509-7X Series Universal III™ Transmitter
30
3.8.1 Point Calibration
The Point to Point method of calibration is the most accurate
way to calibrate the transmitter with two level points. The
high or low level must be known and should be held steady
for accurate calibration. They may be any two points at
more than 10% apart, and need not be the 4mA or 20 mA
points.
The Point Calibration pop-up window is accessed by
clicking on the menu "button" Point Calibration. Either a
high point or a low point can be entered rst.
A. Type in current value as the high point of the two point
calibration.
B. Click on Hi Point or press Enter (or Tab) on the keyboard.
High point calibration is now complete.
C. Move level in vessel a minimum of 10%.
D. Type in that value for Low Point of the two point
calibration.
E. Click on Low Point or press Enter (or Tab) on keyboard.
Low point calibration is now complete.
3.8.2 Level Calibration
Level calibration uses zero and span capacitance values as
the calibration data . These values can be obtained from
the AMETEK Drexelbrook Service department (or from
a previous calibration or identical application). Please be
prepared when you call (1-800-527-6297) with the purchase
order number and the serial number of the transmitter.
A. Go to Level Calibration area of the menu.
B. Enter Lower Level value. Press Tab or Enter.
C. Enter Lower Capacitance value. Press Tab or Enter.
D. Enter Upper Level value. Press Tab or Enter.
E. Enter Upper Capacitance value. Press Tab or Enter.
F. Click on Write to Transmitter.
3.8.3 Application Example
Example of an application using the PC software.
(Application Data)
• Vertical Tank
• No Damping
• Caustic or Acid Material in Tank Sensing Element:
700-5-54, Model Code: 74 (See Section 1.4)
• Span Range Switch factory set to 4
• Maximum Capacity of Vessel = 1200 gallons
• Maximum Size of Vessel = 20 feet
• 4 mA (LRV) = 0 gallons
• 20 mA (URV) = 1185 gallons [19.5 feet]
• Point Calibration done using two known level points:
• Lo Cal = 3 feet [selected level]
• Hi Cal = 16 feet [current level]
Figure 3-11
Level Calibration area of
Menu Screen
Figure 3-10
Point Calibration from Menu
Screen
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