Re: [foxboro] My RTDs don't go below zero

The SCI of 42 has a range of 0 to 620 degrees Celsius.  For a span below
zero with a 100 ohm platinum RTD, you need to use SCI of 43 or 44.  The SCI
43 is for an IEC RTD curve and the SCI 44 is for a SAMA RTD curve.  Both SCI
have a range of -200 to 620 degrees Celsius.

Gary M. Jones
James-Mangan Automation
Phone:  (979) 265-5556
Fax:   (979) 265-5502
Cell:   (979) 480-4072

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]On
Behalf Of ZIEGLER, JOHN E
Sent: Tuesday, February 25, 2003 9:05 AM
To: Foxboro Mailing List (E-mail)
Subject: [foxboro] My RTDs don't go below zero


We have found that our RTDs don't read below zero.  Is there some I/A or =
instrument related issue that can explain this?

Our RTDs are directly wired to an FBM03.  The AIN block has an SCI of =
42.  It has a scale configured to show -10 deg C to 150 deg C.  We are =
using 6.1.1 software.

When the measured temperature is below 0 deg C, the block shows I/O bad.

Thank you for your help.

Jack Ziegler
Sunoco Chemicals
Frankford Phenol Plant
Margaret & Bermuda Sts
Philadelphia, PA 19137
215-537-2455
JEZiegler@xxxxxxxxxxxxx=20



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