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Page 21 801P5 Smart Switch
TM
Scalable Readout: Option Q
With this option installed, you can change the scale factor of
the display to read in different units of pressure, or in
arbitrary numbers that you choose.
If your system is set up with pressures in bars, for example,
you might want the Smart-Switch
TM
display to show bars
instead of psig.
The r-Hi, r-Lo and .Loc menu functions allow you to scale
the readout to your preference. In the following example,
millibars are used:
You have a scalable 801P5 with the 15psig sensor. You
want to represent the pressure in millibars. The standard
conversion unit is 1 psi = 68.95 millibars.
You want to read zero for zero pressure, therefore,
r-Lo = 0.
Full-scale output pressure for the 801P5 for this example
is 15 psig. So, r-Hi = 68.95 x 15 = 1034.25 millibars,
which rounds to 1034. Therefore r-Hi should be set to
1034.
The unit now reads from 0 to 1034 millibars for 0 to
15 psig pressure. The accuracy is ± 2 millibars, which is
± 0.2% of 1034.
You can use the scalable readout to set the display to read
whatever units are most familiar to you, or arbitrary numbers
such as 0 to 10. With the 4-digit display, you can use
positive numbers to 9999, and negative numbers to -999 (for
fewer digits, use leading zeros).