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Instruction Manual
IM-106-340, Rev. 4.0
May 2006
Oxymitter 4000
http://www.processanalytic.com
Section 7 HART/AMS
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-1
HART Communicator Signal Line Connections . . . . . . . page 7-2
HART Communicator PC Connections . . . . . . . . . . . . . . . page 7-2
Off-Line and On-Line Operations . . . . . . . . . . . . . . . . . . . page 7-4
Logic I/O Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-4
HART/AMS Menu Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-4
HART Communicator O
2
Cal Method . . . . . . . . . . . . . . . . page 7-8
Defining a Timed Calibration via HART . . . . . . . . . . . . . . page 7-9
D/A Trim Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-9
OVERVIEW The HART Communicator is a handheld communications interface device. It
provides a common communications link to all microprocessor-based instru-
ments that are HART compatible. The handheld communicator contains an
8 x 21 character liquid crystal display (LCD) and 25 keys. A pocket-sized
manual, included with the HART Communicator, details the specific functions
of all the keys.
To interface with the Oxymitter 4000, the HART Communicator requires a ter-
mination point along the 4-20 mA current loop and a minimum load resistance
of 250 ohms between the communicator and the power supply.
The HART Communicator accomplishes its task using a frequency shift key-
ing (FSK) technique. With the use of FSK, high-frequency digital communica-
tion signals are superimposed on the Oxymitter 4000's 4-20 mA current loop.
The HART communicator does not disturb the 4-20 mA signal, since no net
energy is added to the loop.
The HART Communicator may be interfaced with a personal computer (PC),
providing that special software has been installed. To connect the HART Com-
municator to a PC, an interface adapter is required. Refer to the proper HART
Communicator documentation in regard to the PC interface option.