Calibration Instruction Manual
Emerson 475 Field Communicator
Manual Revision FC.2
ABM 2 Wire Radar with HART
©ABM Sensor Technologies Inc 2013, all rights reserved.
Emerson is a registered trademark of Emerson Process Management.
HART is a registered trademark of the HART Communication Foundation.
2
Contents
ABM 2 Wire Radar with HART ....................................................................................................................... 2
Introduction .................................................................................................................................................. 4
Section 1: Getting Started ............................................................................................................................. 4
Section 2: Changing Calibration Values ........................................................................................................ 7
Changing Calibration Values from the Home Screen................................................................................ 7
Using Device Setup to Change Calibration Values .................................................................................... 9
Device Setup  Basic Setup  Range Values ........................................................................................ 10
Device Setup  Basic Setup  Unit of Measure ................................................................................... 10
Device Setup  Basic Setup  Damping ............................................................................................... 11
Device Setup  Diag/Service  4mA and 20mA Calibration ................................................................ 11
Warnings Screens.................................................................................................................................... 14
Non-zero Status Screens ......................................................................................................................... 15
Section 3: Reviewing Calibration Settings................................................................................................... 16
Appendix A: Quick Reference – Short Cut to Range Values ....................................................................... 17
Appendix B: Quick Reference – Menu Path to Common Calibration Values.............................................. 18
Appendix C: Quick Reference – Menu Path to 4mA and 20mA Calibration ............................................... 19
3
Introduction
The following instructions describe how to calibrate an ABM 2 wire Radar with HART using an Emerson
475 Field Communicator. The 475 Field Communicator used for this document contained system
software version 3.7. In this document the Emerson 475 Field Communicator will be referred to as the
“475 Communicator”. For additional information on the operation of the 475 Communicator please
refer to the user manual.
In this document bold highlighting is used to when referring to a screen name, menu name or menu
item on the 475 Communicator. Menus in the 475 Communicator are displayed as a numbered list. In
order to activate a menu item you must use the keyboard and enter the number associated with the
menu item. For example to select the menu item “1 Device setup“, you must press the number 1 on the
keyboard. Tapping on the screen will only highlight the menu item.
Section 1: Getting Started
1-1
Connect power to your ABM HART enabled Radar. Figure 1 shows a wiring diagram, the
required load resistor and loop voltage.
The 475 Communicator requires
the Loop voltage to be a minimum
of 21 VDC*.
Connect 475
Communicator to
HART Loop here
+
Power Supply
21 to 30 VDC
-
Load Resistor 250 Ohms
Radar
* Load Resistor
Emerson specifies a minimum load resistor of 250 Ohms for the 475 Communicator
to function properly. At 250 Ohms the loop voltage must be a minimum of 21 VDC.
Figure 1 shows how to connect power to the ABM Radar.
4
1-2
Power on the 475 Communicator by pressing and holding the power key until the green light on
the power key blinks.
1-3
From the main menu tap the HART icon. The HART icon can be seen in the upper left corner of
Figure 2.
Figure 2 shows the main screen of the 475 Communicator.
1-4
The 475 Communicator will request the manufactures code and model number from the Radar
unit. The information is used to load a device descriptor if one is installed on the Communicator.
If a device descriptor is not installed the 475 Communicator will use the HART universal and
common commands to program the Radar. Figure 3 shows the message displayed when a
device descriptor is not found.
Figure 3 shows the 475 Communicator screen when a device descriptor file is not found.
1-5
Tap the “YES” button on the bottom left side of the screen (Figure 3) to proceed. The next
screen shown on the 475 Communicator is referred to as the “HOME” screen. Figure 4 shows
the home screen. The home screen displays the Radar calibration values, the target distance and
loop current. The primary variable (PV) in Figure 4 is the target distance at 3.442 feet. The PV
Loop current is 19.507mA. The PV lower range value (LRV), and upper range value (URV)
represent the Radar range calibration values.
5
Figure 4 shows the home screen.
1-6
The home screen communicates continuously with the Radar providing up-to-date
measurement and loop information. An alternative screen shown in Figure 5 (far right) can be
displayed by following the menu selection shown.
Figure 5 show the menu selections required to view the Primary Variables screen.
6
Section 2: Changing Calibration Values
The 475 Communicator provides multiple screens and menus for calibrating the Radar. The Radar range
can be calibrated from the home screen using menu items “4 PV LRV” and ”5 PV URV” or by entering
“1 Device setup“. Changing the range from the home screen is quick but has limited options. The device
setup menus provide access to the range and other programmable features. Both methods will be
described in the text to follow. The appendices at the end of this document contain quick reference
diagrams for each of the calibration changes described in this section.
Changing Calibration Values from the Home Screen
2-1
Figure 6 (left) shows the Home screen. The Radar range can be changed by selecting menu item
“4 PV LRV” or ”5 PV URV”. Selecting either menu item will cause the Communicator to display
the range calibration screen as shown in Figure 6 (right).
Figure 6 selecting menu item 4 or 5 from the home screen (left) causes the screen to change to the range
calibration screen (right).
2-2
Selecting menu item “1 PV URV” from the range calibration screen (Figure 6 right) will change
the display to an edit screen. The edit screen allows a distance to be entered for the URV as
shown in Figure 7.
Figure 7 shows the URV and LRV edit screens.
7
2-3
Be aware of the “unit of measure” shown next to the current URV and LRV (ft = feet) when
entering your desired distance. When you have entered the distance tap the “ENTER” button.
The change will not take effect until they are sent to the Radar. To send the changes to the
Radar tap the “SEND” button in Figure 8.
Figure 8 shows a warning screen that appears when calibration values are changed. The change must be sent to the
Radar using the SEND button before they take effect.
8
Using Device Setup to Change Calibration Values
2-4
Figure 9 (left) shows the Home screen. Range calibration and other programmable values can be
accessed by selecting “1 Device setup”. The Device setup screen is shown in Figure 9 (right).
Figure 9 after selecting menu 1 from the home screen (left) the “Device Setup” screen (right) will be displayed.
2-5
The “Basic setup” screen shown in Figure 10 (right) provides menus to change common
calibration values. To display the Basic setup screen select “3 Basic setup” from the device
setup screen.
Figure 10 shows the “Device setup” menus (left) and the “Basic setup” menus screen (right).
2-6
The basic setup screen provides menus to change HART descriptive tags, unit of measure, range
values and PV Damp.
9
Device Setup  Basic Setup  Range Values
2-7
To change the Radar range distance values from the Basic setup screen select menu “4 Range
values”. The “Range values” screen seen in Figure 11 (right) will be displayed. The range values
screen shows the range calibration values (menu items “1” and “2”) and the upper and lower
sensor limits (menu items ”4” and ”5”). As show in Figure 11, the Radar has a limit of 100 feet.
Figure 11 shows the menu item selection to get to the range values screen.
2-8
Selecting menu “1 PV URV” or “2 PV LRV” from the “Range values” screen in Figure 11 will bring
up the appropriate URV or LRV edit screen as shown in Figure 7.
Device Setup  Basic Setup  Unit of Measure
2-9
The Radar default unit of measure is feet. The unit of measure can be change by selecting menu
“3 PV Units” from the Basic setup as shown in Figure 12. The Radar supports feet (ft), inches
(in), meters (m) and centimeters (cm). Scroll up or down to find the desired unit of measure. Tap
on the unit of measure and then tap ENTER.
Figure 12 shows the unit of measure screen. The unit of measure can be changed to feet (ft), inches (in), meters
(m) or centimeters (cm).
10
Device Setup  Basic Setup  Damping
2-10 Process variable measurement is averaged using a damping factor known as PV Damp. Radar units
are shipped with a PV Damp default value of 5. The PV Damp value can be changed from the Basic
setup screen menu ”7”. Figure 13 shows the PV Damp edit screen. It should be noted that
increasing PV Damp will slow down the Radar response.
Figure 13 shows the URV edit screen.
Device Setup  Diag/Service  4mA and 20mA Calibration
2-11 The 4mA and 20mA distance values can be manually keyed in using the URV and LRV edit screens
shown in Figure 7. To manually enter a distance value, refer to steps 2-1, 2-7 or 2-12. An
alternative method is to set the 4mA or 20mA distance to the current distance being measure by
the Radar. For example, the current measured distance could represent the top or bottom of a
tank or the desired full or empty point. Setting the 4/20mA distance can be done using the
Calibration menu found in the “Diag/Service” screen. Figure 14 shows the menu selection to get
to the “Diag/Service” Screen.
Figure 14 shows the menu path to Diag/Service screen.
11
2-12 From the Diag/Service (Figure 15 left) select menu “3 Calibration” to display the Calibration
screen. From the Calibration screen (Figure 15 right) you have the choice of manually entering
distance values or using the measured distance. To manually enter the distance, select menu
“2 Enter values”. You will be prompted to select 4mA or 20mA (Figure 16) before the edit screen
is displayed.
Figure 15 shows the Calibration menu (right)
Figure 16 shows the choices available when setting the 4mA and 20mA distance.
2-13 To set the 4mA or 20mA value to the current distance select menu ”1 Apply values” from the
Calibration screen (Figure 15 right). Select the value you want to set (Figure 17 left). In the
following example the 4mA distance value will be set. The process for setting the 20mA distance is
the same. Figure 17 (right) shows the resulting screen when the 4mA value is selected. Tapping
“OK” will show the screen in Figure 18.
12
Figure 17 shows the URV edit screen.
Figure 18 shows the URV edit screen.
2-14 The measured distance is displayed in the top section of Figure 18. To use this distance select
menu “1 Set as 4mA value”. If the distance is incorrect adjust the target or wait for the target
distance to reach the desired value and then select menu “2 Read new value”. Menu ”2” will read
the new distance from the Radar. Note that setting the 4mA distance will cause the loop current
to change to 4mA.
13
Warnings Screens
2-15 Changing calibration values in the Radar may affect the loop current. Warning screens like those
shown in Figure 19 may appear. Tap the “OK” to proceed with the calibration change. After a
calibration value has been changed on the 475 Communicator the changes must be sent to the
Radar unit to take effect. Figure 20 shows the warning screen displayed after the change.
Tapping “SEND” will write the new value in the Radar. Tapping “ABORT” will cancel the write
operation.
Figure 19 shows 2 examples of warning screens.
Figure 20 shows a warning screen that appears when calibration values are changed. The change must be sent to
the Radar using the SEND button before they take effect.
14
Non-zero Status Screens
2-16 When a calibration value is changed in the Radar a configuration change flag bit is set in the
resulting HART status code. The 475 Communicator will detect the flag and display a non-zero
status code screen as shown in Figure 21. The screen is a confirmation that the Radar
configuration has changed. The flag will remain set in all status codes sent to the 475
Communicator until the 475 Communicator tells the Radar to clear the flag. Non-zero status
codes can be ignored by tapping “YES”.
Figure 21 shows the URV edit screen.
15
Section 3: Reviewing Calibration Settings
2-17 The 475 Communicator provides a set of menus to review the Radar calibration settings. From
the “Device setup” screen select menu “5 Review” (Figure 22).
Figure 22 shows the Review menu item highlighted.
2-18 The “Review” screen, Figure 23 provides a scrollable list of calibration values.
Figure 23 shows the Review screen.
16
Appendix A: Quick Reference – Short Cut to Range Values
Figure 24 shows the menu selections to change the URV and LRV.
Appendix B: Quick Reference – Menu Path to Common Calibration Values
Figure 25 shows the menu path to commonly used calibration values.
Appendix C: Quick Reference – Menu Path to 4mA and 20mA Calibration
Figure 26 shows the menu path to 4mA and 20mA calibration. The lower half of the diagram illustrates setting the 4mA value to the measured distance.
19