11
Reference Manual
00809-0100-4378, Rev CE
Section 2: Installation
February 2014
Installation
2.3 LCD display configuration
The 20-segment bar graph is factory calibrated and represents 4–20 mA directly, but the end
points of the LCD display are user-definable. The meter requires a current between 4 and 20 mA
in order to be scaled, but the actual value of the current is not significant.
2.3.1 Remove the cover
1. Unscrew and remove the transparent housing cover from the
LCD display body.
Note
The LCD display time-out is approximately 16 seconds. If you do not press the configuration
buttons within 16 seconds, the indicator will revert to reading the current signal.
2.3.2 Position the decimal point and select the meter function
1. Press the left and right configuration buttons simultaneously and release them
immediately.
2. To move the decimal point to the desired location, press the left configuration button.
Note that the decimal point wraps around.
3. To scroll through the mode options, press the right configuration button repeatedly
until the meter displays the desired mode (See Ta ble 2 -1).
Table 2-1. LCD display mode options
Explosions can result in death or serious injury. Do not remove the instrument cover in
explosive environments when the circuit is alive.
Options Relationship between input signal and digital display
L in Linear
LinF Linear with five-second filter
Srt Square root
SrtF Square root with five-second filter
Square root function only relates to the digital display. The bar graph output remains linear
with the current signal.
Square root response
The digital display will be proportional to the square root of the input current where 4 mA = 0
and 20 mA = 1.0, scaled per the calibration procedure. The transition point from linear to
square root is at 25 percent of full scale flow.
Filter response operates upon “present input” and “input received in the previous five second
interval” in the following manner:
Display = (0.75 ⫻ previous input) + (0.25 ⫻ present input)
This relationship is maintained provided that the previous reading minus the present reading
is less than 25 percent of full scale.
To Next Page
Loading...