailing List wrote: > 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.=20 > 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. > =20 > Bill Rumburg > N403WR (Sonic bOOm) =20 >=20 --Apple-Mail=_A7358132-465C-4B55-B179-BA1AF4B7CB2C Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1 I = believe there is a good chance the 2 mv/psi unit could be used with a = resistor divider bringing it to 1mv/psi. I would be happy to discuss = this off list with anyone who has access to the sensor and VMS1000 unit. = The issue is getting the right values for the divider to give the = correct reading taking into account the resistances of the sensor/1000 = match. This may be preferable to continuing with a non standard sensor = configuration.

Up to you guys who are using the 1000 = if this is worth while.

Jack = Morgan

On Sep 14, 2013, at 6:01 AM, Lancair = Mailing List wrote:

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)   


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