97
Communication setup
5.
Select an analog Input Channel (e.g., channel 1, 2, 3, or, flow, etc.) to assign to that
output. Press
CHANGE CHOICE
to cycle through the channel names. When the
desired channel is displayed, press
ACCEPT
.
6.
Assign a channel value to the 4 mA current value. This value is typically 0, however
any value can be set. Enter the value of the input needed to generate 4 mA of current
at the output.
7.
Assign an input value to the 20 mA current level.
8.
Repeat this process to configure the other 4–20 mA output.
8.3.2 4–20 mA calibration
After wiring the 4–20 mA connection perform a 4–20 mA output calibration. The 4–20 mA
output calibration requires a multimeter and an interface or access to the 4–20 mA
current loop wiring. Two 4–20 mA outputs are available and are designated Output A and
Output B. Both outputs are calibrated the same way and are isolated from each other.
Calibration may be performed while the 4–20 mA device is in the current loop, as shown
in
. Calibration may also be performed with the device disconnected
from the current loop as shown in
. In either case, the multimeter must be set to
a 20 milliamp dc range or greater.
1.
From the Main Menu, select
OPTIONS, ADVANCED OPTIONS, CALIBRATION, 4–20 MA
OUTPUTS.
2.
Connect a multimeter to the 4–20 mA current outputs per
3.
Make sure that the 4–20 mA output is enabled. If it is not enabled, press
CHANGE
CHOICE
so that the display shows Enabled and press
ACCEPT
.
4.
Select the Output (A or B) to calibrate.
5.
Press any key to set the selected output to 4.00 mA dc.
6.
Measure the current on the selected output using the multimeter and enter the
measured value using the numeric keypad. Press
ACCEPT
.
7.
Press any key to set the output to 20.00 mA dc.
11:00 AM 21 - APR - 01
4–20 mA OUTPUTS
ACCEPT
CHANGE
CHOICE
INPUT CHANNEL:
CANCEL
FLOW
SELECT APPROPRIATE UNITS
11:00 AM 21 - APR - 01
4–20 mA OUTPUTS
ACCEPT
4 mA INPUT VALUE
CLEAR
ENTRY
0.00 mgd
CANCEL
SELECT APPROPRIATE UNITS
Goodnal STP ST041 Pre Treatment (Sigma 900 MAX All Weather Refrigerated Sampler) Vendor Manual
Q-Pulse Id VM373
Active 29/10/2013
Page 97 of 122
