Output Ranging; Default Settings - Emerson Rosemount Analytical HART 5081-A-HT Instruction Manual

MODEL 5081-A
a. reference offset
b. diagnostics
(1) glass impedance temperature
correction
(2) glass impedance high
(3) glass impedance low
5. Calibration settings
a. automatic buffer calibration
b. buffer selection list
c. stabilization criteria
(1) time
(2) change
H. Pressure settings (oxygen only)
a. units
b. pressure for % sat calculations

7.3 OUTPUT RANGING

7.3.1 Purpose
This section describes how to do the following:
1. assign values to the 4 and 20 mA outputs
2. set the output current generated during hold
3. set the output current generated when a fault is detected
4. control the amount of dampening on the output signal
5. generate a test current.
7.3.2 Definitions
1. CURRENT OUTPUTS. The transmitter provides a continuous 4 - 20 mA output directly proportional to the concentra-
tion of the analyte. The analyte is the substance being determined (oxygen, chlorine, or ozone).
2. HOLD. During calibration and maintenance the transmitter output may be outside the normal operating range. Placing
the transmitter on hold prevents false alarms or the unwanted operation of chemical dosing pumps. The transmitter
output can be programmed to remain at the last value or to generate any current between 3.80 and 22.00 mA. During
hold, the transmitter displays the present concentration and temperature. The word HOLD appears in the display.
3. FAULT. A fault is a system disabling condition. When the transmitter detects a fault, the following happens:
a. The display flashes.
b. The words FAULT and HOLD appear in the main display.
c. A fault or diagnostic message appears in the display.
d. The output signal remains at the present value or goes to the programmed fault value. Permitted values
are between 3.80 and 22.00 mA.
e. If the transmitter is in HOLD when the fault occurs, the output remains at the programmed hold value. To alert the
user that a fault exists, the word FAULT appears in the main display, and the display flashes. A fault or diagnostic
message also appears.
f. If the transmitter is simulating an output current when the fault occurs, the transmitter continues to generate the sim-
ulated current. To alert the user that a fault exists, the word FAULT appears in the display, and the display flashes.
4. DAMPEN. Output dampening smooths out noisy readings. But it also increases the response time of the output. To
estimate the time (in minutes) required for the output to reach 95% of the final reading following a step change, divide
the setting by 20. Thus, a setting of 140 means that, following a step change, the output takes about seven minutes
to reach 95% of final reading. The output dampen setting does not affect the response time of the process display. The
maximum setting is 255.
5. TEST. The transmitter can be programmed to generate a test current.
TABLE 7-1. Default Settings (continued)
rOFFSEt
diAG
IMPtC
GFH
GFL
PH CAL
bAUtO
buFFEr
StAbiLiSE
tiME
dELtA
BAr PrESS
Unit
% SAt P
0 to 999
on or off
on or off
0 to 2000 MW
0 to 900 MW
on or off
see table in Section 13.1
0 to 99 sec
0.02 to 0.50
mm hg, kPa, atm, bar, in Hg
0 to 9999
SECTION 7.0
PROGRAMMING
60
off
on
1000 MW
10 MW
standard
10 sec
0.02
mm Hg
760 mm Hg
35