Calibration Instruction Manual Emerson 475 Field Communicator Manual Revision FC.
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.
Contents ABM 2 Wire Radar with HART ....................................................................................................................... 2 Introduction .................................................................................................................................................. 4 Section 1: Getting Started .............................................................................................................................
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.
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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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.
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.
