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Instruction Manual
IM-106-340, Rev. 4.0
May 2006
3-5
Oxymitter 4000
When a calibration has been initiated, 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.
3. Model 751. The loop-driven LCD display.
LOGIC I/O This two-terminal logic contact can be configured either as a solid-state
relay-activated alarm or as a bi-directional calibration handshake signal to an
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 Table 3-1.
Table 3-1. Logic I/O
Configuration (as set at
HART/AMS or LOI)
*The default condition for an Oxymitter 4000 without an IMPS 4000 or SPS 4001B.
**The default condition for an Oxymitter 4000 with an IMPS 4000 or SPS 4001B.
Alarm
When configured as an alarm, this signal alerts you to an out-of-spec
condition. The output is 5 V in series with a 340 ohm resistor. For optimum
performance, Emerson Process Management recommends connecting the
output to a Potter & Brumfield 3.2 mA DC relay (P/N R10S-E1Y1-J1.0K).
Of the ten modes in Table 3-1, mode 1 through mode 7 are the alarm modes.
The factory default is mode 5 for Oxymitter 4000 units without an IMPS 4000
or SPS 4001B. In this mode, the output will signal when a unit alarm or a
CALIBRATION RECOMMENDED indication occurs.
Mode Configuration
0 The unit is not configured for any alarm condition.
1 The unit is configured for a Unit Alarm.
2 The unit is configured for Low O
2
.
3 The unit is configured for both a Unit Alarm and Low O
2
.
4 The unit is configured for a High AC Impedance/CALIBRATION
RECOMMENDED.
5* The unit is configured for both a Unit Alarm and a High AC
Impedance/CALIBRATION RECOMMENDED.
6 The unit is configured for both a Low O
2
and High AC Impedance/CALIBRATION
RECOMMENDED.
7 The unit is configured for a Unit Alarm, a Low O
2
, and a High AC
Impedance/CALIBRATION RECOMMENDED.
8** The unit is configured for a calibration handshake with IMPS 4000 or SPS 4001B.
CALIBRATION RECOMMENDED will initiate the calibration cycle.
9 The unit is configured for a calibration handshake. CALIBRATION
RECOMMENDED will not initiate the calibration cycle with the IMPS 4000 or
SPS 4001B.