Baker Hughes Panametrics XDP, Руководство пользователя

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4.4 Setting up the analog input
Use the instructions in this section to configure the manner in which the XDP responds to the 4-20 mA input signal
from the transmitter.
4.4.1 Entering calibration data
The XDP converts the 4-20 mA analog input signal from
the transmitter into either ppm or pcnt of the target gas for
output on the display. Program this conversion process by
entering up to nine data points on the conversion curve. To
accomplish this, navigate to the cal>1:cal>setup>cal data
menu and proceed as follows:
1. At the
cal data menu option press [ENTER].
2. Use the [

] and [

] keys to highlight the cal points
option and press [ENTER].
3. Use the [

] and [

] keys to set the value to the
desired number of data points (2-9). Press [ENTER].
4. Use the [

] and [

] keys to highlight the cal table
option and press [ENTER].
5. Using the four arrow keys, program the mA value and the
corresponding ppm/pcnt value for the first data point.
6. At the up/Down arrows symbol at the end of the data
line, use the [

] and [

] keys to move to the next
data point number.
7. Repeat steps 5 and 6 until all of the data points have
been entered.
8. Press [ENTER].
4.4.2 Setting the analog input error limits
The XDP system fault alarm is tripped whenever the
4-20 mA analog input signal is outside a specified
signal range. To program this range, navigate to the
cal>1:cal>setup>4-20mA input menu and proceed
as follows:
1. At the 4-
20mA input menu option press [ENTER].
2. Use the [

] and [

] keys to highlight the over range limit
option and press [ENTER].
3. Using the four arrow keys, program the mA value for
the upper end of the acceptable range (usually 20 mA).
Press [ENTER].
4. Use the [

] and [

] keys to highlight the under range
limit option and press [ENTER].
5. Using the four arrow keys, program the mA value for
the lower end of the acceptable range (usually 4 mA).
Press [ENTER].
If the system fault alarm is configured (see the next
section) and the error handler is enabled (see "Chapter 5.
Calibration" on page 27 ), the fault alarm will be tripped
and the designated error message will be displayed
whenever the analog input signal is outside the range
programmed above.