Emerson Oxymitter 4000 Instruction Manual download pdf (Page 79)

Instruction Manual

IM-106-340C, Rev. 4.4

July 2008

Hazardous Area Oxymitter 4000

http://www.raihome.com

Section 7 HART/AMS

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-1

HART Communicator Signal Line Connections . . . . . . . page 7-2

HART Communicator PC Connections . . . . . . . . . . . . . . . page 7-4

Off-Line and On-Line Operations . . . . . . . . . . . . . . . . . . . page 7-4

Logic I/O Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-5

HART/AMS Menu Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-5

HART Communicator O

Cal Method . . . . . . . . . . . . . . . . page 7-9

Defining a Timed Calibration via HART . . . . . . . . . . . . . . page 7-10

D/A Trim Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-11

OVERVIEW

The HART Communicator is a handheld communications interface device. It

provides a common communications link to all microprocessor-based

instruments 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 Hazardous Area Oxymitter 4000, the HART

Communicator requires a termination 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

keying (FSK) technique. With the use of FSK, high-frequency digital

communication signals are superimposed on the Hazardous Area 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

Communicator to a PC, an interface adapter is required. Refer to the proper

HART Communicator documentation in regard to the PC interface option.

The HART option is not protected by energy limiting barriers. It must not be interfaced from

within the hazardous area. The 4-20 mA cables should be routed and the connections made

outside the hazardous area. Note that this is the case even when using the intrinsically safe

version of the handheld communicator

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 183 184

No comments

Emerson Oxymitter 4000 Instruction Manual Page 79