Model 755R

Instruction Manual

748213-S April 2002

c.Potentiometric Output

1.Insert RECORDER OUTPUT Selector Plug (See Figure 3-1) in position ap- propriate to the desired output: 10 mV, 100 mV, 1V or 5V.

2.Connect leads of shielded recorder cable to “REC OUT +” and “-” termi- nals on the I/O board.

3.Connect the output cable to the appro- priate terminals of the recorder or other potentiometric device:

a.For device with span of 0 to 10 mV, 0 to 100 mV, 0 to 1V, or 0 to 5V, connect cable directly to input terminals of the device, ensuring correct polarity and range selec- tion.

b.For a device with intermediate span (i.e., between the specified values), connect the cable to the device via a suitable external voltage divider (See Figure 2-3, page 2-6).

d.Isolated Current Output (Optional)

1.Verify that the optional current output board appropriate to desired output is properly in place in its connector. See Figure 3-1, page 3-3. If originally or- dered with the analyzer, the board is factory installed.

2.On I/O board, connect leads of shielded recorder cable to “CUR- RENT OUT+” and “-” terminals.

3.Connect free end of output cable to input terminals of recorder or other current-actuated device, making sure that polarity is correct. If two or more current-actuated devices are to be used, they must be connected in se- ries (See Figure 2-4 below). Do not exceed the maximum load resistance of 1000 ohms.

Current and voltage outputs may be utilized simultaneously if desired.

mA +

-

755R

+

-

Recorder

Analyzer

Note: Total series resistance of all devices is not to exceed 1000 ohms.

+Controller

-

+Remote - Indicator

Figure 2-4. Model 755R Connected to Drive Several Current-Actuated Output Devices

Rosemount Analytical Inc. A Division of Emerson Process Management

Installation

2-7