
3.4.3
Read O
2
concentration
Once the cell is up to operating temperature, you can read O
2
percentage.
1. Access TP5 and TP6 next to the membrane keypad. Attach a multimeter across TP6
and TP6. You can now monitor the calibration and process gases. Press
INC
or
DEC
once to switch the output from process gas to calibration gas. Press
INC
or
DEC
a
second time to increase or decrease the calibration gas parameter. If the keys have
been inactive for one minute, the output reverts to the process gas. When you have
initiated a calibration, the value at TP5 and TP6 is the %O
2
seen by the cell. Oxygen
levels, as seen on the multimeter are:
•
8.0% O
2
= 8.0 Vdc
•
0.4% O
2
= 0.4 Vdc
2. HART
®
/AMS
WARNING
The HART option is not protected by energy limiting barriers.
Do not interface with HART from within the hazardous area.
Route the 4-20 mA cables and make the connections outside the hazardous
area.
This is the case even when using the intrinsically safe version of the handheld
communicator.
3. Rosemount
™
751: the loop driven LCD display
3.5
Logic I/O
You can configure the two-terminal logic contact either as a solid-state relay-activated
alarm or as a bi-directional calibration handshake signal to a Rosemount
™
IMPS 4000 or
SPS 4001B.
The configuration of this signal depends on the setting of the Logic I/O PIN MODE via
HART
®
/AMS or LOI. The ten different modes available are explained in
.
3.5.1
Alarm
When configured as an alarm, this signal alerts you to an out-of-spec condition. The
output is +5 Vdc in series with a 340 ohm resistor.
For optimum performance, Emerson recommends connecting the output to a Potter &
Brumfield 3.2 mA DC relay (PN R105-E1Y1-J1.OK).
Of the 10 modes in
, modes 0 through 7 are the alarm modes. The factory default
is mode 5 for a Rosemount
™
Oxymitter 4000 without a Rosemount IMPS 4000 or SPS
4001B. In this mode, the output will signal when a unit alarm or a
CALIBRATION
RECOMMENDED
indication occurs.
Reference Manual
Configure transmitter with membrane keypad
00809-0100-4340
October 2019
Rosemount Oxymitter 4000
73
Summary of Contents for Rosemount Oxymitter 4000
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Page 110: ...HART AMS Reference Manual October 2019 00809 0100 4340 110 Emerson com Rosemount ...
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Page 184: ...Optional accessories Reference Manual October 2019 00809 0100 4340 184 Emerson com Rosemount ...