Varec 2920, Инструкция по установке и эксплуатации, Страница: 85 / 194

5 Display and Configuration Interface
Varec, Inc. 75
Analog Input User Calibration
To calibrate the Analog Input do the following:
Warning! Obtain a hot working permit before beginning this procedure.
1. Connect a calibrated 4-20 mA current source to terminals AI & AI COM
2. Select Calibration from the Main Menu on the 2920.
3. Select Analog Input.
4. Set the Current Source to 8 mA and wait 5 to 10 seconds for signal to stabilize.
5. Press the E to accept the 8 mA value.
6. Set the Current Source to 16 mA and wait 5 to 10 seconds for signal to stabilize.
7. Press the E to accept the 8 mA value.
8. Press the C button twice to exit to the main menu.
9. Select Analog Input from the main Menu on the 2920.
10. Select Display menu.
11. Scroll the menu to the Value parameter.
Units The 4 to 20 mA signal, can be assigned a units
parameter. This is useful for units conversion and when
displaying a value on the LCD.
Possible Values are:
percent
m/s
2
undefined
ft
m
in
mm
16
th
ft-in-16
ft-in-8
°F
°C
°API
kg/m
3
lb/ft
3
in H
2
0
PSI
bar
Mbar
Pa
kPa
MPa
US Gal
l
m
3
bbl
gal/min
l/min
bbl/min
bbl/hr
m
3
/min
m
3
/hr
sec
min
hr
mA
Volts
mV
Ohms
All Params Lists all Display, Commands, and Config Params in a list.