Rosemount 755, Instruction Manual

Page: 43 / 94

S
TARTUP
3-3
748183-H
Rosemount Analytical
November 1997
ADJUSTMENT FUNCTION
1. RECORDER OUTPUT (S
ELECTOR
P
LUG
)
Provides selectable output of 10 mV 100 mV, 1 V, or 5 V for a voltage recorder.
2. M
ETER ADJUSTMENT
(R38)
Used to set meter to agree with recorder.
3. A
MPLIFIER
AR3 Z
ERO ADJUSTMENT
(R89)
Used for initial factory zeroing of amplifier AR3. (With slider of front-panel SPAN
potentiometer R4 connected to ground, R89 is adjusted for zero.)
4. A
MPLIFIER
AR4 Z
ERO
A
DJUSTMENT
(R90)
Used for initial factory zeroing of amplifier AR4. (With R10 connected to ground,
R90 is adjusted for zero.)
5. R
ESPONSE TIME ADJUSTMENT
(R20)
Provides adjustment range of 5 to 25 seconds for electronic response time (0 to
90% of fullscale). Clockwise adjustment decreases response time.
6.
7. +5 VDC
FULLSCALE OUTPUT ADJUSTMENT
(R33)
Used to set fullscale for basic analyzer output at +5 VDC.
8. Z
ERO SUPPRESSION ADJUSTMENT
(R45)
Used to set appropriate zero offset for suppressed-zero ranges.
9. D
ETECTOR
C
OARSE
Z
ERO
A
DJUSTMENT
(R92)
Provides coarse adjustment of detector zero by shifting the position of the detector
within the magnetic field. It is adjusted during factory checkout, and does not
require readjustment except after replacement of detector.
10. C
URRENT OUTPUT ZERO ADJUSTMENT
(R1)
Used to set zero-level current output, i.e., 4 mA for 4 to 20 mA board, 0 mA for 0 to
20 mA board, or 10 mA for 10 to 50 mA board.
11. C
URRENT OUTPUT SPAN ADJUSTMENT
(R2)
Used to set fullscale current output at 20 mA for 4 to 20 or 0 to 20 mA board, or at
50 mA for 10 to 50 mA board.
12. ALARM 2
CALIBRATION ADJUSTMENT
(R67)
Used for initial calibration of ALARM 2 circuit.
13. ALARM 2
SET
-
POINT ADJUSTMENT
(R68)
Provides continuously variable adjustment of setpoint for ALARM 2 circuit on
optional alarm accessory, for actuation of external, customer-supplied alarm and/or
control device(s). Adjustment range is 0 to 100% of fullscale span.
14. ALARM 2 D
EADBAND
A
DJUSTMENT
(R78)
Permits adjusting deadband of ALARM 2 circuit from 1% of fullscale
(counterclockwise limit) to 20% of fullscale (clockwise limit). Deadband is
essentially symmetrical with respect to setpoint.
15. ALARM 1 C
ALIBRATION
A
DJUSTMENT
(R63)
16. ALARM 1 S
ETPOINT
A
DJUSTMENT
(R64)
17. ALARM 1 D
EADBAND
A
DJUSTMENT
(R73)
Functions identical to the corresponding adjustment for ALARM 2 circuit.
T
ABLE
3-1. C
ONTROL
B
OARD
- A
DJUSTMENT
F
UNCTIONS