Instruction Manual

245364-V May 2002

Model 755A

20K

1X

100K5X

 

Front

 

 

Panel

 

 

TEST

20K

1

 

 

 

 

2

 

 

3

 

 

4

 

+REF

 

 

 

17.8K

 

Continuously

 

 

Variable

 

 

Recorder

75K

 

Zero

 

 

Suppression

20K

 

(0% to 25%

25K

 

Oxygen)

 

 

 

-REF

80%

 

Recorder

 

8.33K

 

 

Zero

60%

 

Suppression

 

 

25K

(Jumper

40%

Selectable)

 

 

 

25K

 

20%

25K

200K

1M

2M

-

+

10X

Amplifier Gain

 

 

(Jumper Selectable)

20X

 

 

 

50X

 

 

20K

 

 

 

100X

 

 

 

 

 

 

.1uF

.1uF

 

 

 

U13

R50A

-

 

 

U16

 

20K

+

 

 

 

 

 

10

Resistor Values are in Ohms.

To Alarm and V/I

5V

To Recorder

1V

100mV

Recorder Output (Jumper Selectable)

10mV

Figure 5-10. Simplified Analog Output Circuit for Recorder (Showing Three Ranges)

5-14

Circuit Analysis

Rosemount Analytical Inc. A Division of Emerson Process Management