IM_ONE_Safety-07
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16
NOTE:
Do not replace the One Series display module or pres-
sure sensor. Swapping these amongst devices will cause a
mis-match between the stored sensor calibration data and the
pressure sensor. For proper operation, the display module
serial number must always match the serial number inside the
enclosure (see Figure 18).
These serial numbers must match for proper operation.
DISPLAY MODULE CALIBRATION
SETTING THE SCALE
The 4-20 mA output is field scalable. The default setting is 100% of the sensor’s maximum range, where 4 mA represents minimum and 20 mA
is maximum range. If desired, both the 4 mA and 20 mA levels may be set independently to shrink or stretch the portion of the sensor’s range
represented by the 4-20 mA output.
• Setting the 4 mA portion of the scale (see Figure 17):
• Enter the Programming Mode (see page 10) and use the left
2
button to move to the 4MA SET command.
• Press the right
g
button to select a positive or negative scale. POS is the default. Use the left
2
button to change to NEG.
• Press the right
g
button to view and change the scale. Press the left
2
button to increment the blinking digit. Press the right
g
button to enter and move to the next digit. This process value must be between -3% and 25% of the sensor’s maximum range.
• Press the right
g
button to enter the new scale and return to the main menu.
• Setting the 20 mA portion of the scale (see Figure 17):
• Enter the Programming Mode (see page 10) and use the left
2
button to move the 20MA SET command.
• Press the right
g
button to select a positive or negative scale. POS is the default. Use the left
2
button to change to NEG.
• Press the right
g
button to view and change the scale. Press the left
2
button to increment the blinking digit. Press the right
g
button to enter and move to the next digit. This process value must be between 50% and 110% of the sensor’s maximum range.
• Press the right
g
button to enter the new scale and return to the main menu.
NOTE:
Scaling the 4-20 mA output over a smaller portion of the sensor’s range does not the increase the accuracy of the proportional output. A
2:1 turndown is possible using these commands.
Sensor Range
-3 to 25%
50 to 110%
4MA
20MA
0%
100%
Figure 17
Figure 18
