UMSITRPDS3-1 On-Line Operation
November 2005
6-11
After adjusting, the measuring span specified on the rating plate may no longer match the new span.
A turn-down up to a maximum 1:100 (span ratio = r, turn-down) can be reached depending on the series
and the measuring range.
The relationship between the measured pressure and the generated output current is linear, except for the
square root characteristic in differential pressure transmitters.
Example:
1. Given: a transmitter with a measuring span of 0 to 232 psi. Adjust it to a measuring span of 29 to 203
psi without applying a reference pressure. (The assumed pressure will be zero psi or the lower sensor
limit whichever is greater.)
2. Press the M pushbutton to select mode 5.
3. Adjust zero to 29 psi by pressing the or pushbutton.
4. Press the M pushbutton to save the value and select mode 6.
5. Adjust full scale to 203 psi by pressing the or pushbutton.
6. Press the M pushbutton to save the value.
6.2.4.2 Practical Applications
Set zero and full scale (blind):
1. Select the pressure input engineering unit.
2. Press the M pushbutton to select mode 5.
3. Press the and pushbuttons simultaneously and hold for 2 seconds. Zero is set to lower sensor
limit.
4. Press the M pushbutton to save the value and select mode 6.
5. Press the or pushbuttons and hold for 2 seconds. Full scale is set to the upper sensor limit.
6. Press the M pushbutton to save the value.
Adjust zero and full scale (blind):
1. Select the pressure input engineering unit.
2. Press the M pushbutton to select mode 5.
3. Adjust zero by pressing the or pushbutton. This value will produce 4 mA.
4. Press the M pushbutton to save the input pressure value and select mode 6.
5. Adjust full scale by pressing the or pushbutton. This value will produce 20 mA.
6. Press the M pushbutton to save the input pressure value.
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