Ronan X96S DENSITY GAGE Manuel d'utilisateur Page 6
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Density Gage Manual 012407
2
Basic Concepts
Communications
The Ronan X96S Density gage provides both 4-20 mA current loop and HART communications.
4-20 MA
For many years, the field communication standard for process automation equipment has been a 4-20 mA current loop signal. The
current varies in proportion to the process variable being represented. In typical applications, a signal of 4mA will correspond to
the lower limit (0%) of the calibrated range and 20mA will correspond to the upper limit (100%) of the calibrated range. Thus, if
the system is calibrated for 1 to 3 SGU, then an analog current of 12mA (50% of range) will correspond to a density of 2 SGU.
HART
HART Field Communications Protocol extends the 4-20mA current loop standard to enhance communication with smart field
instruments. The HART protocol was designed specifically for use with intelligent measurement and control instruments, which
traditionally communicate using 4-20mA analog signals. HART preserves the 4-20mA signal and enables two-way digital
communications to occur without disturbing the integrity of the 4-20mA signal. Unlike other digital communication technologies,
the HART protocol maintains compatibility with existing 4-20mA systems, and in doing so, provides users with a backward
compatible solution. HART Communication Protocol is well established as the "de facto" industry standard for digitally enhanced
4-20mA-field communication.
The enhanced communications capability of intelligent field instruments employing the HART protocol, offers significantly
greater functionality and improved performance over traditional 4-20mA analog devices. The HART protocol permits the process
variable to continue to be transmitted by the 4-20mA analog signal and additional information pertaining to other variable,
parameters, device configuration, calibration, and device diagnostics to be transmitted digitally at the same time. Thus, a wealth of
additional information related to plant operation is available to central control or monitoring systems through HART
communications.
Variables
There are two types of variables, communications variables and device variables.
Communications Variables
HART defines four device variables, PV (Primary Variable), SV (Secondary Variable), TV, and QV. PV is assigned to the primary
4-20 ma loop. HART is also communicated over this loop. SV is assigned to an optional secondary 4-20 mA loop.
Device Variables
The Ronan X96S Density gage has 5 device variables:
Device Variable Value
D1 Density
D2 Density in alternate units
Proc Temp Process Temperature
Pressure Process Pressure
Head Temp Head Temperature
- DENSITY GAGE 1
- Table of Contents 2
- Density Gage Manual 012407 3
- Overview 5
- Basic Concepts 6
- Theory of Radiation Gaging 7
- Principles of Operation 7
- Menus/Operation 10
- [enable/disable] 11
- [Relay 1-4/TTL 1-4] Relay 1 14
- Root Menu 16
- Status Display Menu 17
- Configuration Menu 17
- Operation Menu 18
- Filtering Menu 18
- Empty Clamp Menu 19
- Detector Fault Menu 19
- Linearization Menu 19
- Temp Comp Menu 20
- Pressure Comp Menu 20
- D1 Config Menu 21
- % Solids Variables Menu 22
- % Acids Variables Menu 22
- Algorithm Menu 22
- D2 Config Menu 22
- Proc Temp Config Menu 23
- Pressure Config Menu 24
- Head Temp Config Menu 24
- Hardware Menu 25
- Source Type Menu 26
- Usr Def Source Menu 26
- Analog Out Config 26
- HART Output Menu 27
- Com1 Protocol Menu 27
- HART Menu 27
- System Menu 27
- Digital Outputs Menu 28
- Digital Inputs Menu 29
- Calibration Menu 30
- Loop Config Menu 31
- Aux Loop Cfg Menu 31
- Calibrate Menu 32
- Pressure Reference Menu 33
- Auto Reference Menu 33
- Diagnostics 33
- X96S Local Display 34
- Editing Values 35
- Installation 36
- ------- WARNING 37
- Safety Precautions 38
- Mechanical Mounting 39
- LOCAL CODE 40
- NATIONAL CODE 40
- Microprocessor Verification 41
- Power-up 42
- Password 43
- – Calibrating Density 44
- Step 2 Password Menu 45
- F1 F2 F3 F4 46
- Ronan Engineering 47
- Calibration 49
- Calibration Constant 50
- Calibration Curve 50
- Preparation for Calibration 51
- Temperature Compensation 52
- Documentation 53
- Configuration 54
- Detector 55
- ION Chamber 57
- Removing the Detector 60
- Amplifier Circuit Board 60
- (CBAY-6102) 60
- Replacing the Detector 61
- Circuit Board/Connector 61
- Assembly 61
- Electronics 62
- PART NUMBER DESCRIPTION 64
- SPECIFICATIONS 65
- SERIES X96S-N4 66
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